Constructed Rapid Deep Filtering System
Constructed Rapid Deep Filtering System（(referred to as CRI)） is the deep improvement and optimization of the percolation land treatment system, which inherits the advantages of the rapid percolation land treatment system and overcomes its shortcomings at the same time. It is a brand-new sewage treatment system developed by Chinese technicians after years of research. It can be used for centralized treatment of urban sewage, can be used to treat scattered urban sewage, but also can be used for contaminated river water treatment and sewage treatment depth.
Constructed Rapid Deep Filtering System belongs to the biological membrane method in sewage treatment. There are abundant biofilms growing on the surface of the filter material. When the sewage flows and percolates into the filter material, the biofilm formed by the high specific surface area of the filter material is used to biodegrade the organic pollutants.
Less investment in infrastructure construction, about 1000 RMB per cubic meter of water (excluding land levy), about half of the investment in conventional activated sludge process.
It covers a moderate area, has a high hydraulic load (generally 1m2/d), has a large impact load resistance, can effectively control sludge expansion and the growth of filamentous microorganisms, the system has a high process stability.
No secondary sedimentation tank, simple process flow.
The treatment process does not require aeration and backwashing equipment.
There is no disposal problem of surplus sludge. Except for a very small amount of sludge produced in the pretreatment primary sedimentation tank, no activated sludge is generated, which saves the facilities and costs for the treatment of activated sludge and reduces its impact on the environment.
The use of artificial construction, flexible, not limited by site conditions, not because of leakage caused by groundwater pollution.
The operation cost is low, the direct operation cost of each side of water is about 0.2 yuan/m3, and it is easy to manage, operate and maintain.