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

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...

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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