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Deep treating method of sewage, such as percolate for urban refuse filling area

A landfill, advanced treatment technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc.

Inactive Publication Date: 2005-02-16
TONGJI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

According to the current research results, the energy consumption of removing 1kg of CODcr in landfill leachate by electrolysis is generally greater than 40kw.h. Such energy consumption limits the application of this method in actual engineering, so how to reduce the energy consumption of electrolysis The question is the key to whether the law can be widely used

Method used

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Embodiment Construction

[0009] Adjust the pH of the landfill leachate that has undergone pretreatment (biological method or mineralized garbage recharge) to an acidic (pH value of 2 to 4) range with industrial pickling waste, and add FeCl 2 , FeSO 4 , FeCl 3 or Fe 2 (SO 4 ) 3 etc., the concentrations are 500mg / L, 1000mg / L, 2000mg / L, 2500mg / L, etc., and then use electrolytic cells with insoluble anodes for electrolysis, and the current density is 5mA / cm 2 、15mA / cm 2 、30mA / cm 2 、40mA / cm 2 Wait, electrolysis for 20-60 minutes. Industrial waste lye, NaOH, Ca(OH) for effluent after electrolysis 2 etc., adjust the pH to be neutral (pH value is 6-7), and the supernatant can be discharged up to the standard. The ferric salts precipitated by adjusting the pH are dissolved in industrial pickling waste liquid and returned to the electrolysis reactor for reuse, so as to avoid the problem of sludge dehydration. Since the iron salt can be recycled in the process of sewage treatment, there is only a small...

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Abstract

Belonging to the field of environment protection, the invention relates to an approach of deeply processing percolate of landfill of refuse field and other sewages. Through adjusting PH value of percolate, add iron salt and use electrobath with a water-fast anode to conduct electroanalysis. Adjust the PH value of percolate to neutrality, deposit iron ion and the deposited iron can be used circularly. After the treatment, CODcr chroma of supernatant is less than 250mg / L which can reach discharging standard grade 2 of percolate. It can reach grade 1 that chroma is less than 10 times and chroma of NH3-N is less than 10mg / L. The invention remarkably reduces electricity consumption and reaches the level of engineering application.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an advanced treatment method for leachate and other sewage in landfill sites. Background technique [0002] At present, the disposal of urban waste is still dominated by sanitary landfill. The leachate produced in the landfill is a kind of high-concentration, multi-component organic wastewater. The large fluctuation of water quality and quantity is its important feature. Therefore, the leachate The treatment of it has always been a worldwide problem. [0003] At present, landfill leachate treatment includes biological method, physicochemical method and land treatment method. Due to the high concentration of pollutants in landfill leachate, from the perspective of technology and economy at the current stage, it is impossible to solve the problem only by using physical and chemical methods, and physical and chemical methods can only be used as a means ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 徐迪民禇衍洋
Owner TONGJI UNIV
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