Variable-diameter self-condensing anaerobic reactor for treating low-concentration wastewater
An anaerobic reactor and variable diameter technology, which is applied in the direction of reflux water treatment, anaerobic digestion treatment, biological treatment equipment, etc., can solve the problems of sludge loss and slow formation of granular sludge, and reduce the amount of sludge loss , shorten the start-up time, the effect of intense mass transfer
Active Publication Date: 2019-04-23
SHANDONG UNIV
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Problems solved by technology
In the prior art, the improved reactors are all suitable for the treatment of high-concentration wastewater, but for the treatment of low-concentration wastewater, there are still outstanding problems such as slow formation of granular sludge and easy sludge loss under high hydraulic load conditions.
Method used
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Embodiment 1
[0044] The sample collected in this example is low-concentration wastewater domestic sewage (COD value 300-500mg / L), temperature 18-25°C, hydraulic retention time (HRT) 5-8h, and sludge reflux ratio 3:1. The inoculum sludge came from the anaerobic tank of the sewage treatment plant, its sludge index (SVI) value was 120mL / g, and the mixed liquor volatile suspended solids concentration (MLVSS) value was 14.0g / L. Under the above conditions, after the variable-diameter self-coagulation anaerobic reactor was operated for 2 months, the COD value of the reactor effluent was 31.2-52.0 mg / L, the COD removal rate was 89.6%, and the biochemical oxygen demand (BOD 5 ) removal rate was 93.8%, suspended solids (SS) removal rate was 90%.
[0045] Such as Figure 4 As shown, it is a digital photo of anaerobic granular sludge cultivated in this reactor. The granular sludge is black and dense spherical or ellipsoidal, glossy, and its average particle size is 1.35mm (some granular sludge partic...
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Abstract
The invention discloses a diameter varying type self-coagulation anaerobic reactor for treating low concentration waste water and belongs to the technical field of waste water treatment. The diameter varying type self-coagulation anaerobic reactor comprises five parts of a first section, a second section, a third section, a fourth section and a fifth section form bottom to top sequentially, wherein the first section is of a conical structure, the third section is of a truncated cone structure, and the second section, the fourth section and the fifth section are of cylindrical structures; a first backflow branch pipe is arranged in the connection position of the first section and the second section, an inlet pipe is arranged at the bottom of the first section, and a mud discharge pipe is arranged in the middle of the first section. By the aid of the manner of changing the inner diameter of the reactor and adding the sludge backflow circulation and granule sludge self-coagulation, sludge and waste water can be in contact more fully, mass transfer is enhanced, the sludge loss is reduced, the treatment efficiency is improved remarkably, and the reactor is particularly suitable for low concentration waste water treatment.
Description
technical field [0001] The invention relates to the field of wastewater treatment, in particular to a variable-diameter self-coagulation anaerobic reactor for treating low-concentration wastewater. Background technique [0002] In the field of wastewater treatment technology, the upflow anaerobic sludge bed reactor (UASB) is currently the most widely used anaerobic reactor. The sewage passes through the UASB from bottom to top, and there is a high-concentration and high-activity sludge bed at the bottom of the reactor, where most organic pollutants in the sewage are degraded into methane and carbon dioxide through anaerobic fermentation. Due to the agitation of water flow and air bubbles, there is a sludge suspension layer above the sludge bed. There is a three-phase separator on the upper part of the reactor to separate digested gas, digested liquid and sludge particles. The digested gas is exported from the top of the reactor; the sludge particles automatically slide and...
Claims
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IPC IPC(8): C02F3/28
CPCC02F3/2846C02F3/2873C02F2203/006C02F2301/04
Inventor 黄理辉刘扬扬刘高风王闯董桂花吴雪媛
Owner SHANDONG UNIV