Basic technology of landfill leachate treatment

Abstract

The invention discloses a fundamental technology for landfill leachate treatment. The fundamental technology for landfill leachate treatment comprises the steps of pre-stage assisting, a primary sewage treatment core process, middle-stage assisting, a secondary sewage treatment core process and post-stage assisting, the whole technological process is controlled based on the pH values of water bodies at process points, and various parameters can be set according to the requirements of water inlet and outlet indexes. The fundamental technology can fully guarantee the representative features and advantages of an ion separation agent of an applicant in practical application as following: the dosage is few (10-300 grams for per ton of water), dilution is not needed for direct solid feeding, sewage is treated in real time without temporary storage (the response speed is 3-15 minutes), the water content removal rate is above 80%, the fundamental technology can be in line with and meet various national sewage treatment and discharge indexes, treated water is colorless, odorless, free of secondary harmful chemical substances and flocculation, and produced sludge is low in moisture content (< 35%), free of foul smell, non-sticky and the like.

Description

technical field [0001] The invention relates to the field of sewage treatment technology and methods, in particular to a technology for treating landfill leachate. Background technique [0002] In recent years, with the development of population and economy, environmental problems have become increasingly serious, and our government and people have attached great importance to them. Among them, the problem of water pollution has become a more important problem among many environmental problems. Water pollution causes soil pollution, which in turn causes air pollution and destroys the overall ecological environment. The main sources of water pollution are domestic sewage and industrial sewage, among which domestic sewage has a large amount of water, while landfill leachate, although the amount of water is not large, is the difficulty and focus of domestic sewage, which is harmful to the human body and the environment. my country is a country with a large population and is un...

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Problems solved by technology

[0010] At present, landfill leachate treatment mainly uses three technical methods including physical method, chemical method and biological method; among them, physical method includes natural evaporation, good water dilution, ionization, reverse osmosis membrane, ultrafiltration, nanofiltration, etc., which require a large amount of The electricity energy, especially the operation and maintenance cost of membrane technology is quite expensive; and the chemical method is usually to add polymer oxidizers (iron oxide, Fenton, etc.) and chemical flocculants (such as polyacrylamide (PAM) or polymeric chlorine Aluminum (PAC)) etc.; however, the chemical flocculant has a large amount of dosing, good water dilution and ratio in advance, long-term static sedimentation, non-stirring, secondary chemical hazardous substances and high water content in sludge Disadvantages, there are inevitably relatively large problems in the actual process and operation; for example, the flocculation speed is slow, the water flow buffer and reaction supporting facilities occupy a large area, the waste of water resources and land is relatively serious, and secondary pollution to the water environment is formed. The biggest problem is that the use of chemical flocculants will bring great troubles to the sludge treatment it produces. Not only does it require a lot of electricity to drive the sludge filter press or centrifuge, but the sludge smells very smelly, and the sludge after treatment The moisture content is still as high as 60% or more

Biochemical methods are currently widely used, especially in domestic sewage treatment. Its advantages are stability, effectiveness, and low operating costs, but its limitation is that it cannot treat waste water with high concentrations of organic matter and high salt and other poor biodegradability. It is very difficult to domesticate and cultivate bacteria, and even some chemical wastewater can kill biochemically active bacteria; this is the reason why our country’s urban sewage treatment plants are still powerless against landfill leachate and industrial wastewater despite their large scale

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