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3 Slow percolation (SR system)
Slow infiltration is a method in which wastewater is added to the surface of the soil where crops are grown, and the wastewater is fully purified in the runoff surface soil and plant system
.
The system is suitable for loam, sandy loam with good water seepage performance, and areas with low evaporation and humid climate; the wastewater is infiltrated vertically downwards slowly after sprinkler irrigation, and crops are planted on it
Figure 8-5 Slow infiltration system
Slow infiltration is suitable for sandy soil with good water permeability and areas with low evaporation and humid climate
.
Since the hydraulic loading rate is much smaller than that of rapid infiltration, the substances and nutrients in wastewater can be fully absorbed and utilized by crops, and the possibility of polluting groundwater is very small, so it is considered to be the most suitable method for land treatment
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4 Subsurface infiltration (SWIS system)
Underground infiltration is a land treatment process that effectively controls wastewater in a certain depth from the ground surface, with a certain structure and good diffusion properties.
Under the action of capillary infiltration and percolation of the soil, the wastewater moves to the surroundings and meets the treatment requirements
.
There are three types of underground infiltration treatment systems: natural filter ditch, underground capillary infiltration ditch and submerged biological filter-soil infiltration composite process
Figure 8-6 Underground infiltration treatment system
The underground infiltration land treatment system has attracted more and more people's attention because of its unique advantages
.
In foreign countries, the research and application of underground filter system has been paid more and more attention
The choice of the above four types of land infiltration systems should be based on the nature of the soil, topography, crop types, climatic conditions, as well as the requirements for wastewater treatment and the way out of the treated water.
A composite system consisting of several systems should be established if necessary to improve the treatment.
