CN102351383A - Method for treating sewage generated in ammonia synthesis process using coal as raw material - Google Patents
Method for treating sewage generated in ammonia synthesis process using coal as raw material Download PDFInfo
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- CN102351383A CN102351383A CN2011102636658A CN201110263665A CN102351383A CN 102351383 A CN102351383 A CN 102351383A CN 2011102636658 A CN2011102636658 A CN 2011102636658A CN 201110263665 A CN201110263665 A CN 201110263665A CN 102351383 A CN102351383 A CN 102351383A
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Abstract
The invention provides a method for treating sewage generated in the ammonia synthesis process using coal as a raw material. The method comprises the following steps of: settling sewage sediments, introducing the sediments into a first-stage anaerobic tank, a first-stage oxic tank, a second anaerobic tank and a second-stage oxic tank sequentially, and performing two-stage anaerobic/oxic (A/O) biochemical treatment to reduce ammonia nitrogen content and chemical oxygen demand in the sewage, wherein the sewage is subjected to denitrification in the first-stage anaerobic tank and the second-stage anaerobic tank, and is subjected to nitrosation in the first-stage oxic tank and the second-stage oxic tank. The method is characterized by comprising the following step of: putting glucose and sodium acetate in the weight ratio of 1:(3-15) into the second-stage anaerobic tank, wherein 0.4 to 0.5 kilogram of glucose and sodium acetate are put into each ton of sewage according to the total addition amount. The glucose and the sodium acetate are mixed and matched according to a proportion, so that the method has a good treatment effect on the sewage and is lower in cost. Simultaneously, after the glucose and the sodium acetate are added according to the proportion, compared with a method in which white sugar and the glucose are purely added, the method has the advantages that: the total addition amount of a carbon source can be reduced.
Description
Technical field
The invention belongs to the technical field of disposing of sewage, be meant that specifically a kind of is the method for disposing of sewage in the synthetic ammonia of raw material with the coal.
Background technology
With the coal is the Ammonia Production enterprise of raw material, and feed coal can be discharged great amount of wastewater in gas making, desulfurization, decarburization, refining, ammonia synthesis process.Owing to contain elements such as carbon, hydrogen, oxygen, nitrogen, sulphur in the coal; In retort process, be transformed into the organic and mineral compound of various oxygen, nitrogen, sulphur; Make in the phlegma of moisture and steam in the coal gas and contain multiple poisonous and hazardous pollutent (nitrogen, phenolic compound, prussiate and sulfide etc.), belong to one of trade effluent of refractory reason.How to remove and contain ammonia nitrogen in high density, organic sewage, become with the coal be raw material ammonia enterprise the difficult problem that must face.
With the coal is the Ammonia Production enterprise of raw material, and the selection of sewage treatment process has determined the cost of sewage disposal.
The method of sewage disposal ammonia nitrogen waste water denitrogenation has physics method, chemical method and biological process etc.Physical method has reverse osmosis, distillation, stripping, soil irrigation; Chemical method has ion exchange method, break point chlorination, electrochemical treatment, catalytic pyrolysis; Bioremediation mainly contains activated sludge process and biomembrance process.On the basis of conventional activated sludge process, develop out kinds of processes again, like AO method, MBR method etc.; Biomembrance process mainly contains biological contact oxidation process, blodisc etc., and is in the majority to choose biochemical processing method in the above method.
To being that waste water control that the synthetic ammonia of raw material produces adopts that to select two-stage A/O biochemical processing process, the characteristics of this technology for use be anoxic, aerobic alternate run with the coal.The anoxic segment process is incomplete anaerobic technique, mainly be with larger molecular organics in the water become small organic molecule, insoluble organism is converted into dissolved organic matter, improves the biochemical of waste water, is that follow-up aerobic treatment is created good condition.The aerobic treatment process then be aerobic microbiological under the condition of aerobic, a part of organism in the waste water is used for synthetic new cell, another part organism is carried out katabolism so that obtain the synthetic required energy of cell, its final product is CO
2And H
2O.
The ultimate principle of biological denitrificaion is the effect through the nitrification and denitrification bacterium; Ammonia-state nitrogen decomposing oxidation in the sewage is become nitrous acid nitrogen and nitrate nitrogen; This is reflected under the aerobic condition and carries out, and through denitrification nitric nitrogen is changed into nitrogen again, thereby reaches the purpose of denitrogenation from waste water.The nitrated stage is the process that the ammonia nitrogen in the sewage is oxidized to nitrite nitrogen or nitrate nitrogen; The denitrification stage is the process that the nitrate that will produce in the nitrifying process or nitrite are reduced into nitrogen.
In the two-stage A/O sewage treatment process, the removal of nitrogen nitrogen needs competent carbon source, could guarantee normally carrying out of anti-nitration reaction.The environmental factors that influences anti-nitration reaction is the carbon source in the sewage, and the source of carbon source is mainly carbon source contained in the sewage and additional carbon.With the coal is the Ammonia Production enterprise of raw material, and C in the waste water of its discharging: N ratio is generally near 1: 1 (even less than 1, that is to say that the concentration of COD is lower than ammonia nitrogen concentration in the sewage).When carbon in the sewage, when nitrogen ratio is high, like BOD
5During/TN value＞3-5, show that carbon source is sufficient, does not need additional carbon; Carbon, nitrogen ratio are low excessively in sewage, as, like BOD
5During/TN＜3-5, just need add organic carbon source in addition.
For a long time, methyl alcohol, white sugar (or cerelose) are used in adding of biochemical sewage disposal carbon source always, and methyl alcohol belongs to the dangerization article, in use not only have very big danger, and very strict to operative employee's requirement, generally will not adopt.Owing to add existing problem with methyl alcohol as carbon source, adding of carbon source has to select white sugar or cerelose in the biochemical sewage treatment process, and the ton cost of sewage disposal is up to 2.2-2.6 unit/ton.
Summary of the invention
The objective of the invention is to provide a kind of according to above-mentioned deficiency is the method for disposing of sewage in the synthetic ammonia of raw material with the coal, and it can reach the industrial discharge standard, can save cost simultaneously.
The present invention realizes through following technical scheme: a kind of is the method for disposing of sewage in the synthetic ammonia of raw material with the coal; It comprises and will pass through the one-level anaerobic pond behind the sewage sediment successively; The one-level Aerobic Pond; Carry out two-stage A/O biochemical treatment in secondary anaerobic pond and the secondary aerobic pond to reduce ammonia-nitrogen content and the chemical oxygen demand in the sewage; Wherein sewage carries out denitrification in one-level anaerobic pond and secondary anaerobic pond; In one-level Aerobic Pond and secondary aerobic pond, carry out nitrosification; It is characterized in that: dropping into weight ratio to the secondary anaerobic pond is 1: the glucose of 3-15 and sodium acetate, the total amount that adds of glucose and sodium acetate is that sewage per ton adds 0.4-0.5 kilogram glucose and sodium acetate.
The weight ratio that said glucose and sodium acetate add is 1: 5-10.
The present invention adds glucose and sodium acetate as supplementary carbon source be because the glucose biochemical property is good, belongs to the organic compound of relative complex, but biodegradability is slowly complicated, and price higher (3500-4500 ton, 3400 yuan/ton of glucose inferior).And sodium acetate is easy to dissolving, hydrolysis and be easy to absorb into microorganism price lower (cost of the sodium acetate of purity 45% is 2500 yuan/ton).Therefore utilize the relative merits of glucose and sodium acetate, glucose and sodium acetate are carried out mixing match in proportion, sewage is handled, not only effective, and also cost is lower.Simultaneously, after glucose and sodium acetate proportioning added, and add white sugar merely or glucose is compared, can also reduce the total amount that adds of carbon source.
Embodiment
Below further specify the present invention through specific embodiment:
Embodiment 1
With ammonia nitrogen concentration is 200-240mg/l; COD (chemical oxygen demand) concentration is the sewage of 170-200mg/L; After process sediment oil trap is removed suspended substance, petroleum-type; Be cooled to 35-40 ℃ through cooling tower again, get into A1 (one-level anaerobic pond), O1 (one-level Aerobic Pond), A2 (secondary anaerobic pond), O2 (secondary aerobic pond) pond successively.
The A1 pond utilizes the carbon source in the sewage to carry out denitrification.Nitrosification is carried out to the ammonia nitrogen in the sewage in the O1 pond.The A2 pond is that carbon source adds a little, and sewage is carried out further denitrification, realizes that nitrogen nitrogen is up to standard.The O2 pond is that the excessive carbon source that exists in the aforementioned process treatment process is decomposed, and reduces COD, realizes that COD is up to standard.Wherein the carbon source that in the A2 pond, adds is glucose and the sodium acetate mixture in 1: 3 ratio proportioning, and the total amount that adds is that sewage per ton adds 0.4 kilogram.
The chemical reaction that said process takes place is following:
2NH
4 ++3O
2——2NO
2 -+4H
++2H
2O+Q°
2NO
2 -+O
2——2NO
3 -+Q°
6NO
3 -+5CH
3OH——5CO
2+3N
2+7H
2O+6OH
-
The biochemical sludge partial reflux that system produces is to biochemical system, and excess sludge discharge is to sludge thickener, carries out mechanical dehydration after tentatively subtracting appearance, and dried mud is transported outward processing.
Embodiment 2
With ammonia nitrogen concentration is 200-240mg/l, and COD (chemical oxygen demand) concentration is the sewage of 170-200mg/L, after process sediment oil trap is removed suspended substance, petroleum-type, is cooled to 35-40 ℃ through cooling tower again, gets into A1, O1, A2, O2 pond successively.In the A2 pond, add carbon source, carbon source is glucose and the sodium acetate mixture in 1: 15 ratio proportioning, and the total amount that adds is that sewage per ton adds 0.5 kilogram.
The biochemical sludge partial reflux that system produces is to biochemical system, and excess sludge discharge is to sludge thickener, carries out mechanical dehydration after tentatively subtracting appearance, and dried mud is transported outward processing.
Embodiment 3
With ammonia nitrogen concentration is 200-240mg/l, and COD (chemical oxygen demand) concentration is the sewage of 170-200mg/L, after process sediment oil trap is removed suspended substance, petroleum-type, is cooled to 35-40 ℃ through cooling tower again, gets into A1, O1, A2, O2 pond successively.In the A2 pond, add carbon source, carbon source is glucose and the sodium acetate mixture in 1: 5 ratio proportioning, and the total amount that adds is that sewage per ton adds 0.45 kilogram.
The biochemical sludge partial reflux that system produces is to biochemical system, and excess sludge discharge is to sludge thickener, carries out mechanical dehydration after tentatively subtracting appearance, and dried mud is transported outward processing.
Embodiment 4
With ammonia nitrogen concentration is 200-240mg/l, and COD (chemical oxygen demand) concentration is the sewage of 170-200mg/L, after process sediment oil trap is removed suspended substance, petroleum-type, is cooled to 35-40 ℃ through cooling tower again, gets into A1, O1, A2, O2 pond successively.In the A2 pond, add carbon source, carbon source is glucose and the sodium acetate mixture in 1: 10 ratio proportioning, and the total amount that adds is that sewage per ton adds 0.5 kilogram.
The biochemical sludge partial reflux that system produces is to biochemical system, and excess sludge discharge is to sludge thickener, carries out mechanical dehydration after tentatively subtracting appearance, and dried mud is transported outward processing.
In the water quality after the inventive method processing, the nitrogen oxygen level is less than 25mg/L, and COD has reached the requirement of " ammonia synthesizing industry pollution discharge standard ", and significantly reduced processing cost less than 70mg/L.
Claims (2)
1. one kind is the method for disposing of sewage in the synthetic ammonia of raw material with the coal; It comprises and will pass through the one-level anaerobic pond behind the sewage sediment successively; The one-level Aerobic Pond; Carry out two-stage A/O biochemical treatment in secondary anaerobic pond and the secondary aerobic pond to reduce ammonia-nitrogen content and the chemical oxygen demand in the sewage; Wherein sewage carries out denitrification in one-level anaerobic pond and secondary anaerobic pond; In one-level Aerobic Pond and secondary aerobic pond, carry out nitrosification; It is characterized in that: dropping into weight ratio to the secondary anaerobic pond is 1: the glucose of 3-15 and sodium acetate, the total amount that adds of glucose and sodium acetate is that sewage per ton adds 0.4-0.5 kilogram glucose and sodium acetate.
2. according to claim 1 is the method for disposing of sewage in the synthetic ammonia of raw material with the coal, it is characterized in that: the weight ratio that said glucose and sodium acetate add is 1: 5-10.
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| CN2011102636658A CN102351383A (en) | 2011-09-07 | 2011-09-07 | Method for treating sewage generated in ammonia synthesis process using coal as raw material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058548A (en) * | 2013-03-22 | 2014-09-24 | 宝山钢铁股份有限公司 | Denitrification, desalination and recycling process of stainless steel cold rolling acidic waste water |
| CN108751423A (en) * | 2018-05-07 | 2018-11-06 | 湖南凯涛环保科技有限公司 | The efficient liquid sodium acetate carbon source of ammonia nitrogen in a kind of degrading waste water |
| CN109320011A (en) * | 2018-10-22 | 2019-02-12 | 新疆环境工程技术有限责任公司 | Municipal wastewater handles integrated technique |
Citations (3)
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| CN101337740A (en) * | 2008-08-13 | 2009-01-07 | 山东美泉环保科技有限公司 | Two-stage water supply bio denitrification system and process thereof |
| CN102040315A (en) * | 2010-10-21 | 2011-05-04 | 兖矿集团有限公司 | Method for treating high ammonia nitrogen wastewater by two-stage A/O process |
| CN102126811A (en) * | 2011-01-21 | 2011-07-20 | 北京建工环境发展有限责任公司 | Double-anoxic denitrification method and equipment for enhanced denitrification of sewage |
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2011
- 2011-09-07 CN CN2011102636658A patent/CN102351383A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101337740A (en) * | 2008-08-13 | 2009-01-07 | 山东美泉环保科技有限公司 | Two-stage water supply bio denitrification system and process thereof |
| CN102040315A (en) * | 2010-10-21 | 2011-05-04 | 兖矿集团有限公司 | Method for treating high ammonia nitrogen wastewater by two-stage A/O process |
| CN102126811A (en) * | 2011-01-21 | 2011-07-20 | 北京建工环境发展有限责任公司 | Double-anoxic denitrification method and equipment for enhanced denitrification of sewage |
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| 王伟: "《碳源及电子受体对反硝化除磷系统的影响研究》", 《中国优秀硕士学位论文全文数据库 工程科技I辑》, 28 February 2009 (2009-02-28), pages 027 - 277 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104058548A (en) * | 2013-03-22 | 2014-09-24 | 宝山钢铁股份有限公司 | Denitrification, desalination and recycling process of stainless steel cold rolling acidic waste water |
| CN104058548B (en) * | 2013-03-22 | 2016-03-30 | 宝山钢铁股份有限公司 | A kind of stainless-steel cold-rolling acid waste water denitrogenation desalination reuse technology |
| CN108751423A (en) * | 2018-05-07 | 2018-11-06 | 湖南凯涛环保科技有限公司 | The efficient liquid sodium acetate carbon source of ammonia nitrogen in a kind of degrading waste water |
| CN109320011A (en) * | 2018-10-22 | 2019-02-12 | 新疆环境工程技术有限责任公司 | Municipal wastewater handles integrated technique |
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Application publication date: 20120215 |