Method for processing city household garbage leachate

Abstract

The invention discloses a method for processing city household garbage leachate. Aiming at the garbage leachate's characteristics of high ammonia nitrogen content and difficult biodegradation, people develop the processing method by combining and optimizing the following technologies: lime pretreatment, gas-film acid absorption, high efficient multi-grade AO biochemical treatment, and modified carbon absorption. The processing method comprises the following steps: subjecting the garbage leachate to a foam separation process so as to reduce the grease and surfactant content in the garbage leachate; adding lime into the garbage leachate so as to adjust the pH value of the garbage leachate and convert the ammonia nitrogen into a free state; subjecting the garbage leachate to processes of micro-filtration and ultrafiltration so as to eliminate macromolecular organic substances, then subjecting the garbage leachate to a gas-film acid absorption treatment so as to effectively eliminate the nitrogen ammonia with a high concentration in the garbage leachate to meet the requirements of biochemical treatment, subjecting the garbage leachate to go through an AO biochemical treatment system so as to further eliminate the pollutants such as total nitrogen, ammonia nitrogen, COD, BOD, and the like in the garbage leachate, so that after the processes mentioned above, only organic matters that are difficult to degrade and soluble are left in the garbage leachate, adopting modified carbon as an absorbent and a counter-current multi-grade absorption technology to effectively eliminate the organic matters difficult to degrade in the garbage leachate to make the garbage leachate meet the national discharging standard, and finally discharging the qualified garbage leachate.

Description

technical field [0001] The invention relates to the field of garbage treatment, and is applied to a process and a realization method for removing refractory organic matter and high-concentration ammonia nitrogen in urban domestic garbage leachate. Background technique [0002] Since the beginning of the 21st century, my country's economy has developed rapidly, the scale of cities has continued to expand, and the process of urbanization has continued to accelerate. However, the amount of urban domestic waste has also increased sharply. According to statistics, at present, the annual output of urban waste in my country has exceeded 140 million tons, and it is growing at a rate of 8% to 10% every year. The per capita daily waste production has exceeded 1.1kg. up to 20,000 tons. my country has become one of the most serious countries in the world where cities are surrounded by garbage. [0003] Landfill leachate is the sewage filtered out due to fermentation and precipitation l...

AI Technical Summary

Problems solved by technology

At present, the technology that can reach the discharge standard mainly adopts reverse osmosis technology, but there are still many problems in the treatment of landfill leachate by this technology. First, the concentrated liquid generated during the application process cannot be treated, and the pollutants cannot be fundamentally removed, which limits its wide application. , secondly, the reverse osmosis membrane is easy to clog, and the membrane flux decreases rapidly, so it needs to be replaced immediately. Third, the investment and operation cost of reverse osmosis technology is relatively high. Yuan calculation, the average operating cost is 50-60 yuan

[0006] High operating and investment costs make reverse osmosis technology the only technology that can meet the discharge standards for landfill leachate, and there are still limitations in its wide application

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