The Study Of Ozonation In Advanced Treatment For Yellow River Reservoir Water

In view of source of drinking water widely polluted, the serious defective in the security of drinking water and so on prominent question in our Country, according to "the National hygienic Standard of Living Water" (GB5749-2006), with pollution characteristic of the supplies of drinking water of Jinan city, the water treatment technology's application and demonstration would be maked for the water source water purification treating processes. The support of science and technology could be provided to improve comprehensively the safe drinking water treatment system. This thesis was a sub-research project "Study on the elimination characteristic and the influencing factor of the smell material and trace organics were removed by advanced treatment", a special grand national science-technology project about the control of water pollution and water quality improvement. This research was conducted to optimize the operation parameters and to explore the removal of various pollutants and impact factors in the ozonation process, providing the design parameters and the basis for the demonstration project.The lab-scale test made on Yellow River water by ozone oxidation indicate that there was an optima dosage when the organic pollutant was removed by ozonation. Moreover, under low O3 dosage increment condition (<3mg/L), the short contact time and the big aeration quantity had a successful removal of CODMn and UV254 in this work; The high ozone throws under the increment condition (>3mg/L), the extension catalytic oxidation time could raise utilization rate of ozone and was helpful to organic matter removal by O3.The pilot-scale experiment was carried out by ozone-biological activated carbon combination processes in Yellow River Waterworks base. When the influent CODMn value was 1.1-1.7mg/L, UV254 was 0.012-0.018cm-1 for the experimental, the removal rate of CODMn and UV254 by ozone-biological activated carbon and the utilization rate of ozone had been investigated in a treatment process, and the optimum operation conditions had been evaluated. The experiment results showed that the best O3 dosage is 2mg/L and the optimum add way of ozone was third-spots adds with the third-level ozone adds ratio 6:2:2. It was proved by the experiment that the removal efficiency of CODMn, and UV254 would be better by O3-BAC for the different water quality of the sources of Yellow River Water. Take the poor-quality water which the influent CODMn and UV254 were 2.4mg/L and 0.032cm-1 as an example, the removal rate of CODmn and UV254 respectively got to 64%and 78%. The removal effect of CODMn and UV254 were closely related to the processing time of activated carbon. The early operation of activated carbon had great absorptivity, the removal rate of CODMn and UV254 reached over 74% and 95%, and the removal rate decreased to 60% and 80% with the lengthening of processing time. The biological activated carbon process was superior to remove small molecular weight organic pollutant (<1k). The big molecule compound which was difficult to be removed through conventional water purification process could be degradated into small molecule organic compound that was readily degraded biochemically by ozonation process. The ozonation process also could increase DO in water, improve the microporous adsorbability of following biological activated carbon and the biodegradation of microorganisms. Under this synergic and complementary role, the removal rate got 64% for TOC and 85% for BDOC. The trace odour contaminants in Water can be totally controlled by ozonation.2-MIB is representative of odour contaminants as a whole inYellow River water, the removal rate of 2-MIB could be up to 92% when O3 dosage was 3mg/L. The O3-BAC process can control chlorination disinfection by-products effectively, The trihalogenmathane yield ability had been reduced by 42% after O3-BAC. The ozonation generated bromate which was a subpect carcinogenic substance, and the removal rates of BrO3- by BAC was only 28%, the sand filtration process was increased in the process of treatment, as a result the concentration of BrO3- was lower than limits of "Water Quality Standard for Urban Water Supply" (CJ/T 206-2005), thus ensuring drinking water quality.