Elastic fiber biological filter technique for treating sewage

Abstract

The invention relates to a sewage treatment process with a biological filter, particularly to a sewage treatment process with a biological filter filled with elastic fibers. The process comprises the following steps of: (1) packing elastic fibers in an opening biological filter with the natural extension length of the elastic fiber being 50-90% of the biological filter height; (2) compressing the elastic fibers to 50-60% of the natural extension length; closing a water outlet port of the biological filter, introducing sewage into the biological filter from a water inlet port, uniformly distributing via a top plate provided with water inlet pores, allowing water to naturally fall into the elastic fibers for percolation treatment, and closing the water inlet port; and allowing the sewage to stand inside the biological filter for 1.5-2.5 hours; (3) opening the water outlet port of the biological filter, allowing the water treated by elastic fibers to naturally flow out under the gravity action, and operating the biological filter without water for 1.5-2.5 hours; and (4) repeating the steps (2) and (3). The inventive process has the advantages of high hydraulic load and high sewage treatment efficiency; and can rapidly solve clogging problem.

Description

technical field [0001] The invention belongs to the field of sewage treatment and water purification, and in particular relates to a biological filter sewage treatment process. Background technique [0002] The disadvantage of the secondary sewage treatment system of the conventional activated sludge method is that the system construction investment is large, and the operation and maintenance costs are high, while the percolation treatment technology has a greater advantage in reducing the treatment cost. The rapid infiltration of sewage (Rapid Infiltration) land The treatment system (referred to as RI system) is to put sewage in a controlled manner on the surface of the land with better permeability, so that it can experience different physical, chemical and biological effects during the downward infiltration process, and finally achieve the purpose of sewage purification. The core of the system is to use the natural soil layer as the infiltration medium. Its hydraulic load...

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Problems solved by technology

[0003] (1) The hydraulic load of the infiltration system is controlled by the permeation rate of the sewage in the infiltration medium. The flow of sewage in the infiltration medium is greatly affected by the porosity and pore size (especially the pore throat). The hydraulic load of the RI system The load is generally only 0.3-0.4m / d. Due to the large particle size of the infiltration medium, the CRI system increases the hydraulic load to 1.5m / d, but it leads to a decrease in the specific surface area of ​​the infiltration medium, which affects the microbial pollution of sewage. If the infiltration medium is too thick, the seepage path of the sewage in the infiltration medium will be prolonged, which will lead to a decrease in the hydraulic load. Considering the balance between the hydraulic load and the treatment efficiency, it is difficult to further increase the hydraulic load significantly. improve;

[0004] (2) During the operation of the infiltration system, once the organic load in the sewage exceeds the biological oxidation and decomposition capacity of the system, it will cause organic pollutants and a large number of microorganisms to accumulate in the system, and black biological mucous film will be produced, causing the system Whether it is RI system or CRI system, the phenomenon of clogging cannot be avoided

This is determined by the theory of system operation. Blockage not only reduces the hydraulic load and treatment efficiency of the system, but also affects the normal operation of the system, so that the system stops running or is abandoned. Therefore, how to quickly restore the processing capacity of the blocked percolation system, It is a difficult problem to be solved to avoid the accumulation of organic matter and clogging, and to adapt to various changes and maintain a stable operating state.

[0005] (3) Due to the small hydraulic load of the general infiltration system, it occupies an excessively large area. With the acceleration of the urbanization process, the towns are becoming more and more crowded, and the space limitation makes the general infiltration system suitable for towns. It is very restricted, and it is difficult to realize the application of this technology in the urban area, and the application of this technology will be affected in the suburbs due to the occupation of land resources such as farmland

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