微电解-絮凝预处理味精发酵废母液实验研究

Pretreatment of fermentation mother liquid of monosodium glutamate by microelectrolysis-flocculation

味精发酵废母液COD浓度极高,为了有效降低后续生物处理单元的负荷,研究采用微电解-絮凝方法预处理该废水。实验研究了曝气对废水COD去除率的影响,用正交实验考察了原水和出水pH值、Fe/C和反应温度等因素对COD去除率的影响,实验结果表明,曝气能有效提高COD去除率;在正交实验确定的优化因素组合,即原水pH为2,出水pH值为9,Fe/C为0.5的条件下反应3 h,废水COD平均去除率可达到48.7%。

Fermentation mother liquid of monosodium L-glutamate wastewater has very high COD concentration.In order to reduce organic load in the subsequent bio-treatments,a study of pretreatment using microelectrolysis-flocculation was carried out.The experiment investigated the influences of pH,Fe/C and reaction temperatures on COD removal rate and an orthogonal test was carried out to search the optimum experimental conditions.The result indicated that aerating can observably increase COD removal rate;the optimal reaction parameter were： initial pH=2,outflow pH=9,Fe/C=0.5,reaction time=3 h,average COD removal rate can attain to 48.7% under the optimal conditions.