摘要
通过探索垃圾渗滤液硝化生物强化体系中进、出水含氮化合物形态的转化规律及采用测定呼吸耗氧速率来表征硝化菌群的生物活性等方法研究了不同pH值、进水NH+4-N浓度(负荷)、DO条件下体系的硝化特性。研究发现,酸性条件下,垃圾渗滤液的亚硝化作用较硝化作用受抑制程度大,碱性条件下相反。为了维持较高的硝化效率,垃圾渗滤液的硝化生物强化pH值宜控制在7.5～8.5。实验体系所能承受的氨氮浓度和负荷上限分别为300mg/L和0.6kgNH+4-N/(m3·d)左右,当进水NH+4-N浓度和负荷过高时,硝化细菌活性下降幅度较亚硝化细菌要显著得多。DO影响因子实验表明,DO水平的控制对垃圾渗滤液的生物硝化程度有重要影响,当DO控制在0.5～0.6mg/L时,氨氮的氧化以亚硝化作用为主,当DO控制在1.1～2.6mg/L时,垃圾渗滤液的硝化作用进行得较彻底。
The present paper aims to study the nitrification bioaugmentation features of landfill leachate under various pH values, ammonia nitrogen concentrations （and ammonia loading） and DO levels by means of testing the change of nitrogen-laden compounds in influent and effluent leachate and measuring the biological activities of Nitrobacter and Nitrosomonas with the Oxygen Uptake Rates method. Our study revealed that the nitrosation of landfill leachate was suppressed more severely than the nitrification under the acidic condition, however, the order of these processes was reverse under the alkali condition. Out study also shows that the pH value should be kept at 7.5 - 8.5 if it is necessary to keep higher efficiency in ammonia oxidation. The upper limit of ammonia concentration and loading should be maintained at about 300 mg/L and 0.6 kg NH4^＋-N/（m^3·d） in this experimental system, respectively. Comparatively speaking, the activity of Nitrobacter would decrease notably than that of Nitrosomonas. Besides, DO level may have significant effects on ammonia oxidation in this case. It can be said from our experiment that ammonia oxidation can be realized more desirably if DO can be kept at 0.5 - 0.6 mg/L while the nitrosation is primary, or while DO is kept at 1.1 - 2.6 mg/L.
出处
《安全与环境学报》
CAS
CSCD
2005年第4期26-29,共4页
Journal of Safety and Environment
基金
国家自然科学基金项目(20477011)
关键词
环境工程
垃圾渗滤液
优势菌种
生物强化
氨氮
硝化
environmental engineering
landfill leachate
superiorbacterium
bioaugmentation
ammonia nitrogen
nitrification
