Enhancing Swine Wastewater Treatment: A Sustainable and Systematic Approach through Optimized Chemical Oxygen Demand/Sulfate Mass Ratio in Attached-Growth Anaerobic Bioreactor

Environments Pub Date : 2024-08-01 DOI:10.3390/environments11080162

Mehdi Lamssali, Shobha Mantripragada, Dongyang Deng, Lifeng Zhang

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Abstract

The swine industry generates millions of gallons (thousands of cubic meters) of wastewater every day, posing significant environmental risk due to high concentrations of organics and nutrients. This study aims to investigate the effectiveness of attached-growth anaerobic bioreactors for treating swine wastewater by utilizing sulfate-reducing bacteria, focusing on the impact of chemical oxygen demand (COD)/sulfate mass ratios on organics degradation. A series of lab-scale anaerobic bioreactors were employed to treat swine wastewater for a 14-day period. The study evaluated changes in pH, acidity, alkalinity, COD, sulfate, and various nutrients along with total suspended solids (TSS) and volatile suspended solids (VSS) before and after treatment. At a COD/sulfate mass ratio of 2:1, the bioreactors achieved optimum removal efficiencies of 80% for TSS, 83% for VSS, 86–88% for COD, 82–87% for sulfate, 73% for sulfide, and 73% for sulfite. The nutrient removal efficiency was 67% for nitrate and 72% for nitrite. The acidity and alkalinity were effectively controlled, with alkalinity values reaching up to 2161 ± 92.5 mg/L and pH within the range of 7–7.24. The findings demonstrated that anaerobic bioreactor at a COD/sulfate mass ratio of 2:1 significantly enhanced the degradation of organic matter coupling with sulfate reduction in swine wastewater, providing an efficient and sustainable treatment method.

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加强猪废水处理：附着生长厌氧生物反应器中优化化学需氧量/硫酸盐质量比的可持续系统方法

养猪业每天产生数百万加仑（数千立方米）的废水，由于含有高浓度的有机物和营养物质，对环境造成了严重危害。本研究旨在调查附着生长厌氧生物反应器利用硫酸盐还原菌处理猪场废水的效果，重点关注化学需氧量（COD）/硫酸盐质量比对有机物降解的影响。一系列实验室规模的厌氧生物反应器被用来处理猪废水，为期 14 天。研究评估了处理前后 pH 值、酸度、碱度、化学需氧量、硫酸盐、各种营养物质以及总悬浮固体 (TSS) 和挥发性悬浮固体 (VSS) 的变化。在化学需氧量/硫酸盐质量比为 2:1 时，生物反应器对总悬浮固体的最佳去除率为 80%，挥发性悬浮固体为 83%，化学需氧量为 86-88%，硫酸盐为 82-87%，硫化物为 73%，亚硫酸盐为 73%。硝酸盐和亚硝酸盐的营养物去除率分别为 67% 和 72%。酸度和碱度得到了有效控制，碱度值达到 2161 ± 92.5 mg/L，pH 值在 7-7.24 范围内。研究结果表明，在 COD/硫酸盐质量比为 2:1 的条件下，厌氧生物反应器能显著提高猪场废水中有机物的降解和硫酸盐的还原，提供了一种高效、可持续的处理方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Environments

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