Experiment Research on Leachate Treatment of Sanitary Landfill for Municipal Solid Waste

It is difficult to treat landfill leachate in China.Traditional biologic method and physical method always have high expenses,or cann''t reach the discharge standards.The authors use a new biologic method to treat landfill leachate,which is the Wood_microbial System from Japan.The system to be digested by 3 aeration tanks and 1 reaction tank.The comparison combine processed wool_dust broken pieces with the certain grain degree size were throw in the tanks.Dirty and organic matter are in the digest tanks through the aeration reaction and aneration reaction repeatedly.In this experiment the speed of wastewater discharge and oxygen supply has been changed, and the change of biologic system and the effect of pollutant are removed. The optimal treatment condition can be found.The experiment shows that the system has a good result,special for nitrogenous.The BOD is average to do away with the rate to amount to 90%,almost reach the second class or third class for leachate standard.But BOD loading should be not beyond 4 kg/(m 3.d),othrwise,the system will not operate in normally.     

Functional Microbial Diversities in Wastewater Biological Treatment

Molecular biotechnology as one of culture-independent methods has been increasingly used in the studies of wastewater microorganisms, and many uncultured populations have been revealed, which have changed many views of microbial ecology. This paper gives a succinct review of recent studies in wastewater microorganisms. Some novel, in many cases yet not cultured bacteria were identified to be responsible for filamentous bulking and foaming as well as phosphorus and nitrogen removal in wastewater treatment systems ; however, some predominate population recognized previouslY were proved unimportant. The data give some insights about microbial diversity, population dynamics, terns stability and specific microbial population activity, and they will be helpful to optimize plant design and parameter control. ecosysprocess     

Measures of Rainwater and Sewage Shunting in Chongqing Changshengqiao Sanitary Landfill

This paper focuses on the measures of rainwater and sewage shunting in Chongqing Changshengqiao sanitary landfill. The catchment area of this landfill is totally about 331700 square meters. If the rainwater blends with the sewage, the processing load of the leachate will increase greatly. Thus, the measures of rainwater and sewage shunting must be taken during solid waste filling. In this paper, the authors firstly analyze the measures of rainwater collection and drainage and establish the guideline of pumping assisted by draining. Furthermore, according to the practical situation of landfill, a detailed plan is set down for rainwater and sewage shunting. The effect is quite evident after implementation of the plan for half a year. The processing load of the leachate has been reduced largely. It is proven that the shunting measures are feasible.     

Life Cycle Assessment System for the Whole Process of Municipal Wastewater Treatment Plants

Life Cycle Assessment(LCA) technology is an effective means in determining sewage treatment processes scientifically. This paper uses a sewage treatment process facility as the main line with the application of LCA technology. The Whole Life Cycle of the municipal wastewater treatment plants is divided into three stages：construction stage, operation stage, discarding and removing stage. This paper analyses the whole life cycle of the municipal wastewater treatment plants by the basic framework of LCA. Not only environmental load but also economic and technical factors are contained in the LCA mode. It is demonstrated by the concrete example of two municipal wastewater treatment plants, with evaluating the advantages and disadvantages of the two treatment processes accordingly.      

Improved Analysis Hierarchy and Fuzzy Evaluation Model for the Selection of Drinking Water Treatment Process

As the increasingly serious contamination of source water as well as the more stringent water quality standard, the pretreatment and advanced treatment were required for water supply enterprises.To find an appropriate treatment, the traditional approach is normally based on experts' knowledge and their experience which has several shortcomings.In order to find an effective and efficient way coping with the issue during selecting the optimal technologies for water treatments, an improved analysis hierarchy and fuzzy evaluation model was proposed.With the model, multi stage fuzzy synthetic judgment was adopted with the Improved Analysis Hierarchy amended by Accelerating Genetic Algorithm.The application of this model had been introduced for the selection of supply water treatment technologies in a particular waterworks in Chongqing.     

Treatment of Wastewater in City District by Hydrolytic,Acidification and Biological Contacting Oxidation Process

The hydrolytic acidification, biological contacting oxidation process has been adopted to treat the wastewater with capacity of 100 m 3/d in the city district. An effluent with BOD<20 mg/L, COD<60 mg/L, SS<20 mg/L, NH 3-N<15 mg/L has been obtained when the inlet BOD,COD, SS and NH 3-N are 86 mg/L, 215 mg/L, 116 mg/L and 28 mg/L, respectively. It meets the national wastewater discharge standard.     

Discussion of the Application and Foreground of Falling Water Aeration with the Process of Sewage Treatment

The engineering design of sewage treatment plant for the Chongqing city, P. R. China is analyzed in this paper. Considering the situation of China and other projects, the characteristics of falling water reactor for the environment protection project and economy of investment is introduced ; the application and foreground of falling water aeration in the process of sewage treatment is discussed, such as Oxidation - ditch, SBR, and so on. The conclusion indicated that the falling water aeration can be designed and used as an independent aeration, and, it is an upgraded technology of sewage treatment which is adaptive for city water environment control in middle and small towns in China. The falling water aeration may reduce running cost of the sewage treatment plant, is adaptive for foothill and the mountainous areas, and reduces project investment and environments damage.     

Application and Trend of Development of Sludge Thickening Technology in Municipal Wastewater Treatment Plant

In this paper,the present state of application and research of sludge thickening technology in municipal wastewater treatment plant are summed up and the trend of development of sludge thickening technology is pointed out.     

Comparing of the Project of Drainage System and Waste Water Treatment in Chongqing City

It's more complex to program drainage plan in mountainous city .Now there are some changes in Chongqing, one of these changes is treatment wastewater from natural water sections to few centralized area. In this paper systems theory is adopted and many factors are combined with such as technology, economics, society and politics to discuss drainage project in main districts of Chongqing and draw a conclusion as the argument result. So the article suggests that it is necessary to collegiate argumentation with different point of views, differents subjects and different ranges. And it must be assured by law procedure.     

Analysis and Treatment of the Quality Accident of Circle Beam in a Certain Big Wineshop

In this paper,through the analysis of the engineering quality accident of the top circle beam in a certain big wineshop,a mechanical model of the reinforced concrete circle beam is proposed.By calculation and analysis,the reason of cracking in the circle beam support was found out,and the correct calculated result was made out,so that the engineering quality accident was timety treated.     

The Study and Prospect of the Secondary Clarifier Models in Wastewater Treatment

The paper reviews the research status of the secondary clarifier model from one-dimensional model to three-dimensional model. The one-dimensional model based on solid flux theory was outlined by discussing how to choose model parameters such as settling velocity function and the number of layers. Based on the achievement of actived sludge model and the development of wastewater treatment technology, it is suggested that the development of the secondary clarifier model should focus on the establishment of some clarifier model including biological processes and the enrichment of hydraulics phenomena modeling.     

Control Strategy of DO Parameter Based on Human Simulated Intelligence in the Wastewater Treatment Process

The treatment of wastewater is a complicated biological and chemical process, which can not be described precisely with a mathematical model. It is almost impossible to get a satisfactory control result when a traditional PID control method is adopted, for the parameters of the activated-sludge process are uncertain. The paper takes DO parameter controlling as an example, and proposes a human-simulated intelligent control strategy to reduce the fluctuation problem of DO parameter. Both the control rules and the structure of control system are presented. The simulation experiments shows that the control effect of activated-sludge process by HSIC is much better than PID control.