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Pretreatment method and equipment for physical and chemical deamination of garbage leachate

A landfill leachate and pretreatment technology, which is applied in the treatment of polluted groundwater/leachate, chemical instruments and methods, degassed water/sewage treatment, etc., can solve the problem of high energy consumption of ammonia nitrogen, avoid secondary pollution, The effect of reducing processing cost and realizing resource utilization

Inactive Publication Date: 2019-10-25
中节能工程技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a pretreatment method and equipment for physical and chemical deamination of landfill leachate, which is used to solve the problem in the prior art that it is necessary to adjust the pH value of landfill leachate with soda lime before blowing off ammonia nitrogen, and at the same time, the ammonia nitrogen recovery process consumes a lot of energy.

Method used

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  • Pretreatment method and equipment for physical and chemical deamination of garbage leachate
  • Pretreatment method and equipment for physical and chemical deamination of garbage leachate

Examples

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Embodiment 1

[0046] figure 1 The equipment diagram for the high-efficiency physical and chemical deamination pretreatment of landfill leachate provided for this example, as figure 1 As shown, the equipment specifically includes:

[0047] (1) Pretreatment unit: comprising a connected waste water regulating settling tank 1 and a carbonate decomposition aid storage tank 2, the waste water regulating settling tank 1 is provided with a feed pump 3, and the carbonate decomposition aid storage tank 2 is composed of The dosing pump 4 is regulated, and the effluent of the wastewater regulating sedimentation tank enters the negative pressure evaporation unit through the flow meter 5 and the wastewater heat exchanger 6 .

[0048] (2) Negative pressure evaporation unit: comprising a negative pressure evaporation tower 9, its upper water inlet is connected to the wastewater regulating sedimentation tank 1, the inside is equipped with a filler 7, a distributor 8 is provided, a vacuum pump 12 is install...

Embodiment 2

[0053] figure 2 The process flow diagram of the high-efficiency physical and chemical deamination pretreatment of landfill leachate provided for the embodiment, as figure 2 As shown, the technological process mainly includes the following steps:

[0054] (1) Transport the landfill leachate to the pretreatment unit to realize solid-liquid separation, and add carbonate decomposition aids to the supernatant;

[0055] (2) Transport the supernatant of the pretreatment unit to a negative pressure evaporation unit, perform negative pressure evaporation until the pH of the supernatant is greater than 9, and transport the liquid evaporated under negative pressure to the ammonia stripping unit.

[0056] (3) The gas after the ammonia stripping and the gas after the negative pressure evaporation are sent to the ammonia recovery unit.

[0057] Specifically, combined with figure 1 The equipment diagram of high-efficiency physical and chemical deamination pretreatment of landfill leacha...

Embodiment 3

[0063] A landfill leachate wastewater, composition and concentration: NH 3 -N is 1500~2000mg / L, pH is 8~8.5, utilizes the equipment of the present invention to carry out ammonia nitrogen removal pretreatment steps as follows:

[0064] 1) Pump the landfill leachate into the wastewater regulating sedimentation tank for sedimentation, add carbonate decomposition additives to the supernatant, the addition amount is 10ppm, and then exchange heat with the effluent of the negative pressure evaporation tower to about 60°C.

[0065] 2) The pretreated wastewater enters the upper part of the evaporation tower and is evenly distributed by the liquid distributor. The heating temperature at the bottom of the tower is about 80°C; turn on the vacuum pump to vacuum the evaporation tower under negative pressure. The operating pressure is -0.06MPa, containing carbonate decomposed CO 2 The evaporated tail gas of ammonia and ammonia enters the bottom of the ammonia absorption tower after passing ...

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Abstract

The invention provides a pretreatment method and equipment for physical and chemical deamination of garbage leachate. The pretreatment method comprises the following steps of (1) conveying the garbageleachate to a pretreatment unit, realizing solid-liquid separation, and adding a carbonate decomposition assistant to supernatant; and (2) conveying the supernatant of the pretreatment unit to a negative pressure evaporation unit to conduct negative pressure evaporation until the pH of the supernatant is greater than 9, and conveying liquid after the negative pressure evaporation to an ammonia blow-off unit. According to the pretreatment method and equipment, the carbonate decomposition assistant is added to the garbage leachate to be simultaneously matched with the negative pressure evaporation to realize effective removal of ammonia nitrogen in the garbage leachate without the need of consumption of alkali to adjust the pH value of the garbage leachate; through optimization of absorption process and the structure of the equipment, the gas-liquid ratio is controlled to be 500-2000 to 1 during ammonia blow-off, energy consumption is reduced, at the same time, cooling crystallization and separation for rich liquid are directly conducted, and energy consumption is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a pretreatment method and equipment for physical-chemical deamination of landfill leachate. Background technique [0002] With the rapid development of my country's economy and urbanization, people's living standards continue to improve, resulting in a large amount of urban domestic waste. Sanitary landfill is the main disposal measure of domestic waste in my country. In recent years, with the increasingly stringent environmental protection requirements, the proportion of waste incineration power generation has been increasing year by year. However, these two disposal measures will generate a large amount of landfill leachate during the disposal process. . Landfill leachate is a high-concentration organic wastewater with complex properties and difficult to treat. It has the characteristics of high COD, high ammonia nitrogen, high salt and toxicity. If it is not t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10B01D53/18B01D53/14C01C1/12C02F101/16C02F103/06
CPCB01D53/18B01D53/14C01C1/12C02F1/20C02F1/04C02F1/66C02F2301/08C02F2101/16C02F2103/06
Inventor 邱明建赵贤广郭智杨世慧
Owner 中节能工程技术研究院有限公司
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