Study On Treatment Technology Evaluation And Technology Integration For Drinking Water

With the progress of human civilization and population increase as well as industry and agriculture rapid development, the problem of water pollution has become more serious. On one hand, the raw water quality is increasingly deteriorating. On the other hand, the more strict request for effluent drinking water has been presented. It is common for water supply company to face the double pressure of raw water quality worse and water quality standards improved. It is necessary for the conventional process to upgrade technology due to its safety deficiency. Nowdays most of the research on drinking water treatment are unattached and dispersive. Then such research has no relation to a unit, restrict technology advantages combination and cannot satisfy technology application. Consequently it is essential to study on actuality evaluation and technology integration research for drinking water treatment technology. It has important theory significance and research value to classify and summarize for drinking water treatment process as a whole.The study on actuality evaluation for drinking water treatment technology and technology integration was performed by reference research in this dissertation. Further the unit technology and combination process for drinking water treatment technology was summarized. Then the development skeleton of drinking water treatment technology was held as a whole. Commencing with the pollution actuality evaluation and removal technology analysis for representative pollutants, some kinds of effective removal process for representative pollutants of four representative water quality was performed, then the technology integration system of surface water was made. Thus the database of treatment technology for drinking water was established to set up a plateform of intercommunication and share. The main work and results of this dissertation were shown as below:According to different property of pollutants, the pollutants in drinking water can be classsfied into organic pollutants, inorganic and radioactivity pollutants, biologic pollutants and the by-products during production process. Aimed to each kind of the pollutants, some representative and typical pollutants was selected to research. The choice principle for representative pollutants is such pollutants present or usually present as well as impact strongly on drinking water safety. The technology integration for drinking water was performed by reference research in this paper. The investigation time range of reference is from 1994 to 2006. The Chinese and English reference was consulted as follow: first reference is 13250, second reference is 4650, foreign degree paper is 102, international institution official web document is 46, manual and book is 128. Further the whole framework and catalogue formate was put up. Then the principle and technology skeleton of drinking water treatment technology integration was held.After the pollution actuality evaluated and removal technology analyzed for representative organic pollutants, the unit treatment technology was presented for those pollutants. Although the concentration of representative organic pollutants in water is very low, but it can do harm to human health. And the removal technology for representative organic pollutants is taken by advanced process, that is activated carbon or ozone activated carbon process. Now research on removal technology for minim POPs in water works is less than other organic pollutants.The pollution actuality evaluated and removal technology analyzed for other pollutants such as the representative inorganic pollutants, biologic pollutants and the by-products during production process. Then the unit treatment technology was presented for those pollutants. The treatment process is intricate for representative inorganic pollutants. The chemical precipitation or adsorption can be adopted to remove heavy metal pollutants. The sulphide removal technology in drinking water can be adopted by preoxidation combined with conventional process. The conventional process combined the preoxidation will be widely used to attain good removal efficiengy for representative biologic pollutants. The chlorine dioxide and ozone is the best preoxidation reagent and the membrane technology can be thoroughly removed representative biologic pollutants from water. The best available technology (BAT) to remove the formation potential of DBPs is enhanced coagulation. It is important to establish the predictive model for DBPs and to practise in the future. Aluminium coagulant is the main source for the increasing concentration of aluminium in water. The coagulation and sedimentation process have an important effect on residual aluminium. Acrylamide in drinking water comes from the residual single monocase in polyacrylamide when add coagulant in water treatment process. Nowadays such pollution must be controlled by means of decrease the single monocase concertration or introduce another polycoagulant.The typical water quality of surface water was analysed and classified, moreover four kinds of typical water quality of surface water, that is micropollution water, eutrophic raw water of lake and reservoir, low temperature and low turbidity water, pathogeny biology contaminated water was performed. Aimed to four kinds of typical water quality of surface water, some kinds of effective treatment process was put forward. Based on above research, the surface intergration technology was composed of three modules such as enhanced conventional process intergration technology, full process intergration technology, membrane technology intergration technology. Furthermore the surface water technology integration system was established and the application condition was proposed. It is referenced and consultive of technology integration research for drinking water treatment to solve the water quality problem that we are facing now.