CN100431979C - Comprehensive process of treating alkaline waste water from alumina plant and domestic sewage - Google Patents
Comprehensive process of treating alkaline waste water from alumina plant and domestic sewage Download PDFInfo
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- CN100431979C CN100431979C CNB2006101677081A CN200610167708A CN100431979C CN 100431979 C CN100431979 C CN 100431979C CN B2006101677081 A CNB2006101677081 A CN B2006101677081A CN 200610167708 A CN200610167708 A CN 200610167708A CN 100431979 C CN100431979 C CN 100431979C
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- water
- waste water
- alkaline waste
- sanitary sewage
- alumina
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- 239000002351 wastewater Substances 0.000 title claims abstract description 58
- 239000010865 sewage Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 230000008569 process Effects 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 78
- 239000003513 alkali Substances 0.000 claims abstract description 11
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- 239000003518 caustics Substances 0.000 claims abstract description 6
- 238000004062 sedimentation Methods 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 9
- 238000005189 flocculation Methods 0.000 claims description 8
- 230000016615 flocculation Effects 0.000 claims description 8
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 2
- 239000007859 condensation product Substances 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 239000002244 precipitate Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000011282 treatment Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- -1 aluminum ion Chemical class 0.000 abstract description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 2
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 23
- 239000000126 substance Substances 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 239000003921 oil Substances 0.000 description 7
- 239000004519 grease Substances 0.000 description 6
- 238000000746 purification Methods 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 229910004298 SiO 2 Inorganic materials 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000006228 supernatant Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000003851 biochemical process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 238000011284 combination treatment Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 150000005837 radical ions Chemical class 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention is process of comprehensively treating alkaline waste water from alumina plant and domestic sewage, and relates to sewage treatment. The process features that alkaline waste water from alumina plant is added into domestic sewage so that the caustic alkali, sodium carbonate, aluminum ion and flocculant in the waste water is utilized to treat the sewage and treated water is used for the production of alumina plant. The present invention has low treating cost, elimination of alone sewage treating system, increased water source, and environment friendship.
Description
Technical field
The method of comprehensive treating process alkaline waste water from alumina plant and sanitary sewage relates to a kind of sewage water treatment method, particularly utilizes alkaline waste water from alumina plant to handle the industrial sewage of sanitary sewage and the integrated conduct method of sanitary sewage.
Background technology
Have a large amount of waste water and produce in daily production and life, it is water resources comprehensive utilization and environment protection needs that waste water is effectively handled.
At present, the generalized flowsheet for the treating processes of sewage is
General treatment scheme is adopted in processing for sanitary sewage usually.Because the main composition characteristic of sanitary sewage is pH7～8, organic object height (COD
Cr200～300mg/L), ammonia nitrogen (20～60mg/L), suspended substance (30～50mg/L), turbidity (120～200), basicity (200～250mg/L Na
2O), also has Al
3+(about 10mg/L), SiO
2(10～20mg/L), Ca
2+(on a small quantity).Sanitary sewage mainly adopts biochemical process to handle, and the flow process complexity of domestic sewage processing method, fabrication cost height need to add water conditioner (aluminiferous more), processing cost height.
And the trade effluent that produces in the alumina producer production process is to contain positively charged ion Na
+(in a large number), K
+(on a small quantity), Al
3+(10～200mg/L), negatively charged ion OH
-(pH9～13), CO
3 2-(100～2000mg/L), SO
4 2-(on a small quantity), Cl
-(on a small quantity), ammonia nitrogen (less than 7mg/L), SiO
2(5mg/L), also has basicity (150～3000mg/L Na
2O), COD
Cr(50～80mg/L), suspended substance (about 80mg/L), residual flocculation agent, the alkaline waste water of turbidity (30～60).
At present, the treatment process of alkaline waste water from alumina plant is after the Waste Water Centralized, carry out preliminary precipitation successively, isolate the oil slick thing, add water conditioner, filtering-depositing, draining (reuse water), the water after the processing mainly contains and is used for being back to Production Flow Chart after boiler flushing cinder, dedusting or branch matter are handled.
In the alumina producer factory effluent, owing to contain compositions such as caustic alkali, carbonic acid alkali, aluminium, flocculation agent in the waste water, treating processes need be to handling mentioned component especially especially, abandons along with the process of water treatment enters in the mud.
And caustic alkali, carbonic acid alkali, aluminium, flocculation agent are to can be used as the useful treatment agent of sanitary sewage disposal process.In existing sewage treatment process, the processing of sanitary sewage needs the additional water treatment agent on the one hand, on the other hand in the treating processes of alumina producer factory effluent, causing compositions such as useful component caustic alkali, carbonic acid alkali, aluminium, flocculation agent to enter to abandon mud and abandon wherein the treatment agent that can be used as production waste again, caused comprehensive benefit poor, the cost height of wastewater treatment.
Summary of the invention
The objective of the invention is deficiency, provide a kind of and can effectively improve treatment effect, the comprehensive treating process alkaline waste water from alumina plant that reduces processing cost and the method for sanitary sewage at above-mentioned prior art existence.
The objective of the invention is to be achieved through the following technical solutions.
The method of comprehensive treating process alkaline waste water from alumina plant and sanitary sewage, it is characterized in that alkaline waste water from alumina plant is joined in the sanitary sewage, utilize caustic alkali, carbonic acid alkali, aluminum ion, residual flocculation agent in the alkaline waste water of alumina producer that production waste is handled as the reuse of alumina producer water of productive use.
The method of comprehensive treating process alkaline waste water from alumina plant of the present invention and sanitary sewage, it is characterized in that its treating processes is that head utilizes the grid branch that waste water is carried out removal of impurities, after mixing by alkaline waste water and sanitary sewage then, leave standstill coagulative precipitation, mixing water after the precipitate and separate is discharged, carry out entering clean water basin after oil removing and secondary staticly settle, be used for the reuse of alumina producer water of productive use.
The method of comprehensive treating process alkaline waste water from alumina plant of the present invention and sanitary sewage, it is characterized in that its treating processes is at first to utilize grid to isolate the bulk foreign material, then with alkaline waste water and sanitary sewage by 0.4～3: after 1 volume ratio mixes, pump into preliminary sedimentation tank, after stirring 5min～10min at normal temperatures, the condensation product that the standing separation precipitation produces removes the oil slick treating processes again and obtains reuse water.
In alkaline waste water from alumina plant processing of the present invention and the purifying domestic sewage treatment process, it is that multiple, complicated physics and chemical reaction process have taken place simultaneously that alkaline waste water from alumina plant is handled sanitary sewage, mainly comprises the following mechanism of action.
(1) neutralizing effect: contain a certain amount of OH in the alkaline waste water
-, it can in and inorganic weak acid and organic monoacid in the sanitary sewage, and destroy its gluey equilibrium state that exists, impel precipitation to separate out.
(2) Decomposition: highly basic can break the loop section organism, and its effect changes organic existence.
(3) hydrolytic action: before alkaline waste water and sanitary sewage mixed, the various compositions many places in the water were in relative balance state, and after the mixing, the basicity of alkaline waste water reduces, and the basicity of sanitary sewage raises, and its effect impels metal ion generation hydrolysis reaction, and precipitation is separated out.
(4) precipitating action: contain a certain amount of weak acid radical ion in the alkaline waste water, hardness is very low, and the hardness of sanitary sewage is higher.After the mixing, weak acid root and new organic monoacid part and the Ca that produces
2+Precipitin reaction takes place, and precipitation is separated out.
(5) throwing out: contain a spot of flocculation agent and suspended substance in the alkaline waste water, after the mixing,, make inorganic and organic compositions a large amount of in the water can be adsorbed, condense again by neutralization, hydrolysis, precipitating action, and the precipitation separate out, water quality is purified.
In process of the test, considered following parameter and the index of influencing at method of the present invention.
(1) temperature, pH, basicity, turbidity, ammonia nitrogen, the chemical oxygen demand (COD of detection alkaline waste water from alumina plant and sanitary sewage
Cr), composition such as suspended substance (SS), aluminium, iron, silicon.
The composition decrement is calculated: alkaline waste water from alumina plant has changed the concentration of certain composition in the former water with after sanitary sewage mixes, and weighs after two kinds of water mutual effects influence to component content with this.
Composition decrement=mB
1+ nB
2-B (1)
Purification rate calculates: alkaline waste water from alumina plant is with after sanitary sewage mixes, and effect has taken place two kinds of water quality, impels a certain constituent concentration reduction in the water, and water quality is purified.
In the formula: B
1, B
2--a certain constituent concentration in two kinds of water, mg/L;
A certain constituent concentration after two kinds of water of B--are mixed in proportion, mg/L;
The volume fraction that two kinds of water of m, n--are mixed in proportion.
(2) test method.Get the alkaline waste water from alumina plant and the sanitary sewage (proportioning=alkaline waste water volume: the sanitary sewage volume) in 1 liter of beaker of certain volume, behind the mixing (stirring or heating), move in 1 liter of graduated cylinder and leave standstill, measure temperature, and measure the turbidity of supernatant liquor at different time.After placing certain hour, get supernatant liquor and measure pH, basicity, COD
Cr, composition such as SS, ammonia nitrogen, aluminium, iron, silicon.
(3) test temperature is to the influence of settling velocity.At 5 ℃～35 ℃, influenced by water temperature very little for the settling velocity of suspended substance in the sanitary sewage; The settling velocity of suspended substance is along with the rising of water temperature in the alkaline waste water from alumina plant, and settling velocity is slightly accelerated; Mixed water temperature is high more, and flocculation settling velocity is fast more, and basicity is big more, and Temperature Influence is obvious more.
(4) test stirring and temperature are to the influence of settling velocity.When temperature was hanged down, stirring had obviously short settlement action, and when temperature was high, stirring action was not obvious; Churning time is selected 5min～10min.
(5) decontamination effect improving of different mixing proportion.The pH value and the basicity of ratio of mixture and alkaline waste water from alumina plant have bigger relation, and the ability of the wastewater treatment sanitary sewage that the pH value is high more, basicity is big more is big more.Usually, when alkaline waste water pH＜10, ratio of mixture is selected 3: 1; When pH=10～11, ratio of mixture is selected 1: 1; When pH＞11, the sanitary sewage ratio of mixture can suitably improve, and maximum should not be above 1: 3.
In blending ratio 0.4～3: 1 scope, basicity (Na
2O) decrement is at 139～312mg/L, and purification rate is 21%～26%.The ammonia nitrogen decrement is at 2.2mg/L, and purification rate is about 10%.COD
CrDecrement is at 16～61mg/L, and purification rate is more than 30%.The SS decrement is at 9～33mg/L, and purification rate is 12～62%.If the selection optimum operation condition, various composition purification rates can further improve.
(6) Al in the sanitary sewage
2O
3, SiO
2Content all below 25mg/L, Fe
2O
3Content is below 2mg/L; Al in the alkaline waste water
2O
3The content fluctuation range is bigger, generally increases SiO with the rising of basicity
2Content below 5mg/L, Fe
2O
3Content is below 0.2mg/L.After two kinds of water are pressed the different ratios mixing, Fe
2O
3The content no change, Al
2O
3, SiO
2Content obvious reduction is all arranged, Al in the water is described
2O
3The effect of the throw out of promotion flocculating settling is arranged.
Method of the present invention, with alkaline waste water from alumina plant and processing sanitary sewage, according to alkaline waste water pH value, press alkaline waste water: sanitary sewage 0.4～3: 1 mixed, stir at normal temperatures, composition interaction throw out quickens sedimentation in the water, leave standstill, remove oil slick, further secondary sedimentation, separate, produce the reuse water that satisfies alumina producing reuse requirement.Can overlap water processing establishment with one, alkaline waste water from alumina plant and sanitary sewage combination treatment, need not additionally add water conditioner, two kinds of compositions in the water quality are fully acted on, water quality is purified, through separating treatment, make water quality satisfy the requirement of alumina producer reuse water, with the purpose that reaches " treatment of wastes with processes of wastes against one another ", reduces the water processing establishment investment, reduces daily water treatment running cost, reduces the water of productive use cost, saves new water source.
Description of drawings
Fig. 1 is the process flow sheet of the inventive method.
Embodiment
At first utilize grid to isolate the bulk foreign material, then according to alkaline waste water from alumina plant pH value, press alkaline waste water and handle sanitary sewage 0.4～3: 1 mixed, mix the back and be promoted to preliminary sedimentation tank with pump, stir 5min～10min at normal temperatures, make that composition fully acts in two kinds of water quality, throw out in the water is condensed into bulk and sinks at the bottom of the pond, leave standstill, mixing water is discharged from preliminary sedimentation tank, removes oil slick thing in the water with being pumped to grease removal tank, the grease removal tank water outlet is with being pumped to secondary sedimentation basins, through leaving standstill, clear water is pumped into clean water basin from settling tank again, promptly gets the reuse water that satisfies the reuse requirement.
Embodiment 1
When alkaline waste water from alumina plant pH value was 10.2, alkaline waste water mixed by 2: 1 volume ratio with sanitary sewage, and preliminary sedimentation tank each factor concentration that enters the mouth is: pH10.1, total alkalinity 740mg/L, suspended substance 777mg/L, COD
CR180mg/L, mix the back and be promoted to preliminary sedimentation tank, stir 5min at normal temperatures, make that composition fully acts in two kinds of water quality with pump, throw out in the water is condensed into bulk and sinks at the bottom of the pond, leave standstill 1.5h, mixing water is discharged from preliminary sedimentation tank, removes oil slick thing in the water with being pumped to grease removal tank, the grease removal tank water outlet is with being pumped to secondary sedimentation basins, through leaving standstill 1.5h, clear water is pumped into clean water basin from settling tank again, promptly gets the reuse water that satisfies the reuse requirement.Each factor concentration of clean water basin is: pH10.1, total alkalinity 410mg/L, suspended substance 84mg/L, COD
CR57mg/L satisfies the reuse water requirement.
Embodiment 2
When alkaline waste water pH value was 11.5, alkaline waste water was handled sanitary sewage and was mixed by 1: 2, and preliminary sedimentation tank each factor concentration that enters the mouth is: pH11.4, total alkalinity 730mg/L, suspended substance 996mg/L, COD
CR354mg/L, mix the back and be promoted to preliminary sedimentation tank, stir 10min at normal temperatures, make that composition fully acts in two kinds of water quality with pump, throw out in the water is condensed into bulk and sinks at the bottom of the pond, leave standstill 1.6h, mixing water is discharged from preliminary sedimentation tank, removes oil slick thing in the water with being pumped to grease removal tank, the grease removal tank water outlet is with being pumped to secondary sedimentation basins, through leaving standstill 1.5h, clear water is pumped into clean water basin from settling tank again, promptly gets the reuse water that satisfies the reuse requirement.Each factor concentration of clean water basin is: pH9.8, total alkalinity 560mg/L, suspended substance 68mg/L, COD
CR103mg/L satisfies the reuse water requirement.
Embodiment 3
When alkaline waste water pH value was 12, alkaline waste water was handled sanitary sewage and was mixed by 1: 3, and preliminary sedimentation tank each factor concentration that enters the mouth is: pH11.7, total alkalinity 938mg/L, suspended substance 547mg/L, COD
CR242mg/L, other condition is with example 1, and each factor concentration of clean water basin is after handling: pH9.1, total alkalinity 290mg/L, suspended substance 48mg/L, COD
CR116mg/L satisfies the reuse water requirement.
Claims (3)
1. the method for comprehensive treating process alkaline waste water from alumina plant and sanitary sewage, it is characterized in that alkaline waste water from alumina plant is joined in the sanitary sewage, utilize caustic alkali, carbonic acid alkali, aluminum ion, residual flocculation agent in the alkaline waste water of alumina producer that sanitary sewage is handled as the reuse of alumina producer water of productive use.
2. the method for comprehensive treating process alkaline waste water from alumina plant according to claim 1 and sanitary sewage, it is characterized in that its treating processes is at first to utilize grid to separate waste water is carried out removal of impurities, after mixing by alkaline waste water and sanitary sewage then, leave standstill coagulative precipitation, mixing water after the precipitate and separate is discharged, carry out entering clean water basin after oil removing and secondary staticly settle, be used for the reuse of alumina producer water of productive use.
3. the method for comprehensive treating process alkaline waste water from alumina plant according to claim 1 and sanitary sewage, it is characterized in that its treating processes is at first to utilize grid to isolate the bulk foreign material, then with alkaline waste water and sanitary sewage by 0.4～3: after 1 volume ratio mixes, pump into preliminary sedimentation tank, after stirring 5min～10min at normal temperatures, the condensation product that the standing separation precipitation produces removes the oil slick treating processes again and obtains reuse water.
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|---|---|---|---|
| CNB2006101677081A CN100431979C (en) | 2006-12-19 | 2006-12-19 | Comprehensive process of treating alkaline waste water from alumina plant and domestic sewage |
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| CN100431979C true CN100431979C (en) | 2008-11-12 |
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| CN107473466B (en) * | 2017-08-10 | 2020-07-21 | 中国铝业股份有限公司 | Treatment method of beneficiation wastewater |
| CN111848336A (en) * | 2020-07-21 | 2020-10-30 | 安徽金轩科技有限公司 | Method for treating galaxolide musk waste aluminum water |
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|---|---|---|---|---|
| CN1413914A (en) * | 2002-12-06 | 2003-04-30 | 中国铝业股份有限公司 | Method for using rejuvenated water obtained from treated alumina waste water |
| CN1765776A (en) * | 2004-10-27 | 2006-05-03 | 贵阳铝镁设计研究院 | Electrolytic aluminium factory production waste water disposal method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1413914A (en) * | 2002-12-06 | 2003-04-30 | 中国铝业股份有限公司 | Method for using rejuvenated water obtained from treated alumina waste water |
| CN1765776A (en) * | 2004-10-27 | 2006-05-03 | 贵阳铝镁设计研究院 | Electrolytic aluminium factory production waste water disposal method |
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| Title |
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| 氧化铝工业废水的控制与有效利用. 朱建军.有色金属，第55卷第增刊期. 2003 * |
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Effective date of registration: 20180622 Address after: No. 22, Shanghai Street District, front road, 450041 Zhengzhou, Henan Co-patentee after: Aluminum Corporation of China Limited Patentee after: Chalco Mining Co., Ltd. Address before: 100814 Beijing Haidian District Fuxing Road 12, China Aluminum Limited by Share Ltd Patentee before: Aluminum Corporation of China Limited |
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