Method for treating leachate in domestic refuses landfill site by tower type aged-refuse bioreactor

Abstract

A tower biological reaction bed with mineralized garbage for treating the leakage liquid in domestic refuse landfill site, relating to a cleaning treating process for the leakage liquid in domestic refuse landfill site, comprising: constructing the biological multistage reaction bed with mineralizing garbage(3): cascading several reaction bed vertically or horizontally, or combining them crossly,with mineralized garbage(4) and ventilating pipe (5) equipped in every reaction bed, and the bed surface is equipped with hydraulic pipeline, then treating the current leakage liquid anaerobiclly to remove part of organic load, spraying it to the first-stage reaction bed surface intermittently, the leakage liquid leaking out through the bottom broken stone hardcore after adsorbed by mineralized garbage and biologically degraded, reaerating in the falling course and entering into the second reaction bed for further treatment, and the clearance of main pollutant reaching to 90-99%. The inventionis characterized by the low running cost, convenient caring and operation, strong resistant to load impact, long durability and wide application prospect.

Description

technical field [0001] The invention relates to the purification treatment technology of the leachate of domestic garbage landfill, and belongs to the technical field of waste water treatment. Background technique [0002] At present, the output of domestic garbage in my country is increasing year by year at a rate of 5-8%. In 2004, the volume of garbage removal has exceeded 158 million tons, of which more than 90% are landfilled. Nearly a thousand landfills in my country produce 40,000 to 80,000 tons of leachate per day. Due to its pollution characteristics such as complex water quality, large fluctuations in water volume, high concentrations of organic matter and ammonia nitrogen, and imbalanced nutrient element ratios, its treatment has not yet been perfected. craft. According to the survey results of 292 large and medium-sized landfills nationwide by the Urban Construction Institute: 12% of the landfill leachate has been treated up to the standard (entering the municipal...

AI Technical Summary

Problems solved by technology

Nearly a thousand landfills in my country produce 40,000 to 80,000 tons of leachate per day. Due to its pollution characteristics such as complex water quality, large fluctuations in water volume, high concentrations of organic matter and ammonia nitrogen, and imbalanced nutrient element ratios, its treatment has not yet been perfected. craft

According to the survey results of 292 large and medium-sized landfills nationwide by the Urban Construction Institute: 12% of the landfill leachate has been treated up to the standard (entering the municipal pipe network); 49% of the landfill has been treated, but not up to the standard; and The remaining 39% of the landfills are directly discharged without any treatment at all, causing serious pollution to the surrounding environment.

[0003] The treatment schemes of landfill leachate at home and abroad can be roughly divided into recharge treatment, combined treatment with urban sewage after pretreatment, and on-site treatment of combined biological-physicochemical processes: (1) The recharge scheme is a natural strengthening process, and the operation Simple, low treatment cost, can accelerate the stabilization process of landfill at the same time, but the actual application lacks mature process design and operation experience, there are environmental sanitation and safety problems in operation, and the treatment effect is not good, and part of the concentrated liquid needs to be discharged outside for treatment; (2) Combined treatment can use urban sewage to buffer, dilute and nutrient balance the leachate to achieve simultaneous treatment of the two, saving infrastructure and operating costs, but this scheme is limited by the location, distance and transportation of landfills and sewage plants Cost and other factors are limited, and the complex water quality of the leachate will also have a negative impact on the normal operation of the sewage plant; (3) The on-site scheme meets the requirements of separate treatment of large-scale landfill leachate, and most of them currently adopt "physical and chemical pretreatment (coagulation sedimentation, ammonia stripping, chemical oxidation, stripping, etc.) + biological subject treatment (anaerobic, anoxic, aerobic, etc.) + physical and chemical advanced treatment (adsorption, reverse osmosis, catalytic oxidation, evaporation, etc.)" combination Technology, such as "anaerobic pond + facultative pond + aeration pond + reed wetland + chemical oxidation" in Shanghai Laogang landfill, "UASB+SBR+reverse osmosis" in Guangzhou Xingfeng landfill, Shenzhen Xiaping landfill "coagulation sedimentation + ammonia nitrogen stripping + anaerobic filter + SBR" at the Foshan Baishi'ao landfill, "anaerobic + ammonia nitrogen stripping + A / O + coagulation and sedimentation" at the Baishi'ao landfill in Foshan, etc., but in practical applications, these The process is often limited by the long process, large land occupation, difficult maintenance and management, high infrastructure and operating costs, and poor adaptability of water quality and quantity, making it difficult for the existing leachate treatment facilities to operate normally, and it is difficult for the process effluent to reach GB16889- 1997 Secondary Emission Standard

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