摘要
针对农村红薯淀粉废水COD和氨氮含量高、处理难度大的问题,通过试验寻找一种能够处理红薯淀粉废水并适用于食品加工行业的高效絮凝剂。结果表明,当一级絮凝池中废水pH调节为9~10,二级絮凝池加入8‰质量分数为0.6%壳聚糖溶液,三级串联絮凝池的搅拌速度分别为120、120、40 r/min,初沉池水力停留时间为2 h时,通过进出水水质指标对比,COD Cr、氨氮、总氮的平均去除率分别为26.45%、25.36%、31.66%,大大降低了后续生化工段的处理负荷,使得整体工艺出水达到了《城镇污水厂污染物排放标准》(GB 18918—2002)一级A,并优于《淀粉工业水污染物排放标准》(GB 25461—2010)。
In view of the high content of COD and ammonia nitrogen in rural sweet potato starch wastewater and the difficulty of treatment,a high-efficiency flocculant which could treat sweet potato starch wastewater and was suitable for food processing industry was found through experiments.The results showed that when the pH of wastewater in the primary flocculation tank was adjusted to 9-10,the mass fraction of 8‰in the secondary flocculation tank was 0.6%chitosan solution,the stirring speed of the three-stage series flocculation tank was 120,120 and 40 r/min respectively,and the hydraulic retention time of the primary sedimentation tank was 2 h,the average removal rates of COD Cr,ammonia nitrogen and total nitrogen were 26.45%,25.36%and 31.66%respectively,greatly reducing the treatment load of the follow-up biochemical section,making the overall process effluent meet the class I A of the discharge standard of pollutants for urban sewage plant(GB 18918-2002),and superior to the discharge standard of water pollutants for starch industry(GB 25461-2010).
作者
冯可
金鹏
匡武
王翔宇
杨文韬
FENG Ke;JIN Peng;KUANG Wu(School of Resources and Environment,Hefei University of Technology,Hefei,Anhui 230009;Anhui Environmental Protection Publicity and Education Center,Heifei,Anhui 230061;Anhui Academy for Environmental Science Research,Provincial Key Lab of Reserch on Wastewater Treatment Technology,Hefei,Anhui 230022)
出处
《安徽农业科学》
CAS
2020年第18期75-79,共5页
Journal of Anhui Agricultural Sciences
基金
国家水体污染控制与治理科技重大专项“沙颍河农业面源污染控制与水质改善集成技术研究与综合”(2015ZX07204-007)。
关键词
红薯淀粉废水
壳聚糖
絮凝处理
中试试验
Sweet potato starch wastewater
Chitosan
Flocculation treatment
Pilot test
