Device for physico-chemical-biochemical combined treatment of old-aged landfill leachate

Abstract

The invention discloses a device for physico-chemical-biochemical combined treatment of old-aged landfill leachate. The device comprises a leachate tank, a water pump, a water distributor, a mineralized waste reaction bed, a ventilation pipe and a collection pipe, wherein the leachate tank is connected with the water pump, the water distributor is arranged at a water outlet of the water pump, the mineralized waste reaction bed is placed below the water distributor, and the mineralized waste reaction bed is sequentially provided with a uniform water distribution layer, an iron scrap layer, a zeolite layer, a water collection layer, a mineralized waste layer and a supporting layer from top to bottom. The device disclosed by the invention can reduce the loading of organic matters, improve the biochemistry of the old-aged landfill leachate and be conductive to the follow-up biological treatment by utilizing the physico-chemical action of the iron scrap-zeolite layer against the old-aged landfill leachate; mineralized waste is utilized to perform biochemical treatment on the old-aged landfill leachate, so that the removal rate of COD (chemical oxygen demand), BOD5 (biochemical oxygen demand 5), ammonia nitrogen, total nitrogen and total phosphorus is high, and the emission standard can be achieved; the device disclosed by the invention can realize resource utilization of the mineralized waste, no secondary pollution and great economic benefits, social benefits and ecological benefits.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and relates to a device for combined physicochemical-biochemical treatment of aged landfill leachate. Background technique [0002] Sanitary landfill technology for domestic waste is one of the most widely used urban waste treatment methods, and the treatment of the resulting landfill leachate is an important part of the normal operation of the landfill. At present, the commonly used treatment methods for landfill leachate include: biological method, chemical oxidation method, flocculation sedimentation method, recharge method, artificial wetland method, etc. It has a good treatment effect, but the treatment effect on old landfill leachate (produced by landfill with a long age) is very poor. Implementation, domestic waste landfills are faced with huge pressure to treat high-standard discharge of landfill leachate, and the treatment of old landfill leachate is even more difficult. ...

AI Technical Summary

Problems solved by technology

At present, the commonly used treatment methods for landfill leachate include: biological method, chemical oxidation method, flocculation sedimentation method, recharge method, artificial wetland method, etc. It has a good treatment effect, but the treatment effect on old landfill leachate (produced by landfill with a long age) is very poor. Implementation, domestic waste landfills are facing enormous pressure to treat high-standard discharge of landfill leachate, and it is more difficult to treat old landfill leachate

Compared with the early landfill leachate, the old landfill leachate also has the characteristics of complex composition, high salt content, large chroma, high ammonia nitrogen, and poor biodegradability. It is difficult to effectively remove the refractory organic pollution in it by direct biological treatment. substances, and too high ammonia nitrogen will also have adverse effects on biological treatment

Adsorption, membrane technology and chemical oxidation are currently the main methods used to remove refractory organic matter from "middle-aged and old" landfill leachate, but they are often difficult to accept in economically underdeveloped areas due to their high cost and energy consumption.

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