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Method for removing total nitrogen in household garbage leachate

A technology for domestic waste and leachate, applied in the field of environmental protection, can solve the problems of high denitrification cost, high treatment cost and high water quality requirements, and achieve the effect of improving denitrification efficiency and improving the degree of denitrification

Inactive Publication Date: 2009-11-25
BIOLAND ENVIRONMENTAL TECH GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment effect of this method is stable, but the stripping tower is prone to fouling, which will cause secondary pollution
(2) Electrodialysis and reverse osmosis: These two methods have good denitrification effects, but they have high requirements on water quality and high treatment costs, so they are generally rarely used
2NH4+3HOCL==N 2 +3CL - +3H 2 O+5H + , but the processing cost is too high
(5) Chemical coagulation method: the effect of denitrification is not ideal, and the amount of sludge produced is relatively large. Generally, this method is not used alone for denitrification
(6) Clinoptilolite is commonly used as an ion exchanger for ammonia removal in the ion exchange method. Its selection of ammonia ions is better than that of calcium, magnesium, and sodium ions. The daily water treatment volume is 1000m 3 (NH in raw water 4 + -N concentration is 20mg / L), and the removal rate standard is 80%. The ammonia in the regeneration solution can be discharged into the atmosphere in the form of free ammonia or molecular nitrogen, and can also be used as fertilizer after being recycled into ammonia solution, but the cost of denitrification is high. Uneconomical, in addition, there are problems such as regeneration liquid treatment

Method used

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  • Method for removing total nitrogen in household garbage leachate
  • Method for removing total nitrogen in household garbage leachate
  • Method for removing total nitrogen in household garbage leachate

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Embodiment 1

[0025] A method for removing total nitrogen in domestic waste leachate, including denitrification treatment, nitrification treatment and endogenous respiration treatment, the temperature of denitrification treatment, nitrification treatment and endogenous respiration treatment is 30 ° C, and the C / N in denitrification treatment 3:1, the reflux ratio from nitrification to denitrification is 500%, and the reflux ratio from endogenous respiration to nitrification is 200%. The time of denitrification treatment is 2 hours, the time of nitrification treatment is 4 hours, and the time of endogenous respiration treatment is 4 hours. The removal rate of ammonia nitrogen in the effluent is 98%, and the removal rate of total nitrogen reaches 92%.

Embodiment 2

[0027] The effect of temperature on nitrification and denitrification speed is directly related to the type of reaction equipment and process conditions. Generally, the optimum temperature for nitrifying and denitrifying bacteria is 30°C. From figure 2 It can be seen that the removal rate of total nitrogen increases gradually with the increase of temperature, and there is no significant change in the removal of total nitrogen after 30 °C. The whole process can run stably without external heat source.

Embodiment 3

[0029] In the denitrification process, C / N will affect the proportion of nitrifying bacteria in activated sludge. Because nitrifying bacteria are autotrophic microorganisms, in the process of metabolism

[0030] No organic matter is needed, so the smaller the COD / TKN in the sewage, the easier the nitrification reaction will be. But the denitrification process is a process that requires a carbon source. Therefore, an appropriate carbon-nitrogen ratio is the key to determine the stable operation of the process. From image 3 It can be seen that when the carbon-nitrogen ratio is maintained at 3:1, the removal rate of the system can reach more than 92%. It can be seen that compared with the traditional denitrification process, the carbon-nitrogen ratio is relatively low, which can fully meet the low carbon-nitrogen ratio of landfill leachate. The status quo, without the need for additional carbon sources.

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Abstract

The invention provides a method for removing total nitrogen in household garbage leachate. The method comprises denitrification treatment, nitrification and endogenous respiration treatment, wherein the temperature of the denitrification treatment is 30 DEG C; the ratio of C to N in the denitrification treatment is 3:1; and the reflux ratio of the nitrification treatment to the denitrification treatment is 500 percent. The ammonia-nitrogen removal rate of the method can reach more than 98 percent, and the total nitrogen removal rate of the method can reach 90 percent.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular, the invention relates to a method for removing total nitrogen in domestic garbage leachate. Background technique [0002] The water quality of landfill leachate is extremely complex and the concentration of pollutants is high, so the treatment of leachate has always been a worldwide problem. Landfill leachate mainly comes from three aspects: (1) natural rainfall and runoff in the landfill; (2) the original water content of the garbage itself; (3) the anaerobic decomposition of microorganisms after the garbage landfill water. Among them, the precipitation in the landfill is the main part. When the water seeps through the garbage with complex components, it will cause the garbage to decompose, dissolve, ferment and other reactions, so that the leachate contains a large amount of organic pollutants, nitrogen, phosphorus and a wide variety of Heavy metal substances. [0003] ...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 施军营费成志乔如林王飞
Owner BIOLAND ENVIRONMENTAL TECH GRP CORP
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