Method for processing film filtration concentrated solution of domestic refuse percolate treatment

A technology for domestic waste and treatment methods, applied in chemical instruments and methods, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc., can solve problems such as high cost, reduced heat transfer efficiency, and increased treatment cost , to achieve the effect of convenient, feasible and low-cost processing method

Inactive Publication Date: 2008-09-17
北京水气蓝德科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

2. The COD is high, and the main component of COD in the concentrate is refractory organic matter; generally, the COD of the concentrate is between 1000 and 3000mg / l depending on the region and the eating habits of local residents.
4. Poor biodegradability: the organic matter in the concentrate is mainly refractory components, and it is difficult to provide nutrients for microorganisms
5. Has a strong odor
The disadvantages of infinite backflow are obvious. As time accumulates, the amount of refractory organic matter that flows back into the regulating tank accumulates more and more, and this refractory organic matter cannot provide nutrients for microorganisms, resulting in the loss of leachate. The biochemical properties are getting worse and worse, so that the function of the entire biological treatment system in the leachate treatment process is gradually reduced until it is defunctionalized
The second is evaporation concentration or activated carbon adsorption treatment. The cost of this method is extremely high, usually 200 to 300 yuan / ton. If evaporation treatment is used, the entire evaporation system has to consider the problem of high temperature corrosion protection, and with the use of time The growth of the heat transfer efficiency due to the fouling of the equipment has seriously decreased, and the treatment cost has further increased; the biggest problem facing the activated carbon treatment concentrate is the regeneration of activated carbon, which makes the cost remain high
This method takes the adsorption of organic matter by anti-pollution resin as the main treatment method. Judging from the existing anti-pollution ion exchange resin, no resin that can be used under the condition of refractory organic matter concentration for a long time without being polluted has been found. It has been reported at home and abroad that the common domestic and foreign ion exchange resins (whether macroporous or gel) are used under high COD conditions, the working exchange capacity will drop sharply, and the protective layer is easily penetrated by COD. At the same time, through The treatment of the concentrated solution adsorbed by the ion exchange resin and the regeneration waste liquid after the resin is saturated (usually the regeneration waste liquid is about 10% of the treatment capacity) is a more difficult problem, so the reliability of this method needs to be tested, and it is worthy of recognition It is good for the reduction of concentrate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Determination of embodiment 1 potassium permanganate optimal addition amount and reaction time

[0032] The optimum pH value for potassium permanganate to oxidize organic matter is around neutral, although potassium permanganate is most oxidative under acidic conditions. Generally, the pH of the concentrated solution produced by membrane filtration is between 6 and 9, and there is no need to adjust the pH before adding potassium permanganate. The dosage of potassium permanganate and the determination of the optimal reaction time are limited by the following factors: due to concentration The production, treatment and discharge of liquid are a process of dynamic equilibrium. The whole treatment process requires that the residence time of catalytic oxidation should not exceed 1.5 hours; at the same time, the dosage of potassium permanganate should also take into account oxidation, coagulation and precipitation The filtered final discharge water cannot have purple or pink c...

Embodiment 2

[0038] The selection of the optimal dosage condition of embodiment 2 sodium hypochlorite and chlorine dioxide

[0039] According to the different mechanisms of action of sodium hypochlorite and chlorine dioxide on organic matter and the influence of organic matter in the concentrate and other inorganic salts, adding chlorine dioxide after sodium hypochlorite reacts with the organic matter in the concentrate to a certain extent can ensure the synergistic oxidation of sodium hypochlorite and chlorine dioxide The chromaticity of the final effluent is basically no, and COD can be reduced to the lowest value within a certain period of time. In the reverse selection experiment, chlorine dioxide is added before sodium hypochlorite. The COD of the selection experiment is much lower than that of the reverse selection experiment. Therefore, the order of synergistic oxidation is that sodium hypochlorite should be added before chlorine dioxide is added, and the sodium hypochlorite can have...

Embodiment 3

[0044] Example 3 Determination of the conditions of coagulation and sedimentation and the compatibility of coagulants and flocculants

[0045] The flocculant uses the Hoffman reaction of modified polyacrylamide. According to the experiment, we added 10% calcium chloride or magnesium chloride to the Hofmann reaction of polyacrylamide. After adding calcium or magnesium chloride, the effect of COD after coagulation and precipitation is better than that without adding, and the removal rate of COD is increased by 20%. The specific method for modifying the Hoffman reactant of polyacrylamide is: mix the Hoffman reactant of polyacrylamide with 0.5% solution, then weigh 10% calcium chloride or magnesium chloride by weight of polyacrylamide and dissolve in It can be used after it has been prepared in the flocculant and kept at 40°C for 2 hours. Polyferric sulfate is selected as the coagulant. According to the pH range of polyferric sulfate, it is determined by the pH before and after c...

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PUM

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Abstract

The invention relates to a method for treating membrane filtration concentrate in household garbage leachate treatment, comprising the following steps of: (1) adding potassium permanganate to the concentrate for pretreatment; (2) sequentially adding sodium hypochlorite and chlorine dioxide into the concentrate after pretreatment with time interval of 1 hour, and stirring; (3) adjusting pH of the concentrated treated by step (2) to 11, and adding coagulating agent and flocculating agent; and (4) filtering the liquid treated by step (3).

Description

technical field [0001] The invention relates to the field of environmental protection, in particular, the invention relates to a method for treating the membrane filtration concentrated liquid in the treatment of domestic garbage leachate. Background technique [0002] In the landfill leachate treatment process, the current mainstream treatment process at home and abroad is microbial treatment + membrane filtration. The concentrate produced in the membrane filtration process has the following characteristics: 1. The output of the concentrate is large; the output of the new membrane concentrate within half a year is 30-40% of the water inflow to the membrane, and the output of the membrane concentrate for more than half a year is 30% of the membrane It is about 50% of the water inflow, and this amount will increase as the membrane usage time increases. 2. The COD is high, and the main component of COD in the concentrate is refractory organic matter; generally, the COD of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/72C02F1/52
Inventor 施军营毛小军许士雄费成志
Owner 北京水气蓝德科技有限公司
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