The worlds four major rural sewage treatment methods
The rural sewage treatment system has developed rapidly in the world in recent years. The environmentally-friendly sewage treatment system of Kinglv is also advancing with the times. By continuously improving the sewage treatment equipment by referring to the advanced sewage treatment systems of various countries. Here is a brief introduction to the sewage treatment systems of various countries.
German - split sewage treatment system
The more common rural sewage treatment method in Germany is the split sewage treatment system. The system is a decentralized municipal infrastructure system that builds advanced membrane bioreactors in remote rural areas that do not have access to drainage networks. The rainwater and sewage are collected separately and then purified by advanced membrane bioreactors.
The second split sewage treatment method is the PKA wetland sewage treatment system. The process mainly uses rural domestic sewage to pass through the water pipeline, collects and flows into the sedimentation tank, and is filtered through the 4 layers of the sedimentation tank, and then purified by PKA wetland, and then discharged to the standard or used for farmland irrigation.
In addition, the diversity sewage treatment system has also been applied. The main principle is to separate the sewage into rainwater, grey water and black water.
American - high-efficiency algae pond system, dispersed sewage treatment system
The high-efficiency algae pond is an improved version of the traditional stable pond. The removal rate of COD, BOD5, ammonia nitrogen and pathogens is high, and the higher aquatic plants harvested can be used as fertilizer. The advantage of high-efficiency algae ponds is the small amount of construction work, low investment and operating costs, and easy management and maintenance.
Dispersed sewage treatment systems are widely used in rural areas of the United States. This technology is often used in communities or villages with low population density, because the sewage treatment plants that transport these domestic sewage to a remote centralized sewage treatment plant will require extra high costs. .
In addition, in recent years, many scattered households have also applied automatic wells and underground septic tanks to treat sewage. Through a deep sewage well and underground water pipe, the solid or semi-solid matter in the domestic sewage is settled at the bottom of the well, and the settled sewage is used to irrigate the grassland.
French - earthworm ecological filter
The French have used the phlegm-drinking function of organic matter to improve the permeability of soil and the synergistic effect of earthworms and microorganisms to develop an ecological filter. This sewage treatment technology has high efficiency of decontamination and reduces the amount of excess sludge. .
The ecological filter treatment system integrates the primary sedimentation tank, the aeration tank, the secondary sedimentation tank, the sludge return equipment and the aeration equipment, which greatly simplifies the sewage treatment process. The advantage is that the impact load is strong, the operation management is simple, and it is not easy to block.
Japanese - purification tank technology
Japan's urban sewers are famous all over the world, while in the Japanese rural areas, the septic tank method is mostly used. The septic tank technology is of great significance in the treatment of Japan's decentralized domestic sewage. There are three main modes of domestic sewage in rural Japan, namely, household purification tanks, village drainage facilities and collective dormitory treatment facilities. Japan's septic tank technology is mainly used in remote areas where the drainage network cannot cover and the sewage cannot be included in the centralized facilities for unified treatment. The basic principle is to use the principle of soil and paddy field to purify the natural sewage, imitate the self-cleaning function in the material circulation process in nature, and add working filler to natural materials such as fallen leaves, decayed wood, charcoal and stone.Use microorganisms to adsorb and decompose harmful substances in sewage.