CN111333224A - Pretreatment method and device for semi-coke wastewater - Google Patents
Pretreatment method and device for semi-coke wastewater Download PDFInfo
- Publication number
- CN111333224A CN111333224A CN202010182154.2A CN202010182154A CN111333224A CN 111333224 A CN111333224 A CN 111333224A CN 202010182154 A CN202010182154 A CN 202010182154A CN 111333224 A CN111333224 A CN 111333224A
- Authority
- CN
- China
- Prior art keywords
- semi
- wastewater
- coke wastewater
- coke
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to a semi-coke wastewater pretreatment method, which comprises the following steps; step one; acid adjustment: the PH value of the raw water of the semi-coke wastewater is adjusted to 5.0-6.0 by acid liquor, so that the solubility of phenolic substances in the wastewater is reduced. Step two; and (3) extraction: and (3) enabling the semi-coke wastewater after the acid adjustment to enter an extraction device, and carrying out countercurrent contact with an extractant to remove phenolic substances in the wastewater. Step three; alkali adjustment: and (3) allowing the semi-coke wastewater after extraction to enter an adjusting tank, adding alkali liquor, and adjusting the pH to 9.0-11.0 to convert ammonium ions in the wastewater into free ammonia. Step four; stripping by blowing: and (3) enabling the semi-coke wastewater after the alkali adjustment to enter a high-efficiency stripping tower to remove ammonia nitrogen in the water.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a semi-coke wastewater pretreatment method and device.
Background
The semi-coke wastewater is also called semi-coke wastewater, and is industrial wastewater formed by low-metamorphic coal (non-caking coal, weakly caking coal and long flame coal) in the medium-low temperature dry distillation (about 600-800 ℃) process, coal gas purification and semi-coke steam quenching process. The wastewater has complex components, contains a large amount of pollutants which are difficult to degrade and have high toxicity, such as organic pollutants of benzene series, phenols, polycyclic aromatic hydrocarbons, nitrogen-oxygen heterocyclic compounds and the like and inorganic pollutants of heavy metals and the like, and is typical industrial wastewater with high pollution and high toxicity. After the national department of industry and information-based industry listed the semi-coke in the industry catalog in 2008, the semi-coke industry was developed rapidly due to the huge market demand, but the environmental workers did not keep pace with the research on semi-coke wastewater, and most of the semi-coke production enterprises put into production still adopt the common biochemical treatment method or incineration method for wastewater treatment. The main furnace type of the carbonization furnace adopted by the existing semi-coke enterprise is an internal heating type vertical furnace, and because tar and water produced by the production process of the vertical furnace are difficult to separate, the COD of wastewater reaches 30000-40000 mg/L, and the wastewater contains a large amount of toxic substances for inhibiting the growth of microorganisms, the biochemical treatment is difficult to reach the standard. The incineration method is only suitable for small-sized enterprises with a small amount of water due to high energy consumption, and harmful substances in the waste water are discharged into the atmosphere in the form of steam during incineration, which causes secondary pollution.
Generally, the COD content of the semi-coke wastewater is above 40000mg/L, the phenol content is above 4000mg/L, the ammonia nitrogen concentration is above 3000mg/L, and part of macromolecular substances are difficult to be biochemically degraded. However, the concentration of the semi-coke wastewater pollutants is about 10 times higher than that of coking wastewater, the components are more complex and the treatment is more difficult than that of the coking wastewater, so that the existing treatment method referring to the coking wastewater has the problems of poor actual operation effect, high operation cost, complex operation and the like
Disclosure of Invention
Therefore, in order to solve the above problems, the invention provides a method and an apparatus for pretreating semi-coke wastewater, which can effectively reduce the biotoxicity of the semi-coke wastewater, improve the biodegradability of the semi-coke wastewater, and guarantee the stable operation and water treatment effect of a subsequent biochemical system.
In order to realize the technical problem, the invention adopts a solution of a semi-coke wastewater pretreatment method, which comprises the following steps;
step one; acid adjustment: the PH value of the raw water of the semi-coke wastewater is adjusted to 5.0-6.0 by acid liquor, so that the solubility of phenolic substances in the wastewater is reduced.
Step two; and (3) extraction: and (3) enabling the semi-coke wastewater after the acid adjustment to enter an extraction device, and carrying out countercurrent contact with an extractant to remove phenolic substances in the wastewater.
Step three; alkali adjustment: and (3) allowing the semi-coke wastewater after extraction to enter an adjusting tank, adding alkali liquor, and adjusting the pH to 9.0-11.0 to convert ammonium ions in the wastewater into free ammonia.
Step four; stripping by blowing: and (3) enabling the semi-coke wastewater after the alkali adjustment to enter a high-efficiency stripping tower to remove ammonia nitrogen in the water.
The further improvement is that: in the acid adjusting step, acid liquor is one or a mixture of sulfuric acid, hydrochloric acid, acetic acid, oxalic acid and citric acid.
The further improvement is that: the extraction step adopts two-stage extraction, and the extracting agent is one or a mixture of several of methyl isobutyl ketone, tributyl phosphate and octanol.
The further improvement is that: the volume ratio of the extracting agent to the wastewater is 1: 4-1: 6, the extraction temperature is 25-50 ℃.
The further improvement is that: in the alkali adjusting step, one or a mixture of more of NaOH, Ca (OH)2 and KOH is selected as the liquid alkali, and the concentration is 10-20%.
The further improvement is that: in the blowing-off step, chemical agents such as a catalyst, a denitrifier or a defoaming agent are not required to be added.
The further improvement is that: the air-water ratio in the stripping step is controlled to be 80-120: 1,
the further improvement is that: the temperature of the air stripping step is controlled to be 50-60 ℃,
the further improvement is that: and in the stripping step, the stripping time is controlled to be 1 h.
The further improvement is that: the utility model provides a blue preprocessing device of charcoal waste water, includes in the preliminary treatment module that transfers sour pond, extraction element, equalizing basin, high-efficient stripping tower that communicate in proper order.
By adopting the technical scheme, the invention has the beneficial effects that:
1. the whole set of pretreatment method and device is an integrated process, and has the advantages of short flow, stability, reliability and simple and convenient operation.
2. Before extraction, the pH value of the semi-coke wastewater is adjusted to weak acidity, so that the emulsification phenomenon during extraction is avoided, the solubility of phenolic substances in the wastewater is reduced, and the extraction efficiency is improved.
3. The extraction is adopted to replace the traditional physical method of gravity oil removal and the like, the phenol substances such as tar and the like in the semi-coke wastewater can be effectively removed, and the extraction step is carried out before the stripping step, so that the blockage of facilities and equipment such as pipelines, water pumps, subsequent treatment devices and the like caused by the cooling hardening of the tar can be prevented on the one hand; on the other hand, the problem of excessive foam generation in the blowing process can be avoided, so that chemical agents such as a defoaming agent and the like are not required to be additionally added during blowing, the operation cost is reduced, and the operation stability of the device and the system is improved.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific embodiments.
The semi-coke wastewater to be treated in the invention is prepared from the following sources: the industrial wastewater formed by the low metamorphic coal in the middle and low temperature dry distillation process, the coal gas purification process and the semi coke quenching process has complex components, mainly contains high-concentration organic matters and inorganic matters, is a pollutant with strong toxicity, and is generally difficult to treat and recycle.
Inorganic pollutants in the semi-coke wastewater mainly comprise sulfides, cyanides, ammonia nitrogen, thiocyanides and the like; the organic pollutants mainly contain coal tar substances, wherein the content of phenols is high, and the organic pollutants also contain monocyclic and polycyclic aromatic compounds, heterocyclic compounds containing nitrogen, sulfur and oxygen, and the like. Therefore, the semi-coke wastewater has the characteristics of complex components, high pollutant concentration, high chromaticity, high toxicity and stable property, and belongs to one of the industrial wastewater which is difficult to treat.
The water quality of the semi-coke wastewater is generally as follows:
referring to fig. 1, a semi-coke wastewater pretreatment method comprises the following treatment steps;
the method comprises the following steps: adjusting the pH value of the semi-coke wastewater to 5.0-6.0 by hydrochloric acid, reducing the solubility of phenolic substances in the wastewater and ensuring the efficient and smooth extraction;
step two: and (2) extracting, namely performing two-stage extraction, so that the semi-coke wastewater after acid adjustment enters an extraction device and is in countercurrent contact with an extracting agent to remove phenolic substances in the wastewater, wherein the extracting agent is octanol, and the volume ratio of the extracting agent to the wastewater is 1: 5, extracting a large amount of phenolic substances in the wastewater at the extraction temperature of 25-50 ℃ by using an extracting agent, thereby effectively reducing the concentration of organic pollutants and biological toxicity of the wastewater;
step three: adjusting alkali, namely enabling the semi-coke wastewater after extraction to enter an adjusting tank, adding 10% sodium hydroxide alkali liquor, adjusting the pH to 9.0-11.0, converting ammonium ions in the wastewater into free ammonia, and ensuring that the subsequent stripping step is carried out efficiently and smoothly;
step four: blowing off, namely feeding the semi-coke wastewater after alkali adjustment into a high-efficiency blowing-off tower for blowing off, and controlling the gas-water ratio to be 80-120: under the condition of 1, the temperature is 50-60 ℃, the stripping time is 1h, the ammonia nitrogen in the wastewater is effectively removed, and the biodegradability of the wastewater is improved.
A pretreatment device for semi-coke wastewater comprises an acid adjusting tank, an extraction device, an adjusting tank and a high-efficiency stripping tower which are sequentially connected through pipelines.
Taking 3 groups of semi-coke wastewater obtained from a certain coking plant in Shaanxi as an example, the wastewater quality indexes are as follows:
through the experimental steps, the following experimental results are obtained:
the BOD5 of the wastewater treated by the process is tested, and the B/C ratio is calculated, so that the experimental results are as follows:
| biodegradability | First group | Second group | Third group |
| B/C | 3.8 | 3.5 | 3.7 |
Three groups of experiments B/C all reach more than 0.3, and can be biodegraded by microorganisms. Therefore, the integrated process of acid regulation, extraction, alkali regulation and stripping is adopted to treat the semi-coke wastewater, the pretreatment method can effectively reduce the biotoxicity of the semi-coke wastewater, improve the biodegradability of the semi-coke wastewater and provide guarantee for the stable operation of a subsequent biochemical system and the water treatment effect.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (10)
1. A semi-coke wastewater pretreatment method is characterized by comprising the following steps: comprises the following steps;
step one; acid adjustment: the PH value of the raw water of the semi-coke wastewater is adjusted to 5.0-6.0 by acid liquor, so that the solubility of phenolic substances in the wastewater is reduced.
Step two; and (3) extraction: and (3) enabling the semi-coke wastewater after the acid adjustment to enter an extraction device, and carrying out countercurrent contact with an extractant to remove phenolic substances in the wastewater.
Step three; alkali adjustment: and (3) allowing the semi-coke wastewater after extraction to enter an adjusting tank, adding alkali liquor, and adjusting the pH to 9.0-11.0 to convert ammonium ions in the wastewater into free ammonia.
Step four; stripping by blowing: and (3) enabling the semi-coke wastewater after the alkali adjustment to enter a high-efficiency stripping tower to remove ammonia nitrogen in the water.
2. The method for pretreating semi-coke wastewater according to claim 1, wherein the method comprises the following steps: in the acid adjusting step, acid liquor is one or a mixture of sulfuric acid, hydrochloric acid, acetic acid, oxalic acid and citric acid.
3. The method for pretreating semi-coke wastewater according to claim 1, wherein the method comprises the following steps: the extraction step adopts two-stage extraction, and the extracting agent is one or a mixture of several of methyl isobutyl ketone, tributyl phosphate and octanol.
4. The method for pretreating semi-coke wastewater according to claim 3, wherein the method comprises the following steps: the volume ratio of the extracting agent to the wastewater is 1: 4-1: 6, the extraction temperature is 25-50 ℃.
5. The method for pretreating semi-coke wastewater according to claim 1, wherein the method comprises the following steps: in the alkali adjusting step, the liquid alkali is one or a mixture of NaOH, Ca (OH)2 and KOH, and the concentration is 10-20%.
6. The method for pretreating semi-coke wastewater according to claim 1, wherein the method comprises the following steps: in the blowing-off step, chemical agents such as a catalyst, a denitrifier or a defoaming agent are not required to be added.
7. The method for pretreating semi-coke wastewater according to claim 6, wherein the method comprises the following steps: the air-water ratio in the stripping step is controlled to be 80-120: 1.
8. the method for pretreating semi-coke wastewater according to claim 7, wherein the method comprises the following steps: the temperature of the stripping step is controlled to be 50-60 ℃.
9. The method for pretreating semi-coke wastewater according to claim 8, wherein the method comprises the following steps: and in the stripping step, the stripping time is controlled to be 1 h.
10. The utility model provides a pretreatment device of blue charcoal waste water which characterized in that: the pretreatment module comprises an acid adjusting tank, an extraction device, an adjusting tank and a high-efficiency stripping tower which are sequentially communicated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182154.2A CN111333224A (en) | 2020-03-16 | 2020-03-16 | Pretreatment method and device for semi-coke wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010182154.2A CN111333224A (en) | 2020-03-16 | 2020-03-16 | Pretreatment method and device for semi-coke wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111333224A true CN111333224A (en) | 2020-06-26 |
Family
ID=71178762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010182154.2A Pending CN111333224A (en) | 2020-03-16 | 2020-03-16 | Pretreatment method and device for semi-coke wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111333224A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611749A (en) * | 2020-10-30 | 2021-04-06 | 重庆金美新材料科技有限公司 | Method for detecting content of ammonium citrate in liquid |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104860483A (en) * | 2015-05-27 | 2015-08-26 | 张世文 | Method for carrying out treatment and regenerative cyclic utilization on semi-coke wastewater and recycling resources |
| CN105060628A (en) * | 2015-08-04 | 2015-11-18 | 重庆杰润科技有限公司 | Semi-coke wastewater treatment method |
-
2020
- 2020-03-16 CN CN202010182154.2A patent/CN111333224A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104860483A (en) * | 2015-05-27 | 2015-08-26 | 张世文 | Method for carrying out treatment and regenerative cyclic utilization on semi-coke wastewater and recycling resources |
| CN105060628A (en) * | 2015-08-04 | 2015-11-18 | 重庆杰润科技有限公司 | Semi-coke wastewater treatment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112611749A (en) * | 2020-10-30 | 2021-04-06 | 重庆金美新材料科技有限公司 | Method for detecting content of ammonium citrate in liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103553260B (en) | Synergic extraction and negative-pressure flash evaporation dephenolizing method of high-concentration semi-coke phenolic wastewater | |
| CN103880242A (en) | Advanced treatment process of coal chemical industry wastewater | |
| CN109354347B (en) | Method for treating neomycin sulfate production wastewater | |
| CN101880112A (en) | Coking wastewater treatment process | |
| CN101781038A (en) | Phenol and cyanogen waste water physical chemical method control process and equipment | |
| CN101863523A (en) | Method for treating ammonia-containing waste water from crushed coal pressure gasification | |
| CN111333224A (en) | Pretreatment method and device for semi-coke wastewater | |
| CN113402125A (en) | Coking wastewater advanced treatment and reclaimed water recycling method and system | |
| CN109607985B (en) | Treatment method for standard discharge of coking wastewater | |
| CN103359897A (en) | Process and device for treating high-concentration sulfate radical textile-dyeing wastewater | |
| CN103466791A (en) | Improved pre-acidifying treatment process of citric acid wastewater | |
| CN113754171B (en) | Semi-coke wastewater treatment method combining rectification and membrane separation | |
| CN114262123A (en) | Phenol-ammonia wastewater treatment process | |
| CN113683267A (en) | Treatment system and treatment method for high-concentration degradation-resistant semi-coke wastewater | |
| CN103332832B (en) | Tylosin and roxithromycin production wastewater treatment system and method | |
| CN112707584A (en) | Method for treating cold-rolling oily wastewater of iron and steel enterprises | |
| CN202131125U (en) | Wastewater treating device for recycling deamination and ammonia nitrogen | |
| CN212655657U (en) | High ammonia-nitrogen concentration effluent disposal system | |
| CN215250288U (en) | Coking wastewater advanced treatment system | |
| CN216863920U (en) | Urea production waste liquid treatment device | |
| CN216472731U (en) | Blue charcoal waste water resourceful treatment device | |
| CN116692981A (en) | Recycling treatment process and treatment system for nitrobenzene wastewater | |
| CN216863941U (en) | Waste water treatment device | |
| CN103449635A (en) | Treatment method of reverse osmosis concentrated water of coking wastewater | |
| CN219860879U (en) | Be used for landfill leachate nanofiltration concentrate full quantification processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200626 |
|
| RJ01 | Rejection of invention patent application after publication |