UASB处理生物柴油废水的效果研究

Treatment of Biodiesel Wastewater by Using UASB-SBR-flocculation

采用升流式厌氧污泥床（UASB）工艺处理地沟油回收制备生物柴油废水,通过试验研究了UASB反应器各个阶段对该类废水的处理效果,并考察了甲基磺酸、对甲基苯磺酸两种预酯化催化剂对该类废水处理效果的影响.结果表明：当进水COD为15 g/L、容积负荷为15 kg/（m3·d）时,UASB反应器COD的去除率稳定在87％左右,出水VFA为4～6 mmol/L,沼气产量为16.8 L/d;当容积负荷稳定在5 kg/（m3·d）,进水甲基磺酸浓度为5500mg/L时,UASB反应器COD的去除率达83％以上,进水对甲基苯磺酸浓度为1 000 mg/L时,UASB反应器COD的去除率为58.3％,从废水处理的难易程度角度考虑,建议采用甲基磺酸为预酯化催化剂.

This paper discusses the treatment of the biodiesel wastewater from waste oil recycles by the combination process of UASB-SBR-flocculation and studies the removal efficiencies of all stages in the wastewater treatment. The results show that, when the COD in influent is 15 g/L and the volume loading rate is 15 kg/（m3 · d）,the removal rate of COD keeps at 87%, VFA in effluent is 4~6 mmol/L and gas production is about 16.8L/d;when UASB volume load is stable at 5 kg/（m3 · d） and the concentration of methylsulfonic acid in influent is 5 500 mg/L,the removal rate of COD is above 83% ; and when the con centration of p-toluene sulfonic acid in influent is 1 000 mg/L, the removal rate of COD is 58. 3%. The study recommends methylsulfonic acid as the catalyst for pre-esterification from the view of the difficulty in wastewater treatment.