摘要
采用膜生物反应器处理人工配制的无机NH+ 4 N废水 ,在NH+ 4 N浓度为 5 0 0mg/L、无排泥条件下运行 2 0 0d(HRT从30h逐步降至 7h) ,系统内污泥浓度从最初的 4 5 0 0mg/L上升至 10 5 0 0mg/L .但是 ,单位污泥中以INTF吸光值表达的活性硝化菌数并未增加 ,从最初的 2 3× 10 -3 降至 1× 10 -3 ;总NH+ 4 N转化速率也从 2 1kg/ (L·d)降至 1 5kg/ (L·d) .同时 ,反应器中胞外分泌产物 (ECP) (糖和蛋白之和反应 )从 30 0mg/L升至 6 0 0mg/L .利用上清液以及ECP提取液进行的批量试验结果表明 。
A membrane bioreactor fed with synthetic ammonium bearing inorganic wastewater was operated under the following conditions: HRT, from 30h to 7h; influent NH + 4-N, 500mg/L; non-discharge of sludge. Formation of extra-cellular polymers (ECP) and their influence on the activity of nitrifiers in the membrane bioreactor was investigated. Over the whole experimental period of 200 d, the activity of nitrifiers in terms of overall ammonium-oxidizing rate decreased from 2.1kg/(L·d) to 1.5kg/(L·d), and the nitrifier number using INTF absorbency measurement decreased from 0.023×10 -3 to 0.01×10 -3, although the MLSS increased from 4 500mg/L to 10 500mg/L. The ECP content increased from the initial 300 mg/L to 600mg/L. Batch tests using the extracted ECP also indicated that the activity of nitrifiers could be inhibited by the existence of ECP.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第6期89-91,共3页
Environmental Science
基金
国家自然科学基金资助项目 ( 5 0 2 3 80 5 0 )
关键词
胞外分泌物
膜生物反应器
硝化过程
活性硝化菌
蛋白质
多糖
extra-cellular polymers (ECP)
MBR
nitrification
activated nitrifier number
protein
polysaccharide
