1、 Overview of Processing Facilities
The main pollutants in most domestic sewage are pathogenic microorganisms and toxic and harmful physical and chemical pollutants. Various water treatment technologies and equipment can be used to remove various physical, chemical, and biological pollutants from water, purify water quality, meet national or local water pollutant discharge standards, and protect water resources, environment, and human health. However, due to treatment technology and management reasons, some domestic sewage stations cannot achieve stable and compliant discharge of sewage, which is far from the prescribed discharge standards. Therefore, based on years of research, the pre installed A-level biochemical tank (hydrolysis biochemical tank) - biological contact oxidation process has been successfully used to treat this type of domestic sewage. This process has the advantages of strong load resistance, good phosphorus and nitrogen removal treatment effect, high degree of automation in operation and management, and the use of buried type with less land occupation and beautiful appearance.
Integrated specialized treatment equipment for domestic sewage, designed to be buried underground. This equipment combines the properties of domestic sewage and adopts the world's advanced biological treatment process, integrating the removal of BOD5, COD, NH3-N, and bacteria. It is currently the most efficient domestic sewage treatment equipment. It is widely used for domestic sewage treatment in various residential areas and industrial water treatment with water quality similar to domestic sewage, replacing ordinary physical and chemical methods and biochemical treatment methods with low removal rates and treated effluent that cannot meet national discharge standards. Through application, it has been shown that the buried integrated domestic sewage special treatment equipment is a device with ideal treatment effect and convenient management.
The sewage treatment tank and buried equipment are designed to be located below the surface, with greenery above the surface. Therefore, the sewage treatment plant does not affect the overall environment and deepening requirements of the surrounding area.
2、 Design Basis
1. The effluent quality of wastewater discharge shall meet the third level discharge standard of GB18918-2002 "Comprehensive Wastewater Discharge Standard";
2. The emission of odorous gases shall comply with the "Emission Standards for Odor Pollutants" (GB14554-93);
3. Noise emissions shall comply with the "Industrial Enterprise Boundary Noise Standard" (GB12348-90);
4. The discharge of waste residue shall comply with the "Trial Standards for Industrial 'Three Wastes' Discharge" (GBJ-73);
5. The sludge shall comply with the "Control Standards for Pollutants in Agricultural Sludge" (GB4284-84).
3、 Wastewater treatment process
1. The process flowchart is as follows:
2. The cross-sectional diagram of the equipment is as follows:
3. Equipment process
The buried integrated sewage treatment equipment adopts a carbon steel structure, with the box installed underground and a maintenance manhole left above. Composition of the box: hydrolysis acidification tank (Class A tank), secondary biological contact oxidation tank, secondary sedimentation tank, sludge tank, etc.
This sewage treatment device is controlled by a controller, and the operation of the equipment is completely controlled automatically (switchable to manual control mode). It can complete the opening and closing of water pumps and fans and automatic switching, and is equipped with overvoltage, phase loss, short circuit and other protection and alarm functions.
4. Engineering characteristics
This project has the following characteristics:
4.1. The entire processing system has a high degree of automation, is easy to operate, manage, stable and reliable, and the system is stable.
4.2. The use of integrated specialized equipment for domestic sewage is a major feature. The A-level biochemical tank can not only degrade a considerable amount of COD and intercepted suspended solids, but also play an important role in improving the biodegradability of sewage, degrading high molecular weight organic matter, reducing the difficulty of subsequent treatment, and digesting residual sludge in the reflux.
4.3. The complete set of equipment includes all power equipment from well-known brands, with excellent equipment quality, low operating power costs, reliable quality, and stable operation.
4.4. The system adopts an underground design, and the greening above the equipment does not affect the environment.
4、 Anti noise measures
The fan room is designed outside the integrated buried equipment, using low-noise and vibration free fans. The fan inlet is equipped with a filter and muffler, and the outlet is connected to a soft joint and muffler. The machine is equipped with anti vibration rubber and anti vibration frame.
5、 Measures for treating foul odors
The main source of exhaust gas pollution in this project is odor pollution. The odor emission sources include inlet grille ditch, regulating tank, sedimentation tank, oxidation tank, sludge tank, etc. Odor is a mixture of multiple gases, mainly composed of H2S, NH3, and methyl mercaptan. In order to ensure that the odor does not affect the surrounding environment during system operation, the domestic sewage equipment is designed to be buried underground to reduce the emission of odor. And strengthen greening and beautification around the sewage treatment facilities, build a mixed forest isolation zone of trees and shrubs, which is conducive to reducing the impact of odors on the environment and beautifying the surrounding environment.
6、 Process Introduction
The discharged sewage is collected by the drainage system and enters the grid well for sewage treatment, where floating debris and particulate matter are removed. It then enters the pre settling and regulating tank for sedimentation of large particles and average sewage volume. The signal is then transmitted through the liquid level control instrument and pumped to the A-level biological tank. Denitrification is carried out in an anaerobic state using organic matter as a carbon source to remove nitrate nitrogen and reduce organic matter concentration. Finally, it flows into the O-level biological contact oxidation tank for aerobic biochemical reactions, where the vast majority of organic pollutants are degraded through biological assimilation, synthesis, and heterotrophic decomposition, killing harmful bacteria in the water before being filtered and treated for reuse.
The debris intercepted by the grille is regularly loaded into a small car and dumped into the garbage dump. The sludge in the secondary sedimentation tank is partially retained in the A-level biological treatment tank, while the other part is pumped to the sludge tank for aerobic digestion and regularly pumped out for transportation.
7、 Process performance characteristics
1. The shell of the sewage treatment equipment is made of carbon steel.
2. The A-level biological treatment tank is equipped with high-efficiency biological elastic packing and has hydrolysis and acidification functions. It can also be adjusted into a biological oxidation tank to increase the biochemical retention time and improve treatment efficiency.
The filling material in the O-grade biochemical tank adopts a three-dimensional mesh composite filling material, which has a large specific surface area, a long service life, and is prone to film formation, corrosion resistance, and blockage. The filling material can freely stretch and diffuse in water, cutting the bubbles in the water in multiple layers, which relatively increases the aeration effect and oxygen utilization rate. The installation, disassembly, and inspection of the filling material in a cage style are convenient.
4. The aeration pipeline in the pool is made of high-quality ABS pipes, which are corrosion-resistant. The aeration head adopts an efficient membrane type microporous aeration head, which is non clogging and has a high oxygen utilization rate.
5. The fan design uses a high-pressure fan, which has the characteristics of small size, low noise, sufficient air volume, stable and reliable performance.
Our company adopts internationally advanced biological treatment technology. Based on summarizing the operating experience of domestic sewage treatment equipment and combining our own scientific research achievements and engineering practice, we have designed a complete set of organic wastewater treatment equipment that can be buried underground. It integrates the removal of BOD5, COD, and NH3-N, with stable and reliable technical performance, good treatment effect, low investment, automated operation, and easy maintenance and operation.
The process flow of this equipment is tested for the treatment and reuse of all machine wastewater. The wastewater treated by this equipment meets the national discharge standards. Our company can also provide reclaimed water reuse equipment according to user requirements. The water quality standards after treatment by this equipment are shown in the table below (Comprehensive Wastewater Discharge Standard GB18918-2002 Level III Discharge Standard):
project
Inlet water volume (mg/L)
Water output (mg/L)
BOD5
100~200
≤60
CODcr
200~400
≤120
SS
200~450
≤50
PH
6~9
6~9
8、 Equipment process design
1. Design the treatment process plan for the sewage based on the sewage treatment capacity.
2. Equipment process design requirements:
(1) Strictly implement the current national environmental protection technology standards and specifications, and comply with relevant laws and regulations on environmental protection at the national and local levels.
(2) Selecting advanced, reasonable, and reliable treatment processes, while ensuring compliance with emission standards, to achieve simple operation, convenient management, minimal land occupation, low investment, and low operating costs:
(3) This project is an environmental engineering, and special attention should be paid to environmental protection, avoiding and reducing secondary pollution, improving labor hygiene conditions, and implementing the policies of safe production and clean and civilized production.
(4) In order to improve the management level of sewage treatment plants, the design adopts a high degree of automation and low labor intensity for operators.
(5) Reasonably select high-quality accessories, reduce energy consumption, improve work efficiency and trial life, and lower costs.
(6) In process design, there is great flexibility and adjustability to test the periodic changes in water quantity and quality, improving the flexibility and variability of the system.
(7) Adopting the sludge pre reflux digestion process to reduce the amount of sludge generated.
(8) Adapt to local conditions, layout reasonably, and effectively utilize space.
9、 Scope of Supply
The equipment and components are as follows:
Serial number
name
Specification and model
quantity
remarks
one
Integrated domestic sewage main unit with reverse filtration device
HD-WSZA/O—2
6000*1700*1700
1 unit
Q235 plain carbon steel plate, double filter layer, asphalt anti-corrosion coating
two
Roots Blower
WSR-50
1 unit
General air volume/low energy consumption
three
Oxidation tank aeration system
Micropore/Constant Pore
Multi layered aeration head
Φ215, Φ150
15m³
Ordinary packing bracket
Conventional fillers
four
Disinfection device
HD-XD-50－L
1 set
Chlorine dioxide generator
five
Sewage lift pump
50SQW—11—1.5
1 unit
N=1.5kw outsourcing
six
Dosing device
HD-WL-2
1 unit
seven
Sludge reflux pump
ZW30—10
1 unit
N=1.5kw outsourcing
eight
Manual control box
400*500*200
1 unit
Manual/without PLC
nine
Pipeline, valve
50-80 pipe fittings
1 batch
10、 Equipment quotation
name
Processing capacity
quantity
size
remarks
Integrated underground sewage treatment
100m³/d
one
10*2*3m
Carbon steel anti-corrosion
Total equipment price: 238000 yuan (including tax and shipping)
Note: The minimum footprint of integrated equipment is 20 square meters
11、 Transportation and Packaging
1. Electrical and instrumentation equipment should be strictly packaged to ensure that they are not damaged during transportation and storage, and to prevent moisture.
2. All exposed parts and components shall be equipped with protective devices and measures to prevent damage during transportation and storage.
12、 After sales service
1. The quality assurance plan shall be implemented according to the following points:
a. The inspection and control of the supplier's supply sources strictly comply with the ISO9000 international quality system certification standards, ensuring that the quality of the supplied sources is excellent and qualified. At the same time, relevant documents for the inspection and control of the supply sources are well prepared.
b. On site construction shall be supervised according to relevant standards.
2. Inspection and testing content of equipment production process.
2.1. All equipment shall be properly controlled and inspected during the production process, and factory inspections, tests, and on-site tests shall be conducted in a timely manner according to the work schedule to confirm that materials, processes, and performance meet the standard requirements adopted.
2.2. Inspection and testing work shall be carried out in the factory.
2.3. When the inspection and testing at each stage cannot meet the standards, specifications, and performance requirements, the supplier shall make timely adjustments, modifications, and supplements until the requirements are met and approved by the purchaser.
2.4. The inspection and testing plan developed by the supplier includes the following items:
Non destructive testing of welds.
b. Hydrostatic test.
3. Actively cooperate with users, environmental protection departments, and relevant design institutes to conduct scheme demonstration and design, and do
Good pre-sales service.
4. Provide personnel training services to users free of charge.
5. Provide free and timely system equipment layout drawings, equipment manufacturing drawings, installation drawings, etc.
6. Regularly conduct user visits, actively solicit opinions, solve problems, improve work, and optimize
Ensure the supply of spare parts first.
7. During equipment installation and debugging, timely dispatch experienced technicians and workers to the site
Guide installation and debugging.
8. After the warranty period expires, our company will provide free technical consultation for the product and be responsible for production
Repair the product and provide spare parts at a discounted price.
9. Our company provides users with 24/7 and all-round services. If users call or write to us, we guarantee
Please reply within 12 hours or arrive at the scene as soon as possible.
10. During the equipment installation and debugging period, our company strictly controls the equipment installation and dispatches technical personnel
On site service, timely handling of manufacturing quality issues that arise on site and outsourcing to supporting manufacturers
Feedback quality information, propose service requirements, and urge supporting manufacturers to send personnel to the site in a timely manner
Handle quality issues.
11. During the use of the equipment, our company is able to promptly provide users with any quality issues
Technical service requirements: Within the quality assurance period, our company shall promptly provide notification after the user sends it out
Provide maintenance services, free repair or replacement of damaged parts and components to ensure the normal operation of the equipment
function.
12. The equipment warranty period is one year.
13. After the warranty period, the product will be provided with lifelong paid maintenance and repair.
