Landfill percolate treatment novel process

Abstract

The invention relates to a landfill percolate treatment novel process method, which comprises the following steps: (1) collecting and gathering the landfill percolate into a regulating tank; (2) lifting the outlet water of the regulating tank to enter an ammonia stripping reaction vessel; (3) carrying out coagulating sedimentation treatment on the landfill percolate after ammonia stripping; (4) making the outlet water of the coagulating sedimentation enter an anaerobic reaction vessel for carrying out anaerobic treatment; (5) sequentially making the outlet water of the anaerobic reaction vessel enter an anoxic tank, an aerobic tank and an MBR reaction tank, wherein mixed liquid carries out back flowing from the MBR reaction tank to the anoxic tank, a membrane assembly used in the MBR reaction vessel is a flat plate MBR film assembly, and the MBR has the form of the submerging form; and (6) making the outlet water of the MBR reaction tank enter a reverse osmosis system, directly discharging the treated outlet water, and making reverse osmosis concentrated solution flow back to the regulating tank. The invention aims at the water quality features of the landfill percolate, reasonably combines the physicochemical treatment and biological treatment unit, and has the advantages of short and compact process flow, high treatment efficiency, low energy consumption, long service life of the membrane assembly and the like.

Description

technical field [0001] The invention relates to a new process for treating landfill leachate. Background technique [0002] Sanitary landfill treatment of garbage has the characteristics of small investment, low operating cost, simple operation equipment, and can handle various types of garbage. It is the most important way of garbage treatment in cities in my country at present and in the future. However, there is a very critical problem in the sanitary landfill method, that is, the collection and treatment of landfill leachate. Landfill leachate is a kind of high-concentration organic wastewater leached out due to fermentation, rainwater washing, surface water and groundwater immersion in the process of garbage stacking and landfilling. [0003] Treatment methods for landfill leachate include physical, chemical and biological methods. The load of landfill leachate is very high, and the treatment is difficult. It is difficult to meet the treatment requirements with one me...

AI Technical Summary

Problems solved by technology

Due to the high concentration of ammonia nitrogen has a certain inhibitory effect on the biological treatment system, and the high concentration of ammonia nitrogen causes C / N imbalance in the leachate, biological denitrification is difficult, and the final effluent is difficult to meet the standard

② Poor process adaptability

With the extension of landfill time, the nutrient elements are seriously out of balance, the leachate C / N decreases, the biodegradability decreases, and the impact load resistance is poor

At present, another domestic landfill leachate treatment main process is DT-RO reverse osmosis process, but in this process, the core product reverse osmosis membrane module is monopolized by foreign products, the price is expensive, the one-time construction investment is higher than the biological method, and the operating cost is high

If the pre-treatment effect is not good, the concentration of sewage pollutants entering the reverse osmosis system is high, increasing the treatment pressure of the membrane, easily causing membrane pollution, increasing the cleaning and replacement costs of the membrane, and failing to reach the set treatment efficiency

In addition, the pollutants have not been effectively removed and concentrated in the concentrate, causing secondary pollution

[0005] Chinese patents disclose some new technical solutions for landfill leachate treatment, among which the patent number is 2006100345178 and the title is "A Method for Landfill Leachate Treatment", which discloses a method for treating landfill leachate using MBR. Before the leachate enters the membrane bioreaction tank, it needs to use two-stage contact oxidation for aerobic treatment. According to its instructions, an intermediate sedimentation tank is required between the aerobic treatment and the membrane bioreaction tank. The membrane bioreaction tank also includes anaerobic zone, contact In fact, the landfill leachate not only undergoes denitrification + nitrification reaction in the two-stage contact oxidation step, but also undergoes denitrification + nitrification reaction in the membrane bioreaction tank. The technical solution can only achieve the treatment effect as described in the manual, so the technical solution has a long process flow, requires more various reaction tanks, occupies a large area, and requires a large investment. The leachate treated in the pond is further treated, which has failed to meet the requirements of the "Pollution Control Standards for Domestic Waste Landfill Sites" (GB16889-2008)

Another patent application No. 2009100847445 titled "A Treatment Process and Device for Landfill Leachate" also discloses a method for treating landfill leachate using a submerged membrane bioreactor. The landfill leachate is treated by denitrification, coagulation and other processes, and the landfill leachate contains a large amount of suspended solids, colloidal particles or other impurities. Since they have not been removed through corresponding steps, the sewage is treated with submerged membrane biology. , a large number of suspended solids, colloidal particles or other impurities will be adsorbed on the membrane module, which reduces the treatment efficiency and service life of the membrane module, and increases the treatment cost

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