Projection Applying Of CASS In Southwestern China Small Sewage Treatment Plant

Small sewage treatment plant in urban planning, construction and investment, sewerage, operational management, and many other respects, striking feature, but China's water treatment technology areas lack individualized technical research and design guidelines.From the environmental protection of technology resources distribution point, small and medium-sized towns of environmental protection technology and professional relatively limited, therefore the technical need to find an operational management is relatively simple, safe and efficient method; from an economic perspective, small and medium-sized towns limited; from the environmental protection of the quality point of view, the need to ensure that effluent quality compliance, prevent sludge, etc. of secondary pollution. Due to the low level of economic development, processing requirements, a serious lack of operational management experience and a wide variety of issues, and big cities, in the small towns of small sewage treatment plant design, construction, and operations more difficult, small town sewage treatment technologies and research and development for devices is the current urgent problems [8]. Looking for investment, low operation costs province, process flow, better, run-to-manage technology is our small town sewage treatment plant dedicated to the study and seeking direction.As the official TGP L?bau and Western development policy implementation, southwest of the town has a booming good opportunity. However with the development of the economy will certainly bring increasingly serious environmental harm. The environmental threats of municipal sewage is absolutely cannot be neglected, in strengthening economic construction, sewage treatment and other infrastructure must also keep up with the pace.However subject to regional conditions, economic constraints, these small-town infrastructure is extremely weak, most are no sewage treatment facilities. Plus, the financial ability is limited, production management level is low, makes these areas sewage treatment works completely different from the economically developed areas.This thesis to typical Sichuan panzhihua-nosed dam sewage treatment works as research objects. Analysis of the characteristics of small sewage treatment works, visit select investment is low, compact, flexible and running water stable CASS process wastewater treatment technologies, engineering research.A wide range of wastewater treatment, the small town of reality is more complex, town sewage treatment should address their actual circumstances, contrast filter. This article provides a on the southwestern Chinese towns small sewage treatment plant process selection and construction techniques with the reference value. As of the depth and breadth of the implementation of the project, will promote strong southwest area of the small town of economic, environmental, social, three aspects of harmonious development, creating more effective.For small scale of the sewage treatment plant, different countries and regions have different standards. In Europe it is generally believed that service to the community, hotel and other daily processing capacity in 100 ~ 2000 population equivalent sewage treatment plant for small sewage treatment plant. Mainland China and Taiwan were of the view that the scale of small sewage treatment plants should be in 10000 population equivalent following or 4000m3/d. Of course the single-family home, single buildings, communities scattered area of sewage treatment facilities should belong to small sewage treatment areas.Southwestern towns with lower levels of economic development, economic power limited, invest sewage treatment of insufficient funds, pollution prevention and control of infrastructure shortage, the lack of environmental pollution control professional facilities and technical personnel, and so is a small town West of increasing water pollution.In the southwest of town there is an urgent need to strengthen the sewage treatment and speeding up the construction of sewage treatment plant. At the same time, in view of the West of the small town of features, you must use the three low a little "sewage treatment technologies, that is, low capital cost, low-cost, low-run management operations management requirements, secondary pollutant emissions less sewage treatment technologies. Wastewater treatment processes should be based on size, water features, affected by the water environment and local circumstances and requirements, based on the overall economic comparison after optimization technology.In the southwest of the small town of geographical and economic characteristics, require small sewage treatment plants must adopt the three low a little "sewage treatment technologies, that is, low capital cost, low-cost, low-run management operations management requirements, secondary pollutant emissions less sewage treatment technologies.Through a combination of technical and economical comparison, CASS process has a distinct competitive advantage. In particular, it occupies an area of the province, investments run small, flexible, for terrain conditions is more complex, you can use a small area of Southwest is very beneficial. Therefore, this study select CASS process as a further study of core technology.Our many sewage treatment using CASS process actually run clear, CASS process with art process simple, process stability, small footprint, investment and low operating costs, high impact loads and nitrogen and phosphorus ability, etc.Panzhihua terrain features and the city group-distribution, determines the sewage treatment plant project should follow a "small, dispersed" principle, which is in the southwest of the small town of typical features.The burden for short-nosed dam sewage treatment works and the current situation of urban planning, determining the short-nosed dam sewage treatment scale and into and out of the water quality. In turn, chose to CASS process as the core with d-type filter technology processes.On-nosed dam sewage treatment plant with comprehensive engineering design.Water plant eventually covers 1.3ha, engineering investment 5711.22 millionIn March 2009, sewage treatment plants to start debugging. During debugging into smaller water plant and fluctuations; water quality within the scope of design, our engineering quality prediction and select more reasonable. Due to the relatively small amount of water into the factory, process load is low, so consider giving full play to the CASS process running flexible features, first two cell culture inoculation. Due mainly to the domestic sewage water, nutrients are complete, so direct training method.On March 7, started a 15d of debugging, and a half months after the sludge CASS pool already generated a certain concentration of activated sludge. 3/28/reaction pool MLSS achieve design standards. From CODCr, SS, NH3-N, TP removal rate of 85.9%, respectively, 92.3% and 64.3% and 81.1%, various water quality index and activated sludge reaches or superior design goals, successfully implements the activated sludge and system debugging, at this point the system begins running, effluent quality good.The training period, continuous microbes observation also indicates that the reactor activated sludge normal growth.For a period of 10 months of continuous and stable operation, the effluent quality objectives are achieved or superior design values; in May and September, into the CODCr value far in excess of design values, the value is less than the water CODCr design value, visible the system has certain impact load of ability; better phosphorus removal, removal rate of 51.6% ~ 77.7%; NH3-N removal rate of 58.9% ~ 98.7%; even in winter the temperature is low, the system will still be able to run.Statistics during the entire stable operation system on the N, P removal efficiency found: experimental sludge during load is low, SRT in 15d, on N removal efficiency is better, but the water temperature nitrogen efficiency with greater impact; phosphorus content because the water is low, reactor operating normally, basic can keep more than 60% of removal rateTo sum up, CASS process has low investment, covering province, running flexible, handling and stability of a clear advantage, for this thesis target water plant is very beneficial. After the project is completed in just half a month's time, has completed the sludge. In the next 10 months of stable operation in the effluent to be stable, on raw water quality and quantity of the impact load also has the strong tolerance.