Research On Application Of Halophilic Bacteria In2,4-D Wastewater Treatment

A large number of high salt wastewater is produced in the2,4-D production process, which not only contains phenol,2,4-dichlorophenol, chloroacetic acid,2,4-D acid, and by-products chlorinated phrnolic (parachlorophenol, chlorophenol, o-chlorophenol, and2,4,6-trichlorophenol), but also contains the12%of salt. Presently, high-salinity wastewater is mainly treated by the following two crafts, which are bio-analysis and physico-chemical methods. The former process mainly adopts the electro-dialysis, multiple-effect evaporation desalination processes, which are high energy consumption, poor economic returns, most importantly, some of which exist the secondary pollution shortcomings. The latter process mainly chooses the activated sludge, while the salinity and phenolic compounds have toxic effect on microorganisms, which mean the2,4-D high salinity phenolic wastewater can not treated through biological crafts directly. In practice, this kind of high-salinity wastewater is diluted with tap water. This leads to the wastewater quantity increasing, fresh water consumption increasing and the cost increasing greatly. This paper chooses the halophilic bacterium to deal with the2,4-D high salinity wastewater, which can give full play to the economic of biological method and the environmental harmless. Using halophilic bacteria to deal with2,4-D high salinity wastewater has very good application value.The difficulties reflected in the following respects:1Screening out the halophilic bacteria or the halotolerant bacteria. And this bacteria can tolerant the poison of high salt and phenolic organic.2Make the halophilic bacteria industrialization expanding feasible through the experiments, which makes the use of large number of species become simple.3The microorganisms missing problem was solved through choosing the proper strains fixed technology and the right porous adsorption.After the laboratory test, the industrial application experiment was marched in Rainbow Chemical Company. Results showed that the average removal rate of COD was95%, and the quality of outlet water was up to the level standard of Shandong peninsula valley comprehensive pollutant discharge standard (DB37/676-2007), while the cost was only20%of the traditional burning method.