Applied Research Of Complex Halophilic Bacterium In Treatment Of Cyanuric Chloride High-salinity Organic Wastewater

Cyanuric chloride is an important organic intermediates in the paper, medicine, synthetic resin, synthetic rubber, plastics, chemical and other industries with a wide range of uses. Cyanuric chloride wastewater with high salt, high-cyanide, high ammonia, high organic matter content, fairly variable pollutant concentration and pH vary, is very difficult to treat. This article relies on the cyanuric chloride wastewater treatment project of chemical enterprises in Chongqing, the technology and mehanism of the compound halophilic bacteria degrading Cyanuric chloride wastewater are studied. The main results are as follows.Eleven strains of halophilic bacteria were isolated from the liquid and sediment samples, which were from a saltery and a cyanuric chloride factory, and the cells were rod, globular and vibrio shapes. The strains with better growth state and adaptability were selected and mixed to form an aerobic complex halophilic bacterium and anaerobic complex halophilic bacterium, in order to treat the cyanuric chloride wastewater. These halophilic bacteria which were screened out, were identified by microscope observation, Gram staining biochemistry analysis, and the comparison with the Sherlock microbial identification system. The results showed that these stains belonged to Halomona, Pseudomonas, Bacillus respectively.The best growth conditions of the aerobic complex halophilic bacterium were determined as:temperature 35℃, pH value 8.5,120rpm/min, saline concentration 15%. The best growth conditions of the anaerobic complex halophilic bacterium were determined as:temperature 38℃, pH value 9, saline concentration 15%.Experiments were performed in laboratory for treatmant of artificial wastewater by halophilic fungi. The results showed that the complex halophilic bacterium was feasible in the treatment of organic wastewater with high salt environment. These halophilic bacteria comlex were applied to dynamic simulated system comprised of anaerobic filter and bio-contact oxidation tank and underwent domestication. After this biodegradation system was started, acclimatization and setting up, the removal rate was monitored during the system stability, and the removing rates of TOC, NH3-N and CN- could reach 97.06%,90.47% and 97.62%, respectively.The design, commissioning and operation of engineering for treatment of cyanuric chloride high-salinity organic wastewater by Liquid-Membrane - UBF BAF-BAC-MBR process were introduced. The treatment practice indicates that the removal rates of TOC, NH3-N and CN" in the biodegradation treatment system were above 93%,85% and 94%, respectively. The effluent quality was better than the first level criteria specified in the Integrated Wastewater Discharge Standard (GB 8978-1996). The system was stable in operation, good in treatment efficiency, and low in operation cost.