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Coking wastewater biological denitrificaion treatment process

A technology for coking wastewater and biological denitrification, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. and other problems, to achieve the effect of stable operation effect, low operation cost and high denitrification rate

Active Publication Date: 2009-08-26
BEIJING SHOUGANG INT ENG TECH
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Problems solved by technology

However, in actual production, due to the extremely difficult control of various operating conditions, it is very difficult to fully realize the short-cut nitrification and denitrification biological nitrogen removal technology.

Method used

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  • Coking wastewater biological denitrificaion treatment process

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Embodiment Construction

[0026] Using "A / O / A / O (Anoxic / Aerobic / Anoxic / Aerobic)" as the core biological denitrification treatment process for coking wastewater, the specific implementation methods are as follows:

[0027]The pretreated coking waste water enters the bottom water distribution system of the primary anoxic tank after being lifted, and the supernatant of the reflux sedimentation tank (reflux ratio 3:1) also returns to the water distribution system. The first-level anoxic pool is vertical flow, and the water distribution system adopts a large-resistance water distribution method, and the pool is covered with fixed elastic biological fillers. Under anoxic conditions, the anaerobic denitrifying bacteria in the first-stage anoxic tank take the organic matter (COD Cr ) as the carbon source, with the oxygen of nitrite nitrogen and part of the nitrate nitrogen in the reflux supernatant as the electric acceptor, carry out respiration and life activities, and reduce it into nitrogen (N 2 ) escapes ...

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Abstract

The invention relates to a coking wastewater biological denitrificaion treatment process, belonging to the technical field of environmental protection and wastewater processing, which is characterized in that the biological denitrificaion treatment process with A / O / A / O, namely, anoxia / oxic / anoxia / oxic as the core is adopted. The pretreated coking wastewater sequentially enters into a first-level anoxic tank, a first-level oxic tank, a reflow sedimentation tank, a second-level anoxic tank, a second-level oxic tank, a second-level sedimentation tank, short-range nitrification and denitrification biological denitrificaion treatment are carried out on the coking wastewater in the first-level anoxic tank and the first-level oxic tank, hydrolysis acidification and fine denitrification treatment are carried out on the coking wastewater in the second-level anoxic tank, and the second-level oxic tank realizes the full nitration reaction. The process method has stable operational effect, low operational cost, high denitrification percent, water-quality indexes such as CODCr, NH3-N and the like of water from the second-level sedimentation tank can simultaneously reach a first-level discharge standard in Integrated Wastewater Discharge Standard (GB8978-1996), and can be recycled and used by other users after advanced treatment, thus realizing the zero discharge of the coking wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and wastewater treatment, and in particular provides a biological denitrification treatment process for coking wastewater, using "A / O / A / O (anoxic / aerobic / anoxic / aerobic)" as the core The advanced biological denitrification treatment process is suitable for the coking industry wastewater biological denitrification treatment system. Background technique [0002] Coking wastewater is wastewater produced during high-temperature distillation of raw coal, gas purification, and refining of chemical products. There are three main sources: one is residual ammonia water, which is produced during coal dry distillation and gas cooling. More than half of the total is the main source of coking wastewater; the second is the wastewater produced in the process of gas purification, such as gas final cooling water and crude benzene separation water; the third is in the refining process of tar and cr...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30
Inventor 马昕张涛吴云生
Owner BEIJING SHOUGANG INT ENG TECH
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