Treatment process of landfill municipal sludge press filtering tail water

Abstract

The invention discloses a treatment process of landfill municipal sludge press filtering tail water, and belongs to the field of sewage treatment. The land resources in China are limited; when no proper treatment technology and no excessive regions are used for sludge landfill, the further volume reduction of the landfill sludge becomes the present searching direction. After chemical conditioning agents are added into the landfill sludge, the tail water subjected to press filtering has complicated ingredients and high contaminant contents; the treatment difficulty is high. By aiming at the pollution characteristics of the tail water, the existing advanced treatment technology can be combined; a combined process of blowoff, inclined pipe precipitation, hydrolysis acidification pool and two-stage biological aerated filter is used for realizing the effective treatment on the tail water with high ammonia nitrogen concentration, low C / N value, low B / C value and high chloride ion concentration; in addition, the operation and the management are simple; the removal effect is stable; the anti-impact load is high; the quantity of the generated sludge is small; the cost is low.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a treatment process for landfilling municipal sludge press filter tail water. Background technique [0002] By the end of 2015, the sludge output of urban sewage treatment plants across the country reached more than 35 million tons / year, and it is estimated that by 2020, the sludge output will reach 60 million tons / year. At present, the most important methods of sludge disposal in the world include agricultural utilization, sanitary landfill, incineration, and ocean disposal. In my country, sludge treatment and disposal mainly use methods such as landfill, composting, drying, and incineration. These four The proportions of the two treatment methods are 65%, 15%, 6% and 3% respectively. Considering environmental benefits and economic benefits comprehensively, the sanitary landfill of sludge from urban sewage treatment plants across the country has become the main way of sludge disp...

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Problems solved by technology

[0004] In the process of further reducing the volume of landfill sludge, the current effective method is to add a large amount of chemical conditioning and curing agent to perform pressure filtration. Compared with the fresh sludge, the pressure filtration tail water at this time is The composition is more complex, the pollutant content is higher, and the treatment is more difficult. The reason is that the landfill sludge will undergo complex biochemical reactions in the sludge landfill, and the sludge landfill can be regarded as a biochemical reactor. ,During the landfill process, due to the production of various metabolites by anaerobic fermentation, organic matter decomposition, rainwater washing, etc., the moisture content of the landfill sludge will increase, and then the composition of the press-filtered tail water is complex after adding chemical agents: 1) Ammonia nitrogen As the content increases, the organic matter decomposes to produce a large amount of ammonia nitrogen, and the carbon-nitrogen ratio decreases; 2) the B / C ratio decreases, and the microorganisms use the degradable organic matter during the landfill process, resulting in a decrease in BOD, and most of the remaining COD is difficult to be used by microorganisms Organic matter; 3) The ratio of microbial nutrient elements is out of balance, the phosphorus content in water is very low, and the C:N:P ratio is not within the nutrient range suitable for microbial growth. Quicklime will be added as a conditioning and curing agent, which will reduce the P contained in the water; 4) The large amount of chemical conditioning agent added again increases the difficulty of tail water treatment, especially the introduction of chloride ions; 5) The tail water has high hardness and chromaticity tall and flavorful

At home and abroad, the treatment of sewage (waste) water is mainly concentrated in the chemical industry, nonferrous metals, petrochemical, agricultural and sideline food, papermaking, textile and other industries. There is no precedent for the treatment of landfill sludge press filter tail water

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