毛皮生产废水脱氮工艺参数研究

Nitrogen Removal of Wastewater from Fur Production

针对浙江地区毛皮企业生产废水新的氨氮达标排放要求,对浙江中辉皮草有限公司污水处理生化系统的现行运行过程进行监测,并结合现有企业生化处理系统现状,探索了缺氧-好氧活性污泥工艺(AO工艺)改造后的脱氮可行性。研究结果表明:采用AO工艺后,经优化确定的AO工艺参数为A池与O池水力停留时间(HRT)各为10h,硝化液回流比为100%。经25d现场小试,出水氨氮浓度可低于10mg/L,去除率从原有生化池的40.00%提高到95.25%,CODCr、BOD5、硝态氮与总氮去除率分别达到72.58%、90.72%、70.19%与57.42%,为毛皮废水工程改造提供了重要的工艺参数。

According to the new discharging standard of ammonia nitrogen for fur industrial sewage in Zhejiang, the current operation of biochemical sewage treatment system in Zhejiang Zhonghui Fur Co. , Ltd was monitored. Combined with the current operating situation of biochemical treatment system in this company, the feasibility of denitrification through the reform by AO process was explored. The study indicates that the parameters of AO process decided through optimization are as follows ： HRT in Pond A and Pond O are both 10h, and the reflux ratio is 100%. With 25 days＇ field test, concentration of ammonia nitrogen in sewage could be lower than 10mg/L; removal rate has risen from 40. 00% to 95.25% ; and removal rates of CODcr, BODs, ni- trate nitrogen and total nitrogen has reached 72. 58%, 90. 72%, 70. 19% and 57. 42% respectively. All these provide important process parameters for the modification of fur sewage project.