CN107311273B - Efficient pretreatment method of polyether wastewater - Google Patents
Efficient pretreatment method of polyether wastewater Download PDFInfo
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- CN107311273B CN107311273B CN201710448454.9A CN201710448454A CN107311273B CN 107311273 B CN107311273 B CN 107311273B CN 201710448454 A CN201710448454 A CN 201710448454A CN 107311273 B CN107311273 B CN 107311273B
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- wastewater
- polyether
- iron
- carbon
- polyether wastewater
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
Abstract
The invention provides a high-efficiency pretreatment method of polyether wastewater, which comprises the steps of adjusting the pH of the polyether wastewater to 2-6 by using HCl, introducing the polyether wastewater into a reactor filled with iron and activated carbon loaded cerium oxide filler for reaction, introducing air into the bottom of a filler layer, adjusting the pH of effluent to 8-9 by using NaOH, precipitating, filtering and discharging. The invention utilizes the battery effect generated by iron and carbon to form countless tiny primary batteries, wherein low-level iron is an anode, carbon with high potential is a cathode, and nascent state [ H ] obtained in the electrode reaction has stronger activity and can generate oxidation-reduction reaction with a plurality of components in the wastewater, thereby changing the structure and the characteristics of organic matters in the wastewater, leading the organic matters to generate chemical reactions such as chain scission, ring opening and the like, improving the biodegradability and the COD removal effect of the wastewater, and providing reliable guarantee for the standard discharge of the subsequent treatment of the wastewater. The COD removal rate of the polyether wastewater is 60-70%, and the B/C ratio is improved from 0.15 to 0.5-0.67.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a high-efficiency pretreatment method of polyether wastewater.
Background
The polyether wastewater consists of incompletely reacted raw materials including glycerol, propylene glycol, styrene, acrylonitrile, ethylene oxide and propylene oxide, side reaction products including low molecular polymerization monomers, high molecular polyether and the like, has various pollutants, complex components, high organic matter concentration, large water quality fluctuation and difficult biochemical degradation, and belongs to one of the accepted organic chemical wastewater difficult to treat. The conventional biochemical treatment process of the wastewater is long, the cost is high, the occupied area is large, and the efficiency is low.
At present, more pretreatment methods are adopted for polyether wastewater, CN 102372402B adopts catalytic oxidation reaction to pretreat polyether wastewater, so that the B/C ratio (BOD) of the wastewater is increased5COD, an index for measuring biodegradability of wastewater. The value is less than 0.3, which indicates poor biodegradability of the wastewater, and the value is more than or equal to 0.3, which indicates good biodegradability of the wastewater), can be controlled to be 0.42-0.65, but the pretreatment reaction can be realized by adding a catalyst and an oxidant at the same time; in polyether wastewater treatment scheme research of Shihanliang, polymeric ferric sulfate and polymeric aluminum sulfate are adopted to carry out chemical coagulation on polyether wastewater, the removal rate of COD reaches more than 40%, but the biodegradability of the wastewater is not improved; and the polyether wastewater is treated by using a ceramic membrane technology in 'experimental research on flux influencing factors of polyether wastewater treated by ceramic membranes', most of macromolecular polyether polyol is intercepted, the biodegradability of the wastewater is improved, and the regeneration and maintenance cost of the membranes is higher.
Therefore, aiming at the characteristics of polyether wastewater, the invention develops an efficient iron and active carbon loaded cerium oxide catalytic oxidation pretreatment method on the basis of conventional iron-carbon micro-electrolysis, fully utilizes the oxygen storage and efficient electron transfer capabilities of cerium oxide, has obvious effects on the removal of wastewater COD and the improvement of biodegradability, and can provide powerful technical support for the efficient and stable operation of subsequent biochemical treatment facilities.
Disclosure of Invention
The invention aims to provide an efficient pretreatment method of polyether wastewater, which can solve the problems of high cost, large occupied area, low efficiency and the like in the prior art, effectively remove COD (chemical oxygen demand) of the wastewater and greatly improve the biodegradability of the wastewater.
In order to achieve the purpose, the invention adopts the following technical scheme:
adjusting the pH of the polyether wastewater to 2-6 by using HCl, introducing the polyether wastewater into a reactor filled with iron and activated carbon-loaded cerium oxide filler for reaction, introducing air into the bottom of a filler layer, adjusting the pH of effluent to 8-9 by using NaOH, precipitating, filtering and discharging.
In the technical scheme, preferably, the mass ratio of iron to carbon in the packing layer is 1-2: 1, and the loading amount of cerium oxide is 0.1-0.2%;
in the technical scheme, preferably, the residence time of the polyether wastewater in the iron-carbon layer is 60-120 min;
in the technical scheme, preferably, air is introduced into the bottom of the iron-carbon layer, and the volume ratio of air to water is 2-6: 1;
in the technical scheme, preferably, the pH value of the inlet water of the wastewater is adjusted to be 2-6, and the pH value of the outlet water is adjusted to be 8-9.
The method utilizes the battery effect generated by iron and carbon to form countless tiny primary batteries, wherein low-level iron is used as an anode, carbon with high potential is used as a cathode, and nascent state [ H ] obtained in electrode reaction has stronger activity and can generate oxidation-reduction reaction with a plurality of components in wastewater, so that the structure and the characteristics of organic matters in the wastewater are changed, and the organic matters undergo chemical reactions such as chain scission, ring opening and the like, thereby achieving the purpose of degrading COD.
The invention leads the wastewater to generate a plurality of reactions such as iron-carbon micro-electrolysis, flocculation precipitation, catalytic oxidation and the like in the modified iron-carbon filler layer, greatly improves the biodegradability and COD removal effect of the wastewater, and provides reliable guarantee for the subsequent treatment and standard discharge of the wastewater. The COD removal rate of the polyether wastewater is 60-70%, and the B/C ratio is improved from 0.15 to 0.5-0.67.
Detailed Description
The invention is further illustrated by the following examples.
Example 1: adjusting the pH value of the polyether wastewater to 2 by using HCl, introducing the polyether wastewater into a reactor filled with iron and activated carbon loaded cerium oxide filler for reaction, wherein the mass ratio of iron to carbon is 1:1, the loading amount of cerium oxide is 0.14%, introducing air into the bottom of a filler layer, the volume ratio of air to water is 2:1, reacting for 80min, adjusting the pH value of effluent to 9 by using NaOH, precipitating, filtering and discharging. The COD removal rate of the effluent is 70 percent, and the B/C ratio is from.015 to 0.67.
Example 2: adjusting the pH value of polyether wastewater to 5 by using HCl, introducing the wastewater into a reactor filled with iron and activated carbon loaded cerium oxide filler for reaction, wherein the mass ratio of iron to carbon is 1.4:1, the loading amount of cerium oxide is 0.1%, introducing air into the bottom of a filler layer, the volume ratio of air to water is 4:1, reacting for 60min, adjusting the pH value of effluent to 8 by using NaOH, precipitating, filtering and discharging. The COD removal rate of the effluent is 64 percent, and the B/C ratio is from.015 to 0.54.
Example 3: adjusting the pH value of the polyether wastewater to 6 by using HCl, introducing the polyether wastewater into a reactor filled with iron and activated carbon loaded cerium oxide filler for reaction, wherein the mass ratio of iron to carbon is 2:1, the loading amount of cerium oxide is 0.2%, introducing air into the bottom of a filler layer, the volume ratio of air to water is 6:1, reacting for 120min, adjusting the pH value of effluent to 8.4 by using NaOH, precipitating, filtering and discharging. The COD removal rate of the effluent is 60 percent, and the B/C ratio is from.015 to 0.5.
Claims (8)
1. A high-efficiency pretreatment method of polyether wastewater is characterized in that the pH of the polyether wastewater is adjusted to 2-6 by acid, the polyether wastewater is introduced into a reactor filled with iron and activated carbon loaded cerium oxide filler for reaction, air is introduced into the bottom of a filler layer, the pH of effluent is adjusted to 8-9 by alkali, and the effluent is precipitated, filtered and discharged.
2. The method as set forth in claim 1, wherein the mass ratio of iron to carbon in the packing layer is 1-2: 1, and the loading amount of cerium oxide is 0.1-0.2%.
3. The method as set forth in claim 1, wherein the residence time of the polyether wastewater in the iron-carbon layer is 60 to 120 min.
4. The method as claimed in claim 1, wherein air is introduced into the bottom of the iron-carbon layer at a volume ratio of 2-6: 1.
5. The process as set forth in claim 1, characterized in that the acid is HCl.
6. The method of claim 1, wherein the base is NaOH.
7. The method according to claim 1, wherein the COD removal rate of the polyether wastewater is 60-70%.
8. The method as set forth in claim 1, characterized in that the treated polyether wastewater BOD5The ratio of COD/water reaches 0.5-0.67.
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| CN201710448454.9A CN107311273B (en) | 2017-06-14 | 2017-06-14 | Efficient pretreatment method of polyether wastewater |
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| CN109626722B (en) * | 2018-12-18 | 2020-02-21 | 辽宁中舟得水环保科技有限公司 | Aerobic process wastewater treatment method adopting modified graphene iron-carbon material |
| CN112340816A (en) * | 2020-10-22 | 2021-02-09 | 中国石油化工股份有限公司 | Pretreatment method of polyether wastewater |
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| CN102372402B (en) * | 2011-10-09 | 2014-04-09 | 南京工业大学 | Method for treating polyether polyol wastewater |
| CN102658192A (en) * | 2012-04-24 | 2012-09-12 | 天津城市建设学院 | Preparation method of catalyst for treating nonbiodegradable organic waste water and application |
| CN103586026A (en) * | 2013-11-26 | 2014-02-19 | 北京碧水源科技股份有限公司 | Carbon supported catalyst for ozone oxidation, and preparation method and use thereof |
| CN104326605A (en) * | 2014-10-15 | 2015-02-04 | 西安华陆环保设备有限公司 | Method for increasing biodegradability of alcohol waste water |
| CN105645557B (en) * | 2014-12-05 | 2018-06-19 | 中国石油化工股份有限公司 | A kind of catalytic wet oxidation processing method of recirculated water |
| CN106345485B (en) * | 2016-08-25 | 2018-12-07 | 万华化学集团股份有限公司 | A kind of catalyst and its preparation method and application for catalytic oxidation treatment organic wastewater |
| CN106824069B (en) * | 2017-01-13 | 2019-06-14 | 南宁润天环保科技有限公司 | For handling the preparation method of the rear-earth-doped iron Carbon Materials of arsenic-containing waste water |
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