Parameter Configuration Researched of Sludge Drying Treatment System on the Screw Press
Abstract
The basic idea of modular design is applied to the planning and analysis of the screw press sludge treatment system in this paper. A combination mode of sludge treatment system is obtained. The functional modules of the system are formed. The interface information relation of each module is analyzed by system function. The process parameters of each module were precisely configured according to the dry requirements of sludge treatment and the initial sludge concentration. The transfer relationship between modules is achieved. The control parameters are determined according to the transfer relationship. The parameter basis is provided for the control design of the system.
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Introduction
The disposal of sludge is a prominent problem in current environmental protection management. How do sewage treatment plants face the problem of producing a large amount of surplus sludge every day? Due to its large quantity of production, difficulty in transferring and disposal, and the high cost of disposal, it is the focus of the work of enterprises and environmental protection departments at all levels[1-2] .
Improving the concentration and dehydration efficiency of wastewater has become an important issue to realize circular economy and sustainable development. By means of mechanical compression, the mud or viscous liquid mixture is separated into solid and liquid operations, which is called squeezing dehydration. It is an effective method for high dewatering in solidliquid separation technology. Through the improvement and optimization of the researchers, it has been widely used in the fields of chemical industry, metallurgy, energy, dyestuff, food, pharmacy and sludge treatment[3].The theory of screw squeeze is mainly used in the oil and juicing of crops[4].It is still in the initial stage to use this technology for sludge dewatering in the process of sludge dewatering. Theoretical research is not yet perfect. At present, the research in this field mainly focuses on the design of screw press structure, optimization and improvement of experiments and analysis through simulation software. Many scholars have made great progress. The relationship between the use of flocculant and the effect of dehydration was studied by Jaroslav Boráň. The use of flocculant was found under different working conditions. It is helpful to optimize the performance of screw press[5]. Li tong carried out a flocculant screening test and sludge dewatering test in gaobeidian sewage treatment plant. The following conclusions are drawn. Improving the rate of flocculating agent can improve the dewatering performance of the screw press dehydrator. The speed of the screw can be increased appropriately, and the transmission speed of the sludge in the drum is accelerated. The speed of the screw can be increased appropriately, and the transmission speed of the sludge in the drum is accelerated. So it increases the throughput. But if the speed is too fast, it will cause the export pressure drop. Thus, the moisture content of mud cake increases[6] .
In addition to the above research results, some new research directions have been developed in the field of spiral squeezing sludge dewatering. Such as discrete element method, pelease /Thickening theory is applied[7].However, most of the sludge dewatering only analyzes the single equipment, and there is no systematic process analysis[8].In this paper, the function of the system is studied by modularization analysis technique. A modular sludge drying treatment system is designed. The module division and function analysis are carried out for each process of the system. The technical requirements and parameter configuration of the screw pressing technology in the sludge drying system are discussed. A new system of mechanical dehydration was established. Furthermore, the efficiency of sludge dewatering is improved. The dry degree of higher final sludge was obtained.
Conclusion
Sewage treatment technology is a worldwide technical problem. It is desirable to make full use of the sludge to the environment. Sludge treatment system is used, sludge reduction can be realized. The purpose of the sludge can be determined according to the nature of the sludge. For example, paper sludge containing fiber can be incinerated to generate electricity. The sludge contains less pollutants and can be returned to the field or fertilizer after treatment. Industrial sludge must be treated harmlessly to be used. The process control parameter of this paper is calculated by the parameterized program, which is the result of the comprehensive process analysis, and only provides reference for design module selection. The combined parameter chain of the actual system should be analyzed and calculated according to the requirements of the production process, and the necessary experiments should be carried out to modify the parameters. Through parameter configuration analysis, the design parameters of control system can be determined, and the time of design system can be shortened effectively, and the success rate of system combination design is greatly improved.