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

A technology of biological pretreatment and falling water aeration, which is applied in the field of drinking water safety, can solve the problems of limited treatment capacity of small molecular organic matter and ammonia nitrogen, failure to meet the requirements of effluent water quality, inflexible adjustment of hydraulic retention time, etc. Investment and operating costs, low operating costs, and the effect of saving investment and operating costs

Inactive Publication Date: 2011-01-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 Pr

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

Examples

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Example Embodiment

[0029] Example 1:

[0030] The device of this invention is tested and researched. The pebbles in the first-stage gravel bed 2 are 20-30mm, the second-stage gravel bed 6 is 10-15mm, and the third-stage gravel bed is 5 -10mm; the drop height between each level of gravel bed 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℃.

[0031] Table 1: Inlet and outlet water quality of Example 1

[0032] project

Example Embodiment

[0033] Example 2:

[0034] The device of this invention is tested and researched. The pebbles in the first-stage gravel bed 2 are 20-30mm, the second-stage gravel bed 6 is 10-15mm, and the third-stage gravel bed is 5 -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.

[0035] Table 2: Inlet and Outlet Water Quality of Example 2

[0036] project

[0037] According to the above data, for COD Mn , The concentration of ammonia nitrogen exceeds the slightly polluted source water of Class III water body, after passing through the falling water biological aerated filter, the concentration of organic matter and ammonia nitrogen are greatly reduced, meeting the requirements of two indicators in the drinking water sanitation standard. The water pretreated by this facility is then subjected to sand filtration o...

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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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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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