摘要
活性污泥是活性污泥法处理污水过程中的主体,但在受到含有Cu^(2+)的工业废水冲击时,经常会引起活性污泥中毒,影响污水厂的出水水质。针对这一现象,利用同比例缩小的Orbal氧化沟中试模型来考察在受到含有Cu^(2+)的工业废水冲击时,污泥活性以及出水水质的变化。结果表明:当Cu^(2+)=8 mg/L时,冲击8 h系统不受影响;当Cu^(2+)=10、12 mg/L时,污泥活性受到抑制,至32 h时污泥的比耗氧速率(SOUR)最小,分别为9.2、7.8 mg O_2/(g MLVSS·h),对TN的去除率分别为78.21%、44.58%。在Cu^(2+)=10 mg/L、回流比(R)=100%时,系统不受影响。在Cu^(2+)=12mg/L、回流比为100%和110%两种情况下,活性污泥均受到抑制;至40 h时污泥的SOUR最小,分别为8.7、8.8 mg O2/(g MLVSS·h),对COD、TN、TP的去除率分别降至75.38%、48.82%、31.94%和74.81%、50.96%、45.29%。可见,在同一冲击情况下,增加污泥回流比可在一定程度上减轻Cu^(2+)冲击对系统的不利影响。
The activated sludge is the main part in the treatment ot wastewater oy activated process. Industrial wastewater with high concentration of Cu^2＋ often makes activated sludge poisoned and affects the effluent quality of wastewater treatment plant. Aimed at solving this problem, the changes of sludge activity and effluent quality were investigated using proportionally reduced Orbal oxidation ditch pi- lot model with the impact of industrial wastewater containing Cu^2＋. The results showed that when the con- centration of Cu^2＋ was 8 rag/L, the system was not affected after 8 h of impact. When the concentration of Cu^2＋ was 10 mg/L and 12 mg/L, the activity of activated sludge was suppressed. At 32^nd hour, the SOUR of sludge was minimum, being 9.2 mgO2/（ gMLVSS · h） and 7.8 mgO2/（ gMLVSS · h） and the removalrates of TN were 78.21% and 44.58%, respectively. When the concentration of Cu^2＋ was 10 mg/L （R = 100% ）, the system was not affected. When the concentration of Cu^2＋ was 12 mg/L （R = 100% and 110% ） , the activity of activated sludge was suppressed. At 40ta hour, the SOUR of sludge was minimum, being 8.7 mgOJ （ gMLVSS · h） and 8.8 mgO2/（ gMLVSS · h）, respectively. The removal rates of COD, TN and TP were reduced to 75.38%, 48.82%, 31.94% and 74.81%, 50.96%, 45.29%, respectively. It was obvious that under the same impact, the increase of sludge reflux ratio could relieve the negative effect of Cu^2＋ on the system to some extent.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第15期37-41,共5页
China Water & Wastewater
关键词
重金属冲击
ORBAL氧化沟
污泥回流比
运行调控
impact of heavy metals
Orbal oxidation ditch
sludge reflux ratio
operation adjustment
