Rural sewage treatment process

A technology of rural sewage and treatment process, applied in the direction of biological water/sewage treatment, water/sludge/sewage treatment, special compound water treatment, etc., can solve the problems of high total nitrogen in effluent, high energy consumption of sewage, and poor removal effect of total nitrogen To achieve the effect of improving the utilization rate of oxygen, optimizing the number of cycles, and eliminating the influence of short flow

Pending Publication Date: 2021-06-18
CRRC TANGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of high energy consumption, poor total nitrogen removal effect and high effluent total nitrogen in the existing rural sewage, the invention provides a rural sewage treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the embodiment of the present invention, the rural domestic sewage in a certain city in Quanzhou, Fujian has not been pretreated in a septic tank as the treatment object. The COD of the rural sewage is 280mg / L, and the BOD 5 It is 160mg / L, ammonia nitrogen is 25mg / L, total nitrogen is 85mg / L, and total phosphorus is 5mg / L. Its sewage treatment process includes the following steps:

[0029] The rural sewage is passed into the SBR reaction tank for sewage treatment, and the water inflow is 7.5m 3 / d, the water filling ratio is 0.3; the sequence of the SBR reaction tank is set as water intake, intermittent aeration, sedimentation and decanting, wherein

[0030] The above water intake time is 30 minutes;

[0031] The cycle times of the above-mentioned intermittent aeration is 3 times. The intermittent aeration includes the carbon removal stage and the nitrogen removal stage. The time is 12 minutes, the number of on-off times is 3 times; the time ratio of fan air supply...

Embodiment 2

[0052] The embodiment of the present invention takes the rural sewage pretreated by septic tanks as the treatment object, and the COD of the rural sewage is 180mg / L, and the BOD 5 is 100mg / L, ammonia nitrogen is 20mg / L, total nitrogen is 40mg / L, and total phosphorus is 2mg / L. Its sewage treatment process includes the following steps:

[0053] The rural sewage is passed into the SBR reaction tank for sewage treatment, and the water inflow is 7.5m 3 / d, the water filling ratio is 0.2; the sequence of the SBR reaction tank is set as water intake, intermittent aeration, sedimentation and decanting, wherein

[0054] The above water intake time is 30 minutes;

[0055] The cycle times of the above-mentioned intermittent aeration is 6 times. The intermittent aeration includes the carbon removal stage and the nitrogen removal stage. In the carbon removal stage, the time ratio of fan air supply on and off is 2:1. The time is 6 minutes, the number of on-off times is 1; the time ratio o...

Embodiment 3

[0062] In the embodiment of the present invention, the rural sewage without septic tank pretreatment is used as the treatment object, and the COD of the rural sewage is 400mg / L, and the BOD 5 is 200mg / L, ammonia nitrogen is 50mg / L, total nitrogen is 100mg / L, and total phosphorus is 7mg / L. Its sewage treatment process includes the following steps:

[0063] The rural sewage is passed into the SBR reaction tank for sewage treatment, and the water inflow is 7.5m 3 / d, the water filling ratio is 0.35; the sequence of the SBR reaction tank is set as water intake, intermittent aeration, sedimentation and decanting, wherein

[0064] The above water intake time is 30 minutes;

[0065] The cycle times of the above-mentioned intermittent aeration is 5 times. The intermittent aeration includes the carbon removal stage and the nitrogen removal stage. The time is 8 minutes, the number of on-off times is 2; the time ratio of fan air supply on-off in the denitrification stage is 1:15, the d...

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PUM

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Abstract

The invention relates to the technical field of sewage treatment, and particularly discloses a rural sewage treatment process. According to the rural sewage treatment process, rural sewage is introduced into an SBR reaction tank for sewage treatment, the time sequence of the SBR reaction tank is set as water feeding, intermittent aeration, precipitation and water decanting, the intermittent aeration comprises a carbon removal stage and a denitrification stage, the time ratio of on-off of air supply of a fan in the carbon removal stage is (1-2): 1, and the on-off frequency is 1-3; in the denitrification stage, the time ratio of on-off of air supply of the fan is 1: 10-20, and the on-off frequency is 1-9 times. The outlet water of the rural sewage treatment process provided by the invention not only meets the requirement of the water quality of the outlet water of a pollution discharge unit required by the national first-grade A standard, the removal rate of total nitrogen reaches 90% or above, but also the water and electricity consumption per ton is greatly reduced, and the economic cost is reduced.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a rural sewage treatment process. Background technique [0002] At present, my country's rural sewage discharge is large, but the treatment efficiency is very low. 96% of the villages do not have drainage channels and sewage treatment systems. Most of the sewage is discharged directly without treatment, causing serious pollution to the environment. , Difficult to collect, multiple sources, complex components, high concentration of suspended solids, etc. Restricted by geographical conditions and economic factors, the centralized sewage treatment mode of urbanization is not suitable for rural sewage treatment, so a technology suitable for rural sewage decentralized treatment is proposed It is the key to solve the problem of rural water pollution. [0003] The SBR process is an activated sludge sewage treatment method composed of basic processes such as water intake, aeratio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302C02F3/301C02F2101/16C02F2305/06
Inventor 张华王菲杨雪峰王贵国谷朝阳孙志超吴瑞梅张建华付青云吕兴杨涛
Owner CRRC TANGSHAN CO LTD
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