CN104556475A - Pretreatment technology of high-salinity wastewater - Google Patents
Pretreatment technology of high-salinity wastewater Download PDFInfo
- Publication number
- CN104556475A CN104556475A CN201410803671.1A CN201410803671A CN104556475A CN 104556475 A CN104556475 A CN 104556475A CN 201410803671 A CN201410803671 A CN 201410803671A CN 104556475 A CN104556475 A CN 104556475A
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- Prior art keywords
- sewage
- water
- hardness
- feeding
- pond
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Classifications
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/02—Softening water by precipitation of the hardness
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- 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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses a pretreatment technology of high-salinity wastewater. The technology comprises the following steps: feeding sewage into a chemical reaction pond, feeding sodium carbonate and soda lime to water according to the sewage quality characteristics, and rapidly reacting with raw material, crystallizing and separating out kinds of scale forming matters in water, and removing the hardness in water; feeding the sewage to a coagulation dosing pool, feeding a magnesia mixture to the sewage which is subjected to hardness treatment in the step 1, reacting with SiO2 and the magnesia mixture in the sewage, participating and separating out; destabilizing colloid under the action of a coagulant and forming a precipitable flocculent body; feeding the sewage to a flocculent precipitation-concentration pond system, separating alumen ustum from water, accelerating concentration of the sludge participating at the bottom of the pond by virtue of a concentration stirrer with a mud scraper system; and continuously circulating partial sludge into a flocculation basin, simultaneously extracting the residual sludge at regular periods, and feeding to a sludge treatment system. The technology disclosed by the invention has the advantages of full chemical reaction, low residual hardness, good flocculent precipitation effect and impact load resistance and the like; and agents are saved.
Description
Technical field
The present invention relates to pretreatment technology in a kind of sewage treatment process.
Background technology
Due to growth and the socioeconomic development of population, the increase gradually of mankind's water consumption, original water resources is polluted, and this series of reason causes the in short supply of water resources and become the restraining factors of China's sustainable economic development.In order to solve the problem of shortage of water resources and water resource pollution, brackish water, seawater and urban sewage recycling have become the key of dealing with problems.
Haline water refers to that total salinity (with NaCl content meter) is at least the waste water of 1%, mainly comprises saliferous trade effluent, saliferous sanitary sewage and other brine wastes.Brine waste can be divided into according to brine waste source: the waste water discharged in direct seawater utilization process, trade effluent, other brine wastes.If the unprocessed direct discharge of these high-salt wastewaters, harm greatly will certainly be produced to aqueous bio, Drinking Water and workers and peasants' water of productive use.But brine concentration can not be too high in conventional treatment method, the urgently high-salt wastewater Technology of development process greater concn.
Reverse osmosis technology is widely applied in the process of high-salt wastewater at present.Reverse osmosis technology is applied in China in 20 worlds sixties, first for the preparation of electronic industry ultrapure water and beverage industries water, then for power plant water process.Reverse osmosis membrane take pressure as impellent, utilize reverse osmosis membrane can only can not through the selective penetrated property of solute through water, from the water body containing various inorganics, organism and microorganism, extract the separating substances process of pure water, organism and the mineral ion of 0.3 ~ 1.2nm size can be removed.Reverse osmosis reaches 93% and 76% ~ 87% respectively to the clearance of TOC and AOC.
As an advanced water technology, reverse osmosis process is widely applied to all trades and professions, but in operational process, found to also have some problems not solve in reverse osmosis, wherein pre-treatment is exactly wherein very important one.
Pre-treatment is as a part requisite in reverse osmosis process, and object is to improve water supply conditions, makes it reach the inflow requirement of reverse osmosis system, thus protection reverse osmosis main frame, and extend the work-ing life of film.In water treatment system, usually need to carry out pretreatment design for different quality, the modal pretreatment system being more medium filter+gac+Scale inhibitors chemicals dosing plant+accurate filter and forming.And the in-line coagulation of this routine can not remove hardness in water and silicate.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides and can remove hardness and SiO in water
2high-salt wastewater pretreatment technology.
Object of the present invention carrys out specific implementation by the following technical programs:
A kind of high-salt wastewater pretreatment technology, first except the CO of decontaminated water
3 2-and hardness, then dosing is except SiO
2, last flocculation sediment.
Concrete operation step is:
1) first make sewage enter chemical reaction pond, Xiang Shuizhong adds soda ash and soda-lime except the hardness in anhydrating;
2) then enter coagulation dosing pond, add magnesia mixture, the silicate in sewage and magnesia mixture react and Precipitation, form precipitable flco;
3) enter flocculation sediment-concentration basin system after, be separated by alumen ustum with water, the mud be deposited on bottom pond accelerates concentrated by the concentrated agitator being furnished with mud scraper system, and partial sludge is continuously circulated to flocculation basin.
Preferably, in described step 1), the amount adding soda ash is Ca in sewage
2+1.5 times of molar weight, the amount adding soda-lime is CO in sewage
3 2-1.5 times of molar weight.
Preferably, in described step 1), during dosing, adopt high speed agitator to stir, make medicament and former water rapid reaction.
Preferably, described step 2) in, the amount adding magnesia mixture is SiO
22 times of molar weight.
Preferably, described step 2) in, during dosing, adopt high speed agitator to stir, make medicament and former water rapid reaction.
Step 2) in, magnesia mixture and former water rapid reaction, make various fouling tendency substance crystallization in water separate out.Can also add coagulating agent, under the common synergy of coagulating agent, elimination of colloid stability, makes precipitation form flco, thus accelerates precipitation, is conducive to being separated simultaneously.
Preferably, in described step 3), regularly excess sludge is extracted out, deliver to sludge treating system.More excellent, in described step 3), mud discharging is intermittent.
Mud no longer needs to carry out concentration in subsequent processes.
In order to essence of the present invention is described, applicant provides as follows experiment:
1, raw water quality analysis
Through the pH value to former water water sample, hardness, TDS, SiO
2and the analysis of COD measures, raw water quality is as shown in table 1.1.
Table 1.1 raw water quality
Through the analysis to former water water sample, by calculating theoretical CaO, MgO, NaCO
3dosage be respectively 56mg/L, 282mg/L, 1332mg/L.
2, the CaO of different mass tests the carbonate impact analysis of water sample
Through analysis to former water water sample, learn that the concentration of carbonate and bicarbonate radical in former water water sample is 61.02mg/L, through calculating, can to obtain the concentration that theory adds CaO be 56mg/L.Getting 500ml former water water sample, to add CaO in shortage, theoretical amount and enough time test, reconcile pH=10 before adding CaO and carry out control experiment.Be placed in six agitators and stir, stirring velocity is 200r/min, and churning time is 30min, by water sample clarification filtration after having stirred, measures the CO of water sample afterwards
3 2-and HCO
3 -the change of concentration.Through detecting, find that the amount adding CaO is CO in sewage
3 2-and HCO
3 -during 1.5 times of mole total amount, the concentration of carbonate and bicarbonate radical is down to 0mg/L.
3, the MgO of different mass is to the SiO of water sample
2
impact analysis experiment
Through the analysis to former water water sample, learn SiO in former water
2concentration be 423.64mg/L, be 282mg/L through calculating the concentration that can obtain theoretical MgO.Getting 500ml former water water sample, to add MgO in shortage, theoretical amount and enough time test, reconcile pH=10.Be placed in six agitators and stir, stirring velocity is 200r/min, and churning time is 30min, by water sample clarification filtration after having stirred, measures the SiO of water sample afterwards
2the change of content.Through detecting, find that the amount adding MgO is SiO in sewage
2siO during 2 times of mole total amount
2concentration be down to 79.14mg/L, degradation rate reaches 76.7%.Obtain the addition of MgO thus at SiO
2about 2 times of molar weight, the effect of process is best.
4, the NaCO of different mass
3
the impact analysis of hardness in water sample is tested
Cross the analysis to former water water sample, learn that in former water, hardness is (with Ca CO
3) concentration be 1257.38mg/L, through calculating can obtain theoretical NaCO
3concentration be 1043.62mg/L.Get the former water water sample of 500ml and add NaCO
3in shortage, theoretical amount and enough time test, reconcile pH=10.Be placed in six agitators and stir, stirring velocity is 200r/min, and churning time is 30min, by water sample clarification filtration after having stirred, measures the change of the hardness content of water sample afterwards.Through detecting, find to add NaCO
3amount when being 1.5 times of hardness mole total amount in sewage hardness be down to 60.6mg/L, degradation rate reaches 80%.The addition obtaining sodium carbonate is thus at about 1.5 times of molar weight of hardness, and the effect of process is best.
5, different order of addition of ingredients is to pH, hardness, TDS, SiO in water sample
2
impact analysis experiment
Consider that different order of addition of ingredients can to the pH in former water, hardness, TDS, SiO
2clearance have different effects, so this experiment adopts following five kinds of schemes:
1) in 500ml water, applicable CaO, MgO, NaCO is added successively
3;
2) in 500ml water, applicable CaO, NaCO is added successively
3, MgO;
3) in 500ml water, add applicable CaO, NaCO simultaneously
3, then add MgO;
4) in 500ml water, add applicable CaO, MgO simultaneously, then add NaCO
3;
5) in 500ml water, add applicable CaO, MgO, NaCO simultaneously
3.
Get the former water water sample of 500ml, add CaO 84mg, MgO560mg, NaCO
31513mg, adds respectively according to such scheme, and then stir in instrument six and stir, rotating speed is 200r/min, and churning time is 30min, is filtered by water sample after having stirred, and measures the pH of water sample, hardness, TDS, SiO
2impact.Consider through experimental result, namely the third scheme above-mentioned first adds CaO and NaCO simultaneously
3, then the treatment effect of dosing method to high strong brine adding MgO is best, clearance reaches SiO
2clearance reaches 76.7%, and it is 83% that hardness clearance reaches 80%, TDS clearance.Reach silica removal, softening object.
Beneficial effect of the present invention:
1) the present invention has the advantages such as chemical reaction is abundant, residual harness is low, saving medicament, flocculating effect are good, anti impulsion load.The present invention is at the high strong brine (SiO of process
2for 422mg/L, hardness is 1257mg/L, TDS is 2699mg/L) through adding white lime, soda ash 1.5 times for the treatment of capacity, magnesium oxide is under the condition of 2 times of silicon-dioxide, and under above-mentioned treatment process, effluent quality is SiO
2clearance reaches 76.7%, and it is 83% that hardness clearance reaches 80%, TDS clearance.Reach silica removal, softening object.
2) the present invention has effects such as reducing influent turbidity, fluorine, organism, hardness.
3) to have floor space little in the present invention.The advantages such as device is compact, efficient, flexible.Be mainly reflected in, when processing high strong brine, as needed other devices to need floor space larger to the pre-treatment carrying out high strong brine, and two devices are synthesized the floor space that a pond which offers a saving a pond by the present invention.Also seeming, device is compact, but can't affect the pretreating effect to high strong brine like this, also can improve the pretreating effect to high strong brine on the contrary.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
embodiment 1:
A kind of high-salt wastewater pretreatment technology, first except the hardness of decontaminated water, then dosing is except SiO
2, last flocculation sediment.
Concrete operation step is:
1) first make sewage enter chemical reaction pond, Xiang Shuizhong adds soda ash and soda-lime, adopts high speed agitator to stir, makes medicament and former water rapid reaction, except the hardness in anhydrating;
2) then enter coagulation dosing pond, add magnesia mixture, coagulating agent, adopt high speed agitator to stir, the SiO in sewage
2react and Precipitation with magnesia mixture, form precipitable flco;
3) enter flocculation sediment-concentration basin system after, be separated by alumen ustum with water, the mud be deposited on bottom pond accelerates concentrated by the concentrated agitator being furnished with mud scraper system, and partial sludge is continuously circulated to flocculation basin.Intermittent regularly by excess sludge extraction, deliver to sludge treating system, mud no longer needs to carry out concentration in subsequent processes.
Wherein: the amount adding soda ash is Ca in sewage
2+1.5 times of molar weight, the amount adding soda-lime is CO in sewage
3 2-1.5 times of molar weight, the amount adding magnesia mixture is SiO
22 times of molar weight.
The present invention is to total hardness and SiO in removal water
2there is good removal effect.Compared with traditional technology, this technique has the advantages such as chemical reaction is abundant, residual harness is low, saving medicament, flocculation sediment are effective, anti impulsion load.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a high-salt wastewater pretreatment technology, is characterized in that: first except the hardness of decontaminated water, and then dosing is except SiO
2, last flocculation sediment.
2. high-salt wastewater pretreatment technology according to claim 1, is characterized in that: concrete operation step is:
1) first make sewage enter chemical reaction pond, Xiang Shuizhong adds soda ash and soda-lime except the hardness in anhydrating and CO
3 2-;
2) then enter coagulation dosing pond, add magnesia mixture, the SiO in sewage
2react and Precipitation with magnesia mixture, form precipitable flco;
3) enter flocculation sediment-concentration basin system after, be separated by alumen ustum with water, the mud be deposited on bottom pond accelerates concentrated by the concentrated agitator being furnished with mud scraper system, and partial sludge is continuously circulated to flocculation basin.
3. high-salt wastewater pretreatment technology according to claim 2, is characterized in that: in described step 1), and the amount adding soda ash is Ca in sewage
2+1.5 times of molar weight, the amount adding soda-lime is CO in sewage
3 2-1.5 times of molar weight.
4. high-salt wastewater pretreatment technology according to claim 2, is characterized in that: described step 2) in, the amount adding magnesia mixture is SiO
22 times of molar weight.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410803671.1A CN104556475A (en) | 2014-12-23 | 2014-12-23 | Pretreatment technology of high-salinity wastewater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410803671.1A CN104556475A (en) | 2014-12-23 | 2014-12-23 | Pretreatment technology of high-salinity wastewater |
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| CN201410803671.1A Pending CN104556475A (en) | 2014-12-23 | 2014-12-23 | Pretreatment technology of high-salinity wastewater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107352681A (en) * | 2017-07-25 | 2017-11-17 | 中国石油化工股份有限公司 | A kind of silicon removing method of high ammonium high salt high silicon catalyst waste water |
| CN109574307A (en) * | 2018-12-16 | 2019-04-05 | 金科环境股份有限公司 | Remove the device of whole hardness in reverse osmosis concentrated water |
| CN110382074A (en) * | 2017-02-24 | 2019-10-25 | 奥加诺株式会社 | Flocculation and depositing device |
| CN113830952A (en) * | 2021-10-12 | 2021-12-24 | 远安县燎原矿业有限责任公司 | Phosphorite mine water treatment system and treatment method |
| CN116444106A (en) * | 2023-06-14 | 2023-07-18 | 华电电力科学研究院有限公司 | High-hardness high-sulfate type coal mine water treatment method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102476877A (en) * | 2010-11-29 | 2012-05-30 | 中国科学院大连化学物理研究所 | Silicon-removing and oil-removing composite method of oil-containing sewage for boiler reuse |
| CN203833713U (en) * | 2014-01-21 | 2014-09-17 | 新奥科技发展有限公司 | Water treatment device |
-
2014
- 2014-12-23 CN CN201410803671.1A patent/CN104556475A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476877A (en) * | 2010-11-29 | 2012-05-30 | 中国科学院大连化学物理研究所 | Silicon-removing and oil-removing composite method of oil-containing sewage for boiler reuse |
| CN203833713U (en) * | 2014-01-21 | 2014-09-17 | 新奥科技发展有限公司 | Water treatment device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110382074A (en) * | 2017-02-24 | 2019-10-25 | 奥加诺株式会社 | Flocculation and depositing device |
| CN110382074B (en) * | 2017-02-24 | 2021-08-24 | 奥加诺株式会社 | Flocculation and sedimentation device |
| CN107352681A (en) * | 2017-07-25 | 2017-11-17 | 中国石油化工股份有限公司 | A kind of silicon removing method of high ammonium high salt high silicon catalyst waste water |
| CN109574307A (en) * | 2018-12-16 | 2019-04-05 | 金科环境股份有限公司 | Remove the device of whole hardness in reverse osmosis concentrated water |
| CN113830952A (en) * | 2021-10-12 | 2021-12-24 | 远安县燎原矿业有限责任公司 | Phosphorite mine water treatment system and treatment method |
| CN116444106A (en) * | 2023-06-14 | 2023-07-18 | 华电电力科学研究院有限公司 | High-hardness high-sulfate type coal mine water treatment method and device |
| CN116444106B (en) * | 2023-06-14 | 2023-09-12 | 华电电力科学研究院有限公司 | High-hardness high-sulfate type coal mine water treatment method and device |
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