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Method for treating ammonia nitrogen in garbage percolate by combining biological and chemical processes

A technology of landfill leachate and combined treatment, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of increasing the cost of chemical use, high ammonia nitrogen content, and high power consumption, etc. Achieve excellent adaptability and operability, prolong reaction time, and improve the effect of current density

Inactive Publication Date: 2011-02-09
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

(6) High content of ammonia nitrogen
The ammonia nitrogen in the leachate has been effectively removed, but it has not been able to stably meet the water pollutant discharge concentration limit of 25mg / L and The special discharge limit is 8 mg / L; and hydrochloric acid is used to adjust the pH during the treatment process, which increases the cost of chemical use; and the direct use of electrolysis to treat high-concentration organic wastewater consumes a lot of electricity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The joint treatment process in this example is a combination of a traditional SBR reactor and a two-dimensional electrode electrochemical reactor.

[0028] Take the leachate from a municipal landfill, the main water quality index is: COD Cr 1715mg / L, ammonia nitrogen 1765mg / L, Cl - 2070 mg / L, pH 8.0, the wastewater enters the SBR reactor for treatment, the effective volume of the reactor is 10L, the daily treatment water volume is 3.5L, the operation cycle is 24h, the operation mode is: instantaneous water intake, aeration for 8h, stirring for 3h, Aerate for 6 hours, stir for 5 hours, settle for 1.5 hours, and drain for 0.5 hours. The mixed liquid suspended solids (MLSS) in the reactor is 3800mg / L, the dissolved oxygen DO in the aerobic stage is 1.0~2.0mg / L, and the dissolved oxygen in the water is controlled at 0.0~0.2mg / L in the anoxic stirring stage. The biochemical effluent quality is: ammonia nitrogen 520 mg / L, pH 8.8. Take 0.2L of SBR effluent and enter the ele...

Embodiment 2

[0030] The combined treatment process in this example is a combination of an SBR reactor with built-in membrane modules and a three-dimensional electrode electrochemical reactor.

[0031] Take the leachate from a municipal landfill, the main water quality index is: COD Cr 6325 mg / L, ammonia nitrogen 1269 mg / L, Cl - 2075 mg / L, pH 8.8. The wastewater enters the SBR reactor for treatment. The SBR system has a built-in polyvinylidene fluoride (PVDF) membrane module, and the water is pumped out. The effective volume of the reactor is 12L, the daily water treatment volume of SBR is 4L, and the operation cycle is 12 hours. / L, DO: 1.0~2.0mg / L in the aerobic stage, and the dissolved oxygen in the water is controlled at 0.0~0.2mg / L in the anoxic stirring stage. The biochemical effluent quality is: ammonia nitrogen 102 mg / L, pH 8.2. Take 1L of SBR effluent into the electrocatalytic oxidation reactor for treatment, using a three-dimensional electrode reactor (according to a certain...

Embodiment 3

[0033] The joint treatment process in this example is a combination of SBR reactor with built-in filler and two-dimensional electrode electrochemical reactor.

[0034] Take the leachate from a municipal landfill, the main water quality index is: COD Cr 2495 mg / L, ammonia nitrogen 1680 mg / L, Cl - 2046 mg / L, pH8.5, the wastewater enters the SBR reactor for treatment, and the SBR system has a built-in volcanic rock biological filter material. The effective volume of the reactor is 7L, the daily treatment water volume of SBR is 2L, and the operation cycle is 24 hours. , the MLSS in the reactor is 3300mg / L, the DO in the aerobic stage is 1.0~2.0mg / L, and the dissolved oxygen in the water is controlled at 0.0~0.2mg / L in the anoxic stirring stage. The biochemical effluent quality is: ammonia nitrogen 516 mg / L, pH 8.6. Take 0.2L of SBR effluent and enter the electrocatalytic oxidation reactor for treatment. The electrolytic cell is a 50mm×50mm×100mm transparent organic glass tank...

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Abstract

The invention discloses a method for removing ammonia nitrogen from urban garbage percolate, which belongs to the field of waste water treatment. The method comprises: a sequencing batch reactor (SBR) biochemical treatment process and an electro-catalytic oxidization process in turn, wherein the percolate is introduced into an SBR reaction tank for biochemical denitrogenation, the oxygen dissolved in water in an aeration phase is kept between 1.0 and 2.0mg / L, the aeration time is 4 to 8 hours, the oxygen dissolved in water in a stirring phase is kept between 0.0 and 0.2mg / L and the stirring time is 2 to 6 hours; and the effluent of SBR enters an electro-catalytic oxidization reactor, the current intensity is kept between 40 and 50mA / cm<2>, and the reaction time is 1.5 to 2 hours. The method of the invention is suitable for the standard treatment of urban garbage percolate in all phases, avoids producing secondary pollution, adopts a flexible, simple and convenient operation mode and has a promising industrial application prospect.

Description

technical field [0001] The invention relates to a treatment method for urban garbage leachate, in particular to a method for removing ammonia nitrogen in urban garbage leachate, and belongs to the field of wastewater treatment. Background technique [0002] Landfill leachate refers to the sewage filtered out through extraction, hydrolysis and fermentation due to rainwater leaching, scouring, surface water and groundwater immersion in the process of garbage stacking and landfilling. Overall, the leachate has the following characteristics: (1) The concentration of organic matter is high. (2) Contains a variety of metals. (3) The proportion of nutrients is out of balance, and the phosphorus content of landfill leachate is usually low. (4) The water quality changes greatly, and it will change with the season, climate, length of landfill years, and the type and quantity of garbage. (5) Contains a large amount of chloride ions. (6) High content of ammonia nitrogen. Leachate a...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F9/14C02F1/461
Inventor 张晖冉晓妮吴小刚张俊李艳丽张道斌
Owner WUHAN UNIV
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