CN1200887C - Method for treating highly acid-basic industrial sewage by metal aluminium - Google Patents
Method for treating highly acid-basic industrial sewage by metal aluminium Download PDFInfo
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- CN1200887C CN1200887C CN 03115309 CN03115309A CN1200887C CN 1200887 C CN1200887 C CN 1200887C CN 03115309 CN03115309 CN 03115309 CN 03115309 A CN03115309 A CN 03115309A CN 1200887 C CN1200887 C CN 1200887C
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- sewage
- aluminium
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- high alkalinity
- metallic aluminium
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- Treatment Of Water By Oxidation Or Reduction (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention discloses a method for processing industrial sewage having high acidity and high alkalinity by metallic aluminium, which relates to a method for processing industrial sewage having high acidity and high alkalinity, particularly to a method for processing dye printing sewage having high acidity and high alkalinity. The present invention has the technical scheme that metallic aluminium is used as a filter bed used for water processing, and the pH value of the sewage having high acidity or high alkalinity is regulated according to the intensity extent of the released hydrogen gas allowed by sewage processing; thus, the sewage can flow circularly in a filter chamber, and the sewage has full reaction time in the filter chamber; then, the pH value of the sewage is regulated, and a flocculating agent is further generated; suspended solid and colloid in the sewage are agglomerated and are precipitated with soluble contaminants in the sewage, and the sewage is processed and is purified. The present invention can process the sewage having high acidity and high alkalinity directly, the chemicals dosage for regulating the pH value is reduced; because the metallic aluminium is used as waste material of workpiece processing, the cost of water processing can be effectively reduced; in addition, the present invention for processing sewage has the advantages of less generated sewage sludge and good settleability; the present invention is favorable for sewage purification.
Description
Technical field
The present invention relates to the method for the processing of overbased acidic, high alkalinity industrial sewage, be particularly useful for processing peracid, high alkalinity dyeing and printing sewage.
Background technology
Coloured, difficult degradation industrial sewage is the key subjects that ambient water is handled always, for solving this difficult problem, has developed various treatment processs.Internal electrolysis of iron method, iron charcoal internal electrolysis and the catalytic reduction internal electrolysis of iron method of wherein utilizing metal processing depleted iron filings to make filter bed play certain effect to the processing of this class sewage.
But to some industrial sewages acid or alkalescence is very high, as dyeing and printing sewage, owing in dyeing process, often added a large amount of caustic soda, so its pH value is very high, often more than 11, and the acidity of some chemical engineering sewage is very strong, pH＜3.As using the coagulating agent flocculation sediment, dosage is very big to the processing of these peracidities or high alkalinity industrial sewage, and the pH that regulates sewage also will consume a large amount of acid or alkali.Therefore still very difficult to the processing of this class sewage.If handle with catalyzed iron internal electrolysis process, copper may be corroded (such as generating ventilation breather) under the highly basic condition, and the effect of water treatment is bad.
Summary of the invention
The objective of the invention is to disclose a kind of efficient and economic processing peracid or the treatment process of high alkalinity industrial sewage.The present invention adopts the filter bed of metallic aluminium as water treatment, because aluminium is a kind of amphoteric metal, promptly it can generate the salt that aluminium is metal ion with acid-respons, also can generate aluminate with alkali reaction.Though often there is layer oxide film on the surface of aluminium, this layer Al
2O
3Film also has both sexes, generates aluminum metal ionic salt with acid-respons in acidic solution, generates aluminate with alkali reaction in basic solution, but does not influence whole treatment reaction.Consumed a certain amount of bronsted lowry acids and bases bronsted lowry in the treatment reaction process, made the pH of sewage close to neutrality.
These aluminium salt that reaction generates in the water treatment procedure are hydrolyzed to Al (OH) under certain pH
3, have very strong throwing out, suspended solids, coacervation of colloid precipitation in the sewage can be adsorbed great amount of soluble organic pollutant coprecipitation simultaneously, make sewage obtain handling and purifying.
Have hydrogen and emit in the reaction process of water treatment, hydrogen can be collected by gathering system and utilize.If there is not a hydrogen collection, in order to prevent the combustion of hydrogen blast, can reduce speed of response reducing the severe degree that hydrogen is emitted, the pH of sewage is transferred to about 11 (or about 3) hydrogen is slowly emitted, at this moment available fans in time dispels it.
The inventive method concrete steps are as follows:
The first step: form filter bed with metallic aluminium and put into the filter tank, metallic aluminium can be the leftover bits of aluminium flake, aluminium bits, aluminium powder, aluminium ball or aluminium.The severe degree that the hydrogen that pending sewage is allowed according to water treatment discharges, the pH value of regulating peracidity or high alkalinity sewage.
Second step: allow sewage flow at the filter tank internal recycle, during because of reaction gas discharged stirring action, reflux ratio is made as 0: 1～3: 1, and makes sewage that the sufficient reaction times be arranged in the filter tank.
The 3rd step: after reaction finishes, the pH of sewage is transferred to 6.0～9.0, makes the Al of generation
3+Further generate flocculating agent A l (OH)
3, with suspended solids, coacervation of colloid in the sewage, and the solubility pollutent coprecipitation in the absorption sewage, make sewage obtain handling and purifying.
Advantage of the present invention is as follows:
The inventive method can directly be handled under original peracidity of sewage or high alkalinity condition, has reduced the pharmaceutical quantities of regulating pH; Compare with coagulation sedimentation method, saved the expense of using coagulating agent; The employed aluminium of the inventive method is the waste material of metal works processing, and processing costs is cheap, can effectively lower the cost of water treatment; And the inventive method to carry out the sludge produced by sewage treatment amount few, and settling property might as well, help the purification of sewage.
Embodiment
Embodiment 1: with method of the present invention dye wastewater is handled.
Dying of industry sewage is amaranth, pH=13.5.
The first step: form filter bed with industrial depleted aluminium bits.
Second step: allow sewage at the filter tank of above-mentioned filter bed internal recycle with 0: 1 reflux ratio, hydraulic detention time is 45 minutes, makes sewage reaction fully in the filter tank.
The 3rd step: transfer the pH to 9.0 of sewage, quiescent setting 30 minutes, the result who surveys its supernatant liquor is by shown in the table 1.
Table 1: strong basicity dye wastewater treatment effect
| The sewage kind | COD (mg/l) before handling | Handle back COD (mg/l) | Decolorizing effect |
| Basic dye sewage | 690 | 480 | Amaranth → greenish orange look |
Embodiment 2: with the inventive method acid dyeing and printing sewage is handled.
Certain printing and dyeingization sewage is mazarine, pH=3.8.
The first step: form filter bed with industrial depleted aluminium bits.
Second step: allow sewage at the filter tank of above-mentioned filter bed internal recycle with 3: 1 reflux ratios, hydraulic detention time is 1.5 hours, makes sewage fully reaction in the filter tank.
The 3rd step: transfer about the pH to 6.0 of sewage, quiescent setting 30 minutes, the result who records supernatant liquor is by shown in the table 2.
Table 2: acid dyeing and printing sewage treatment effect
| The sewage kind | COD (mg/l) before handling | Handle back COD (mg/l) | Decolorizing effect |
| Basic dye sewage | 420 | 270 | Mazarine → light blue |
Above-mentioned example only is the part example in the inventive method, not as the qualification to the inventive method.
Claims (2)
1. metallic aluminium is handled the method for peracid, high alkalinity industrial sewage, it is characterized in that: adopt the filter bed of metallic aluminium as water treatment, by, the first step: form filter bed with metallic aluminium and put into the filter tank, the severe degree that the hydrogen that the sewage that enters the filter tank is allowed according to sewage disposal discharges, the pH value of regulating peracidity or high alkalinity sewage; Second step: allow sewage flow at the filter tank internal recycle, reflux ratio is made as 0: 1～3: 1, and makes sewage that the sufficient reaction times be arranged in the filter tank; The 3rd step: after reaction finishes, the pH of sewage is transferred to 6.0～9.0, makes the Al of generation
3+Further generate flocculating agent A l (OH)
3, with suspended solids, coacervation of colloid in the sewage, and the solubility pollutent coprecipitation in the absorption sewage, make sewage obtain handling and purifying.
2. the method for processing peracid according to claim 1, high alkalinity industrial sewage is characterized in that: metallic aluminium is the leftover bits of aluminium flake, aluminium bits, aluminium powder, aluminium ball or aluminium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03115309 CN1200887C (en) | 2003-01-31 | 2003-01-31 | Method for treating highly acid-basic industrial sewage by metal aluminium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03115309 CN1200887C (en) | 2003-01-31 | 2003-01-31 | Method for treating highly acid-basic industrial sewage by metal aluminium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1470463A CN1470463A (en) | 2004-01-28 |
| CN1200887C true CN1200887C (en) | 2005-05-11 |
Family
ID=34152586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03115309 Expired - Fee Related CN1200887C (en) | 2003-01-31 | 2003-01-31 | Method for treating highly acid-basic industrial sewage by metal aluminium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1200887C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102887582A (en) * | 2012-10-18 | 2013-01-23 | 同济大学 | Advanced oxidation water treatment method of Fe0-Al0/O2 system |
| CN103910425A (en) * | 2014-04-23 | 2014-07-09 | 华中师范大学 | Method for treating organic wastewater by use of aluminum scrap pop-top can |
| CN111285445B (en) * | 2020-03-27 | 2021-09-21 | 中国科学院生态环境研究中心 | Method for removing halogenated organic pollutants in water by utilizing zero-valent aluminum and copper oxide |
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2003
- 2003-01-31 CN CN 03115309 patent/CN1200887C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1470463A (en) | 2004-01-28 |
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