Method for processing garbage leachate and device thereof

Abstract

The invention relates to a device for processing a garbage leachate and a method thereof. The device comprises three systems, namely a humidification system, a dehumidification system and a heat pump system. According to the method, a garbage leachate is pumped to the top of a humidifier tower, is sprayed onto the surface of a filler through a liquid distributor and is directly contacted with countercurrent air which enters the bottom of the tower to undergo air humidification; moist air enters an evaporator in the heat pump system, a refrigerant in the evaporator absorbs heat in steam, and the steam is condensed and discharged; and the refrigerant which has been vaporized by absorbing heat flows through a compressor and heats the leachate in a liquid storage device by the use of heat carried with the refrigerant in a condenser. In comparison with an existing method, the method provided by the invention has advantages of simple equipment, short flow and easy operation, can be adopted to effectively slow down corrosion and scaling of equipment, has strong adaptability and is not limited by factors such as age limit of the garbage leachate, rainfall in the outside environment, biodegradability and the like. By the method and the device, energy sources are saved, and effluent quality is easy to meet emission requirements.

Description

technical field [0001] The invention relates to the technical field of landfill leachate treatment, and specifically provides a method and device for treating landfill leachate. Background technique [0002] During the process of dumping and landfilling garbage, due to anaerobic fermentation, decomposition of organic matter, leaching and scouring of precipitation, immersion in groundwater, etc., a variety of metabolites and water are produced, forming a waste product containing high concentrations of suspended solids and high concentrations of organic or inorganic waste. components of landfill leachate. The leachate contains a large amount of organic matter, heavy metals and high-concentration organic matter, and the content of ammonia nitrogen is high, which will cause serious pollution to the atmosphere, rivers, groundwater, surface water, and soil. [0003] The fundamental reason why landfill leachate is difficult to treat is that it contains humic acid that is difficult...

AI Technical Summary

Problems solved by technology

[0003] The fundamental reason why landfill leachate is difficult to treat is that it contains humic acid that is difficult to biodegrade and high concentration of ammonia nitrogen. The methods to deal with these two types of substances are either not effective or costly

At present, most landfill leachate treatment processes have the following two problems: the treatment effect of the more economical process cannot meet the standard requirements, such as biological treatment, the investment and operation costs are relatively low, but in general The water quality of the effluent after downstream treatment cannot meet the standard; technically, the process that can handle the standard is usually poor in economy, such as membrane treatment, the investment and operation costs are high, and the concentrated solution of the original solution needs to be further processed, and more The operating cost of activated carbon adsorption and chemical oxidation process to treat landfill leachate is basically unaffordable

The evaporation methods mentioned above all need steam as the heat medium for evaporation, the heating temperature is high, most of them belong to indirect heat transfer, the equipment is prone to scaling and corrosion, the energy consumption is relatively large, and the cost is high

Moreover, the content of ammonia nitrogen in the effluent quality of the existing evaporation method is relatively high, and the condensed water still needs further treatment

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