CN-114890624-B - Sewage treatment process based on sludge biochar carrier

CN114890624BCN 114890624 BCN114890624 BCN 114890624BCN-114890624-B

Abstract

The invention discloses a sewage treatment process based on a sludge biochar carrier, which belongs to the technical field of sewage treatment and comprises a first treatment section, a second treatment section, a third treatment section and a sand filtration section, wherein sewage is subjected to aeration aerobic treatment through the first treatment section, aeration synchronous nitrification and denitrification treatment through the second treatment section, TN in the sewage is treated through the third treatment section, SS is removed through the sand filtration section, and the total residence time is controlled to be 6-12 hours. The scheme adopts three sections of biological membrane treatment to realize aerobic treatment and synchronous nitrification and denitrification treatment of sewage, has high treatment efficiency, and has good treatment effect on low C/N wastewater especially without adding carbon sources. The invention has simple and efficient process, low energy consumption and small occupied area, and is especially suitable for treating small-scale urban sewage, rural sewage and water environment black and odorous.

Inventors

GAO WEIMIN
CHENG HANFEI
XU CHI
RAN JING
ZHU QIAOHONG

Assignees

中冶生态环保集团有限公司
中冶生态环保集团有限公司

Dates

Publication Date: 20260421
Application Date: 20220520
Priority Date: 20220520

Claims (9)

1. A sewage treatment process based on a sludge biochar carrier is characterized by comprising a first treatment section, a second treatment section, a third treatment section and a sand filtration section, wherein the first treatment section, the second treatment section, the third treatment section and the sand filtration section are integrated in a box body from top to bottom, a first filler for carrying out aeration aerobic treatment on sewage is filled in the first treatment section, a second filler for carrying out aeration synchronous nitrification and denitrification treatment on the sewage is filled in the second treatment section, a third filler for carrying out TN treatment on the sewage is filled in the third treatment section, aeration assemblies are arranged in the first treatment section and the second treatment section, a partition plate is arranged at the top of the first treatment section, the second treatment section, the third treatment section and the sand filtration section, water inlets are arranged at the top of the box body, water outlets are arranged at the bottom of the partition plate, and the sewage sequentially flows through the first treatment section, the second treatment section, the third treatment section and the sand filtration section, and the total residence time is controlled to be 6-12 hours; the first filler in the first treatment section is a sludge biochar carrier material, and the surface of the sludge biochar carrier is coated with an aerobic biological layer, wherein the aerobic biological layer is coated outside the carrier material by a biological adhesive, and aerobic microorganisms are immersed in the aerobic biological layer; the sludge biochar carrier material comprises sludge-based biochar, a binder and a functional material, wherein the binder comprises an organic binder and an inorganic binder, and the weight parts of the components are as follows: 100 parts of sludge-based biochar; 0.1-10 parts of organic binder; 1-20 parts of inorganic binder; 0.1-10 parts of functional material; 20-100 parts of water; The functional material comprises a foaming agent, an adsorbent and reinforcing fibers, wherein the foaming agent, the adsorbent and the reinforcing fibers are mixed according to the weight ratio of 1 (10-100) (5-50); the components are mixed and solidified to form the sludge biochar carrier material; The second filler in the second treatment section takes a sludge biological carbon-sulfur-based mineral carrier material as a core, and a sulfur autotrophic denitrifying bacteria layer and an aerobic microorganism layer are sequentially coated on the surface of the sludge biological carbon-sulfur-based mineral carrier material, and the aerobic microorganism layer is coated on the outer part of the sulfur autotrophic denitrifying bacteria layer; The sludge biochar-sulfur-based mineral carrier material comprises sludge-based biochar, a binder, a sulfur-based mineral material and a functional material, wherein the binder comprises an organic binder and an inorganic binder; the components are mixed and solidified to form the sludge biochar-sulfur-based mineral carrier material; The third filler in the third treatment section takes the sludge biological carbon-sulfur-based mineral carrier material as a core, and coats the surface of the sludge biological carbon-sulfur-based mineral carrier material with a sulfur autotrophic denitrifying bacteria layer.
2. The sewage treatment process based on the sludge biochar carrier according to claim 1, wherein the sludge biochar carrier material has a particle size of 1-2cm and a specific gravity of 0.8-1g/cm 3 , the first filler has a filling rate of 20-30% in the first treatment section, the dissolved oxygen is controlled to be 2-3mg/L, and the residence time of the sewage in the first treatment section is controlled to be 2-4 hours.
3. The sewage treatment process based on the sludge biochar carrier according to claim 2, wherein the sludge biochar-sulfur-based mineral carrier material has a particle size of 1-2cm and a specific gravity of 1-1.2g/cm 3 , the filling rate of the second filler in the second treatment section is 30-40%, the dissolved oxygen is controlled to be 1-2mg/L, and the residence time of the sewage in the second treatment section is controlled to be 3-5 hours; the sludge biochar-sulfur-based mineral carrier material comprises the following components in parts by weight: 100 parts of sludge-based biochar; 0.1-10 parts of organic binder; 1-20 parts of inorganic binder; 10-50 parts of sulfur-based mineral material; 0.1-10 parts of functional material; 20-100 parts of water.
4. The sewage treatment process based on the sludge biochar carrier according to claim 3, wherein the filling rate of the third filler in the third treatment section is 60-80%, the dissolved oxygen is controlled to be 0.2-0.5mg/L, and the residence time of the sewage in the third treatment section is controlled to be 1-3 hours.
5. The sewage treatment process based on the sludge biochar carrier according to claim 4, wherein quartz sand is filled in the sand filtering section, the particle size of the quartz sand is 0.5-1mm, and the residence time of the sewage in the sand filtering section is controlled to be 0.01-0.5 hours.
6. The sewage treatment process based on the sludge biochar carrier according to claim 1, wherein when the concentration of effluent water after sewage is treated by the first treatment section, the second treatment section, the third treatment section and the sand filtration section is increased, a reflux system is started, the reflux system comprises a reflux pipe and a reflux pump, the inlet end of the reflux pipe is communicated with the outlet end of the third treatment section, the outlet end of the reflux pipe is connected with the inlet of the first treatment section, and the reflux pump is arranged on the reflux pipe.
7. The sewage treatment process based on the sludge biochar carrier according to claim 1, wherein the diameter of the water passing holes on the partition plate is 0.5-1cm.
8. The sewage treatment process based on the sludge biochar carrier according to claim 6, wherein the aeration assembly is an aeration disc, the aeration disc is respectively arranged at the bottoms of the first treatment section and the second treatment section, and the aeration disc is connected with the fan through an air pipe.
9. The sewage treatment process based on the sludge biochar carrier according to claim 8, wherein an air quantity control valve is arranged on the air pipe, and a water outlet control valve is arranged at the bottom of the box body.

Description

Sewage treatment process based on sludge biochar carrier Technical Field The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment process based on a sludge biochar carrier. Background At present, the problem of lower C/N of the inflow water of sewage plants in China generally exists. The research and study show that 80% of sewage plant water inflow BOD5/TN is less than 3.6, and most sewage plants have the problem of insufficient denitrification carbon source, so that the effluent quality of the sewage plants is difficult to reach the gradual strict emission standard. Although the denitrification effect of the low-C/N sewage can be effectively improved by adding an external carbon source, adjusting the operation parameters of the process, optimizing and distributing the carbon source in the raw sewage and the like. However, the urban sewage treatment plants are located in different areas, the water quality of the inflow water is greatly different, and even under the same C/N value, the difference of denitrification effect can be caused due to different availability of raw water carbon sources. Therefore, the utilization efficiency of various carbon sources in the sewage is further subdivided, so that the denitrification effect of urban sewage treatment plants in China is effectively improved. Meanwhile, under the large background of urban and rural economic development and population flow, rural domestic sewage technology in China needs to be advanced every time, and technical routes according to local conditions are explored. The current village and town sewage treatment modes in China comprise decentralized treatment, village centralized treatment and urban drainage pipe network treatment. In general, small-sized aggregation of single or several households is suitable for a distributed small-sized sewage treatment device or a natural treatment mode, and a village-level sewage treatment station can be built for centralized treatment in a larger village, so that sewage can be discharged into a town sewage pipe network for transportation to a town sewage treatment plant in suburban villages. According to the data of the living building, the urban sewage treatment rate in 2020 exceeds 97%, but the rural sewage treatment still has very large short plates, and the treatment rate in 2021 is only 28%. The reasons for the slow progress of rural sewage treatment include high construction cost of sewage treatment facilities, high operation and maintenance difficulty and the like. The conventional sewage treatment process is high in treatment cost aiming at the situation that a carbon source is required to be added for urban low-C/N wastewater treatment, rural domestic sewage is dispersed, sewage treatment facilities are high in construction and operation cost, and a large amount of land resources are occupied. Disclosure of Invention The invention aims to provide a sewage treatment process based on a sludge biochar carrier, and aims to solve the technical problems of low rural sewage treatment development caused by high cost and high maintenance difficulty of sewage treatment facilities in the prior art. In order to solve the technical problems, the invention adopts the following technical scheme: The sewage treatment process based on the sludge biochar carrier comprises a first treatment section, a second treatment section, a third treatment section and a sand filtration section, wherein the first treatment section is internally filled with a first filler for aeration and aerobic treatment of sewage, the second treatment section is internally filled with a second filler for aeration and synchronous nitrification and denitrification treatment of sewage, and the third treatment section is internally filled with a third filler for treating TN in the sewage; The sewage sequentially flows through the first treatment section, the second treatment section, the third treatment section and the sand filtration section, and the total residence time is controlled to be 6-12 hours. Preferably, the first filler in the first treatment section is a sludge biochar carrier material, the surface of the sludge biochar carrier is coated with an aerobic biological layer, the sludge biochar carrier material is formed by solidifying sludge biochar, a binder, a foaming agent, an adsorbent and reinforcing fibers, the particle size is 1-2cm, the specific gravity is 0.8-1g/cm & lt 3 & gt, the filling rate of the first filler in the first treatment section is 20-30%, the dissolved oxygen is controlled to be 2-3mg/L, and the residence time of sewage in the first treatment section is controlled to be 2-4 hours. Preferably, the second filler in the second treatment section takes a sludge biochar-sulfur-based mineral carrier material as a core, the surface of the sludge biochar-sulfur-based mineral carrier material is sequentially coated with a sulfur autotrophic denitrifying bacteria layer an