摘要
试验以实际规模的污水处理厂为研究对象,针对传统CAST工艺脱氮效率不高的问题进行分析研究,采用改良的CAST工艺,在主反应区中增设独立的缺氧搅拌段,合理分配每周期的时间,充分利用原水中的碳源提高系统脱氮性能,TN去除率最多可提高19.4%,出水TN稳定达到一级A标准。考察了冬季低温条件下不同系统的脱氮情况,反硝化菌较硝化细菌对温度更加敏感,水温降到12℃时,反硝化效果受到明显影响,水温降至10℃以下时,硝化反应难以进行彻底,通过增加微生物浓度可改善低温下的脱氮效果,但是系统MLSS质量浓度不宜超过7 000mg.L-1。针对冬季低温提出适宜的运行模式,在MLSS质量浓度为(6 130±367)mg.L-1,曝气165 min的条件下可满足出水TN达到一级A标准并且沉淀较充分出水清澈。
A full-scale wastewater treatment plant was the object of this study. The nitrogen removal performance of its traditional CAST process was analyzed and a modified CAST process was proposed, which introduced an independent anoxic stirring phase in the main reaction zone. The TN removal efficiency could be improved by 19.4% at most and the effluent TN could meet the Primary A standard steadily. The nitrogen removal performance of different systems under low temperature was investigated. Denitrifying bacteria was more susceptible to low temperature than nitrifying bacteria. When the temperature dropped below 12℃, the denitrifying efficiency was influenced obviously. When the temperature dropped below 10 ℃, the nitrifying could hardly proceed thoroughly. The nitrogen removal performance could be improved by increasing MLSS in the system, which should not exceed 7 000 mg. t^-1, however. An operating mode was proposed to cope with low temperature during winter period and the effluent TN could meet the Primary A standard under this mode when MLSS was （6 130±367）mg.L^-1 and the aeration time was 165 min.
出处
《水处理技术》
CAS
CSCD
北大核心
2012年第1期87-92,共6页
Technology of Water Treatment
基金
“十一五”国家科技支撑计划重点项目:SBR工艺城市污水处理厂节能降耗关键技术(2006BAC19B03)
关键词
CAST
硝化
反硝化
低温
污水处理厂
CAST
nitrifying
denitrifying
low temperature
wastewater treatment plant
