CN103304072A - Recycling method of industrial waste water - Google Patents

Recycling method of industrial waste water Download PDF

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Publication number
CN103304072A
CN103304072A CN2013102924300A CN201310292430A CN103304072A CN 103304072 A CN103304072 A CN 103304072A CN 2013102924300 A CN2013102924300 A CN 2013102924300A CN 201310292430 A CN201310292430 A CN 201310292430A CN 103304072 A CN103304072 A CN 103304072A
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Prior art keywords
water
waste water
reverse osmosis
calcium
reuse
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CN2013102924300A
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CN103304072B (en
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李克平
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FOSHAN NANHAI DALI DATONG JINWEI ALUMINUM INDUSTRY Co.,Ltd.
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FOSHAN NANHAI DISTRICT DALI JILIDA ALUMINUM AUXILIARY MATERIAL FACTORY
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Abstract

The invention discloses a recycling method of industrial waste water. The recycling method is characterized in that alkali for neutralizing is used in aluminum anodizing waste water, precipitate of a sulfate system is generated, calcium ions in the waste water are fully reacted and sedimented by adding precipitator, the sediment is filtered and separated, calcium sulfate dissolved in waste water raw water is removed, and waste water recycling is conducted through a reverse osmosis system in the follow-up procedures. By means of the recycling method, the problem that a whole water production system fails due to the fact that a reverse osmosis film is blocked by a large amount of calcium sulfate is solved, a whole treatment process is continuous and reliable, management is simple, and operation is convenient.

Description

A kind of reuse method of trade effluent
Technical field
The present invention relates to waste water treatment and reclamation and utilize technical field, relate to more specifically a kind of take sulfate system as main aluminum anode oxidized waste water treatment process.
Background technology
Aluminium shape surface per ton is processed in the aluminium section bar production process needs water 10~30m 3, therefrom produce a large amount of waste water.At present, treatment process generally is with alkali the acid in the waste water to be neutralized, and adds the rear pressure of flocculation agent formation precipitation slag, then with the clear water discharging, seldom puts into production use to reclaiming again after the wastewater treatment; Generally use in addition carbide slag (main effective constituent is calcium carbonate, calcium hydroxide and calcium oxide etc.) as neutralization alkali in the actual production, some existing recovery schemes use reverse osmosis membrane that waste water is reclaimed use, but lack the special processing to calcium sulfate in the waste water in the scheme, relatively a large amount of existence of calcium sulfate brings great burden to reverse osmosis membrane, in the situation that calcium sulfate exists existing scheme infeasible.Number be CN201120360002.3 such as Chinese patent application, denomination of invention is the advanced treatment system of alumilite process waste water, comprise: nanofiltration device, reverse osmosis unit and mixed bed device, described nanofiltration device is communicated with reverse osmosis unit by pipeline, described reverse osmosis unit is communicated with the mixed bed device by pipeline, and the connection between described nanofiltration device, reverse osmosis unit and the mixed bed device is by a plurality of valves and instrument control.By the way, the advanced treatment system of alumilite process waste water can reduce the cleaning frequency, and the reverse osmosis membrane life-span prolongs relatively.And for example Chinese patent application number is CN200920039070.2, a kind of aluminum oxidation wastewater treatment and middle water recycling device is characterized in that: it comprises that wastewater disposal basin, PH adjust pond, electric coagulation machine, electric coagulation machine outlet sump, micro-filtration concentration basin, microfiltration systems, reuse pool, reverse osmosis system, pure water storage tank, concentrated solution collecting tank and pressure filter; Wastewater disposal basin, PH adjustment pond, electric coagulation machine, electric coagulation machine outlet sump, micro-filtration concentration basin, microfiltration systems, reuse pool, reverse osmosis system, pure water storage tank are connected in series successively; Outlet links to each other with the import of concentrated solution collecting tank respectively one outlet of micro-filtration concentration basin with the electric coagulation machine scum silica frost, and the outlet of concentrated solution collecting tank links to each other with pressure filter, and Filter Press liquid links to each other with the wastewater disposal basin import.This patent structure can effectively be removed the waste water COD≤25mg/L after heavy metal in the waste water and salt make processing, can not cause because dropping into coagulating agent, flocculation agent the secondary pollution of reuse water.But, simple multi-medium filtering processing power is very limited, can't be except the ion in anhydrating, reverse osmosis treatment system mainly is the selection perviousness that relies on reverse osmosis membrane, can be except the most ions in anhydrating, but a large amount of existence of calcium sulfate can cause the obstruction of reverse osmosis membrane, cause whole water manufacturing system to lose efficacy.
Summary of the invention
Purpose of the present invention is exactly that a kind of technique that provides for the deficiency that solves prior art is simple, and wastewater recycle rate is high, prolongs the scavenging period of reverse osmosis membrane, so that the reuse method of the trade effluent that reverse osmosis system is used.
The present invention adopts following technical solution to realize above-mentioned purpose: a kind of alumilite process reuse of wastewater method, it is characterized in that, it is to use first neutralization alkali in alumilite process waste water, generate the sulfate system throw out, then by adding precipitation agent, make the abundant reaction precipitation of calcium ion and filtering separation in the waste water, remove the calcium sulfate that dissolves in the former water of waste water, follow-uply carry out waste water recycling with reverse osmosis system.
As further specifying of such scheme, its concrete steps comprise:
A, add calcium carbonate, calcium hydroxide or calcium oxide in the alumilite process waste water and carry out neutralization reaction as neutralization with alkali;
B, add flocculation agent polyacrylamide solution and precipitation agent soluble carbonate salt successively, through the settling tank precipitate and separate;
C, enter reverse osmosis system and make reuse water.
In described processing step b, the precipitation agent soluble carbonate salt adopts yellow soda ash.
In described processing step b, water is to pass into tube settler through the water after the flocculation sediment processing first to precipitate, press slag to process; Then, pass into the negative pressure water-absorbing tank, by the raw water pump pumping, be transported in the reaction tank through line mixer; In reaction tank, add the precipitation agent soluble carbonate salt again, remove the calcium sulfate that dissolves in the waste water, generate the more lime deposit of indissoluble, then pass through the inclined-plate clarifying basin precipitation process, send into again and carry out the flocculation sediment processing in the secondary flocculation basin; At last, send into again reverse osmosis system after sending in the clean water basin dilution.
In described processing step c, pass through the water of the precipitation process of step b, be first successively by behind sand filtration, charcoal filter, the Bag filter, enter again reverse osmosis system.
The beneficial effect that the present invention adopts above-mentioned technical solution to reach is:
The present invention adopts mainly for the former water of waste water take sulfate system as main, and uses calcium carbonate, calcium hydroxide or calcium oxide as neutralization alkali, and generation sulfate system throw out is dissolved with the waste water of more vitriol after the processing; By adding precipitation agent yellow soda ash, make the abundant reaction precipitation of calcium ion and filtering separation in the waste water, remove a large amount of calcium sulfate that dissolve in the former water of waste water; Have benefited from the removal of calcium sulfate, follow-uply used as the main waste water recycling process that carries out take reverse osmosis system, obtain through test, wastewater recycle rate of the present invention can reach 80%.
Description of drawings
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is principle of operation figure of the present invention.
Embodiment
Below in conjunction with specific embodiment technical scheme of the present invention is described in further detail.
As shown in Figure 1, the reuse method of a kind of trade effluent of the present invention, it is to use first neutralization alkali in alumilite process waste water, generate the sulfate system throw out, then by adding precipitation agent, make the abundant reaction precipitation of calcium ion and filtering separation in the waste water, remove the calcium sulfate that dissolves in the former water of waste water, follow-uply carry out waste water recycling with reverse osmosis system.
As shown in Figure 2, its concrete steps comprise:
A, add calcium carbonate, calcium hydroxide or calcium oxide in the alumilite process waste water and carry out neutralization reaction as neutralization with alkali;
B, add flocculation agent polyacrylamide solution and precipitation agent soluble carbonate salt successively, through the settling tank precipitate and separate;
C, enter reverse osmosis system and make reuse water.
In described processing step b, the precipitation agent soluble carbonate salt adopts yellow soda ash.
In described processing step b, water is to pass into tube settler through the water after the flocculation sediment processing first to precipitate, press slag to process; Then, pass into the negative pressure water-absorbing tank, by the raw water pump pumping, be transported in the reaction tank through line mixer; In reaction tank, add the precipitation agent soluble carbonate salt again, remove the calcium sulfate that dissolves in the waste water, generate the more lime deposit of indissoluble, then pass through the inclined-plate clarifying basin precipitation process, send into again and carry out the flocculation sediment processing in the secondary flocculation basin; At last, send into again reverse osmosis system after sending in the clean water basin dilution.
In described processing step c, pass through the water of the precipitation process of step b, be first successively by behind sand filtration, charcoal filter, the Bag filter, enter again reverse osmosis system.
Existing reverse osmosis water manufacturing system can not directly apply to the defined waste water of the present invention, mainly be since wherein a large amount of calcium sulfate precipitations can stop up the reverse osmosis membrane pipe, concrete reason is that calcium sulfate solubleness is higher under the normal temperature and pressure, solubleness such as following table under the normal pressure of calcium sulfate and calcium carbonate:
? 0℃ 10℃ 20℃ 30℃ 40℃
CaSO 4·2H 2O/g 0.18 0.19 0.2 0.21 0.21
CaCO 3/mg 8.1 7.0 6.5 5.2 4.4
As can be seen from the above table, CaSO 42H 2O and CaCO 3Solubleness differs hundred times between the two, because the precipitation of calcium sulfate causes film blockage, reverse osmosis membrane to clean frequent, whole water manufacturing system and can't use, so need to before waste water advances reverse osmosis system most of calcium ion precipitation be removed with precipitation agent.
The present invention selects yellow soda ash as precipitation agent, and the chemical equation of itself and calcium sulfate is as follows:
CaSO 4+Na 2CO 3→CaCO 3↓+Na 2SO 4
Dissolubility data according to 20 ℃ of calcium sulfate and calcium carbonate can be calculated, to substantially remove the calcium sulfate that dissolves in the waste water in the time of 20 ℃, the theoretical usage quantity of yellow soda ash is 1.23g/L, in order to make its sufficient reacting and precipitation fully, must make yellow soda ash excessive, the actual amount of calcium carbonate should be more than theoretical consumption.
By the data of solubleness as can be known, fully concentrated 1m in theory 3Middle water can produce the above fouling of 2kg, and through the clear water behind the sedimentation and filtration, the amount that produces the precipitation fouling after concentrating is reduced to 6.5g, the advantage place of technical solution of the present invention that Here it is.
Above-described only is preferred implementation of the present invention, should be understood that, the present invention is mainly for the aluminum oxidation reuse of wastewater, the waste water that other sulphate contents are higher, use calcium carbonate, calcium hydroxide or calcium oxide as neutralization bases, and follow-up use reverse osmosis system water processed, should be change design direction of the present invention; The present invention is mainly for using in the carbide slag (main component is calcium carbonate, calcium hydroxide or calcium oxide) and the situation of sulfur acid waste water, use other calcium carbonate, calcium hydroxide or calcium oxide to use alkali as the material of main component as neutralizing, be used for and sulfur acid waste water, and follow-up use reverse osmosis system water processed, should be deformation program of the present invention; The present invention selects yellow soda ash as precipitation agent, uses other and the kin soluble carbonate salt of yellow soda ash as precipitation agent, should be deformation program of the present invention; The present invention selects the filter of sand filtration, carbon and bag type filtering, and the treatment process as removing before middle water behind the calcium sulfate enters reverse osmosis system as only using other filtrations and processing mode or not processing direct use reverse osmosis system water processed, should be deformation program of the present invention; For the person of ordinary skill of the art, under the prerequisite that does not break away from the invention design, can also make some distortion and improvement, these all belong to protection scope of the present invention.

Claims (5)

1. the reuse method of a trade effluent, it is characterized in that, it is to use first neutralization alkali in alumilite process waste water, generate the sulfate system throw out, then by adding precipitation agent, make the abundant reaction precipitation of calcium ion and filtering separation in the waste water, remove the calcium sulfate that dissolves in the former water of waste water, follow-uply carry out waste water recycling with reverse osmosis system.
2. the reuse method of a kind of trade effluent according to claim 1 is characterized in that, its concrete steps comprise:
A, add calcium carbonate, calcium hydroxide or calcium oxide in the alumilite process waste water and carry out neutralization reaction as neutralization with alkali;
B, add flocculation agent polyacrylamide solution and precipitation agent soluble carbonate salt successively, through the settling tank precipitate and separate;
C, enter reverse osmosis system and make reuse water.
3. the reuse method of a kind of trade effluent according to claim 2 is characterized in that, in described processing step b, the precipitation agent soluble carbonate salt adopts yellow soda ash.
4. the reuse method of a kind of trade effluent according to claim 2 is characterized in that, in described processing step b, water is to pass into tube settler through the water after the flocculation sediment processing first to precipitate, press slag to process; Then, pass into the negative pressure water-absorbing tank, by the raw water pump pumping, be transported in the reaction tank through line mixer; In reaction tank, add the precipitation agent soluble carbonate salt again, remove the calcium sulfate that dissolves in the waste water, generate the more lime deposit of indissoluble, then pass through the inclined-plate clarifying basin precipitation process, send into again and carry out the flocculation sediment processing in the secondary flocculation basin; At last, send into again reverse osmosis system after sending in the clean water basin dilution.
5. the reuse method of a kind of trade effluent according to claim 2 is characterized in that, in described processing step c, passes through the water of the precipitation process of step b, is first successively by behind sand filtration, charcoal filter, the Bag filter, enters reverse osmosis system again.
CN201310292430.0A 2013-07-11 2013-07-11 Recycling method of industrial waste water Active CN103304072B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621741A (en) * 2016-01-30 2016-06-01 内蒙古久科康瑞环保科技有限公司 Novel integral softening and treating device for industrial wastewater with high salt content
CN107758913A (en) * 2016-08-19 2018-03-06 宝山钢铁股份有限公司 A kind of method and apparatus for removing total organic carbon in cold rolling acid waste water
CN109607880A (en) * 2019-01-28 2019-04-12 杭州秀澈环保科技有限公司 Maintaining method suitable for containing sulfate radicals use in waste water treatment seperation film

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621741A (en) * 2016-01-30 2016-06-01 内蒙古久科康瑞环保科技有限公司 Novel integral softening and treating device for industrial wastewater with high salt content
CN107758913A (en) * 2016-08-19 2018-03-06 宝山钢铁股份有限公司 A kind of method and apparatus for removing total organic carbon in cold rolling acid waste water
CN109607880A (en) * 2019-01-28 2019-04-12 杭州秀澈环保科技有限公司 Maintaining method suitable for containing sulfate radicals use in waste water treatment seperation film

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Address after: 528231 Guangdong province Dali Nanhai District of Foshan City, Cao edge industrial zone three new Wai Road No. 19

Patentee after: Foshan City Kyrgyzstan Lida aluminum auxiliary material limited company

Address before: 528231 Guangdong Province, Foshan City Nanhai Dali Taiping stone Buyi

Patentee before: Foshan Nanhai District Dali Jilida Aluminum Auxiliary Material Factory

Address after: 528231 Guangdong city of Foshan province caobian Dali Town Nanhai District Industrial Zone Third prosperous road No. 2 two

Patentee after: Foshan City Kyrgyzstan Lida Aluminum Technology Co. Ltd.

Address before: 528231 Guangdong province Dali Nanhai District of Foshan City, Cao edge industrial zone three new Wai Road No. 19

Patentee before: Foshan City Kyrgyzstan Lida aluminum auxiliary material limited company

TR01 Transfer of patent right
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Effective date of registration: 20200618

Address after: 528200 Dali town industrial area, Nanhai District, Foshan, Guangdong

Patentee after: FOSHAN NANHAI DALI DATONG JINWEI ALUMINUM INDUSTRY Co.,Ltd.

Address before: 528231 Guangdong city of Foshan province caobian Dali Town Nanhai District Industrial Zone Third prosperous road No. 2 two

Patentee before: FOSHAN CITY JILIDA ALUMINUM TECHNOLOGY Co.,Ltd.