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Coal gasification wastewater processing method

A technology of coal gasification wastewater and treatment methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, flotation water/sewage treatment, etc., can solve the problems of organic pollutants and ammonia nitrogen, unreachable chroma, hydraulic retention Long time and other issues

Active Publication Date: 2012-07-11
ENN ENVIROTECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, COD and NH in the effluent after biological treatment 3 -N, chromaticity, etc. cannot meet the national first-level discharge indicators, and the effluent needs to be further treated to meet the discharge standards.
Chinese patent CN1597567 discloses a biological treatment method for coal gas wastewater and coking wastewater, in which the O-A-O process is used, but the hydraulic retention time of the wastewater in each bioreactor is too long, and the COD and ammonia nitrogen removal rates are all lower than 90% %, which means that the effluent of this patented method still contains a relatively large amount of organic pollutants and ammonia nitrogen

Method used

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Examples

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Embodiment 1

[0044] The high-concentration coal gasification wastewater of a company is treated with the process shown in the attached figure. The quality of the wastewater is shown in Table 1-1. The wastewater treatment capacity of the process system is 2 tons / day, of which the coagulation air flotation system is a customized pressurized dissolved air coagulation air flotation machine, the first aerobic reactor, anaerobic reactor, and the second aerobic reactor And the intermediate pool is all made of carbon steel, and 50% of the biological filler described herein is filled in each reactor. The normal temperature and pressure catalytic oxidation reactor is made of plexiglass, with ozone as the oxidant, filled with 75% of the Catalyst, described catalyzer is load-type catalyst, and its carrier is granular coconut shell activated carbon, and active component is the composite oxide that is made up of oxide of iron, copper oxide and zinc oxide, and wherein respectively with Fe 2 o 3 , CuO an...

Embodiment 2

[0048] The comprehensive wastewater of a coal gasification company is treated with the process shown in the attached figure, and the quality of the wastewater is shown in Table 2-1. The reactor, equipment and biological filler adopted in this embodiment are the same as in Example 1, the waste water treatment capacity is 3 tons / day, the addition of PAC and PAM is 100-120mg / L and 1-3mg / L, K 2 HPO 4 The addition amount of the wastewater is 20-50mg / L, the HRT of the waste water in the first aerobic reactor, anaerobic reactor and the second aerobic reactor is 16h, 13.5h and 13.5h respectively, and in the ozone catalytic oxidation reactor The HRT is 1-1.5h, the amount of ozone added is 8-10mg / L, the catalyst is a supported catalyst, and the granular coal-based activated carbon is used as the carrier. The active components are iron oxides, copper oxides and manganese. A composite oxide composed of oxides, and in which Fe 2 o 3 , CuO and MnO 2 The mass sum of the above three oxide...

Embodiment 3

[0052] Using the process shown in the accompanying drawings, the difference compared with Example 1 is that a Fenton oxidation reactor made of carbon steel is added before the catalytic oxidation reactor. The combined process of coagulation air flotation, OAO, Fenton oxidation, and normal temperature and pressure catalytic oxidation is used sequentially to treat the high-concentration coal gasification wastewater in Example 1. The reactor, equipment and biological filler used in this example are the same as those in Example 1. , The wastewater treatment capacity is 2 tons / day. Sequential addition of FeSO to the feed water line of the Fenton oxidation reactor 4 and H 2 o 2 , the addition amount is respectively 950-1100mg / L and 1400-1600mg / L, and the catalytic oxidation reaction uses air as an oxidant, and fills 70% of the catalyst, and the catalyst is a granular coconut shell activated carbon as a carrier, and the active component is A composite oxide composed of iron oxide ...

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Abstract

The invention relates to a coal gasification wastewater processing method. The method comprises the following steps: carrying out coagulation processing and air floatation processing on coal gasification wastewater, sequentially carrying out aerobic biological processing, anaerobic biological processing and the aerobic biological processing by allowing the wastewater to flow through a first aerobic reactor, an anaerobic reactor and a second aerobic reactor, allowing parts of water discharged from the second aerobic reactor to return to the anaerobic reactor, and carrying out normal-temperature normal-pressure catalytic oxidation or carrying out Fenton oxidation and normal-temperature normal-pressure catalytic oxidation on the residual water.

Description

field of invention [0001] The invention relates to a treatment method for waste water, especially coal gasification waste water. Background technique [0002] The application of coal as energy and chemical raw materials has been paid more and more attention. Coal gasification is a clean and efficient coal utilization method, but the coal gasification process produces a large amount of highly polluting coal gasification wastewater, which contains a variety of pollutants, such as phenol, cyanide, ammonia nitrogen and several aliphatic and aromatic compounds , it needs to be treated effectively before it can be discharged. [0003] In the field of wastewater treatment, indicators such as chemical oxygen demand (COD), ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, and chromaticity are often used to indicate the type and / or amount of pollutants in wastewater. Among them, COD, also known as chemical oxygen demand, refers to the amount of oxidant consumed when a certain st...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/52C02F1/24
Inventor 贾永强李伟张宝库雷金环
Owner ENN ENVIROTECH CO LTD
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