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Sustainable Energy from Waste: A Feasibility Study in Miri, Malaysia 可持续废物能源:马来西亚美里的可行性研究
Pub Date : 2023-12-20 DOI: 10.53623/idwm.v3i2.349
Ming Xuan Chua, Nur Hasyimah Hashim, Musademba Downmore, Paran Gani
The growth of urban populations, industrialization, and economic development has led to a surge in solid waste production. When local recycling infrastructure falls short, much of this waste ends up in landfills, causing environmental and social challenges. This study aims to assess the feasibility of converting municipal solid waste (MSW) into energy, with a focus on combustion chamber modeling in Miri, Sarawak. Data on MSW composition are obtained from secondary sources. Ansys Fluent software is used to model the combustion chamber, and simulations are conducted to explore temperature, turbulence, and species distribution. MSW composition illustrates higher substantial fractions, with 39.8% being food waste, followed by 20.7% plastic/rubber. Calorific values range from 4652 kJ/kg for food waste to 32564 kJ/kg for plastic/rubber. Combustion simulations result in maximum flue gas temperatures of 1500 °C, 1200 °C, and 1800 °C under varying air inlet conditions. Turbulence intensities on the grate range from 125% to 174% for these air inlet configurations. The study concludes that moisture content significantly affects calorific value and heat generation during combustion. Higher turbulence intensities lead to increased reaction rates and heat generation, improving the energy efficiency of the process.
城市人口增长、工业化和经济发展导致固体废物产量激增。当当地的回收基础设施不足时,大部分垃圾最终被填埋,造成环境和社会挑战。本研究旨在评估将城市固体废物(MSW)转化为能源的可行性,重点关注沙捞越州美里市的燃烧室模型。有关城市固体废物成分的数据来自二手资料。使用 Ansys Fluent 软件对燃烧室进行建模,并对温度、湍流和物种分布进行模拟探索。城市固体废物的成分显示出较高的实质性比例,其中 39.8% 是厨余,其次是 20.7% 的塑料/橡胶。热值范围从厨余的 4652 kJ/kg 到塑料/橡胶的 32564 kJ/kg。燃烧模拟结果表明,在不同的进气条件下,烟气的最高温度分别为 1500 ℃、1200 ℃ 和 1800 ℃。在这些进风口配置下,炉排上的湍流强度从 125% 到 174% 不等。研究得出结论,水分含量对燃烧过程中的热值和发热量有很大影响。较高的湍流强度可提高反应速率和发热量,从而提高工艺的能效。
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引用次数: 0
Nanoparticles in Soil Remediation: Challenges and Opportunities 土壤修复中的纳米粒子:挑战与机遇
Pub Date : 2023-12-20 DOI: 10.53623/idwm.v3i2.357
Wei Xuen New, J. E. Ogbezode, Paran Gani
Nanoremediation emerges as a promising technology for mitigating soil contamination, encompassing various nanotechnology applications, including chemical degradation, Fenton-type oxidation, photocatalytic degradation, immobilization, and integration with bioremediation techniques like phytoremediation. In addressing soil pollution, the most extensively researched nanomaterials (NMs) are based on carbon, metal and metal oxide, nZVI, and other nanocomposites. Nevertheless, limitations accompany the use of NMs in soil remediation. To assess whether nanotechnology applications outweigh environmental threats, it is crucial to investigate potential effects of NMs on terrestrial vegetation, soil organisms, and human well-being. The impacts of NMs on ecology and the soil environment must be taken into consideration when formulating remediation strategies. Future directions for applied and fundamental studies could include developing multifaceted nanocomposites, integrating them with technologies like bioremediation. Additionally, exploring real-time control and monitoring of NMs and their efficacy in removing pollutants is worth consideration. Pursuing these avenues is vital for advancing the field of soil remediation and comprehending the impact of nanotechnology on the environment.
纳米修复技术是一种很有前途的缓解土壤污染的技术,它包含各种纳米技术应用,包括化学降解、芬顿式氧化、光催化降解、固定化以及与植物修复等生物修复技术的结合。在解决土壤污染问题方面,研究最广泛的纳米材料(NMs)是基于碳、金属和金属氧化物、nZVI 和其他纳米复合材料。然而,纳米材料在土壤修复中的应用也存在局限性。为了评估纳米技术的应用是否大于对环境的威胁,研究纳米材料对陆地植被、土壤生物和人类福祉的潜在影响至关重要。在制定补救策略时,必须考虑到纳米金属对生态和土壤环境的影响。未来的应用和基础研究方向可能包括开发多元纳米复合材料,并将其与生物修复等技术相结合。此外,探索实时控制和监测纳米复合材料及其去除污染物的功效也值得考虑。探索这些途径对于推动土壤修复领域的发展和了解纳米技术对环境的影响至关重要。
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引用次数: 0
Phytoremediation of Microplastics: A Perspective on Its Practicality 微塑料的植物修复:实用性展望
Pub Date : 2023-09-21 DOI: 10.53623/idwm.v3i2.291
Kuok Ho Daniel Tang
Microplastics have permeated all parts of the environment, rendering their removal essential. Numerous strategies ranging from the physical removal of mismanaged plastic items to the biodegradation of microplastics with microorganisms and biocatalysts have been proposed to alleviate microplastic pollution. Phytoremediation is one of the plastic-removing strategies, but it has not received much attention. This perspective paper aims to review the phytoremediation of microplastics and discuss its practicality. The paper shows that plants could act as interceptors and a temporary sink of microplastics by facilitating their deposition, adsorbing them, trapping them in the root zone, enabling them to cluster on the roots, taking them up, translocating them, and accumulating them in various plant parts. However, there was a lack of evidence pointing to the degradation of microplastics after they were adsorbed, taken up, and stored. Weak adsorption and environmental factors may cause the trapped microplastics to desorb, resuspend, or evade, thus also making plants a source of microplastics. The microplastics trapped and accumulated in plants may be transferred to the higher trophic levels of the food chain through ingestion and raise concerns over their ecotoxicities. Unlike localized pollution, microplastic pollution is widespread, which limits the applicability of phytoremediation. Besides, microplastics could adversely impact plant health and the ability of plants to remove other environmental pollutants. These drawbacks may reduce the attractiveness of phytoremediation unless it can be effectively combined with bioremediation to degrade microplastics.
微塑料已经渗透到环境的各个部分,因此清除它们至关重要。人们提出了许多策略,从物理去除管理不善的塑料物品到利用微生物和生物催化剂对微塑料进行生物降解,以减轻微塑料污染。植物修复是一种有效的塑料去除方法,但目前尚未引起人们的重视。本文综述了微塑料的植物修复技术,并对其实用性进行了探讨。该论文表明,植物可以通过促进微塑料的沉积,吸附它们,将它们困在根区,使它们聚集在根上,吸收它们,转移它们,并将它们积累在植物的各个部位,从而充当它们的拦截器和临时汇。然而,缺乏证据表明微塑料在被吸附、吸收和储存后会降解。弱吸附和环境因素可能导致被捕获的微塑料解吸、重悬浮或逃逸,从而也使植物成为微塑料的来源。被植物捕获和积累的微塑料可能通过摄入转移到食物链的高营养层,并引起人们对其生态毒性的关注。与局部污染不同,微塑料污染是广泛存在的,这限制了植物修复的适用性。此外,微塑料可能对植物健康和植物去除其他环境污染物的能力产生不利影响。这些缺点可能会降低植物修复的吸引力,除非它能有效地与生物修复相结合来降解微塑料。
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引用次数: 0
A Review on Pollutants Found in Drinking Water in Sub-Sahara African Rural Communities: Detection and Potential Low-cost Remediation Methods 撒哈拉以南非洲农村社区饮用水中污染物的检测和潜在的低成本修复方法综述
Pub Date : 2023-08-03 DOI: 10.53623/idwm.v3i2.264
B. Fouda-Mbanga, Thulethu Seyisi, Y. B. Nthwane, Bothwell Nyoni, Z. Tywabi-Ngeva
Water is the most essential substance that supports various life mechanisms. It is a fundamental and necessary requirement for mankind and all other living creatures on the planet. Therefore, daily drinking water should be clean, readily available, sufficient, and free from harmful substances. However, in many rural areas, most sources of drinking water are assumed to be safe for human consumption, but this is not always the case. This work aims to provide a review of pollutants found in the drinking water of Sub-Saharan rural communities and explore potential low-cost remediation methods. The assessment of water pollutants and their remediation methods has been the primary focus of research for several years. Additionally, the World Health Organisation has established various minimum standards regarding the concentration of common pollutants in water. This review presents the major sources of water, the origin of contaminants, the different types of pollutants, and remediation methods to enhance the current knowledge in the field of rural drinking water contaminants.
水是支持各种生命机制的最基本物质。这是人类和地球上所有其他生物的基本和必要的要求。因此,每天的饮用水应该是干净的、现成的、充足的、不含有害物质的。然而,在许多农村地区,大多数饮用水源被认为对人类消费是安全的,但情况并非总是如此。这项工作旨在对撒哈拉以南农村社区饮用水中发现的污染物进行综述,并探索潜在的低成本修复方法。多年来,水污染物的评价及其修复方法一直是研究的重点。此外,世界卫生组织还就水中常见污染物的浓度制定了各种最低标准。本文综述了农村饮用水污染物的主要来源、污染物的来源、不同类型的污染物以及修复方法,以提高目前对农村饮用水污染物领域的认识。
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引用次数: 0
Exploring the Potential of Composting for Bioremediation of Pesticides in Agricultural Sector 探讨堆肥在农业部门农药生物修复中的潜力
Pub Date : 2023-05-22 DOI: 10.53623/idwm.v3i1.245
Y. Y. Lau, Erika Hernandes, R. A. Kristanti, Y. Wijayanti, M. Emre
The rapid expansion of the human population has raised the chemical stress on the environment due to the increased demand of agricultural yields. The use of pesticides is the primary contributor to environmental chemical stress, which is essential for agricultural expansion in order to produce enough food to sustain the burgeoning human population. Pesticide residues in soil have grown to be a subject of rising concern as a result of their high soil retention and potential harm to unintended species. Diverse remediation strategies, such as physical, chemical, and biological, for limiting and getting rid of such contaminants have been put forth to deal with this problem. Bioremediation is one of these techniques, which has been deemed the best for reducing pollution because of its low environmental impact, simplicity of operation and construction. Microorganisms are implemented in this technique to break down and get rid of toxins in the environment or to reduce the toxicity of chemical compounds. This study thoroughly analyses the different composting soil remediation methods, including landfarming, biopiles, and windrows, to reduce and eliminate soil pollution. Although biological treatment is the best option for cleaning up polluted soil, it is still important to evaluate and review the approaches over the long term to determine whether they are effective in the field. It is because the reactivity of the microorganisms is highly dependent on environmental parameters, and the contemporary environment is characterised by unpredictable weather patterns, localised droughts, and temperature fluctuations.
由于对农业产量的需求增加,人口的迅速增长增加了对环境的化学压力。农药的使用是造成环境化学压力的主要原因,而环境化学压力对于农业扩张是必不可少的,以便生产足够的粮食来维持迅速增长的人口。土壤中的农药残留由于其高土壤保留率和对意外物种的潜在危害而日益受到关注。为了解决这一问题,人们提出了物理、化学、生物等多种方法来限制和清除这类污染物。生物修复技术就是其中的一种,由于其对环境影响小,操作和施工简单,被认为是减少污染的最佳技术。在该技术中利用微生物来分解和清除环境中的毒素或降低化合物的毒性。本研究深入分析了不同的堆肥土壤修复方法,包括土地耕作,生物菌和窗户,以减少和消除土壤污染。虽然生物处理是清理污染土壤的最佳选择,但长期评估和审查这些方法以确定它们是否在现场有效仍然很重要。这是因为微生物的反应性高度依赖于环境参数,而当代环境的特点是不可预测的天气模式、局部干旱和温度波动。
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引用次数: 1
Municipal Wastewater Treatment Technologies in Malaysia: A Short Review 马来西亚城市污水处理技术综述
Pub Date : 2023-05-16 DOI: 10.53623/idwm.v3i1.243
R. A. Kristanti, Seng Bunrith, Ravinder Kumar, Abdelrahim Omar Mohamed
The aim of this study was to evaluate different municipal wastewater treatment technologies for commercial use and develop an optimized system for a case study plant and future plant designs. Municipal wastewater, classified as a low-strength waste stream, can be treated using aerobic and anaerobic reactor systems or a combination of both. Aerobic systems are suitable for low-strength wastewaters, while anaerobic systems are suitable for high-strength wastewaters. Malaysia has actively implemented various wastewater treatment technologies to address the increasing demand for clean water and reduce environmental pollution. Some commonly used technologies in Malaysia include Activated Sludge Process (ASP), Membrane Bioreactor (MBR), and Moving Bed Biofilm Reactor (MBBR). These technologies show promise in removing emerging pollutants, such as pharmaceuticals and personal care products, which are not effectively eliminated by conventional treatment methods. Additionally, Malaysia could consider investing in renewable energy sources like solar and wind to power wastewater treatment plants, thereby reducing reliance on non-renewable energy and supporting sustainable development. It is also important to emphasize continued public awareness and education initiatives to promote responsible wastewater disposal practices and environmental stewardship.
本研究的目的是评估不同的城市污水处理技术用于商业用途,并为案例研究工厂和未来的工厂设计开发一个优化系统。城市污水被归类为低强度废物流,可以使用好氧和厌氧反应器系统或两者的组合进行处理。好氧系统适用于低强度废水,厌氧系统适用于高强度废水。马来西亚积极实施各种废水处理技术,以解决对清洁水日益增长的需求,并减少环境污染。马来西亚常用的技术包括活性污泥法(ASP)、膜生物反应器(MBR)和移动床生物膜反应器(MBBR)。这些技术有望去除新出现的污染物,如药品和个人护理产品,这些污染物是传统处理方法无法有效消除的。此外,马来西亚可以考虑投资可再生能源,如太阳能和风能,为污水处理厂供电,从而减少对不可再生能源的依赖,支持可持续发展。还必须强调持续的公众意识和教育举措,以促进负责任的废水处理做法和环境管理。
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引用次数: 0
The Impact of Process Variables on the Quantity and Quality of Biogas Generated from Anaerobic Digestion of Food Waste and Rumen Contents 工艺变量对食物垃圾厌氧消化产沼气数量和质量及瘤胃内容物的影响
Pub Date : 2023-04-09 DOI: 10.53623/idwm.v3i1.196
This research aimed to investigate how combining process variables affects biogas production from anaerobic digestion of food waste and rumen contents. A mixture design was used to evaluate the effects of temperature, pH, agitation frequency, and retention time on biogas quantity and quality. Anaerobic mono-digestion and co-digestion were performed using 2 liter single-stage plastic anaerobic digesters. Cumulative biogas volume and its composition, including carbon dioxide, hydrogen sulphide, moisture, and methane content, were estimated volumetrically. The highest biogas volume and quality were obtained under the following conditions: food waste (0.30 kg), rumen content (0.30 kg), water content (0.40 kg), temperature (34.0° C), pH (9.0), agitation frequency (4 times/day), and retention time (32 days). Combining process variables can significantly impact biogas quantity and quality, and optimal process parameters vary depending on the substrate and operational conditions. Anaerobic digestion can effectively manage organic waste, produce renewable energy, and mitigate greenhouse gases.
本研究旨在探讨组合工艺变量如何影响食物垃圾厌氧消化和瘤胃内容物的沼气产量。采用混合设计,考察了温度、pH、搅拌频率和停留时间对沼气数量和质量的影响。采用2升单级塑料厌氧消化器进行厌氧单消化和共消化。累积的沼气体积及其组成,包括二氧化碳、硫化氢、水分和甲烷含量,都是用体积来估计的。在餐厨垃圾(0.30 kg)、瘤胃含量(0.30 kg)、水分(0.40 kg)、温度(34.0℃)、pH(9.0)、搅拌频率(4次/天)、保温时间(32 d)条件下,沼气体积和质量最高。组合工艺变量可以显著影响沼气的数量和质量,最佳工艺参数根据底物和操作条件的不同而不同。厌氧消化可以有效地处理有机废物,产生可再生能源,并减少温室气体。
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引用次数: 1
Heavy Metals in the Soil Around a Cement Company in Sokoto, Northwestern Nigeria Pose Health Risks 尼日利亚西北部索科托一家水泥公司周围土壤中的重金属构成健康风险
Pub Date : 2023-02-12 DOI: 10.53623/idwm.v3i1.183
T. Yahaya, Abdulrazak K. Umar, M. Abubakar, A. Abdulazeez, Bilyaminu Musa, Y. Ibrahim
Cement is widely used in the building industry because it is reliable and because its basic ingredients are inexpensive and abundant. However, the production of cement produces heavy metal-laden dust that can harm humans and the environment. This study aimed to determine the risk posed by heavy metals in the soil around a cement company in Sokoto, Nigeria. Soil samples were obtained at 0.1, 0.5, and 1.0 km from the company and served as test samples, while control samples were obtained at 5.0 km away. The soil samples were treated and assayed for lead (Pb), cadmium (Cd), copper (Cu), and zinc (Zn) using atomic absorption spectroscopy. The values obtained were used to estimate the heavy metals’ average daily inhalation (ADI), average daily dermal exposure (ADDE), hazard quotient (HQ), health risk index (HRI), and carcinogenic risk (CR). Permissible levels of all the heavy metals were detected at all the locations (0.1 > 0.5 > 1.0 > 5.0 km). However, the ADI, ADDE, HQ, HRI, and CR of the heavy metals were above the permissible limits. It can be inferred from the results that the soil around the company can predispose humans to heavy metal toxicities. Consequently, the company needs to prioritize pollution control.
水泥被广泛应用于建筑行业,因为它是可靠的,因为它的基本成分是廉价和丰富的。然而,水泥的生产会产生重金属粉尘,对人体和环境有害。这项研究旨在确定尼日利亚索科托一家水泥公司周围土壤中的重金属所构成的风险。在距离公司0.1、0.5、1.0 km处采集土壤样品作为测试样品,在距离公司5.0 km处采集对照样品。采用原子吸收光谱法对土壤样品进行了铅(Pb)、镉(Cd)、铜(Cu)和锌(Zn)的测定。获得的数值用于估计重金属的平均每日吸入(ADI)、平均每日皮肤暴露(ADDE)、危害商(HQ)、健康风险指数(HRI)和致癌风险(CR)。所有地点均检测到重金属允许含量(0.1 > 0.5 > 1.0 > 5.0 km)。但是,重金属的ADI、ADDE、HQ、HRI和CR均超过了允许值。从结果可以推断,该公司周围的土壤可能使人类易患重金属中毒。因此,该公司需要优先考虑污染控制。
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引用次数: 0
Driving Forces on Household Solid Waste Management Behaviors: A Research for the City of Izmir, Türkiye 生活垃圾管理行为的驱动因素:以土耳其伊兹密尔市为例
Pub Date : 2023-02-07 DOI: 10.53623/idwm.v3i1.165
Elif Duyusen Guven, Gorkem Akinci, Dilara Temel
The proper solid waste recycling process starts at the houses with the attendance of the individuals. The presented study includes comprehensive research on the individuals’ shopping and waste generation behaviors, awareness of waste management issues, readiness and willingness for source separation, and their self-evaluation and self-annoyance about waste generation. The current study was conducted by administering a detailed questionnaire to 300 people in Zmir, Türkiye's third largest city. The relationships between the answers given and the main factors affecting waste production were determined statistically. Principal component analysis (PCA) identified the key drivers of public behavior associated with waste generation and separation at the source. Through environmental sensitivity, including proper waste management behaviors, age is discovered to be a significant factor. Family phenomena, including stable life and family budgets (32.58%), awareness of people about their inappropriate and disproportionate behaviors towards consumption and waste generation (21.28%), and the impositions of urban life (9.37%) were found to be the major factors influencing waste management habits.
适当的固体废物回收过程从家庭开始,由个人参与。本研究包括对个人购物与垃圾产生行为、对垃圾管理问题的认识、对垃圾源分离的准备与意愿、对垃圾产生的自我评价与自我烦恼进行综合研究。目前的研究是通过对基耶第三大城市兹米尔的300人进行详细的问卷调查进行的。给出的答案与影响废物产生的主要因素之间的关系进行了统计确定。主成分分析(PCA)确定了与废物产生和源头分类有关的公众行为的关键驱动因素。通过环境敏感性,包括适当的废物管理行为,发现年龄是一个重要因素。家庭现象,包括稳定的生活和家庭预算(32.58%),人们对消费和废物产生的不当和不成比例行为的认识(21.28%),以及城市生活的强加(9.37%)是影响废物管理习惯的主要因素。
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引用次数: 0
Evaluation of Agricultural Waste Management Mechanism in Iran 伊朗农业废弃物管理机制评价
Pub Date : 2022-12-06 DOI: 10.53623/idwm.v2i2.112
Mohammad Reza Zargaran Khouzani, Zahra Dehghani Ghahfarokhi
The unfavourable situation of waste management in Iran can be seen in different sectors, and agriculture is not excluded from these sectors. The wastes of the agricultural industry can be used in a beneficial way in various agricultural applications and other industrial processes. However, the cost of collection, processing, and transportation can be much higher than the income from the beneficial use of such waste. Incineration of crop residues creates numerous environmental problems. The most important side effects of burning crop residues include the emission of greenhouse gases that lead to global warming, air pollution, and things like soil degradation, loss of soil fertility, loss of beneficial microorganisms, intensification of soil erosion, etc. In the current research, which is a review based on library sources, the mechanism of agricultural waste management in Iran has been evaluated. There are other consequences of such actions. The criteria for action are laws regarding the burning of product residues in Iran, the most important of which are the Waste Management Law and the Clean Air Law. Among these methods are sustainable management methods for product residues, including compost production, biochar production, and waste management at the production site.
伊朗废物管理的不利情况可以在不同部门看到,农业也不排除在这些部门之外。农业废弃物可以在各种农业应用和其他工业过程中以有益的方式加以利用。然而,收集、处理和运输的成本可能远远高于这些废物的有益利用所带来的收入。焚烧农作物残余物造成了许多环境问题。焚烧农作物秸秆最重要的副作用包括排放导致全球变暖的温室气体、空气污染,以及土壤退化、土壤肥力丧失、有益微生物丧失、土壤侵蚀加剧等。本研究以文献资料为基础,对伊朗农业废弃物管理机制进行了评价。这种行为还有其他后果。行动的标准是伊朗关于燃烧产品残留物的法律,其中最重要的是《废物管理法》和《清洁空气法》。这些方法包括产品残留物的可持续管理方法,包括堆肥生产、生物炭生产和生产现场的废物管理。
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引用次数: 1
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Industrial and Domestic Waste Management
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