Against the backdrop of increasingly scarce water resources, the reuse of municipal sewage has become an important way to relieve water pressure. And efficient pretreatment equipment is the key to ensuring the quality of reclaimed water. The multimedia filters produced by Xinxiang Lifeierte Filter Corp.,LTD, with their unique technical advantages and stable performance, have been successfully applied in multiple municipal sewage treatment and reuse projects. The following takes the actual project of a certain city's sewage treatment plant as an example to introduce the application of our company's multimedia filters in detail.
I. Project Background
A certain city's sewage treatment plant undertakes the task of treating 100,000 tons of domestic sewage per day in the urban area. The original pretreatment process adopted single grid filtration and grit chamber sedimentation. The treated sewage still contained a large amount of suspended solids, colloids, sediment and other impurities, with a turbidity as high as 30 NTU, failing to meet the inlet requirements of subsequent advanced treatment units. Under such water quality conditions, advanced treatment equipment such as reverse osmosis membranes was frequently blocked, and their service life was greatly shortened, resulting in high replacement costs. At the same time, the quality of the treated reclaimed water was unstable, making it difficult to meet the standards for urban non - potable water use (such as road cleaning, greening irrigation, etc.), resulting in the sewage reuse rate remaining below 30% for a long time. In order to improve the sewage treatment effect and increase the sewage reuse rate, the sewage treatment plant decided to upgrade the pretreatment equipment. After market research and technical evaluation, it finally selected the multimedia filters of our company.
II. Application and Implementation of Our Company's Multimedia Filters
(I) Equipment Selection and Customization
The technical team of our company customized a large - scale multimedia filter system according to the treatment scale of the sewage treatment plant, the characteristics of the inlet water quality, and the requirements of subsequent advanced treatment processes. The system consists of 8 parallel filter units. Each single filter has a diameter of 3 meters and a height of 5 meters, with a designed treatment flow rate of 450 cubic meters per hour. The filter media adopt a scientific grading combination. From top to bottom, they are anthracite filter media (particle size 0.8 - 1.2mm, thickness 400mm), quartz sand filter media (particle size 0.5 - 0.8mm, thickness 600mm), and magnetite filter media (particle size 0.2 - 0.5mm, thickness 200mm). This grading method can effectively intercept impurities of different particle sizes, achieve layered filtration, and improve the filtration efficiency and effect.
(II) System Installation and Debugging
Equipment Installation
The multimedia filters were installed in the designated location of the pretreatment workshop of the sewage treatment plant, and the inlet pipes, outlet pipes, backwash pipes, and sewage discharge pipes were connected. Each filter is equipped with an independent valve control system, which can realize operations such as independent operation and backwashing, facilitating equipment maintenance and management.
Configuration of Backwash System
An efficient backwash system was designed, adopting the air - water combined backwash method. The backwash air source is provided by a roots blower, with an air pressure of 0.05 - 0.08MPa; the water source is the treated reclaimed water, with a water pressure of 0.2 - 0.3MPa. The backwash process includes three stages: air wash, air - water mixed wash, and water wash, which can effectively remove the impurities intercepted in the filter media layer and restore the filtration performance of the filter media.
Debugging and Optimization
The professional technicians of our company conducted a two - week debugging of the system, adjusting the time parameters of backwashing (air wash for 3 minutes, air - water mixed wash for 5 minutes, water wash for 7 minutes), flow parameters, etc., to ensure the best backwash effect. At the same time, parameters such as the turbidity and pressure of the inlet and outlet water during the filter operation were monitored. According to the actual situation, fine adjustments were made to the height and grading of the filter media layer to ensure the stable and efficient operation of the equipment. And comprehensive operation training and maintenance guidance were provided for the operators of the sewage treatment plant.
III. Application Effects
Effect Category | Specific Performance |
Significant Improvement in Pretreatment Effect | - The inlet turbidity was reduced from 30 NTU to below 5 NTU, effectively removing more than 90% of the suspended solids and sediment in the sewage, providing high - quality inlet water for subsequent advanced treatment- The colloid removal rate reached 85%, reducing the pollution risk of subsequent reverse osmosis membranes and other equipment |
Reduction in Equipment Operation Costs | - The replacement cycle of reverse osmosis membranes was extended from the original 6 months to 18 months, saving about 1.2 million yuan in membrane replacement costs annually- The service life of the filter media of the multimedia filter is as long as 5 - 8 years. Compared with traditional single - media filters, the replacement cycle is extended by 2 - 3 times, reducing the labor and material costs of filter media replacement- The air - water combined backwash method saves 30% of water compared with single water backwash, saving about 100,000 tons of backwash water annually and reducing water costs |
Substantial Increase in Sewage Reuse Rate | - After pretreatment by the multimedia filter, combined with subsequent advanced treatment processes, the quality of the reclaimed water fully meets the standards for urban non - potable water use. The sewage reuse rate has increased from the original less than 30% to 65%, and about 2.3725 million tons of water can be reused annually, effectively relieving the urban water pressure |
IV. Summary of Application Experience
Scientific Filter Media Grading is the Core
The reasonable combination of different types and particle sizes of filter media to form a layered filtration structure is the key to the efficient operation of multimedia filters. Our company customizes exclusive filter media grading schemes according to the characteristics of the inlet water quality of the project, ensuring that the filters can give full play to their filtration efficiency.
Efficient Backwash System is the Guarantee
The air - water combined backwash method can more thoroughly remove the impurities in the filter media layer and maintain the stable filtration performance of the filter. Reasonably setting parameters such as the pressure, time, and flow rate of backwashing is crucial for extending the service life of the filter media and reducing operation costs.
Professional After - Sales Service is the Support
Our company provides comprehensive after - sales services for customers, including equipment installation and debugging, personnel training, regular inspections, and technical support. We promptly solve the problems encountered by customers during the use process, ensuring the long - term stable operation of the equipment and winning high recognition from customers.
The successful application of our company's multimedia filters in this municipal sewage treatment and reuse project fully demonstrates the reliability and advancement of the products. In the future, [Company Name] will continue to optimize the technology of multimedia filters, providing higher - quality and more efficient solutions for municipal sewage treatment and more water treatment fields.
