生物反应器填埋场臭气中微量氨气和挥发性脂肪酸的特征研究

为了消除生物反应器填埋场生化反应产生的一些中间产物(如挥发性脂肪酸和氨)的环境空气污染及其有效控制和预防,本文选用两相生物反应器填埋场与渗滤液直接循环生物反应器填埋场进行了填埋臭气中微量氨气与挥发性脂肪酸的变化规律及特征研究。结果表明,2个生物反应器填埋场中填埋垃圾pH对填埋臭气中氨气和挥发性脂肪酸气体的影响很大,当pH大于7时,臭气中以氨气为主,基本上不存在挥发性脂肪酸气体;当pH小于7时,臭气中以挥发性脂肪酸为主,而氨气几乎不存在。此外,两相生物反应器填埋场在抑制填埋场乙酸、丙酸、丁酸气体的挥发,改善填埋场空气环境污染方面优越于渗滤液直接循环生物反应器填埋场。

Characteristics of the Trace Malodorous NH3 and Volatile Fatty Acids in Landfill Gas from Bioreactor Landfills

In order to efficiently avoid and solve the atmospheric environmental problem of the trace malodorous NH3 and volatile fatty acids,which volatilized from bioreactor landfills due to the anaerobic microbial degradation of organic waste materials,a better knowledge about the concentration variation of the NH3 and volatile fatty acids in bioreactor landfills during decomposition period was required.Two experimental setups of bioreactor landfills(i.e.the anaerobic bioreactor landfill of leachate in-situ circulation and the two-phase bioreactor landfill)were used and the concentrations of the NH3 and volatile fatty acids in the bioreactor landfills during decomposition period were determined.The concentration of the trace NH3 and volatile fatty acids in atmosphere was worked out by ionization equation and Henry law to study the concentration variation characteristics.The results showed that the pH of landfill affect the concentration of ammonia and volatile organic acids in the bad smelly gas distinctly.When pH >7,NH3 was the main composition of the bad smelly gas and the volatile organic acids was hardly examined;while,when pH <7,the conclusion was inverse.Further,the two-phase bioreactor landfill could restrain the volatilization of some volatile fatty acids(acetic acid,propionic acid and butyric acid)and reduce the atmospheric environmental pollution more effectively compared with the leachate-recirculation bioreactor landfill.