Study On The Sudden Water Pollution Accident Emergency Warning System And Ni、Cr、Hg Emergency Treatment

In recent years, China’s sudden water pollution accidents occur frequently, theaccidents not only direct threat to people’s health, but also brought serious damage to theenvironment, and caused huge economic losses. Therefore, it is very important toestablish the sudden water pollution accident emergency warning system and develop theemergency treatment of pollutants.Based on the recent developments on environment warning technology, waterquality simulation, emergency management and practical application, and so on, the riversudden water pollution emergency system was tried to build. At the same time, themethods for treating accidentally polluted Ni, Cr(VI), and Hg in source water wereinvestigated in this paper. The main results and conclusions are following:(1) The building principle of the sudden water pollution accident emergencywarning system, including design process and the basic construction mode, was analyzed,and the framework of the sudden water pollution accident emergency warning systemwas established.(2) Grey prediction theory was applied to the water pollution prevention and control.The GM (1,1) model was improved by residual error correction method, and was appliedin the prediction of pollutants concentration in the sudden river pollution, and then thecontinuous function expression of the pollutant concentration response with the time wasobtained.(3) According to the sudden water pollution accident emergency warning systemframework and the specific condition of the Liujiang River basin, the Liujiang Riversudden water pollution accident emergency warning system framework was established,and the scientific construction plan was proposed at the same time.(4) The removal ability of nickel (Ni), chromium (Cr), mercury (Hg) by the currentprocess of Liuzhou water plant was investigated. The results showed that the removalability of the maximum pollution concentration of Ni, Cr(VI), Hg were0.03mg/L,0.1mg/L,1.5μg/L, respectively. KMnO4pre-oxidation/coagulation process to remove Niin water was adopted and the orthogonal design experiment was used to determine theoptimal conditions for the removal of Ni. The results showed that the optimal conditionsfor the removal of Ni were：the dosage of KMnO4was1.5mg/L, the pH value was9.5,the dosage of PAC was18mg/L and PAM was1.0mg/L, which could treat the raw waterwith the mass concentration of Ni lower than0.22mg/L. FeSO4reduction-flagellationprocess to remove Cr(VI) in water was applied and the orthogonal design was used todetermine the optimal conditions for the removal of Cr(VI). The results showed that the optimal conditions for the removal of Cr(VI) were：the dosage of FeSO4was1.6timesthe theoretical dosage, the pH value was8.0, the dosage of PAC was12mg/L and PAMwas0.8mg/L, which could treat the raw water with the mass concentration of Cr(VI)lower than0.8mg/L. Powder activated carbon enhancing coagulation process to removeHg in water was employed and the orthogonal design experiment was used to determinethe optimal conditions for the removal of Hg. The results show that the optimalconditions for the removal of Hg were： the dosage of powder activated carbon was22mg/L, the pH value was9, the dosage of PAC was18mg/L and PAM was0.5mg/L,which could treat the raw water with the mass concentration of Hg lower than9.0μg/L.