摘要
针对煤气化废水的水质特点,采用同步氧化工艺进行中试研究,分析同步氧化装置对主要污染物的去除能力,考察溶解氧(DO)、水温(T)、p H、ρ(COD)/ρ(TN)等主要环境因素对脱氮效果的影响。结果表明:在HRT为55.6 h,ρ(COD)=631~973 mg/L,ρ(NH+4-N)=215~261 mg/L,ρ(TN)=232~284 mg/L,ρ(SS)=131~167 mg/L,p H=7.82~8.35的进水条件下,最终出水CODCr,NH+4-N,TN及SS的最大质量浓度分别为23.2,1.34,73.3和21.2 mg/L,平均去除率分别为97.1%,99.4%,74.7%和87.9%,出水CODCr,NH+4-N及SS质量浓度满足DB 37/599—2006中重点保护区域的水质排放要求;该技术以同步硝化反硝化(SND)的方式实现高效脱氮,脱氮的最佳环境条件为ρ(DO)=2.0~2.5 mg/L,T=26~30℃,p H=7.5~8.0,ρ(COD)/ρ(TN)=8~9。
According to the water quality characteristics of coal gasification wastewater,the technology of simultaneous oxidation was used to conduct a pilot scale research. The removal ability to leading pollutants and effects on nitrogen removal by primary environmental elements such as dissolved oxygen( DO),water temperature( T),p H andρ( COD) / ρ( TN) ratio were analyzed. The results indicate that: Under the influent conditions of HRT = 55. 6 h,ρ( COD) = 631-973 mg / L,ρ( NH+4-N) = 215-261 mg / L,ρ( TN) = 232-284 mg / L,ρ( SS) = 131-167 mg / L and p H =7. 82-8. 35,the maximal mass concentration of CODCr,NH+4-N,TN and SS in the last effluent were 23. 2,1. 34,73. 3and 21. 2 mg / L,with the mean removal rates of 97. 1%,99. 4%,74. 7% and 87. 9%,respectively. The mass concentration of CODCr,NH+4-N and SS in the effluent met the discharge standard of comprehensive pollutants for the route of south-to-north water diversion in the key protection areas of Shandong( DB 37 /599—2006). Under the optimal environmental conditions of ρ( DO) = 2. 0-2. 5 mg / L,T = 26-30 ℃,p H = 7. 5-8. 0 and ρ( COD) / ρ( TN) = 8-9,the technology can achieve efficient nitrogen removal by the way of simultaneous nitrification and denitrification( SND).
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2014年第S2期550-554,共5页
Journal of China Coal Society
基金
科技部技术开发研究专项基金资助项目(2008EG122189
2009EG122186)
浙江省重大科技专项资助项目(2009C03005-2)
关键词
煤气化废水
同步硝化反硝化
同步氧化
脱氮
coal gasification wastewater
simultaneous nitrification and denitrification
simultaneous oxidation
nitrogen removal
