Study On The Risk Response Technology Of Water Pollution In Waterworks While Reconstruction And Extension

With the development of economy and the improvement of people’s living standard, thedemand of the quantity and quality of water is gradually increasing. Meanwhile, due to theintensification of water pollution, all kinds of sudden water pollution incidents continue tooccur. In addition, resuing frequently of waterworks wastewater water in the renovation andexpansion may also cause water pollution. It is a urgent problem that how to improve theemergency response capacity to sudden and periodic water pollution in the renovation andexpansion of the water plant.The east waterworks of the GaoYao city is using conventional process for waterpurification, while on the three phase of the project construction, the key is to focus on thepretreatment of emergency. This article researches into the existing mature emergencytechnology of water pollution through the simulation of high concentration of algae, high loadof organic pollution and heavy metal pollution to study the controlling effect of the suddenwater pollution in the west river. Result shows that the effectual means of risk control on highconcentration of alage is ozone preoxidation, when the ozone dosage is 3mg / L, the removalof algae rate of more than 95%, and the removal of CODMnabove of 30%. When the anilinepollution is to break out, the effective way is adding the activated carbon, owing to its bestadsorption effect. when adsorption time is 30 min and the dosage of activated carbon is 20mg/L, the removal rate of aniline can reach to 70%. Although chlorine dioxide preoxidationcan remove aniline effectively, the dosing quantity is too large. Chemical precipitation andPFS enhanced coagulation all can deal with heavy metals pollution effectively, when theconcertration of cadmium is above of 10 times, the consistency of the effluent is lower than0.005 mg/L.Through the reuse of the sludge water to simulate the high turbidity risk and the risk ofaquatic creatures which are produced by the recycling of factory effluent, results showed thatthe enhanced coagulation has a significantly removal of turbidity, as the PAC dosage for morethan 40 mg/L, the turbidity of filtered water and CODMnall can reach the mark. Theappropriately increasing of pH can help to enhance the emergency capability of PAC to highturbidity. When the pH = 8 in the test, the effect is obvious, PAM can also significantlyimprove emergency response capacity of the PAC. By means of inactivation of oxidation for risk control of aquatic organisms, the inactivation ability of all kinds of oxidants to cyclopsfrom strong to the weak ability is in: chlorine dioxide > ozone >Liquid chlorineL> KMnO4.Through comparing the pretreatment effect of the gravity concentration and granulationfluidized bed enrichment to factory effluent, it is found that the treatment inpact of the latter isobviously better than the former.In the three phase engineering design of the east waterplants in Gaoyao city, it isrecommeded to use lattice flocculent pond、inclined-tube settling tank、V filter、disinfectionby chlorine dioxide and with pretreatment facilities, moreover, in the design, there shuldreserve the land of deap treatment and sludge treatment, the Processing scale is 20,0000 m3/d.Through the designning, calculating to determine the main design parameters of the variousstructures, and finaly to complete the engineering design.