Sludge reduction treatment system based on CASS (cyclic activated sludge system) process
By introducing bio-enhanced inactivation reactors and phage-based composite engineered bacteria into the CASS process, the problem of high energy consumption in sludge treatment in the CASS process was solved, and the effects of sludge reduction and stable system operation were achieved.
Patent Information
- Application Number
- CN202422299019.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-09-20
AI Technical Summary
The existing CASS process produces a large amount of sludge during the sludge treatment process. Conventional sludge reduction technology consumes a lot of energy and has high operating costs, and there is a lack of efficient sludge reduction methods.
A sludge reduction treatment system based on the CASS process is adopted, including a pretreatment unit, a CASS biochemical reaction unit, a BSR reaction unit, a temporary bacterial culture unit and a sludge storage unit. A bio-enhanced inactivation reactor constructed with multiple oxidation potential high-entropy alloy chips is used, combined with the domestication and expansion of phage-based composite engineered bacteria to achieve in-situ sludge reduction.
Under the premise of maintaining the biological treatment effect of sewage unchanged, the sludge volume can be reduced and the operating cost can be reduced by inactivating and breaking the cell wall of microorganisms, thus ensuring the stable operation of the sewage treatment system.
Smart Images
Figure CN223329109U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of sludge treatment, and in particular relates to a sludge reduction treatment system based on a CASS process. Background Art
[0002] The main ways to reduce sludge include thermal drying, composting, incineration, sludge digestion and process reduction. Thermal drying evaporates the water in the sludge by heating, reducing the moisture content. It is suitable for large-scale treatment, but the cost is relatively high. Composting uses the organic matter in the sludge for fermentation to generate heat for evaporating water. It is suitable for sludge with a high organic content, occupies a large area, and is difficult to treat odor. Incineration converts sludge into ash through high-temperature combustion, with significant reduction effects, but the cost is high. Sludge digestion uses oxygen to convert sludge into carbon dioxide and water. It is effective and requires professional equipment and management. Process reduction reduces sludge production by optimizing the sludge treatment process. It is effective and requires professional technical support.
[0003] The CASS process is a modified sequencing batch activated sludge process. By adding a bioselector to the SBR tank, it achieves a continuous water inlet and intermittent drainage operation mode. It combines anaerobic, anoxic and aerobic conditions to improve the nitrogen and phosphorus removal effects. However, the sludge treatment process produces a large amount of sludge. Conventional sludge reduction technology mainly focuses on the back-end treatment of sludge. Through physical or chemical methods, the sludge microorganisms are broken to release the water in the microbial cells. The water is then squeezed out by filter pressing to reduce the water content of the sludge, thereby achieving the purpose of sludge reduction. The disadvantage of this method is that it consumes a lot of energy and has high operating costs. Utility Model Content
[0004] In view of the above problems, the purpose of the present invention is to provide a sludge reduction treatment system based on the CASS process.
[0005] The specific technical solutions are as follows:
[0006] A sludge reduction treatment system based on a CASS process comprises a pretreatment unit, a CASS biochemical reaction unit, an effluent disinfection unit, a BSR (bioaugmented reactor) reaction unit, a temporary bacterial culture unit and a sludge storage unit, wherein the pretreatment unit is connected to the CASS biochemical reaction unit, the CASS biochemical reaction unit and the BSR reaction unit are connected via a pipeline to form an internal circulation, the temporary bacterial culture unit and the BSR reaction unit are connected via a pipeline to form an internal circulation, the CASS biochemical reaction unit and the temporary bacterial culture unit are connected via a pipeline circulation, the water outlet end of the CASS biochemical reaction unit is connected to the effluent disinfection unit, and the sludge outlet end of the CASS biochemical reaction unit is connected to the sludge storage unit.
[0007] Furthermore, the pretreatment unit includes a sewage lifting pump, a screen, and a sedimentation tank connected in sequence; the sludge storage unit is a sludge storage tank; and the effluent disinfection unit is a disinfection tank.
[0008] Furthermore, the CASS biochemical reaction unit is a CASS pool, and the BSR reaction unit is a bio-enhanced inactivation reactor constructed with multiple oxidation potential high entropy alloy chips.
[0009] Furthermore, the temporary culture unit is a movable container-type steel structure culture pool with a submersible flow propeller installed therein.
[0010] Furthermore, control valves are respectively provided on the pipeline between the CASS biochemical reaction unit and the BSR reaction unit, the pipeline between the temporary bacteria culture unit and the BSR reaction unit, and the pipeline between the CASS biochemical reaction unit and the temporary bacteria culture unit.
[0011] The beneficial effects of the present invention are:
[0012] 1) The activated sludge treated by the BSR reaction unit in the temporary culture unit can be used as a culture medium for bacterial strains, without the need for additional nutrients. The dominant bacterial strains of sludge that have been domesticated and expanded and added into the system at one time improve the biodegradability of microbial debris while maintaining the biochemical treatment effect of sewage, thus ensuring the stable operation of the sewage treatment system;
[0013] 2) During the transportation process, the residual sludge after treatment in the CASS biochemical reaction unit is treated in the BSR reaction unit. The microorganisms on the sludge surface undergo electrochemical reactions, inactivating their cells and even breaking their cell walls, thus achieving in-situ sludge reduction. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the process of the present utility model.
[0015] In the figure: 1. Pretreatment unit; 2. CASS biochemical reaction unit; 3. Effluent disinfection unit; 4. BSR reaction unit; 5. Temporary bacterial culture unit; 6. Sludge storage unit. DETAILED DESCRIPTION
[0016] The present invention will be further described below with reference to the accompanying drawings, but the protection scope of the present invention is not limited thereto.
[0017] like Figure 1As shown, a sludge reduction treatment system based on the CASS process includes a pretreatment unit 1, a CASS biochemical reaction unit 2, an effluent disinfection unit 3, a BSR reaction unit 4, a temporary bacteria culture unit 5 and a sludge storage unit 6. The pretreatment unit 1 is connected to the CASS biochemical reaction unit 2, the CASS biochemical reaction unit 2 and the BSR reaction unit 4 are connected through a pipeline to form an internal circulation, the temporary bacteria culture unit 5 and the BSR reaction unit 4 are connected through a pipeline to form an internal circulation, the CASS biochemical reaction unit 2 and the temporary bacteria culture unit 5 are connected through a pipeline circulation, the water outlet end of the CASS biochemical reaction unit 2 is connected to the effluent disinfection unit 3, and the sludge outlet end of the CASS biochemical reaction unit 2 is connected to the sludge storage unit 6. The pretreatment unit 1 includes a sewage lifting pump, a screen, and a sedimentation tank connected in sequence. The CASS biochemical reaction unit 2 is a CASS tank, the effluent disinfection unit 3 is a disinfection tank, the BSR reaction unit 4 is a bio-enhanced inactivation reactor constructed with multiple oxidation potential high-entropy alloy chips, the temporary bacteria culture unit 5 is a movable container-type steel structure with a submersible flow propeller, the sludge storage unit 6 is a sludge storage tank, and control valves are respectively provided on the pipeline between the CASS biochemical reaction unit 2 and the BSR reaction unit 4, the pipeline between the temporary bacteria culture unit 5 and the BSR reaction unit 4, and the pipeline between the CASS biochemical reaction unit 2 and the temporary bacteria culture unit 5.
[0018] Example
[0019] A sludge reduction treatment process using the above system comprises the following steps:
[0020] 1) After being pretreated in pretreatment unit 1, the sewage is transported to CASS biochemical reaction unit 2 through a pipeline. 2) After the system is running stably, a portion of the sewage containing activated sludge from CASS biochemical reaction unit 2 is pumped to temporary bacterial culture unit 5. The mixture pumped to temporary bacterial culture unit 5 accounts for 10% of the total volume of the mixture in CASS biochemical reaction unit 2.
[0021] 2) The sludge and sewage mixture in the temporary bacterial culture unit 5 is extracted and treated in the BSR reaction unit 4 before being returned to the temporary bacterial culture unit 5;
[0022] 3) After the sludge and sewage mixture in the temporary culture unit 5 is processed through multiple cycles in the BSR reaction unit 4, a phage composite engineered bacteria is added at one time for domestication and expansion to obtain a high-efficiency composite engineered bacteria;
[0023] 4) The sludge and sewage mixture containing the domesticated and expanded high-efficiency composite engineered bacteria in the temporary culture unit 5 is pumped into the CASS biochemical reaction unit 2 in batches through a water pump;
[0024] 5) After the sludge-wastewater mixture of the CASS biochemical reaction unit 2 is circulated and treated in the BSR reaction unit 4, the sludge production is reduced and the sludge is discharged to the sludge storage unit 6. The remaining sludge is further treated and the effluent is discharged to the effluent disinfection unit 3.
[0025] The phage composite engineered bacteria in step 4) include hydrolytic acidifying bacteria, nitrifying bacteria and denitrifying bacteria, and the number of the added phage composite engineered bacteria is 3 billion per gram of sludge and sewage mixture.
[0026] Taking a sewage treatment plant with a sewage treatment capacity of 20,000 tons / day as an example, the first phase was used as a blank group without any treatment. The second phase was treated with the sludge reduction treatment system based on the CASS process of the utility model. After the system operation stabilized, the average daily dry sludge discharge was calculated.
[0027] Table 1 Comparison of daily mud production under different conditions
[0028]
Claims
1. A sludge reduction treatment system based on CASS process, characterized in that: The invention comprises a pretreatment unit (1), a CASS biochemical reaction unit (2), an effluent disinfection unit (3), a BSR reaction unit (4), a temporary bacterial culture unit (5) and a sludge storage unit (6), wherein the pretreatment unit (1) is connected to the CASS biochemical reaction unit (2), the CASS biochemical reaction unit (2) and the BSR reaction unit (4) are connected through a pipeline to form an internal circulation, the temporary bacterial culture unit (5) and the BSR reaction unit (4) are connected through a pipeline to form an internal circulation, the CASS biochemical reaction unit (2) and the temporary bacterial culture unit (5) are connected through a pipeline circulation, the effluent end of the CASS biochemical reaction unit (2) is connected to the effluent disinfection unit (3), and the sludge end of the CASS biochemical reaction unit (2) is connected to the sludge storage unit (6).
2. A sludge reduction treatment system based on CASS process according to claim 1, characterized in that: The pretreatment unit (1) comprises a sewage lifting pump, a screen, and a sedimentation tank connected in sequence; the sludge storage unit (6) is a sludge storage tank; and the effluent disinfection unit (3) is a disinfection tank.
3. A sludge reduction treatment system based on CASS process according to claim 2, characterized in that: The CASS biochemical reaction unit (2) is a CASS pool, and the BSR reaction unit (4) is a bio-enhanced inactivation reactor constructed with a multi-oxidation potential high entropy alloy chip.
4. A sludge reduction treatment system based on CASS process according to claim 3, characterized in that: The temporary bacterial culture unit (5) is a movable container-type steel structure bacterial culture pool with a submersible flow propeller installed therein.
5. A sludge reduction treatment system based on CASS process as claimed in claim 4, characterized in that: Control valves are respectively provided on the pipeline between the CASS biochemical reaction unit (2) and the BSR reaction unit (4), the pipeline between the temporary bacterial culture unit (5) and the BSR reaction unit (4), and the pipeline between the CASS biochemical reaction unit (2) and the temporary bacterial culture unit (5).