Special film based treatment process for waste incineration plant leachate

Abstract

The invention discloses a special film based treatment process for waste incineration plant leachate. The process comprises: centralizing landfill leachate through a collecting pond; firstly carrying out coagulating sedimentation pre-treatment on the landfill leachate; carrying out preliminary treatment on the landfill leachate throng anaerobic microbes; then carrying out bio-treatment on the landfill leachate to remove almost organic pollutants and COD, thereby guaranteeing the inflow water quality for a SuperNF / RO system; and finally, discharging the effluent with a standard through the SuperNF / RO system, and evaporating and separating a concentrated solution. According to the invention, the problem that concentrated water is back-ejected to incinerate is avoided; the equipment is protected; the process is relatively simple; the cost is easy to control; and a film system is hardly polluted and blocked, is stronger in pollution resistance and good in system stability; so that the influence on biochemical treatment effect is effectively avoided to a certain extent; the service life of the film system is greatly prolonged; and meanwhile, biogas generated by anaerobic treatment provides energy supply to evaporation and separation of concentrated water for a biogas boiler, therefore the resource waste is avoided; the wastes are use; and the process is environmental-friendly and energy-saving.

Description

technical field [0001] The invention relates to the technical field of waste treatment, in particular to a leachate treatment process of a waste incineration plant based on a special membrane. Background technique [0002] The typical characteristics of domestic domestic waste are high content of kitchen waste, high moisture content, high content of organic matter, mixed collection, and relatively low calorific value. Therefore, in the design of domestic waste incineration plants, the storage capacity of the garbage pit is 3-7 days of garbage treatment; that is, the garbage is stored in the garbage pit and fermented and matured for 3-7 days to achieve the moisture content in the garbage. Leach out, thus producing landfill leachate. The water quality of this leachate is not up to standard, and it will pollute the environment if it is discharged directly to the environment, so it must be treated. [0003] After analysis and testing, the characteristics of the leachate water ...

AI Technical Summary

Problems solved by technology

Due to the high concentration of pollutants in the landfill leachate, the stability of the biochemical system is poor, and the biochemical system is easily affected by external factors, especially the anaerobic system is particularly sensitive to temperature

In winter, especially in northern regions, the biological activity of microorganisms decreases under low temperature conditions, resulting in low biochemical system treatment efficiency, and the COD of biochemical effluent often exceeds 1000mg / L, or even reaches 2000mg / L

The roll-type NF / RO has high requirements on the quality of the influent water and poor anti-pollution performance. Generally, the COD of the influent water is required to be less than 100mg / L. Even the special anti-pollution roll-type NF / RO requires less than 200mg / l. The COD index of the effluent has greatly exceeded the tolerance of the roll-type NF / RO. Although the discharge can meet the standard in the initial use, the membrane is easily fouled and the flux of the membrane decreases, which affects the treatment effect and the service life is short. The number of replacements is frequent, resulting in a significant increase in operating costs

Moreover, the recovery rate of roll-type NF / RO is low. Generally, the recovery rate of roll-type RO is less than 60%, and that of roll-type NF is less than 70%. processing request

Furthermore, the use of the concentrated water to spray back to the incinerator for incineration will not only affect the efficiency of incineration, but also the concentrated water with high salt content is very corrosive to the incinerator tray, which will reduce the service life of the stove tray

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