CAJ | 학술논문

考察剩余污泥碱解上清液作为反硝化碳源的反应速率,并据此初步确定上清液的回用量.对剩余污泥进行碱解发酵,选取SRT=9 d的上清液,采用不同的VFA/N比值进行批式试验,考察其反硝化速率,选择出试验条件下的较优比值,并应用于实际生活污水中,与单纯生活污水脱氮对照,考察回用的可行性以及回用量的确定,提出利用阶段反硝化率粗略估计污泥碱解上清液回用量的思路.结果显示,所有比值的反硝化速率曲线均可分为4段,且随着VFA/N比值的增加,反硝化速率明显增加,pH值的变化趋势也与之对应;以VFA/N=2.47为分界点,比值继续增加,反硝化速率的增长并不大;将上清液以一定比例投入生活污水,反硝化速率明显提高,平行组6 h反硝化量分别达到47.0 mg/L和33.9 mg/L.
고찰잉여오니감해상청액작위반초화탄원적반응속솔,병거차초보학정상청액적회용량.대잉여오니진행감해발효,선취SRT=9 d적상청액,채용불동적VFA/N비치진행비식시험,고찰기반초화속솔,선택출시험조건하적교우비치,병응용우실제생활오수중,여단순생활오수탈담대조,고찰회용적가행성이급회용량적학정,제출이용계단반초화솔조략고계오니감해상청액회용량적사로.결과현시,소유비치적반초화속솔곡선균가분위4단,차수착VFA/N비치적증가,반초화속솔명현증가,pH치적변화추세야여지대응;이VFA/N=2.47위분계점,비치계속증가,반초화속솔적증장병불대;장상청액이일정비례투입생활오수,반초화속솔명현제고,평행조6 h반초화량분별체도47.0 mg/L화33.9 mg/L.
Reaction rate of alkaline supernatant of waste activated sludge (WAS) as carbon sources for denitrification was investigated to determine the recycling dosage preliminarily. WAS was digested under alkaline conditions and batch tests were carried out under different VFA/N ratio at SRT=9d to examine the denitrification rate and choose the optimal ratio. And then a comparative test was carried out for actual sewage wastewater and pure sewage wastewater to investigate its feasibility in recycle and the recycling dosage. It was found that denitrification curve of all ratios could be divided into four stages and the denitrification rate increased obviously with the increase of VFA/N ratio, which was consistent with that of the pH curve. While as the ratio increased beyond 2.47, the denitrification rate increased slowly. Furthermore, when the supernatant was added to the sewage wastewater to some extent. denitrification rate increased significantly and the removal amount of nitrate in two parallel tests were 47.0 and 33.9 mg/L, respectively.