The Cleaning Process Research And Engineering Design Of Micro-polluted Water In City A In The North-Eastern Area

As a source of life, water is one of essential elements for people’s life and production. However, the environment, especial for the aquatic environment is contaminated seriously nowadays, which affects the drinking water safety due to the fast development of economy. Therefore, it is necessary to employ efficient water treatment technologies to ensure the safety and health of drinking water.This topic according to A city in northeast China D reservoir water pollution present situation, has carried on the pretreatment technology of ozone, conventional treatment technology, ozone pretreatment + conventional treatment combined operation, ozone activated carbon advanced treatment technology, ozone pretreatment + conventional treatment + test in joint operation of the activated carbon advanced treatment technology experiment research, study the ozone oxidation pretreatment system, conventional coagulation precipitation in processing system, and in the depth of processing system slightly polluted water ozone activated carbon technology on A variety of pollutants removal efficiency and optimum process parameters. And with reference to the design specification,according to the test in test results, the selected design parameters for various structures, engineering design of water treatment works. At the same time to run the economic analysis, management analysis, the analysis of the environmental and energy-saving benefits.Small trials, ozone pretreatment with conventional treatment combination of pollutant removal efficiency show that were significantly improved for the pollutants in the water, UV254, removal rate of COD and TOC respectively increased by 40.7%, 19.9% and 5.5%. But for ammonia nitrogen removal effect is weak, so to be removed by subsequent processing technology. Ozone activated carbon advanced treatment as subsequent processing technology can effectively reduce the water of UV254 and COD, TOC and the concentration of ammonia nitrogen; When ozone dosing quantity in 2.0 mg/L, the maximum removal rate were 34.2%, 43.7%, 36.5%and 46.8%. Ozone activated carbon of nitrite nitrogen removal rate basically stable at more than 90%.In engineering design, water demand projections for A water treatment, water purification processing, determine the design scale of 50000 m3 / d recently, forward design scale of 100000 m3 / d, to the total process to design some of the monomer,by taking the data from experiment study, the treatment process of ozone exposure,mechanical mixing pool, pool folded plate flocculating, inclined tube sedimentation tank, main contact between pool, activated carbon filter, dosing of ozone and ozonegenerator between the selected parameters, make its can achieve slightly polluted water pollutants removal of the project meet the requirements of the national specification standard.Pre ozone with project practice, mechanical mixing folded plate flocculation pool, pool inclined tube sedimentation tank, ozone/activated carbon filter, dosing system and ozone generator rooms energy-saving benefit of economic,environmental impact, and made a detailed analysis, at the same time, according to the process of environment, energy saving measures are put forward and perfect the process of operation and management. Overall efficiency of process design and economic analysis, economic and reasonable, and provide technical reference for the slightly polluted water treatment engineering.