Eichhornia crassipes Leaves as a Waste-derived Bio-Sorbent to Remove Organics and Nutrients from Rice Mill Wastewater

Proceedings of International Forestry and Environment Symposium Pub Date : 2024-02-15 DOI:10.31357/fesympo.v27.6598

Farwin A.F.S., Pratheepkumar M., Devaisy S.

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Abstract

The increased rate of population growth resulted in the increased number of rice mill industries to fulfill the demand for rice. The rice mill wastewater contains a high load of organics and nutrients. Therefore, the direct discharge of wastewater into the environment may degrade the quality of the environment as well as causes adverse effects on human health. Among various methods to treat waste effluent, bio-sorption is a cheap and environmentally sound approach. Eichhornia crassipes is a noxious weed that spreads rapidly. Most of the tanks in Vavuniya are polluted by E. crassipes and it needs a sustainable solution. This study uses the leaves of E. crassipes to produce waste-derived bio-sorbent to treat rice mill wastewater. The wastewater was collected from one of the rice mills in the Vavuniya town area. The adsorption isotherm and adsorption kinetics experiments were conducted to find out the removal efficiencies of COD, nitrate, and phosphate from wastewater. The effect of the dosage of bio-sorbent (1-6 g/L) and the contact time (30-180 min) with the wastewater was studied to determine the optimum dosage and optimum contact time. The bio-sorbent showed maximum removal efficiencies of COD (54.5%), nitrates (58.1%), and phosphates (29.5%) at the optimum dosage of 4 g/L at 120 min. Based on the t-test, E. crassipes leaves significantly reduce COD, nitrate, and phosphate (p-value<0.05). However, COD and nitrate showed higher removal rates than phosphate. Further, long-term column studies should be conducted to apply the above technique in wastewater treatment plants in treating the rice mill wastewater in the real world. This study emphasizes that E. crassipes leaves have the potential to remove contaminants from wastewater as well as this would also help to minimize the spread of the weed to safeguard the environment. Keywords: Eichhornia crassipes, Bio-sorption, Vavuniya tank, Water quality

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将 Eichhornia crassipes 叶子作为一种废物衍生生物吸附剂来去除碾米厂废水中的有机物和营养物质

人口增长率的提高导致碾米行业数量的增加，以满足对大米的需求。碾米厂废水中含有大量有机物和营养物质。因此，直接将废水排放到环境中可能会降低环境质量，并对人类健康造成不利影响。在各种处理废水的方法中，生物吸附是一种既便宜又环保的方法。Eichhornia crassipes 是一种传播迅速的有害杂草。瓦武尼亚的大多数水箱都受到 E. crassipes 的污染，需要一种可持续的解决方案。本研究利用 E. crassipes 的叶片生产废物衍生生物吸附剂来处理碾米厂废水。废水收集自瓦武尼亚镇地区的一家碾米厂。通过吸附等温线和吸附动力学实验，确定了废水中 COD、硝酸盐和磷酸盐的去除率。研究了生物吸附剂用量（1-6 克/升）和与废水接触时间（30-180 分钟）的影响，以确定最佳用量和最佳接触时间。在最佳用量为 4 克/升、接触时间为 120 分钟时，生物吸附剂对化学需氧量（54.5%）、硝酸盐（58.1%）和磷酸盐（29.5%）的去除率最高。根据 t 检验，E. crassipes 叶片显著降低了 COD、硝酸盐和磷酸盐（p 值<0.05）。不过，化学需氧量和硝酸盐的去除率高于磷酸盐。此外，还应该进行长期的柱状研究，以便将上述技术应用于污水处理厂，处理现实世界中的碾米厂废水。这项研究强调，鹅掌楸叶具有去除废水中污染物的潜力，这也有助于最大限度地减少杂草的传播，保护环境。关键词蟋蟀草生物吸附瓦武尼亚水箱水质

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Proceedings of International Forestry and Environment Symposium

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