Today, the number of small cities and towns, suburban living areas, resorts, and villas in our country is relatively large and distributed. It is a new strategic goal after the sewage treatment in large and medium-sized cities. Therefore, the in-situ treatment of dispersed sewage that cannot be absorbed into the urban centralized pipe network not only can effectively control the point source pollution, but also can easily realize the recycling of the sewage.
The small-scale integrated sewage treatment plant is like a small-scale sewage treatment plant. The grids, primary sedimentation tanks, biochemical pools, sedimentation tanks, disinfection tanks and other structures are closely connected. The core structures are generally biological contact oxidation tanks, MBR, Biological turntable, biological fluidized bed, A/O, A2/O, etc. Compared with large-scale sewage treatment systems, integrated equipment has the advantages of high processing efficiency, low energy consumption, low sludge production, convenient management, and small footprint. Therefore, the integrated equipment has been widely used in the field of sewage treatment, and in the new situation, it has irreplaceable advantages:
(1) Small capital investment. Large investment in large-scale sewage treatment plants is under pressure, and the total investment of integrated equipment is very small. The market price ranges from tens of thousands to hundreds of thousands, and it is suitable for small-capital funds such as real estate properties and small factories. This is more in line with China's "pollution, who govern" principle of pollution control.
(2) Relieve the pressure on the construction of municipal pipe network. The construction of large-scale sewage treatment plants often requires supporting the construction of a large-scale municipal pipe network system. The construction of a sewage treatment plant in a place where the network of small residential areas, scenic areas, factories, etc. are underdeveloped is neither convenient nor economical. It is more appropriate to use integrated equipment in this case. In addition, for the diversion and drainage system, the smaller flow of sewage can be directly discharged into the rainwater pipeline or water body after treatment with the integrated equipment, without increasing the pressure of the sewage pipeline.
(3) Effectively save construction area. The construction of a sewage plant will inevitably occupy a large area of ​​land and destroy the ecology. With the progress of urbanization, the land is becoming increasingly tense. The integrated equipment has high processing efficiency, and can be buried in the ground. It does not occupy the ground surface area and does not affect the overall layout and environment of the building group.
(4) Effectively realize the reuse of water and save water. The major obstacle for large-scale sewage treatment plants to carry out the water treatment is also to lay a huge waterway pipe network. The integrated equipment can be configured more flexibly. Usually, the drainage point is also the point where the water is reused, which can completely eliminate the construction of the middle waterway. With the improvement of China's water reuse requirements, integrated equipment will show greater advantages.
Integrated sewage treatment equipment
It is expected that the research direction of the small-scale integrated sewage treatment equipment in the future will be the recycling of sewage treatment, that is, the process of reusing the sewage after deep treatment. In a small-scale integrated wastewater treatment facility, we can recycle the treated wastewater through methods such as improving the treatment unit and increasing the advanced wastewater treatment module. Through practice, it has been shown that the following points should also be taken into consideration when recycling waste water:
1. Improve biochemical treatment Traditional biochemical treatment methods require lower effluent standards, and the process will become very complicated after the standards are improved. Now, the development of the MBR process has solved this problem. Through the MBR process, the sewage can meet the first-grade emission requirements after biochemical effluent, and the treatment structure in the latter stage is relatively simple.
2. Add advanced processing module, which is similar to the method of water supply treatment. In practical applications, flocculation, sedimentation, sand filtration, micro-flocculation, filtration, and membrane technology are often used to solve the problem.
3. To solve the problem of sludge treatment, the sludge composting technology can be introduced to reduce the sludge, or a mobile vehicle-mounted sludge treatment device can be used to centralize the sludge recovery generated by scattered small-sized sewage treatment equipment. .
4. In practical applications, most of these devices are mass-produced and do not specifically design the water quality. For buried treatment facilities, it is impossible to observe the internal processing conditions. Even if there are detection instruments, it may not reflect the real situation. Situation, and maintenance trouble, resulting in the actual effluent effect is not ideal. What's more, some companies cut corners and cut materials to save costs. For example, 8mm steel plates were used to make the outer walls. However, the outer wall thickness did not reach 8mm, and the inner wall thickness was 6mm. Then the anticorrosion was performed and the equipment life was short, causing the industry to treat small sewage. Handling equipment queries. At this point, the environmental protection companies should reflect on their perspectives and put their sights on the long-term, make truly high-quality, high-efficiency equipment, and develop the road for the development of small-scale integrated equipment.
The research and application of small-scale integrated wastewater treatment systems have achieved certain results and have been gradually promoted in China. The new treatment system based on an efficient bioreactor has the characteristics of high treatment efficiency, convenient construction and installation, light weight, high strength, good effluent quality, and water recyclability, and can be flexibly adapted to specific water quality requirements. Its good economic and environmental benefits have been comprehensively embodied, and it is an effective way to solve the problems of sewage treatment and environmental protection. The relevant research will continue to deepen, and it has broad prospects in the field of engineering applications and theoretical research.
The small-scale integrated sewage treatment plant is like a small-scale sewage treatment plant. The grids, primary sedimentation tanks, biochemical pools, sedimentation tanks, disinfection tanks and other structures are closely connected. The core structures are generally biological contact oxidation tanks, MBR, Biological turntable, biological fluidized bed, A/O, A2/O, etc. Compared with large-scale sewage treatment systems, integrated equipment has the advantages of high processing efficiency, low energy consumption, low sludge production, convenient management, and small footprint. Therefore, the integrated equipment has been widely used in the field of sewage treatment, and in the new situation, it has irreplaceable advantages:
(1) Small capital investment. Large investment in large-scale sewage treatment plants is under pressure, and the total investment of integrated equipment is very small. The market price ranges from tens of thousands to hundreds of thousands, and it is suitable for small-capital funds such as real estate properties and small factories. This is more in line with China's "pollution, who govern" principle of pollution control.
(2) Relieve the pressure on the construction of municipal pipe network. The construction of large-scale sewage treatment plants often requires supporting the construction of a large-scale municipal pipe network system. The construction of a sewage treatment plant in a place where the network of small residential areas, scenic areas, factories, etc. are underdeveloped is neither convenient nor economical. It is more appropriate to use integrated equipment in this case. In addition, for the diversion and drainage system, the smaller flow of sewage can be directly discharged into the rainwater pipeline or water body after treatment with the integrated equipment, without increasing the pressure of the sewage pipeline.
(3) Effectively save construction area. The construction of a sewage plant will inevitably occupy a large area of ​​land and destroy the ecology. With the progress of urbanization, the land is becoming increasingly tense. The integrated equipment has high processing efficiency, and can be buried in the ground. It does not occupy the ground surface area and does not affect the overall layout and environment of the building group.
(4) Effectively realize the reuse of water and save water. The major obstacle for large-scale sewage treatment plants to carry out the water treatment is also to lay a huge waterway pipe network. The integrated equipment can be configured more flexibly. Usually, the drainage point is also the point where the water is reused, which can completely eliminate the construction of the middle waterway. With the improvement of China's water reuse requirements, integrated equipment will show greater advantages.
Integrated sewage treatment equipment
It is expected that the research direction of the small-scale integrated sewage treatment equipment in the future will be the recycling of sewage treatment, that is, the process of reusing the sewage after deep treatment. In a small-scale integrated wastewater treatment facility, we can recycle the treated wastewater through methods such as improving the treatment unit and increasing the advanced wastewater treatment module. Through practice, it has been shown that the following points should also be taken into consideration when recycling waste water:
1. Improve biochemical treatment Traditional biochemical treatment methods require lower effluent standards, and the process will become very complicated after the standards are improved. Now, the development of the MBR process has solved this problem. Through the MBR process, the sewage can meet the first-grade emission requirements after biochemical effluent, and the treatment structure in the latter stage is relatively simple.
2. Add advanced processing module, which is similar to the method of water supply treatment. In practical applications, flocculation, sedimentation, sand filtration, micro-flocculation, filtration, and membrane technology are often used to solve the problem.
3. To solve the problem of sludge treatment, the sludge composting technology can be introduced to reduce the sludge, or a mobile vehicle-mounted sludge treatment device can be used to centralize the sludge recovery generated by scattered small-sized sewage treatment equipment. .
4. In practical applications, most of these devices are mass-produced and do not specifically design the water quality. For buried treatment facilities, it is impossible to observe the internal processing conditions. Even if there are detection instruments, it may not reflect the real situation. Situation, and maintenance trouble, resulting in the actual effluent effect is not ideal. What's more, some companies cut corners and cut materials to save costs. For example, 8mm steel plates were used to make the outer walls. However, the outer wall thickness did not reach 8mm, and the inner wall thickness was 6mm. Then the anticorrosion was performed and the equipment life was short, causing the industry to treat small sewage. Handling equipment queries. At this point, the environmental protection companies should reflect on their perspectives and put their sights on the long-term, make truly high-quality, high-efficiency equipment, and develop the road for the development of small-scale integrated equipment.
The research and application of small-scale integrated wastewater treatment systems have achieved certain results and have been gradually promoted in China. The new treatment system based on an efficient bioreactor has the characteristics of high treatment efficiency, convenient construction and installation, light weight, high strength, good effluent quality, and water recyclability, and can be flexibly adapted to specific water quality requirements. Its good economic and environmental benefits have been comprehensively embodied, and it is an effective way to solve the problems of sewage treatment and environmental protection. The relevant research will continue to deepen, and it has broad prospects in the field of engineering applications and theoretical research.
Finishing Mill Rolls
Description: Used for early finishing stand and late finishing stand (Wire mill, steel rod mill, steel bar mill). With a high wear-resistant properties and anti-crack, anti-peeling, anti-prints capacity. These types of roll ensure that the plats surface quality and dimensional accuracy.
Material: Bainitic nodular cast iron , high speed steel, carbides or as per the customer`s requirement.
Barrel Diameter: 700mm maximum
Unit weight: 10mt/pc
Type: Single rolls, double pouring cast rolls.
Casting: Static casting, centrifugal casting
Heat treatment: annealing, normalizing, quenching, and tempering.
Finishing Mill Rolls
Finishing Mill Rolls,Bainitic Nodular Cast Iron Rolls,High Speed Steel Rolls,Carbides Rolls
Shijiazhuang BKDR Metallurgical Science & Technology Co.,Ltd , https://www.bkdrtech.com