Phosphorus removal and recovery from anaerobic bioreactor effluent using a batch electrocoagulation process

IF 2.4 4区 环境科学与生态学 Q2 WATER RESOURCES Water Quality Research Journal Pub Date : 2023-08-11 DOI:10.2166/wqrj.2023.111
G. P. Bhoi, Kripa S. Singh, Dennis A. Connor
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Abstract

A batch monopolar electrocoagulation system was developed and studied for the removal of phosphorus from anaerobic bioreactor effluent using iron as an electrode material. The study focused on the optimization of the independent variables, such as initial pH, retention time (RT), current density (CD) and inter-electrode distance (IED) using the response surface methodology (RSM) to maximize the removal of total phosphorus (TP). A quadratic model was fitted to the experimental data for TP removal. The optimal parameters were found to be pH of 6.75, RT of 11.06 min, CD of 300 A/m2, and inter-electrode distance of 1.5 cm resulting in 98.05% TP removal and energy consumption of 1.28 kWh/m3. A kinetic study for TP removal revealed that at optimal conditions, removal followed first-order kinetics (K = 0.185 m/min). Phosphorus was recovered from the post-precipitated sludge through combustion at 900 °C followed by acid leaching with sulfuric acid. Acid leaching tests were carried out with sulfuric acid for the post-precipitated sludge obtained at the optimum conditions. It resulted in around 91% of phosphorus recovery at a liquid-to-solid ratio of 100 mL/g.
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间歇式电絮凝法去除厌氧生物反应器出水中的磷
以铁为电极材料,开发并研究了一种间歇式单极电絮凝系统对厌氧生物反应器出水中磷的去除。本研究的重点是使用响应面法(RSM)优化自变量,如初始pH、保留时间(RT)、电流密度(CD)和电极间距离(IED),以最大限度地去除总磷(TP)。将二次模型拟合到TP去除的实验数据中。最佳参数为pH为6.75,RT为11.06min,CD为300A/m2,电极间距离为1.5cm,TP去除率为98.05%,能耗为1.28kWh/m3。TP去除的动力学研究表明,在最佳条件下,去除遵循一级动力学(K=0.185 m/min)。通过在900°C下燃烧,然后用硫酸进行酸浸,从后沉淀污泥中回收磷。对在最佳条件下获得的后沉淀污泥进行了硫酸酸浸试验。在100mL/g的液固比下,它导致约91%的磷回收率。
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CiteScore
4.50
自引率
8.70%
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