Method and equipment for cross backflow two-stage double-expansion granular sludge treatment of coking wastewater

A technology for granular sludge and coking wastewater, which is applied in water/sludge/sewage treatment, metallurgical wastewater treatment, biological water/sewage treatment, etc. It can solve problems such as difficulty in improving denitrification efficiency and difficulty in effluent COD reaching discharge standards. To achieve the effect of tight arrangement of microorganisms, rich species of microorganisms, and fast mass transfer

Inactive Publication Date: 2010-07-28
太原大学
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Problems solved by technology

[0011] The present invention is aimed at the traditional coking wastewater treatment process——A / O or A 2 / O process effluent COD is difficult to meet the new discharge standards, the denitrification efficiency is also difficult to improve, and a large amount of aeration is required, and the pure anaerobic or aerobic process is difficult to meet the shortage of coking wastewater treatment requirements, and the provided one has a compact structure , low initial investment and operating costs, good treatment effect, flexible scale, cross-reflux two-stage double-expansion granular sludge coking wastewater treatment process that can simultaneously remove COD and ammonia nitrogen

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  • Method and equipment for cross backflow two-stage double-expansion granular sludge treatment of coking wastewater

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Embodiment 1

[0057] Cross-reflux two-stage double-expansion granular sludge coking wastewater treatment device such as figure 1 As shown, it consists of a primary reactor 5 and a secondary reactor 15, two double-expanded granular sludge reactors, and is equipped with a waste water storage tank 1, a primary aeration reflux column 9 and a secondary aeration reflux column 18.

[0058]Double-expanded granular sludge reactors 5 and 15 are made of plexiglass. The whole reactor is divided into two parts: the reaction zone and the sedimentation zone. Among them, the inner diameter of the reaction zone is 100mm, the height is 1.7m, and the volume is 12L; the inner diameter of the sedimentation zone is 140mm, the height 0.6m, volume 6L. The interior of the reactor is filled with granular sludge that is moderately expanded due to the moderate growth of filamentous bacteria used to degrade pollutants in wastewater. The granular sludge bed formed by these granular sludge is in an expanded state under t...

Embodiment 2

[0074] The dewatered sludge from the digestion tank of a sewage treatment plant in Taiyuan was taken for activity recovery and inoculated into the experimental reactor. The coking wastewater was taken from the second coking plant of Taiyuan Coal Chemical Group. The influent COD and ammonia nitrogen concentrations were 1140-1792 mg·L -1 and 56~179mg·L -1 . Using self-prepared beer wastewater, inoculate a small amount of granular sludge and municipal digested sludge into the reactor at a mass ratio of 1:6, start the operation at 35°C, maintain HRT3.4h, and reduce the influent COD from 200mg·L -1 Increase to 1000mg·L -1 , the influent load is 1.58kgCOD·m -3 d -1 Increase to 7.5kgCOD·m -3 d -1 , quickly formed granular sludge, successfully started the reactor, and the sludge concentration reached 32.7g·L -1 , VSS / SS reached 0.66, COD removal rate reached 94.7%. The two-stage reactors are directly domesticated with coking wastewater, and adopt continuous micro-aerobic aerat...

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Abstract

The invention relates to a method and equipment for cross backflow two-stage double-expansion granular sludge treatment of coking wastewater. The method comprises the following steps: introducing the coking wastewater to a first-stage double-expansion granular sludge reactor and degrading the coking wastewater to produce first-stage treated water; delivering a part of the first-stage treated water to a first-stage aeration backflow column and the other part of the first-stage treated water to a second-stage reactor directly; aerating the treated water which enters the first-stage aeration backflow column, allowing a part of the aerated water and return water of second-stage treatment mixed directly and flow to the first-stage reactor, and making the part of the aerated water and the aerated water of the second-stage treatment mixed and flow into the second-stage reactor; degrading the treated water which enters the second-stage reactor to produce water of the second-stage treatment, directly discharging a part of the water of the second-stage treatment, and making the other part of water of the second-stage treatment flow into a second-stage aeration backflow column; and aerating other part of the water of the second-stage treated treatment, and returning part of the aerated water of the second-stage treatment to the second-stage reactor, and returning the other part of the aerated water of the second-stage treatment to the first-stage reactor as direct return water of the second-stage treatment. The treatment method and equipment can realize the simultaneous efficient removal of COD and ammonia nitrogen from the coking wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a cross-reflux two-stage double-expansion granular sludge coking wastewater treatment method and equipment thereof. Background technique [0002] In order to adapt to my country's economic development model of building a conservation-oriented society and taking the road of circular economy, the country clarified the emission limit standards for industries with high water intake and high emissions such as steel, printing and dyeing, and papermaking in 2004. Strengthening the treatment of coking wastewater, printing and dyeing wastewater, papermaking wastewater, etc., improving effluent quality and recycling rate have become the focus of people's attention and research. [0003] At present, wastewater from many coking plants has not been treated or has not been treated up to the standard; some coking plants' treated water can only meet the standard after being dilu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/12C02F103/16
CPCY02W10/10
Inventor 董春娟潘青业耿炤宇赵聃石俊仙
Owner 太原大学
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