Institute of Environment and Sustainable Development, Banaras Hindu University, Varanasi, India.
Laboratory of Applied Stress Biology, Department of Botany, University of Gour Banga, Malda 732 103, West Bengal, India.
Waste Manag. 2017 Jun;64:117-132. doi: 10.1016/j.wasman.2017.03.002. Epub 2017 Mar 21.
Environmental and economic implications linked with the proper ecofriendly disposal of modern day wastes, has made it essential to come up with alternative waste management practices that reduce the environmental pressures resulting from unwise disposal of such wastes. Urban wastes like biosolids are loaded with essential plant nutrients. In this view, agricultural use of biosolids would enable recycling of these nutrients and could be a sustainable approach towards management of this hugely generated waste. Therefore biosolids i.e. sewage sludge can serve as an important resource for agricultural utilization. Biosolids are characterized by the occurrence of beneficial plant nutrients (essential elements and micro and macronutrients) which can make help them to work as an effective soil amendment, thereby minimizing the reliance on chemical fertilizers. However, biosolids might contain toxic heavy metals that may limit its usage in the cropland. Heavy metals at higher concentration than the permissible limits may lead to food chain contamination and have fatal consequences. Biosolids amendment in soil can improve physical and nutrient property of soil depending on the quantity and portion of the mixture. Hence, biosolids can be a promising soil ameliorating supplement to increase plant productivity, reduce bioavailability of heavy metals and also lead to effective waste management.
随着现代废物的环保处理所带来的环境和经济影响，人们必须提出替代废物管理实践，以减少因这些废物处理不当而产生的环境压力。城市废物如生物固体富含植物必需的营养物质。从这个角度来看，农业利用生物固体可以实现这些营养物质的循环利用，是管理这种大量产生的废物的可持续方法。因此，生物固体（即污水污泥）可以作为农业利用的重要资源。生物固体的特点是存在有益的植物营养物质（必需元素以及微量和大量营养素），这些营养物质可以帮助它们有效地作为土壤改良剂，从而减少对化肥的依赖。然而，生物固体可能含有有毒重金属，这可能限制其在农田中的使用。重金属浓度超过允许限值可能导致食物链污染，并产生致命后果。生物固体改良剂在土壤中可以根据混合物的数量和比例来改善土壤的物理和养分特性。因此，生物固体可以成为一种有前途的土壤改良剂，以提高植物生产力，减少重金属的生物可利用性，并实现有效的废物管理。
