Method for enhancing anammox granular sludge in UASB
An anaerobic ammonia oxidation and granular sludge technology, applied in the direction of anaerobic digestion treatment, etc., can solve the problems of reducing hydraulic retention time, increasing cross-sectional flow rate, and deteriorating effluent quality, so as to improve hydraulic shear force and sludge concentration. Increase, the effect of good sludge settling performance
Active Publication Date: 2015-03-04
BEIJING UNIV OF TECH
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Problems solved by technology
[0004] Although increasing the shear force, that is, reducing the hydraulic retention time HRT, increasing the cross-sectional velocity, and increasing the influent flow rate can accelerate and strengthen the formation of granular sludge, when the sludge removal load reaches a certain level of stability, continue to increase The water flow rate will lead to a decrease in the removal rate, deterioration of the effluent water quality, and failure to meet the standard
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Embodiment 1
[0018] The test device is mainly divided into water inlet device, main reactor UASB, and reflux device. UASB consists of a bottom water distribution area, a middle reaction area, and a top three-phase separator; the diameter-depth ratio of the reaction area is 1:10 to 1:15, and it is divided into a lower activated sludge area and an upper packing area, with a volume ratio of 1:1 ~2:1.
[0019] Anaerobic ammonia oxidation granular sludge formation stage, using continuous flow operation, the concentration of ammonia nitrogen and nitrite nitrogen in the influent is 100-130mg / L and 110-140mg / L respectively, the initial HRT is 1.90h, and the influent flow rate is 70mL / min, the cross-sectional flow velocity of the reactor is 0.0148cm / s, and continuous flow operation is adopted. After 3 days of continuous operation, the total nitrogen removal rate exceeds 75%, the HRT is reduced to 1.67h, the influent flow rate is 80mL / min, and the cross-sectional flow velocity is 0.0169 cm / s, cont...
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Abstract
The invention relates to a method for enhancing anammox granular sludge in UASB, and belongs to the field of urban domestic sewage denitration treatment and recycling. According to the invention, an UASB reactor is adopted. Through improving inlet water flow rate and reflux ratio, through a granular sludge formation stage, a granular sludge enhancing stage, and a granular sludge stabilizing stage, a total nitrogen removal load reaches 6.5kgN / m3 / d, and an average particle size is 2.0mm, such that anammox granular sludge is successfully enhanced. The average particle size is larger by 1.27mm compared with the anammox granular sludge cultured by Wang Junmin etc. (2011) with an UASB reactor, and a total nitrogen removal load is higher by 0.77kgN / m3 / d.
Description
technical field [0001] The invention belongs to the field of denitrification treatment and regeneration of urban domestic sewage. Background technique [0002] Anaerobic Ammonium Oxidation (ANAMMOX) process is a new type of biological denitrification technology discovered in recent years, which means that under anaerobic conditions, anaerobic ammonium oxidation bacteria directly 4 + as electron donor, with NO 3 - or NO 2 - As the electron acceptor, the NH 4 + , NO 3 - or NO 2 - convert to N 2 biological process. Because of its advantages of high-load operation, saving aeration, less energy consumption, no need to add organic carbon sources, no secondary pollution, low residual sludge output, low operation and infrastructure costs, it has been widely accepted by countries all over the world once it came out. attention, has high scientific research and practical value. However, the growth rate of anammox bacteria is low and the doubling time is long. In addition,...
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IPC IPC(8): C02F3/28
Inventor 李冬何永平张肖静梁瑜海张翠丹杨胤张玉龙吴青周元正苏庆岭门绚范丹姜沙沙梁雨雯路健王朗杨杰张金库卫家驹曾辉平张杰
Owner BEIJING UNIV OF TECH