Wazirpur industrial area of Delhi generates a huge quantity of sludge per day, which is highly acidic in nature (pH 2.7 to 4.4) and contains macronutrients, micronutrients as well as toxic metals. A pot-culture experi...Wazirpur industrial area of Delhi generates a huge quantity of sludge per day, which is highly acidic in nature (pH 2.7 to 4.4) and contains macronutrients, micronutrients as well as toxic metals. A pot-culture experiment was conducted by taking the two soils (JNU and Chhattarpur) amended with sludge (0%, 10%, 20%, 30%), pretreated with lime (0%, 0.5% and 1%). Two wheat seedlings were planted per pot containing 3 kg sludge amended or control soil and the experiment was carried out till harvesting (four months) in a glass house. Lime treatments enhanced the N content in wheat plant in almost all cases. Sludge and lime treatments enhanced dry weight in wheat plants grown in Chhattarpur soil and dry weight increased with time. Maximum growth was observed in 0.5 lime treated and 20% sludge amended soils. But we have to take an account about any kind of metal toxicity before disposal of this waste to land.展开更多
In recent time Bangladesh faces a serious problem of soil pollution due to plastic contamination. However, the degree of the extent to which the effects of plastics on plant growth occur is not properly identified. An...In recent time Bangladesh faces a serious problem of soil pollution due to plastic contamination. However, the degree of the extent to which the effects of plastics on plant growth occur is not properly identified. An experiment was conducted to measure the effects of mixed plastic (polyethylene and disposable plastic glass) on the growth of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;">. Different doses of mixed plastics (T0, T1, T2, and T3) were applied with a fixed amount of soil for each of the treatments e.g., T0 (control), T1 (10 gm mixed plastics/3kg soil), T2 (15 gm mixed plastics/3kg soil) and T3 (20 gm mixed plastic/3kg soil), and the growth response of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;"> against plastic was observed for six consecutive weeks. The growth was measured in terms of plant height and girth diameter. The results showed that the presence of mixed plastic had a significant effect on the growth of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;"> and particularly in treatment T3 (3 kg soil/20gm mixed plastic), the plants showed a slower growth response compared to control and the rest of the treatments applied in case of both plant height as well as girth diameter. The statistical analysis (one-way Analysis of Variance) also proved the significance of the treatments (p-values < 0.05) for six consecutive weeks. The experiment was successfully able to set an index on which plastics had their effects on the growth of green amaranth. In addition, the obtained data will be helpful in future research of the study in determining the possible effects of plastic on plant growth viz. green amaranth.展开更多
污水处理厂碳减排是实现“双碳”目标的重要组成部分,进行污水处理厂污染物削减过程碳排放核算,了解其碳排量数据,对污水处理厂碳减排措施的实施具有指导作用。研究以宁波某新建污水处理厂为对象,采用联合国政府间气候变化专门委员会(IP...污水处理厂碳减排是实现“双碳”目标的重要组成部分,进行污水处理厂污染物削减过程碳排放核算,了解其碳排量数据,对污水处理厂碳减排措施的实施具有指导作用。研究以宁波某新建污水处理厂为对象,采用联合国政府间气候变化专门委员会(IPCC)指南方法及现行污水处理厂温室气体核算指南、规范等推荐参数,进行污染物去除过程产生的温室气体排放量核算。结果表明,宁波某新建污水处理厂污染物去除过程中温室气体排放量为42 018.5 t CO_(2)-eq/a,最大温室气体排放源为电力消耗。针对核算结果,在污水处理厂设计过程中选择低碳处理工艺,并给出污水处理厂低碳运行建议。文中采用的碳排放核算方法及工程设计中的低碳减排措施和建议,可为同类污水处理厂碳减排研究提供参考。展开更多
文摘Wazirpur industrial area of Delhi generates a huge quantity of sludge per day, which is highly acidic in nature (pH 2.7 to 4.4) and contains macronutrients, micronutrients as well as toxic metals. A pot-culture experiment was conducted by taking the two soils (JNU and Chhattarpur) amended with sludge (0%, 10%, 20%, 30%), pretreated with lime (0%, 0.5% and 1%). Two wheat seedlings were planted per pot containing 3 kg sludge amended or control soil and the experiment was carried out till harvesting (four months) in a glass house. Lime treatments enhanced the N content in wheat plant in almost all cases. Sludge and lime treatments enhanced dry weight in wheat plants grown in Chhattarpur soil and dry weight increased with time. Maximum growth was observed in 0.5 lime treated and 20% sludge amended soils. But we have to take an account about any kind of metal toxicity before disposal of this waste to land.
文摘In recent time Bangladesh faces a serious problem of soil pollution due to plastic contamination. However, the degree of the extent to which the effects of plastics on plant growth occur is not properly identified. An experiment was conducted to measure the effects of mixed plastic (polyethylene and disposable plastic glass) on the growth of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;">. Different doses of mixed plastics (T0, T1, T2, and T3) were applied with a fixed amount of soil for each of the treatments e.g., T0 (control), T1 (10 gm mixed plastics/3kg soil), T2 (15 gm mixed plastics/3kg soil) and T3 (20 gm mixed plastic/3kg soil), and the growth response of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;"> against plastic was observed for six consecutive weeks. The growth was measured in terms of plant height and girth diameter. The results showed that the presence of mixed plastic had a significant effect on the growth of </span><i><span style="font-family:Verdana;">Amaranthus</span></i> <i><span style="font-family:Verdana;">viridis</span></i><span style="font-family:Verdana;"> and particularly in treatment T3 (3 kg soil/20gm mixed plastic), the plants showed a slower growth response compared to control and the rest of the treatments applied in case of both plant height as well as girth diameter. The statistical analysis (one-way Analysis of Variance) also proved the significance of the treatments (p-values < 0.05) for six consecutive weeks. The experiment was successfully able to set an index on which plastics had their effects on the growth of green amaranth. In addition, the obtained data will be helpful in future research of the study in determining the possible effects of plastic on plant growth viz. green amaranth.
文摘污水处理厂碳减排是实现“双碳”目标的重要组成部分,进行污水处理厂污染物削减过程碳排放核算,了解其碳排量数据,对污水处理厂碳减排措施的实施具有指导作用。研究以宁波某新建污水处理厂为对象,采用联合国政府间气候变化专门委员会(IPCC)指南方法及现行污水处理厂温室气体核算指南、规范等推荐参数,进行污染物去除过程产生的温室气体排放量核算。结果表明,宁波某新建污水处理厂污染物去除过程中温室气体排放量为42 018.5 t CO_(2)-eq/a,最大温室气体排放源为电力消耗。针对核算结果,在污水处理厂设计过程中选择低碳处理工艺,并给出污水处理厂低碳运行建议。文中采用的碳排放核算方法及工程设计中的低碳减排措施和建议,可为同类污水处理厂碳减排研究提供参考。
