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New technology for treating coking wastewater and wastewater from coal chemical industry

A technology for coal chemical wastewater and coking wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, degassed water/sewage treatment, etc., to achieve adjustment of process parameters, good denitrification and removal of nitrate nitrogen, and convenient process parameters Effect

Active Publication Date: 2013-09-11
TIANJIN REDSUN WATER IND
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a process for effectively treating refractory coking wastewater and coal chemical wastewater, so that the COD and NH in th

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  • New technology for treating coking wastewater and wastewater from coal chemical industry

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[0039] Using the combined process provided by the present invention to control the influent COD and NH 3 -The actual coking wastewater with N of 3000mg / L and 180mg / L respectively is treated in a small-scale experiment. The experimental water flow rate is 150mL / h. It is pretreated first to remove oil and suspended solids in the water. After pretreatment The coking wastewater 1 enters the resin adsorption tank A. The resin adsorption tank A uses a glass resin adsorption column with a diameter of 15mm, and 8% NaOH solution is desorbed. The COD of the resin adsorption water 2 after the resin adsorption is reduced from 3000mg / L to 750mg / L, the pH of the water 2 absorbed by the resin is 10.6. The resin adsorption effluent 2 removes NH3-N through the air stripping tower B, and the NH3-N of the air stripping tower effluent 3 is reduced from 180mg / L to 40mg / L. The effective volume of anoxic and secondary aerobic bioreactors is 4500mL, and the total residence time is 30h. The hydraulic ...

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Abstract

The invention discloses a new technology for treating coking wastewater and wastewater from coal chemical industry, which comprises the following steps of: (1) pretreatment: removing oils, suspended solids and the like in water by adjustment, oil separation, air flotation, filtration and the like; (2) resin adsorption: adsorbing the wastewater treated by the step (1) by use of a resin adsorption tank; (3) air stripping: treating the wastewater obtained by the step (2) by use of an air stripping tower, and removing most of COD and NH3-N in water by the steps (2) and (3); and (4) treating the wastewater of the step (3) through biological treatment, and further removing COD and NH3-N in water to optimize the whole treatment system, wherein the biological treatment comprises anoxic and two-level aerobic biological treatment. The COD removal rate of the method is over 93%, the removal rate of NH3-N is over 96%, and the COD of the yielding water is about 100mg/L, thereby reaching the second-level discharge standard of GB8978-1996 and approaching to the requirements of the first-level discharge standard; and the NH3-N is lower than 10mg/L, thereby reaching the first-level discharge standard of GB8978-1996.

Description

technical field [0001] The invention relates to a wastewater treatment process, in particular to a treatment method for coal chemical wastewater and coking wastewater, and belongs to the technical field of wastewater treatment. Background technique [0002] Coking wastewater is refractory biodegradable high-concentration toxic organic wastewater produced in the process of coking or gas production, mainly from coking plants in the iron and steel metallurgy and coking industries. Wastewater mainly contains ammonia nitrogen (NH 3 -N), cyanide, phenolic compounds, polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, oxygen, sulfur, and aliphatic compounds, among which phenolic substances in wastewater contributed nearly 70% of the COD value. In addition to complex composition, this type of wastewater also has the characteristics of large changes in water quality, poor biodegradability, and high toxicity. [0003] At present, biological treatment is still ...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/28C02F1/20
Inventor 张兆军
Owner TIANJIN REDSUN WATER IND
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