摘要
采用好氧与电絮凝联合工艺处理糖蜜酒精厌氧出水,考察COD和色度的去除效果。首先,采用SBR工艺去除废水中的易降解污染物。结果表明：采用SBR法处理稀释10倍的糖蜜酒精厌氧出水,适宜的水力停留时间为10 h;COD去除率为42%,脱色效果不明显,BOD5/COD由0.54下降到0.09,好氧出水难以生化降解。进一步采用电絮凝法处理好氧出水,并考察了极板间距、初始p H值、电流密度和电解时间等因素对COD去除及脱色效果的影响。结果表明,在极板间距为3 cm、废水p H=7.83（无须调节,最佳p H=6~8）、电流密度为10 m A/cm2、电解时间为30 min的条件下进行电絮凝处理,与稀释10倍的糖蜜酒精厌氧出水相比,COD总去除率可达86%,脱色率达95%。
This paper is to propose a newly renovated processing method by combining the aerobic treatment and the electro-coagulation to remove COD and chroma from the molasses alcohol anaerobic effluent（ MAAE）. For the said purpose,we have first of all managed to dilute the sewage by 10 times and make it treated via the aerobic SBR process in hoping to get rid of the readily degradable pollutants. The results of our experiment have shown that the optimal HRT that can be shortened to 10 hours with the greatest COD removal efficiency being 42%,though the effect of decoloration may not be desirable. At the same time,the BOD5/ COD can be expected to decrease from 0. 54 to 0. 09,which is likely to impede the biodegradation of the aerobic effluent. All this may account for the necessity to treat further the aerobic effluent in hoping to promote the electro-coagulation for removing the refractory pollutants. It is just for this purpose that we have investigated the removal efficiency of COD and chroma from the aerobic effluent by treating the electro-coagulation through a number of parameters（ such as the inter-electrode distance： 2-6 cm; initial p H： 2-10;current density： 5-20 m A / cm2 and electrolysis time： 10-40min）. Thus,the results of our experiments show that the COD and chroma removal efficiency can be made to increase with the decrease of the inter-electrode distance. And,during the electrolysis period of no more than 20 min,the removing efficiency of the refractory pollutants can be expected to increase with the rise of the current density and the extension of the electrolysis time. Moreover,in comparison with the diluted MAAE,excellent results with COD and chroma removal efficiency can be made to reach86% and 95% respectively under the optimal conditions, of which the inter-electrode distance was 3 cm,p H = 7. 83（ without adjustment,the optimal p H range was 6-8）,with the current density being 10 m A / cm2 and electrolysis time being 30 minutes.In addition,the COD concentration can also be made to drop from821 mg / L to 196 mg / L with the decrease of chroma from 650 to35 through the electro-coagulation treatment under the optimal conditions. Thus,it can be seen that the study helps to provide a new effective process for MAAE treatment.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2015年第5期251-254,共4页
Journal of Safety and Environment
关键词
环境工程学
好氧处理
电絮凝
糖蜜酒精厌氧出水
environmental engineering
aerobic treatment
electro-coagulation
molasses alcohol anaerobic effluent
