Tianjin Urban Sewage Emission Predictions And Utilization Of Polluted Water

Predictions of polluted water emissions and traits of water quality play importantrole in fulfilling the utilization of sewage water. This paper focuses on the Tianjin’surban sewage water treatment and resource utilization.Waste water emissions in Tianjin city by the end of2015was predicted by usinga time series autoregressive differential moving average model and projection pursuitregression exploratory data analysis. Results showed that the industrial wastewateremissions tend to be stable overall but with slightly reduced. On the contrary, thedomestic sewage will increased slightly. Considering the industrial wastewater anddomestic sewage, Tianjin urban wastewater emissions will slightly increase with theoverall trend will remain stable in2015. Tianjin urban sewage emissions will reach4.1million tons in2015.In order to achieve the reuse of water resource, this paper also studied the qualityof polluted water. With the3years water quality monitoring data in Xiaowangzhuangpumping station which belongs to the Tianjin sewage treatment system, the variationpattern of polluted water quality and their distribution types were analyzed. Resultsshow that COD, BOD, NH3and TP were all shown a downward trend, indicated thatthe sewage treatment plant influent water quality improved in general during3years.Using the water quality assurance rate map, the90%guaranteed rate value of COD,BOD and NH3were got. There was a fat tail distribution of the phosphorus index. Sowe use the probability of extreme value analysis to analyze the raw data, and wefound that the Pareto-type threshold distribution function was fitted to the TP. Last the90%guaranteed rate value of TP was calculated based on its peak over distribution.Shortage of water resources has become a main constraint to development ofglobal social and economic, utilization of polluted water is a must step. It can beformulated by both the government regulate the operation mode of economicmanagement and construction of water recycling infrastructure. But there are stillmany shortcomings. In order to promote water resource reuse, in addition to furtherclarify the government’s role in developing the comprehensive utilization of urbanwater resources planning, improving relevant laws and regulations, strengthening scientific and technological innovation, and actively promoting market-based waterresource process, but also the efficiency of sewage treatment plants need furtherimproved which can reduce the cost of water resource. For this purpose, with thestochastic frontier analysis method and data of cost and benefit in2011of fourrunning sewage treatment plants in Tianjin, we assessed the technical efficiency andalso identified the main impact factors of the efficiency.