Study On The Treatment Of Micro - Polluted Raw Water Xiangjiang River By O₃ /biological Zeolite

In this reaserch, ozone/biology zeolite process is used to treat the Xiangjiang River micro-pollution water.the static adsorption capability of zeolite to organic matter and ammonia nitrogen is studied, several factors such as biofilm formation,the dosage of ozone,ozone contact time, hydraulic retention time and flushing periodically which affect pollutant removal efficiency are discussed, the best running craft has been determined, and the adsorption decomposition behavior of ozone on biological zeolite is inspected. On that basis, the removal efficiency to the Xiangjiang River has been analyzed, and the following conclusions are obtained:(1) Zeolite adsorption experiment results show that:Acid modified zeolite adsorption capacity of organic matter, The high or low of pH will not help to remove pollutants, Zeolite has a "rapid absorption, slow balance" feature, Zeolite particle size of 10 to 20 projects selected meet the test requirements, Zeolite dosage should be based on reactor capacity and effluent quality requirements established, NaCl and NaOH combined according to the quality of the formation of 1:5 mixture of regeneration ability of the zeolite.(2) The study on biofilm formation showed:When the temperature is around 18℃, relatively stable and high CODMn, NH4+-N removal rate taken as a parameter indicating whether the biomembrance is successful, the time of the Vaccination biomembrance is about 20days,and the process started quickly.Early in its devolepment, organic matter and ammonia nitrogen are removed mostly by ion exchange and adsorption.Later, the surface of the zeolite is covered with a large number of nitrifying bacteria and nitrite bacteria, which can help zeolite eliminate CODMn and NH4+-N in the water. Some studies have shown:when CODMn and NH4+-N removal rate reached above 20% and 60%,it considered that the biofilm is mature.(3) The reaserch on treatment of Micro-polluted Raw Water of Xiangjiang River by Biological Zeolite show that:the average removal rate of CODMn, NH4+-N is 30% and 78%, respectively at water temperature above 18℃, flow of 5L/s,water retention time of 15min,air and water ratio of 1:1.(4) Study on the Treatment of Micro-polluted Raw Water of Xiangjiang River by ozone-Biological zeolite show that:there can be a high removal rate on CODMn and NH4+-N, in the range of 32.30～58.83% and 75.62～93.10%, under the condition respectively at the ozone dosage of 2.1mg/L, ozonation contact time of 15min,and biological zeolite empty bed residence time of 15min (hydraulic loading of 2.3m3/h).