Drop biological aerated filter suitable for biological pretreatment of micro-polluted water source

Abstract

The invention belongs to the technical field of drinking water safety, and in particular relates to a drop biological aerated filter suitable for the biological pretreatment of micro-polluted source water in rural areas. After entering the filter, raw water is filtered by a third-level transverse flow gravel filter bed and degraded by organisms attached to the surface of gravel, so that part of particulate matters, ammonia nitrogen and small molecular organic matters are removed from the raw water and the pollution load of a subsequent drinking water treatment process is reduced. The biological filter performs oxygenated aeration in a drop mode according to the actual conditions of underdeveloped economy and low management level in the rural areas; the biological filter consists of the third-level transverse flow gravel filter bed, is filled with readily available gravel or cobbles in the rural areas, can adjust hydraulic retention time through a stop log gate at the tail end of the gravel bed, can be flexibly suitable for the water quality of different rural areas and operates; and the invention can be used as a pretreatment process of the conventional drinking water treatment process or an ultrafiltration membrane treatment process.

Description

technical field [0001] The invention belongs to the technical field of drinking water safety, and in particular relates to a falling water aerated biological filter which is suitable for rural use and carries out biological pretreatment for slightly polluted source water. Background technique [0002] In recent years, the source water in rural areas has been polluted by different degrees of organic matter, forming a surface water source with high ammonia nitrogen and high organic matter. At the same time, the country has strictly controlled the water quality indicators of drinking water. water quality requirements. Moreover, the traditional coagulation-precipitation-disinfection process and the emerging membrane treatment process have very limited treatment capacity for small molecule organic matter and ammonia nitrogen, and biological pretreatment must be added before these treatment processes. [0003] The method described in the patent "Drinking Water Source Composite Co...

AI Technical Summary

Problems solved by technology

[0002] In recent years, the source water in rural areas has been polluted by different degrees of organic matter, forming a surface water source with high ammonia nitrogen and high organic matter. At the same time, the country has strictly controlled the water quality indicators of drinking water. Water quality requirements

Moreover, the traditional coagulation-precipitation-disinfection process and the emerging membrane treatment process have very limited treatment capacity for small molecule organics and ammonia nitrogen, and a biological pretreatment process must be added before these treatment processes

[0003] The method described in the patent "Drinking Water Source Composite Constructed Wetland System and Pretreatment Method" (200810064525.6) involving biological pretreatment is cumbersome and highly professional, and is not suitable for implementation in rural areas; the patent "High-speed water supply biological aerated filter and The method described in "Method for Pretreatment of Slightly Polluted Raw Water" (200810028952.9) requires continuous aeration, and the operating cost is relatively high; The pretreatment method uses falling water and oxygenation, which does not require continuous aeration and saves operating costs. However, it uses a vertical flow filter, which makes it inconvenient to replace the filter material in the filter, poor mud discharge, and inflexible adjustment of hydraulic retention time.

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