Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).71-76
L. T. Quyen, Nguyễn Thị Minh Thu, Le Thi Lan Phuong, N. Trang
: The objectives of this work were to accurately evaluate testing kits that analyse sperm DNA fragmentation in infertile men and to provide a comparison of an improved testing kit (SSSperm testing kit) to the existing Halosperm testing kit in an analysis of sperm DNA fragmentation. A cross-sectional study was conducted on 300 semen samples from infertile men with a sperm concentration ≥1 million/ml using the Bland-Altman, T-test, and Pearson test for statistical study. The SSSperm testing kit had a coefficient of variation of CV%=2.26%<5% and t tn =0.970.05). In conclusion, the SSSperm testing kit for the analysis of sperm DNA fragmentation is qualified as determined from quantitative tests, and the SSSperm testing kit is equivalent to the Halosperm testing kit.
{"title":"Comparison of the SSSperm testing kitwith the Halosperm testing kit in an analysis of sperm DNA fragmentation","authors":"L. T. Quyen, Nguyễn Thị Minh Thu, Le Thi Lan Phuong, N. Trang","doi":"10.31276/vjste.62(2).71-76","DOIUrl":"https://doi.org/10.31276/vjste.62(2).71-76","url":null,"abstract":": The objectives of this work were to accurately evaluate testing kits that analyse sperm DNA fragmentation in infertile men and to provide a comparison of an improved testing kit (SSSperm testing kit) to the existing Halosperm testing kit in an analysis of sperm DNA fragmentation. A cross-sectional study was conducted on 300 semen samples from infertile men with a sperm concentration ≥1 million/ml using the Bland-Altman, T-test, and Pearson test for statistical study. The SSSperm testing kit had a coefficient of variation of CV%=2.26%<5% and t tn =0.97<t c =2. The two methods have similar DNA fragmentation index (DFI) results (r=0.995; p<0.001). The difference between the results of the two kits was not statistically significant (p=0.236>0.05). In conclusion, the SSSperm testing kit for the analysis of sperm DNA fragmentation is qualified as determined from quantitative tests, and the SSSperm testing kit is equivalent to the Halosperm testing kit.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80509386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).48-55
Pham Huu Quynh Nhu, T. T. Uyen, P. Vuong, P. T. Thao
: Yeast biomass enriched with iron is used in a profound and safe treatment for anaemia. In this work, response surface methodology (RSM) was used to survey the response of culture conditions (temperature, degrees brix, time, and initial iron concentration) to the bioaccumulation of ferric ion (Fe 3+ ) in yeast ( Saccharomyces pastorianus ). On the other hand, the Box-Behnken design was used to determine the optimum conditions of 24 o C, 13 o Bx of the culture solid content for 49 h incubation and 656 ppm of initial iron concentration. The total Fe 3+ content in the biomass was significantly affected by the culture temperature and degrees brix (p<0.0001). Under optimum conditions, the maximum level of Fe (III) ions in the dry cell weight of S. pastorianus was 16.82±0.65 mg/g. The results from statistical analysis showed that the model was significant (p<0.0001) and adequate.
{"title":"Optimization of culture conditions of iron-enriched biomass of Saccharomyces pastorianus by response surface methodology","authors":"Pham Huu Quynh Nhu, T. T. Uyen, P. Vuong, P. T. Thao","doi":"10.31276/vjste.62(2).48-55","DOIUrl":"https://doi.org/10.31276/vjste.62(2).48-55","url":null,"abstract":": Yeast biomass enriched with iron is used in a profound and safe treatment for anaemia. In this work, response surface methodology (RSM) was used to survey the response of culture conditions (temperature, degrees brix, time, and initial iron concentration) to the bioaccumulation of ferric ion (Fe 3+ ) in yeast ( Saccharomyces pastorianus ). On the other hand, the Box-Behnken design was used to determine the optimum conditions of 24 o C, 13 o Bx of the culture solid content for 49 h incubation and 656 ppm of initial iron concentration. The total Fe 3+ content in the biomass was significantly affected by the culture temperature and degrees brix (p<0.0001). Under optimum conditions, the maximum level of Fe (III) ions in the dry cell weight of S. pastorianus was 16.82±0.65 mg/g. The results from statistical analysis showed that the model was significant (p<0.0001) and adequate.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88928128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luminance responsivity is a photometric quantity that realizes the brightness of a surface. Recently, a luminance responsivity scale has been presented [2, 3], which is based on a separate measurement of the spectral responsivity, as well as the distance and size of the aperture. The luminance responsivity value at the aperture plane of an integrating sphere is obtained from the measurements. In this work, we present our analysis of the unit of luminance responsivity.
{"title":"Research and development of a luminance responsivity standard system at the Vietnam Metrology Institute","authors":"Ngoc Dung Hoang, Photometry, X. Cao, Hoang Luong Nguyen","doi":"10.31276/vjste.62(2).03-06","DOIUrl":"https://doi.org/10.31276/vjste.62(2).03-06","url":null,"abstract":"Luminance responsivity is a photometric quantity that realizes the brightness of a surface. Recently, a luminance responsivity scale has been presented [2, 3], which is based on a separate measurement of the spectral responsivity, as well as the distance and size of the aperture. The luminance responsivity value at the aperture plane of an integrating sphere is obtained from the measurements. In this work, we present our analysis of the unit of luminance responsivity.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88027538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).12-18
H. Le, H. Nguyen, T. Vo, T. Nguyen, M. Michalak, T. H. Luu
: Lanthanum orthoferrite (LaFeO 3 ) photocatalysts were synthesized by a facile and cost-effective co-precipitation method via the hydrolysis of La (III) and Fe (III). The characteristics of LaFeO 3 were investigated through thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), vibrating sample magnetometry (VSM), and transmission electron microscopy (TEM). During the investigation of the applicability of LaFeO 3 as a photocatalyst for the atom transfer radical polymerization (ATRP) of methyl methacrylate monomer under UV irradiation, the obtained poly(methyl methacrylate) exhibited a high molecular weight and narrow polydispersity index. In addition, the LaFeO 3 can be recovered via application of a magnetic field and reused for the atom transfer radical polymerization process.
{"title":"Fabrication of perovskite lanthanum orthoferrite as a photocatalyst for controlled atom transfer radical polymerization of methacrylate monomers toward an electrolyte material for lead acid batteries","authors":"H. Le, H. Nguyen, T. Vo, T. Nguyen, M. Michalak, T. H. Luu","doi":"10.31276/vjste.62(2).12-18","DOIUrl":"https://doi.org/10.31276/vjste.62(2).12-18","url":null,"abstract":": Lanthanum orthoferrite (LaFeO 3 ) photocatalysts were synthesized by a facile and cost-effective co-precipitation method via the hydrolysis of La (III) and Fe (III). The characteristics of LaFeO 3 were investigated through thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), vibrating sample magnetometry (VSM), and transmission electron microscopy (TEM). During the investigation of the applicability of LaFeO 3 as a photocatalyst for the atom transfer radical polymerization (ATRP) of methyl methacrylate monomer under UV irradiation, the obtained poly(methyl methacrylate) exhibited a high molecular weight and narrow polydispersity index. In addition, the LaFeO 3 can be recovered via application of a magnetic field and reused for the atom transfer radical polymerization process.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"345 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77620375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).30-33
Ngoc Thuc Dinh, Xuan Luong Ngo, Huan Trinh Thi, H. N. Thi, Ha Mai Vu Thi, Ngoc Anh Mai Thi, Thi Kim Oanh Vu
: Rourea harmandiana Pierre is a species which belongs to the family of Connaraceae. This plant is found abundantly in central of Vietnam (Thua Thien - Hue, Da Nang). Chemical study on the ethyl acetate extract of Rourea harmandiana leaves has led to the isolation of four compounds including vomifoliol (1), boscialin (2), abscisic acid (3) and p -coumaric acid (4). The structures of these compounds have been identified by NMR, MS spectroscopic data and comparison with the reported literature. These compounds were isolated from Rourea harmandiana species as well as from the genus Rourea for the first time.
{"title":"Chemical constituents from ethyl acetate extract of the leaves of Rourea harmandiana Pierre","authors":"Ngoc Thuc Dinh, Xuan Luong Ngo, Huan Trinh Thi, H. N. Thi, Ha Mai Vu Thi, Ngoc Anh Mai Thi, Thi Kim Oanh Vu","doi":"10.31276/vjste.62(2).30-33","DOIUrl":"https://doi.org/10.31276/vjste.62(2).30-33","url":null,"abstract":": Rourea harmandiana Pierre is a species which belongs to the family of Connaraceae. This plant is found abundantly in central of Vietnam (Thua Thien - Hue, Da Nang). Chemical study on the ethyl acetate extract of Rourea harmandiana leaves has led to the isolation of four compounds including vomifoliol (1), boscialin (2), abscisic acid (3) and p -coumaric acid (4). The structures of these compounds have been identified by NMR, MS spectroscopic data and comparison with the reported literature. These compounds were isolated from Rourea harmandiana species as well as from the genus Rourea for the first time.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79873069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).19-23
H. Bui, L. Nguyen, X. T. Nguyen, Southern Education
For many years, anaerobic digestion has been widely applied to the treatment of wastewater with high biodegradable organic content like waste sludge, an organic fraction of solid waste, as well as to mixtures of wastewater and solid waste [1]. The anaerobic digestion process possesses advantages such as low sludge production, low energy consumption, and high potential recovery of biogases, which can be used for cooking and electricity. However, anaerobic effluent has a high ammonia concentration [1]. Further, ammonium is discharged into receiving bodies from various sources, namely fertilizer [2], landfill leachate [3], pig wastewater [4, 5], and especially in the effluent of an anaerobic co-digestion of a mixture of two or more solid wastes and wastewaters [6]. When discharged into receiving sources, ammonium causes eutrophication, dissolved oxygen depletion, and toxicity to aquatic organisms [7]. Additionally, the penetration of ammonia into ground water causes water contamination and is the cause of blue-skinned disease in children and pregnant women [7]. Because of the risks of untreated ammonia discharge, environmental regulations regarding the allowable limits of ammonia into receiving bodies are becoming more stringent across every country. In Vietnam, the maximum allowable limit of ammonium in drinking water is 3.0 mg/l [8].
{"title":"Removal of ammonia from anaerobic co-digestion effluent of organic fraction of food waste and domestic wastewater using air stripping process","authors":"H. Bui, L. Nguyen, X. T. Nguyen, Southern Education","doi":"10.31276/vjste.62(2).19-23","DOIUrl":"https://doi.org/10.31276/vjste.62(2).19-23","url":null,"abstract":"For many years, anaerobic digestion has been widely applied to the treatment of wastewater with high biodegradable organic content like waste sludge, an organic fraction of solid waste, as well as to mixtures of wastewater and solid waste [1]. The anaerobic digestion process possesses advantages such as low sludge production, low energy consumption, and high potential recovery of biogases, which can be used for cooking and electricity. However, anaerobic effluent has a high ammonia concentration [1]. Further, ammonium is discharged into receiving bodies from various sources, namely fertilizer [2], landfill leachate [3], pig wastewater [4, 5], and especially in the effluent of an anaerobic co-digestion of a mixture of two or more solid wastes and wastewaters [6]. When discharged into receiving sources, ammonium causes eutrophication, dissolved oxygen depletion, and toxicity to aquatic organisms [7]. Additionally, the penetration of ammonia into ground water causes water contamination and is the cause of blue-skinned disease in children and pregnant women [7]. Because of the risks of untreated ammonia discharge, environmental regulations regarding the allowable limits of ammonia into receiving bodies are becoming more stringent across every country. In Vietnam, the maximum allowable limit of ammonium in drinking water is 3.0 mg/l [8].","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78597582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-06-30DOI: 10.31276/vjste.62(2).07-11
H. Pham, J. Vasel
Manometric methods, also called respirometers, have been used for decades to measure the main parameters defining the organic pollution of wastewaters, such as BOD (biochemical oxygen demand) or CoDb (biodegradable chemical oxygen demand). In fact, BoD (or CoDb) are not compounds but properties of wastewater. For known compounds, the theoretical CoDb can be calculated. For example, with an aerobic system and tertiary compounds (C, o, H):
压力测量法，也称为呼吸计，几十年来一直用于测量定义废水有机污染的主要参数，如BOD(生化需氧量)或CoDb(可生物降解化学需氧量)。事实上，BoD(或CoDb)不是化合物，而是废水的性质。对于已知的化合物，可以计算出理论CoDb。例如，有氧系统和三级化合物(C, o, H):
{"title":"Simple systems to characterize wastewaters - the case of biomethane potential","authors":"H. Pham, J. Vasel","doi":"10.31276/vjste.62(2).07-11","DOIUrl":"https://doi.org/10.31276/vjste.62(2).07-11","url":null,"abstract":"Manometric methods, also called respirometers, have been used for decades to measure the main parameters defining the organic pollution of wastewaters, such as BOD (biochemical oxygen demand) or CoDb (biodegradable chemical oxygen demand). In fact, BoD (or CoDb) are not compounds but properties of wastewater. For known compounds, the theoretical CoDb can be calculated. For example, with an aerobic system and tertiary compounds (C, o, H):","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78000293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-25DOI: 10.31276/vjste.62(1).55-61
N. Thang, B. M. Cuong, D. N. Ha, D. Dung, S. Nair, M. Vinayan, Gajanan R Saykhedkar, R. Babu, D. T. Thao, T. Q. Dieu, Nguyen Chi Thanh, P. Zaidi
Vietnam is one of the countries most affected by climate change, with a number of serious droughts occurring in the 2015-2017 period. With around 80% of the cultivated area under rainfed condition, drought is considered the biggest challenge for maize production in Vietnam [2]. Therefore, the research and selection of drought-tolerant maize varieties that have high grain yield and the ability to adapt to climate change are of great interest to maize breeders. However, drought tolerance is a low-heritability trait that is regulated by multiple genes; it requires substantial money and time to accomplish these daunting research and selection tasks. Fortunately, genomic selection (GS) by means of mapping quantitative trait loci (QTL) relating to drought tolerance using molecular markers is an efficient and time-saving tool in plant breeding. It results in the achievement of greater breeding value through selection at the early stages of the improvement cycle [3]. Currently, using single nucleotide polymorphisms (SNPs) is becoming more common in plant breeding through marker-assisted selection and is replacing simple sequence repeats (SSRs) for crops, such as maize, whose genomes have been completely sequenced [4].
{"title":"Studies on applying SNP markers to breeding drought-tolerant maize hybrids","authors":"N. Thang, B. M. Cuong, D. N. Ha, D. Dung, S. Nair, M. Vinayan, Gajanan R Saykhedkar, R. Babu, D. T. Thao, T. Q. Dieu, Nguyen Chi Thanh, P. Zaidi","doi":"10.31276/vjste.62(1).55-61","DOIUrl":"https://doi.org/10.31276/vjste.62(1).55-61","url":null,"abstract":"Vietnam is one of the countries most affected by climate change, with a number of serious droughts occurring in the 2015-2017 period. With around 80% of the cultivated area under rainfed condition, drought is considered the biggest challenge for maize production in Vietnam [2]. Therefore, the research and selection of drought-tolerant maize varieties that have high grain yield and the ability to adapt to climate change are of great interest to maize breeders. However, drought tolerance is a low-heritability trait that is regulated by multiple genes; it requires substantial money and time to accomplish these daunting research and selection tasks. Fortunately, genomic selection (GS) by means of mapping quantitative trait loci (QTL) relating to drought tolerance using molecular markers is an efficient and time-saving tool in plant breeding. It results in the achievement of greater breeding value through selection at the early stages of the improvement cycle [3]. Currently, using single nucleotide polymorphisms (SNPs) is becoming more common in plant breeding through marker-assisted selection and is replacing simple sequence repeats (SSRs) for crops, such as maize, whose genomes have been completely sequenced [4].","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85902059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-03-25DOI: 10.31276/vjste.62(1).69-73
Minh-Tan Vo, V. Nguyen, Thi-My-Chi Vo, T. Bui, T. Dao
Recently, an increase in the concentration of trace metals (e.g. chromium, zinc, copper) in bodies of water such as rivers, lakes, and reservoirs caused by anthropogenic activities has been a concern. Although trace metals (e.g. Cu, Ni, Zn) at low concentrations are essential to the life and growth of organisms, at critical concentrations these metals have been demonstrated to cause harmful effects on the ecosystem and human health [1, 2].
{"title":"Responses of green algae and diatom upon exposure to chromium and cadmium","authors":"Minh-Tan Vo, V. Nguyen, Thi-My-Chi Vo, T. Bui, T. Dao","doi":"10.31276/vjste.62(1).69-73","DOIUrl":"https://doi.org/10.31276/vjste.62(1).69-73","url":null,"abstract":"Recently, an increase in the concentration of trace metals (e.g. chromium, zinc, copper) in bodies of water such as rivers, lakes, and reservoirs caused by anthropogenic activities has been a concern. Although trace metals (e.g. Cu, Ni, Zn) at low concentrations are essential to the life and growth of organisms, at critical concentrations these metals have been demonstrated to cause harmful effects on the ecosystem and human health [1, 2].","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79006062","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-12-16DOI: 10.31276/vjste.61(4).29-34
H. D. Thien, Dan Nguyen Phuoc, Thanh Bui Xuan, J. Soo
npdan@hcmut.edu.vn Abstract: A lab-scale flat sheet membrane bioreactor (MBR) system was used for the treatment of piggery wastewater to produce an effluent with the appropriate ratio of nitrite:ammonia (1:1 to 1:1.3) as a pre-treatment for the anammox process. The feed wastewater, which was the effluent of a biogas digester, contained 253 ± 49 (n=60) mg.l -1 as COD, 231 ± 18 mg.l -1 as N-ammonia, 223±19 mg.l -1 as total Kjeldalh nitrogen (TKN), alkalinity of 1433 ± 153 mg.l -1 as CaCO 3 , and pH=7.5 ± 0.3. This study aimed to determine the suitable hydraulic retention time (HRT) and alkalinity to yield the appropriate influent for the annamox process. The results showed that the suitable effluent of the partial nitrification with ratio of nitrite:ammonia 1.0:1.1 at HRT of 7h30, equivalent to total nitrogen loading of 0.77 kgNm -3 d -1 . The nitrite accumulation rate (NAR) was 82% at HRT of 7h30, whereas NAR were 11 and 63% at HRT of 12h30 and 8h45, respectively, due to the high growth of nitrite oxidation bacteria (NOB) at long HRTs. As increasing alkalinity of up to 1600 mg.l -1 and pH of 8.0 at HRT of 8h45, NAR was increased from 63 to 73%, ratio of ammonia:nitrite reduced from 1.0:1.8 to 1.0:1.6 and free ammonia concentration reached to 20.2 mg.l -1 nitrogen. This shows that the increase of alkalinity inhibited strongly
{"title":"Partial nitrification of piggery wastewater as pre-treatment for anammox process using flat sheet membrane bioreactor","authors":"H. D. Thien, Dan Nguyen Phuoc, Thanh Bui Xuan, J. Soo","doi":"10.31276/vjste.61(4).29-34","DOIUrl":"https://doi.org/10.31276/vjste.61(4).29-34","url":null,"abstract":"npdan@hcmut.edu.vn Abstract: A lab-scale flat sheet membrane bioreactor (MBR) system was used for the treatment of piggery wastewater to produce an effluent with the appropriate ratio of nitrite:ammonia (1:1 to 1:1.3) as a pre-treatment for the anammox process. The feed wastewater, which was the effluent of a biogas digester, contained 253 ± 49 (n=60) mg.l -1 as COD, 231 ± 18 mg.l -1 as N-ammonia, 223±19 mg.l -1 as total Kjeldalh nitrogen (TKN), alkalinity of 1433 ± 153 mg.l -1 as CaCO 3 , and pH=7.5 ± 0.3. This study aimed to determine the suitable hydraulic retention time (HRT) and alkalinity to yield the appropriate influent for the annamox process. The results showed that the suitable effluent of the partial nitrification with ratio of nitrite:ammonia 1.0:1.1 at HRT of 7h30, equivalent to total nitrogen loading of 0.77 kgNm -3 d -1 . The nitrite accumulation rate (NAR) was 82% at HRT of 7h30, whereas NAR were 11 and 63% at HRT of 12h30 and 8h45, respectively, due to the high growth of nitrite oxidation bacteria (NOB) at long HRTs. As increasing alkalinity of up to 1600 mg.l -1 and pH of 8.0 at HRT of 8h45, NAR was increased from 63 to 73%, ratio of ammonia:nitrite reduced from 1.0:1.8 to 1.0:1.6 and free ammonia concentration reached to 20.2 mg.l -1 nitrogen. This shows that the increase of alkalinity inhibited strongly","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88804809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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