Method for cleaning external tubular membrane for deeply treating waste incineration leachate

Abstract

The invention discloses a method for cleaning an external tubular membrane for deeply treating waste incineration leachate. The method comprises physical cleaning and chemical cleaning, wherein the physical cleaning comprises clear water cleaning, individual gas cleaning, gas-water mixed flushing and high-speed running water flushing, and a PLC (Programmable Logic Controller) system is adopted to control an external tubular membrane bioreactor to automatically switch among the states of running normally, cleaning physically and cleaning chemically. The individual cleaning link is additionally added, so that the damage to the tubular membrane, caused by frequently chemical cleaning operations, can be avoided under a condition that the membrane flux recovery efficiency is ensured, the service life of the membrane is effectively prolonged and the energy consumption of partial water pumps is saved; the PLC is introduced to automatically control the adding amount of chemicals during cleaning and reduce the waste; and a neutralization tank is additionally arranged to control pH value of the liquid after cleaning, prevent pollution of the discharged liquid after cleaning to the environment and achieve the environment-friendly effect. The invention also discloses a cleaning system using the cleaning method.

Description

technical field [0001] The invention belongs to the field of membrane technology, and in particular relates to a cleaning method for advanced treatment of waste incineration leachate with an external tubular membrane. Background technique [0002] Waste incineration power generation is gradually becoming a new trend of urban domestic waste treatment in my country. It can simultaneously realize waste reduction, recycling and harmlessness, and meets the requirements of sustainable development. The proportion of kitchen waste in my country's urban domestic waste is relatively large, resulting in high moisture content and low calorific value of the waste, which brings difficulties to incineration. In order to increase the calorific value, the garbage is generally subjected to heating and aging treatment for 3 to 5 days, and this process is accompanied by the generation of a large amount of leachate, which is characterized by complex components, high concentration of organic matt...

AI Technical Summary

Problems solved by technology

When the patent "air lift type external tubular membrane bioreactor purification device" (publication number: CN102730816A) cleans the membrane, after 15-20 cycles of water air washing, the tubular membrane module is cleaned for 10-15 minutes. Chemical immersion cleaning, when this method is used to treat waste incineration leachate, which is a special water quality with high metal ion and silica concentration, it cannot make the membrane flux with serious pollution achieve a high recovery rate

The patent "a cleaning agent, cleaning method and cleaning device for tubular membrane" (publication number: CN103285738) invented a chemical cleaning agent prepared with C1-C4 alcohol as solvent and acid or alkali as solute. This cleaning agent is used To clean the membrane polluted by waste incineration leachate, the membrane flux cannot be effectively recovered. If frequent chemical cleaning is used to improve the membrane specific flux recovery rate, it will not only consume a large amount of chemical reagents, but also affect the membrane material. Causes damage and shortens membrane life

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