Refuse incineration plant leachate treatment process

Abstract

The invention relates to a leachate treatment process of a waste incineration plant, comprising the following steps: 1) introducing the landfill leachate into a grid grit chamber to remove suspended solids and sediment in the leachate; 2) overflowing the leachate into the regulating tank Stirred by the submersible mixer; 3) The leachate in the adjustment tank enters the primary sedimentation tank; 4) The overflow of the leachate after sedimentation in the primary sedimentation tank enters the UASB reactor; 5) The effluent of the UASB reactor overflows to the facultative tank, and then 6) The supernatant of the secondary sedimentation tank overflows into the coagulation and flocculation tank, and after removing SS and CODCr in the clear liquid, it is pumped to the membrane treatment system by water pump; 7) The clear water entering the membrane treatment system passes through the supernatant After filtration and nanofiltration, it enters the clean water well and discharges directly. The invention adopts comprehensive physical and biochemical methods to process the landfill leachate, can process high-indicator sewage, improves the quality of effluent water, has good device operation stability, and reduces operating costs.

Description

technical field [0001] The invention relates to a process for treating leachate of a waste incineration plant, and belongs to the technical field of landfill leachate treatment. Background technique [0002] Chinese patent CN2832807Y discloses a method for treating landfill leachate in domestic waste incineration plants. The method includes a pretreatment system with a leachate storage tank, a centrifugal dehydration device connected to the leachate storage tank through a water pump, and an intermediate water pool connected to the centrifugal dehydration device, a membrane bioreactor with a bioreactor, and an ultrafiltration device connected through a water pump. A reactor, a membrane bioreaction system of an ultrafiltration device connected by a water pump, a disc tube reverse osmosis system having a water storage tank connected to the ultrafiltration device, and a disc tube reverse osmosis device connected to the water storage tank through a water pump. Methods Sealed cen...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: 1. The water produced cannot meet the standard in Table 3 of the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008); 2. The biochemical system is too simple, and the removal rate of ammonia nitrogen is only 50%; 3. , Use a centrifugal dehydrator to separate the raw water from solid to liquid, wasting energy

The disadvantages of this process are: 1. The water produced reaches the first-class standard in the "Integrated Wastewater Discharge Standard" (GB8978-1996), which is outdated and lower than the "Pollution Control Standard for Domestic Garbage Landfills" (GB16889 -2008) table 3 standard

3. Refractory pollutants accumulate in the system, making it difficult for the system to operate stably for a long time

The disadvantages of this process are: 1. The MBR system of this process adopts submerged membrane biological treatment. Since the leachate belongs to high-concentration sewage, it is easy to cause the submerged ultrafiltration membrane to be blocked. Once this happens, compared with the external tube Submerged ultrafiltration membrane, troublesome maintenance of submerged ultrafiltration membrane

2. Concentrated water produced by reverse osmosis membrane and nanofiltration membrane will return to the water quality and water volume adjustment steps, which will lead to a sharp increase in salt in the system, and a sharp increase in the conductivity of the inlet of the reverse osmosis system. The rise in conductivity will lead to reverse osmosis The osmotic pressure of the system increases, and the water production rate decreases rapidly until the membrane system cannot produce water

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