A method for biological denitrification of landfill leachate
A landfill leachate and biological denitrification technology, which is applied in the field of landfill leachate biological denitrification and landfill leachate biological denitrification, can solve the problems of long residence time, large residual sludge output, and large carbon source dosage, etc. problems, to achieve the effect of reducing construction investment and reducing the amount of excess sludge produced
Active Publication Date: 2020-08-04
无锡学院
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Problems solved by technology
The whole process of nitrification and denitrification has the problems of high aeration energy consumption, large excess sludge output, large carbon source dosage, long residence time, and high infrastructure investment costs
Method used
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Embodiment 1
[0021] The process inoculation sludge is taken from the nitrification sludge in the AO aerobic pool of the sewage treatment plant, and is inoculated in each unit of the process after dehydration by pressure filtration. The concentration ratio of total suspended solids (TSS) and volatile suspended solids (VSS) in the inoculation sludge If it is lower than 0.6, the amount of inoculated sludge shall be 5kgTSS / m 3 Dosing.
[0022] After the inoculation is completed, start the operation with continuous water inflow, control the hydraulic retention time to 6d, the temperature of the aerobic tank to 25-35°C, the sludge age to 15-20d, and the influent ammonia nitrogen load to 0.1-0.35kg NH 4 + -N / (m 3 d) Control the sludge concentration in the aerobic tank to 8-12g / L through the interception of the MBR membrane and the sludge return in the MBR tank, the dissolved oxygen concentration in the anoxic tank is 0.2-0.5mg / L, O1 and O2 in the aerobic tank The concentration of dissolved oxy...
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Abstract
The invention discloses a biological denitrification method of refuse leachate, and belongs to the technical field of environment protection. A biological denitrification technology used after anaerobic digestion of leachate of a refuse incineration plant is improved, and leachate raw water is used as a supplementing carbon source, so that COD (Chemical Oxygen Demand), ammonia nitrogen and total nitrogen are efficiently and stably removed, and discharged water indexes reach connection pipe requirements of Water Quality Standards for Sewage Discharge to Municipal Sewers (CJ343-2010). The biological denitrification method comprises the following steps: a denitrification tank in a traditional nitrification and denitrification technology is changed into a UASB (Upflow Anaerobic Sludge Blanket)reactor with a steel structure; meanwhile, mechanical stirring or aeration stirring in the denitrification tank is cancelled, and hydraulic stirring is carried out by a sludge refluxing pump and a mixed solution refluxing pump for replacing the mechanical stirring or the aeration stirring; an aerobic tank is arranged into two sections; the accumulation of nitrite nitrogen is realized through front-section micro-aeration, and full oxidization of residual ammonia nitrogen is realized through rear-end strong aeration; an MBR (Membrane Bioreactor) membrane tank is independently arranged, and theinterception of sludge is realized by adopting a built-in type ultra-filtration membrane; nitrosobacteria and nitrobacteria are enriched, and efficient degradation of the ammonia nitrogen is realized.
Description
technical field [0001] The invention relates to a method for biological denitrification of landfill leachate, in particular to a method for biological denitrification of landfill leachate based on raw water of landfill leachate as an additional carbon source, and belongs to the technical field of environmental protection. Background technique [0002] In the existing landfill leachate biological denitrification process, the whole process of nitrification and denitrification is generally used. The leachate wastewater after anaerobic digestion passes through the denitrification tank, and the carbon source in the leachate wastewater is preferentially used for denitrification and denitrification; then it passes through the nitrification tank, and ammonia nitrogen is oxidized to nitrate nitrogen under the action of strong aeration, and nitrification The tank mixture is returned to the denitrification tank for denitrification and denitrification. The whole process of nitrificatio...
Claims
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IPC IPC(8): C02F3/30C02F101/16C02F103/06
CPCC02F3/1268C02F3/2846C02F3/302C02F2101/16C02F2103/06C02F2209/16
Inventor 王涛黄振兴阮文权
Owner 无锡学院