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Pulse electrochemical process for removing ammonia-nitrogen in landfill leachate

A landfill leachate and electrochemical technology, applied in the field of water pollution treatment, can solve the problems of poor biodegradability of landfill leachate, C/N ratio imbalance, high manufacturing cost of catalytic electrodes, etc. The effect of chemical corrosion rate reduction and reasonable electrochemical corrosion rate

Active Publication Date: 2013-06-19
中钢集团武汉安全环保研究院有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] One is the problem of high concentration of ammonia-nitrogen in landfill leachate: the concentration of ammonia-nitrogen in landfill leachate is generally 200-5000mg / L, and there are a few landfill leachate containing ammonia-nitrogen above 5000mg / L
Due to the high concentration of ammonia-nitrogen has a certain inhibitory effect on the biological treatment system, and at the same time, the high concentration of ammonia-nitrogen causes the C / N ratio in the landfill leachate to be out of balance, making it difficult to carry out biological denitrification, resulting in difficulty in the ammonia-nitrogen index of the final effluent. up to standard
[0005] The second is the problem of poor biodegradability of landfill leachate: Generally speaking, nearly 500-600mg / L of CODcr in landfill leachate cannot be treated by biotechnology
The electrochemical treatment method is more suitable as a pretreatment before biological treatment, but the electrocatalytic oxidation method still has the problems of high manufacturing cost and short life of the catalytic electrode, which need to be solved
Numerous studies have shown that the measures to promote the high efficiency and practicality of electrochemical treatment methods are the first to use pulse power supplies, but the development of high-power, low-frequency pulse power supplies has been slow due to the complexity of development

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] It is very difficult to treat the leachate of old landfill plants. Firstly, the frequency conversion pulse electrochemical process is used for treatment, which can greatly remove ammonia-nitrogen, improve the C / N ratio of landfill leachate, and effectively improve its biodegradability. Then follow-up biochemical system processing. The process route is: landfill leachate→frequency conversion pulse electrochemical process→anaerobic treatment→A / O biological treatment→advanced treatment→standard discharge. The main parameters of process influent and effluent are shown in Table 1

[0044] Table 1 Influent and effluent parameters of aged leachate process

[0045] project

[0046] After the old landfill leachate is treated by frequency conversion pulse electrochemical process, more than 90% of ammonia-nitrogen is removed, and BOD 5 / CODcr reaches 0.27, and then the subsequent anaerobic + A / O biochemical system continues to process, ammonia-nitrogen can reach the d...

Embodiment 2

[0048] The treatment object in Example 2 is the early landfill leachate, and the treatment difficulty is relatively small. The technical route is: landfill leachate→anaerobic treatment→A / O biological treatment→frequency conversion pulse electrochemical process→standard discharge; The main parameters of process influent and effluent are shown in Table 2

[0049] Table 2 Influent and effluent parameters of early leachate process

[0050] project

CODcr (mg / L)

NH 3 -N (mg / L)

Leachate Raw Water

13600

1210

Leachate effluent after biochemical treatment

798

47

Water effluent after frequency conversion pulse electrochemical treatment

6

[0051] The effluent CODcr 798mg / L, NH 3 -N 47mg / L, CODcr and NH 3 -N removal effect is good, and after the frequency conversion pulse electrochemical process, the water NH 3 -N 6mg / L.

[0052] The early leachate of the landfill plant is relatively less difficult to tr...

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Abstract

The invention relates to a variable-frequency pulse electrochemical process for removing ammonia-nitrogen in landfill leachate. Variable-frequency pulse electrochemical pretreatment is carried out before anaerobic biological treatment and aerobic biological treatment or variable-frequency pulse electrochemical deep treatment is carried out after the anaerobic biological treatment and the aerobic biological treatment; the variable-frequency pulse electrochemical treatment adopts a variable-frequency pulse electrochemical device which comprises an electrobath and a variable-frequency pulse power supply connected with an electrode plate of the electrobath, wherein the variable-frequency pulse power supply is arranged in a power cabinet, the input end of the variable-frequency pulse power supply is externally connected with a three-phase power of 380V / 50Hz, the output ends are used for guiding out anode and cathode which are respectively connected with the positive pole and the negative pole of the electrode plate of the electrobath, and a control panel of the power cabinet is provided with frequency, voltage and current adjusting buttons. Due to the adoption of the variable-frequencypulse electrochemical process, the ammonia-nitrogen removal rate can reach 70-100 percent, and the effluent of the landfill leachate with the unit electricity consumption of 4-8 kwh / m<3>, which is treated by the full process line, has the NH3-N content less than 6 mg / L and reaches the emission standard of national municipal solid waste landfill pollution control standard of GB16889-2008.

Description

technical field [0001] The invention relates to the technical field of water pollution treatment, in particular to a frequency conversion pulse electrochemical process for removing ammonia-nitrogen in landfill leachate. Background technique [0002] Landfilling is the main method of municipal solid waste disposal in my country at this stage. After the organic waste in domestic garbage enters the landfill, it undergoes physical and chemical and biodegradation reactions, coupled with the infiltration of rainwater, surface water and groundwater into the landfill, it produces a high-concentration suspended solids, high-concentration organic and inorganic waste. Composition of the liquid, that is, landfill leachate. [0003] Over the past ten years, foreign scholars have conducted a lot of exploration and research on the treatment of landfill leachate, and obtained some successful experiences, some of which have been used in engineering practice. Our country has gained some val...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 徐国平熊昌贵张怀松董有涂晓波李闪熊斌李建军袁兵张懿
Owner 中钢集团武汉安全环保研究院有限公司
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