High Salt Chemical Wastewater Treatment Process And Parameter Optimization Of Research

With industrialization, more and more attention wastewater treatment with high salinity, salt is the major toxic inorganic poisons, that high concentrations of inorganic salts. Toxic substances on biological treatment of wastewater and the type and concentration of toxicants in general can be classified as the stimulus concentration, inhibition and toxicity of three categories. High concentrations of inorganic salts on the toxicity of wastewater biological treatment is mainly through increased osmotic pressure and damage the environment of the cell membrane and the bacteria in vivo microbial enzymes, thus undermining the physiological activities of microorganisms. Salty wastewater treatment has already become one of the focus of wastewater engineering.Based on the results of pilot plant study in one Chemical Industry Co., Ltd. produced a high concentration of salt in wastewater. Provide the basis for engineering. The wastewater treatment process and the possible Cl- concentration on the impact of biochemical system was explored, the microorganisms in the normal biological conditions, did not develop the case of high concentrations of halophilic, the microorganisms withstanding the maximum concentration of Cl- was found. Validation of the biochemistry of Ozone Oxidation. Proportional allocation of the pilot experiment pilot wastewater as water sources, and diluted with water mixed wastewater, so that the concentration of Cl- in 3000mg/L the following,3000mg/L ~ 4000mg/L, 4000mg / L ~ 5000mg/L, above 5000mg/L over the case of biochemical systems, determination of CODcr removal. Adjustment process during the test to determine the optimal process.The following conclusions were got by the pilot plant study(1) When the water Cl-<5000mg/L, biochemical system cought maintain high efficiency; and when the Cl-> 5000mg/L, the efflutne CODcr was 300mg/L or more by the same treatment process .(2) When the water Cl-<5000mg/L, the use of "anaerobic + aerobic1 + aerobic2," treatment processes, effluent CODcr was the 200mg/L or so, cought not meet emissions standards. We can infer there is a certain amount of organic molecules in the refractory organics, we need a strong oxidation improve the biodegradability of wastewater.(3) After the increased of ozone in aerobic 1, ozone oxidation cought be oxidized by ozone exposure as part of non-degradable organic matter, and to improve the wastewater biodegradability, and then after aerobic 2, further removal of part of the biodegradable organic matter . Chloride concentration in the influent 5000mg/L or less, the use of "anaerobic + aerobic 1+ ozonation + aerobic 2 " treatment processes, the effluent of CODcr can be reduced to less than 100mg/L, and met the discharge standards. Ozone contact time of 20min was the most economic time.