{"title":"Proposed innovation reform model for the mineral nitrogen fertilizer industry in China to reduce greenhouse gas emissions","authors":"","doi":"10.15302/j-fase-2022468","DOIUrl":"https://doi.org/10.15302/j-fase-2022468","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67328677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuanhang ZHAN, Jun ZHU, Yiting XIAO, Leland C. SCHRADER
{"title":"ALKALINE PRETREATMENT AND AIR MIXING FOR IMPROVEMENT OF METHANE PRODUCTION FROM ANAEROBIC CO-DIGESTION OF POULTRY LITTER WITH WHEAT STRAW","authors":"Yuanhang ZHAN, Jun ZHU, Yiting XIAO, Leland C. SCHRADER","doi":"10.15302/j-fase-2023506","DOIUrl":"https://doi.org/10.15302/j-fase-2023506","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135401067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"CRITICAL PROCESSES AND MAJOR FACTORS THAT DRIVE NITROGEN TRANSPORT FROM FARMLAND TO SURFACE WATER BODIES","authors":"","doi":"10.15302/j-fase-2023518","DOIUrl":"https://doi.org/10.15302/j-fase-2023518","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"230 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135402018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A DECADE REVIEW OF FASE","authors":"Jianxiang Xu","doi":"10.15302/j-fase-2023481","DOIUrl":"https://doi.org/10.15302/j-fase-2023481","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"102 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67329425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"ENVIRONMENTAL ATTITUDES AND CONSUMER PREFERENCE FOR ENVIRONMENTALLY-FRIENDLY BEVERAGE PACKAGING: THE ROLE OF INFORMATION PROVISION AND IDENTITY LABELING IN INFLUENCING CONSUMER BEHAVIOR","authors":"","doi":"10.15302/j-fase-2022478","DOIUrl":"https://doi.org/10.15302/j-fase-2022478","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67329679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"ORGANIC CARBON STOCKS IN A SILTY TEXTURED SOIL FOLLOWING REINTEGRATION OF A 20 YEARS OLD <I>MISCANTHUS</I> × <I>GIGANTEUS</I> SITE INTO A CROP ROTATION","authors":"","doi":"10.15302/j-fase-2023485","DOIUrl":"https://doi.org/10.15302/j-fase-2023485","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67330002","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"China's Agriculture Green Development: from Concept to Actions","authors":"","doi":"10.15302/j-fase-2023512","DOIUrl":"https://doi.org/10.15302/j-fase-2023512","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67331065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"DEGRADATION OF ORGANIC POLLUTANTS IN FLOCCULATED LIQUID DIGESTATE USING PHOTOCATALYTIC TITANATE NANOFIBERS: MECHANISM AND RESPONSE SURFACE OPTIMIZATION","authors":"","doi":"10.15302/j-fase-2023503","DOIUrl":"https://doi.org/10.15302/j-fase-2023503","url":null,"abstract":"","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67331098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
● Content of heavy metals in hydrochar varies considerably, from 50% to 100%. ● Concentrations of heavy metals in hydrochar can be higher than those in the dairy manure. ● Concentrations of heavy metals in hydrochar are far below the regulatory level. Hydrochar produced from dairy manure is a regulated biosolid if being promoted for agricultural applications thus must have the properties that comply with all environmental standards and government regulations, including the levels of heavy metals (HMs). In this study, systematic research was conducted on HM levels in hydrochar from dairy manure and on the effects of processing conditions, including processing temperature (180–255 °C), holding time (30–120 min) and solid content of manure slurry (2%–15%), through a central composite design and statistical analyses. It was found that HMs can be retained in hydrochar, ranging from 40% to 100%. The processing temperature and solid content in the feed were the most influential process parameters that affected HMs retention in hydrochar. Statistical analysis showed that there was no single optimal point to minimize HMs retained in hydrochar, but there were minimization points at given processing time and solid content. Most HMs concentrations were higher in hydrochar than those initially in dairy manure but were greatly below the thresholds as set by the US government regulations. Thus, hydrochar is feasible for use as a phosphorus-enriched organic fertilizer and/or soil amendment for agricultural applications without serious concerns about HMs it might contain.
{"title":"ASSESSMENT OF HEAVY METALS IN HYDROCHAR PRODUCED BY HYDROTHERMAL CARBONIZATION OF DAIRY MANURE","authors":"B. Brian HE, Zheting BI, Lide CHEN","doi":"10.15302/j-fase-2023507","DOIUrl":"https://doi.org/10.15302/j-fase-2023507","url":null,"abstract":"<List> <ListItem><ItemContent> ● Content of heavy metals in hydrochar varies considerably, from 50% to 100%. </ItemContent></ListItem> <ListItem><ItemContent> ● Concentrations of heavy metals in hydrochar can be higher than those in the dairy manure. </ItemContent></ListItem> <ListItem><ItemContent> ● Concentrations of heavy metals in hydrochar are far below the regulatory level. </ItemContent></ListItem></List> Hydrochar produced from dairy manure is a regulated biosolid if being promoted for agricultural applications thus must have the properties that comply with all environmental standards and government regulations, including the levels of heavy metals (HMs). In this study, systematic research was conducted on HM levels in hydrochar from dairy manure and on the effects of processing conditions, including processing temperature (180–255 °C), holding time (30<i>–</i>120 min) and solid content of manure slurry (2%<i>–</i>15%), through a central composite design and statistical analyses. It was found that HMs can be retained in hydrochar, ranging from 40% to 100%. The processing temperature and solid content in the feed were the most influential process parameters that affected HMs retention in hydrochar. Statistical analysis showed that there was no single optimal point to minimize HMs retained in hydrochar, but there were minimization points at given processing time and solid content. Most HMs concentrations were higher in hydrochar than those initially in dairy manure but were greatly below the thresholds as set by the US government regulations. Thus, hydrochar is feasible for use as a phosphorus-enriched organic fertilizer and/or soil amendment for agricultural applications without serious concerns about HMs it might contain.","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhengxin FEI, Zijie DING, Xuan ZHENG, Liang FENG, Qingyao HE, Shuiping YAN, Long JI
● LFD was treated by fly ash-based chemical precipitation and CO2 mineralization. ● > 93% COD and > 98% TP removal efficiency, and < 2 mS·cm−1 EC was achieved. ● COD and TP removal was achieved by co-precipitation during CO2 mineralization. ● CO2 mineralization neutralized the alkaline LFD and removed heavy met. Chemical precipitation is a widely applied approach for a liquid fraction of digestate (LFD) of agricultural waste but its large-scale application requires low-cost and efficient precipitating agents and novel process design. This study evaluated novel approach for the efficient removal of contaminants from the LFD using fly ash-based chemical precipitation, followed by filtration and CO2 mineralization. The technical feasibility of this approach was evaluated using pH and electrical conductivity (EC), and removal efficiencies of total phosphorus (TP), chemical oxygen demand (COD) and heavy metals during the treatment. The fly ash used in this study showed a promising performance as a chemical precipitation agent for COD and TP removal from the treated LFD involving complex effects of precipitation and adsorption. CO2 bubbling after fly ash-based chemical precipitation provided further COD and TP removal by carbonation reactions between CO2 and the excessive alkaline minerals in fly ash. Although addition of fly ash to untreated LFD increased pH from 8.3 to 12.9 and EC from 7.01 to 13.7 mS·cm−1, CO2 bubbling helped neutralize the treated LFD and reduce the EC, and concentrations of toxic ions by carbonation reactions. The fly ash-based chemical precipitation and CO2 mineralization had > 93% COD and > 98% TP removal efficiencies, and resulted in an EC of < 2 mS·cm−1 and a neutral pH in the treated LFD, as well as the high purity calcite product.
{"title":"EFFICIENT CONTAMINANT REMOVAL FROM LIQUID DIGESTATE OF PIG MANURE BY CHEMICAL PRECIPITATION AND CO$lt;inf$gt;2$lt;/inf$gt; MINERALIZATION USING ALKALINE ASH","authors":"Zhengxin FEI, Zijie DING, Xuan ZHENG, Liang FENG, Qingyao HE, Shuiping YAN, Long JI","doi":"10.15302/j-fase-2023480","DOIUrl":"https://doi.org/10.15302/j-fase-2023480","url":null,"abstract":"<List> <ListItem><ItemContent> ● LFD was treated by fly ash-based chemical precipitation and CO<sub>2</sub> mineralization. </ItemContent></ListItem> <ListItem><ItemContent> ● > 93% COD and > 98% TP removal efficiency, and < 2 mS·cm<sup>−1</sup> EC was achieved. </ItemContent></ListItem> <ListItem><ItemContent> ● COD and TP removal was achieved by co-precipitation during CO<sub>2</sub> mineralization. </ItemContent></ListItem> <ListItem><ItemContent> ● CO<sub>2</sub> mineralization neutralized the alkaline LFD and removed heavy met. </ItemContent></ListItem></List> Chemical precipitation is a widely applied approach for a liquid fraction of digestate (LFD) of agricultural waste but its large-scale application requires low-cost and efficient precipitating agents and novel process design. This study evaluated novel approach for the efficient removal of contaminants from the LFD using fly ash-based chemical precipitation, followed by filtration and CO<sub>2</sub> mineralization. The technical feasibility of this approach was evaluated using pH and electrical conductivity (EC), and removal efficiencies of total phosphorus (TP), chemical oxygen demand (COD) and heavy metals during the treatment. The fly ash used in this study showed a promising performance as a chemical precipitation agent for COD and TP removal from the treated LFD involving complex effects of precipitation and adsorption. CO<sub>2</sub> bubbling after fly ash-based chemical precipitation provided further COD and TP removal by carbonation reactions between CO<sub>2</sub> and the excessive alkaline minerals in fly ash. Although addition of fly ash to untreated LFD increased pH from 8.3 to 12.9 and EC from 7.01 to 13.7 mS·cm<sup>−1</sup>, CO<sub>2</sub> bubbling helped neutralize the treated LFD and reduce the EC, and concentrations of toxic ions by carbonation reactions. The fly ash-based chemical precipitation and CO<sub>2</sub> mineralization had > 93% COD and > 98% TP removal efficiencies, and resulted in an EC of < 2 mS·cm<sup>−1</sup> and a neutral pH in the treated LFD, as well as the high purity calcite product.","PeriodicalId":12565,"journal":{"name":"Frontiers of Agricultural Science and Engineering","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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