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

A technology of biological pretreatment and water drop aeration, which is applied in the field of drinking water safety, can solve the problems such as the limited processing capacity of small molecular organic matter and ammonia nitrogen, the inability to meet the requirements of effluent water quality standards, and the inflexibility of hydraulic retention time adjustment, and achieve initial savings. Investment and operation cost, low operation cost, effect of saving investment and operation cost

Inactive Publication Date: 2012-05-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Effect test

Embodiment 1

[0030] The inventive device is tested and studied, wherein the pebble gradation in the first-stage gravel bed 2 is 20-30 mm, the pebble gradation in the second-stage gravel bed 6 is 10-15 mm, and the pebble gradation in the third-stage gravel bed is 5 mm. -10mm; the drop height between the gravel beds at all levels is 400mm; the water quality of the inlet and outlet water is shown in Table 1, the hydraulic retention time in the test is 2 hours, and the test water temperature is 21 °C.

[0031] Table 1: The inflow and outflow water quality situation of embodiment 1

[0032] project

[0033] Nitrite nitrogen (mg / L)

Embodiment 2

[0035] The inventive device is tested and studied, wherein the pebble gradation in the first-stage gravel bed 2 is 20-30 mm, the pebble gradation in the second-stage gravel bed 6 is 10-15 mm, and the pebble gradation in the third-stage gravel bed is 5 mm. -10mm; the drop height between the gravel beds at all levels is 400mm; the water quality of the inlet and outlet water is shown in Table 2, the hydraulic retention time in the test is 1 hour, and the test water temperature is 23°C.

[0036] Table 2: the water quality situation of the inflow and outflow of embodiment 2

[0037] project

[0038] According to the above data, for COD Mn The concentration of ammonia nitrogen and ammonia nitrogen exceeds the slightly polluted source water of class III water body. After passing through the falling water aerated biological filter, the concentration of organic matter and ammonia nitrogen is greatly reduced, which meets the requirements of the two indicators in the sanitary ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/24
CPCY02W10/10
Inventor 张晓健张伟陈超李永红汪隽
Owner TSINGHUA UNIV
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