天然气净化厂高盐环胺废水耐盐菌的应用研究

Study on application of salt-tolerant bacteria in high-salinitycycloamine wastewater from natural gas purification plant

天然气净化厂康索夫(Cansolv)工艺脱硫过程中产生的胺液净化装置(Amine Purification Unit,APU)废水具有高含盐量、高有机物等特点,无法直接采用生物法或物理化学氧化法处理。为解决高盐环胺废水处理这一难题,从废水样品中分离筛选出高效耐盐菌以强化生化处理,采用化学氧化与生物法相结合的工艺对APU废水进行处理,并进行了条件优化。结果表明:APU废水经化学氧化处理后,可生化性显著提高;电渗析产水经化学氧化为生化氧化进水,化学需氧量(Chemical Oxygen Demand,COD)去除率稳定在45%~50%,出水COD浓度可稳定在100 mg/L以内,总氮浓度在30 mg/L以下,氨氮浓度小于1 mg/L,产水满足纳管标准。研究结果为耐盐菌在天然气净化厂APU废水处理中的应用提供借鉴。

The resin regeneration wastewater(APU The amine purification unit wastewater produced in the desulfurization process of Cansolv process in natural gas purification plant has the characteristics of high salt content and high organic matter,so it cannot be directly treated by biological method or physical and chemical oxidation methods.In order to solve the problem of high-salinity cycloamine wastewater treatment,this study separated and screened highly efficient salt-tolerant bacteria from sewage samples to enhance the biochemical treatment,and adopted the APU wastewater treatment process combining chemical oxidation and biological methods,and optimized the operating conditions.The results showed that the biodegradability of APU wastewater had significantly improved after chemical oxidation treatment.The electro-dialysis water was chemically oxidized to be biochemical oxidation feedstock,and the COD(chemical oxygen demand)removal rate could be stabilized at 45%~50%,the effluent COD concentration could be stabilized within 100 mg/L,the total nitrogen concentration was below 30 mg/L,and the ammonia nitrogen was less than 1 mg/L.The effluent water meets the water quality standards for discharging into municipal sewage piping network and provides reference for the application of salt-tolerant bacteria in the APU wastewater treatment in natural gas purification plant.