CN102701326A - Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater - Google Patents
Seawater desalinizing technology deeply treated by reverse osmosis membrane after mixing wastewater with seawater Download PDFInfo
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- CN102701326A CN102701326A CN2012101853731A CN201210185373A CN102701326A CN 102701326 A CN102701326 A CN 102701326A CN 2012101853731 A CN2012101853731 A CN 2012101853731A CN 201210185373 A CN201210185373 A CN 201210185373A CN 102701326 A CN102701326 A CN 102701326A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The invention relates to a seawater desalinizing technology deeply treated by a reverse osmosis membrane after mixing wastewater with seawater. The technology comprises the following steps of: mixing the wastewater which is discharged in accordance with standard with the seawater according to a certain proportion, and pretreating or mixing after the wastewater and the seawater are respectively pretreated, charging into a reverse osmosis membrane raw water box, flowing in a branching way through a booster pump and a cartridge filter, wherein one part of water enters into the reverse osmosis membrane through a high-pressure pump, and the other part of water enters into the reverse osmosis membrane through an energy recovering device which recovers the energy of high-pressure concentrated water and the booster pump, and filtering by the reverse osmosis membrane, so that the produced water enters into a reverse osmosis through production water box, to achieve the reuse standard, and can be taken as softened water or water for a boiler. The technology integrates the conventional reverse osmosis seawater desalinizing technology with the wastewater deep-treatment technology, so that the seawater temperature can be properly improved, the seawater salinity can be reduced, the recovery rate of produced water can be increased, the energy consumption of the high pressure pump can be reduced, the seawater desalinizing cost can be reduced, the wastewater resource can be recycled, and the difficulty of the shortage of water resources can be effectively remitted.
Description
Technical field:
The present invention relates to trade effluent, sewage r-o-(RO) embrane method advanced treatment process technology and reverse osmosis seawater desalting (SWRO) Technology; Particularly relate to the recycling and the energy-conservation Technology of SWRO of coastland trade effluent, promptly a kind of with the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing.
Background technology:
Along with the fast development of industry, Freshwater resources, energy shortage, environmental problem is serious day by day, influences development and national economy.At present, country is supporting sea water desaltination energetically, advocates energy-saving and emission-reduction, environment protection.
Ocean water accounts for 96.15% of water globe total reserves, and human nearly seventy percent place lived in apart from the sea less than 120 kilometers is arranged, the Freshwater resources critical shortage, so sea water desaltination becomes the inexorable trend of new water resources development.Desalination technology has the many decades developing history at present, and technology comparatively commonly used is mainly MSF and reverse osmosis membrane separation, and wherein MSF (MSF) and r-o-(RO) respectively account for about 45% of market.
The SWRO technology is simple because of its flow process, take up an area of less, construction costs and running cost continue to reduce, and developed rapidly, become the sea water desaltination Development Trend.R-o-(RO) is a kind of sepn process with pressure-actuated no phase transformation; Its principle is: two kinds of salt concentration is different with film water separate; Add a pressure in saliniferous one side; Make it osmotic pressure difference, force water from highly concentrated solution, to separate out and see through film and get into low salt concn solution, and the mineral ion tunicle stops generation fresh water greater than the film both sides.Reverse osmosis seawater desalination system is made up of four major portions: (1) pre-treatment; (2) HPP; (3) membrane module; (4) aftertreatment.Wherein, pre-treatment is very important, generally includes the removal suspended solids, regulates pH, adds critical masking agent with control lime carbonate and calcium sulfate scaling etc., and purpose all is for protective membrane.HPP is used for charging seawater pressurization, makes it to reach to be suitable for used film and the needed pressure of charging seawater.The core of membrane module is a semi-permeable membranes, and business-like reverse osmosis membrane is mainly rolled film and hollow-fibre membrane, and its material is mainly FM, polymeric amide and its verivate.Aftertreatment mainly is to carry out stabilizing treatment, comprises the pH regulator and the processing etc. that outgases.
At present, the universal main stranded cost problem of SWRO.Because the seawater saltiness is big, osmotic pressure is than higher, and reverse osmosis process needs bigger pressure, and generally sea water desaltination pressure 4-7MPa, so sea water desalinization process can consume mass energy, and main energy consumption is the supercharging energy consumption of HPP to water inlet.So the SWRO key is to reduce the working pressure of reverse osmosis membrane, improves the reverse osmosis system recovery, thereby reduces the operation of equipment expense, makes and produce the reduction of water cost.Existing SWRO technology mainly relies on energy recycle device and development of new low-pressure high-throughput reverse osmosis membrane, reduces process cost, and energy recovery rate surpasses 95% at present, has not had development space basically.Advocate energetically under the energy-saving and cost-reducing environment in country, how to continue to cut down the consumption of energy, saving the energy must draw attention.
Large amount of sewage is discharged in meeting in the Industrial processes, and these sewage all are directly to discharge or get into city planting ductwork after process factory's biochemistry or materialization processing reach emission standard at present.The annual process water of China surpasses 1,400 hundred million tons at present, about 24,000,000,000 tons of discharged volume of industrial waste water, and waste water up to standard discharges has in a large number wasted water resources, also environment is caused certain influence simultaneously.If can waste water advanced processing be recycled, just can effectively alleviate the difficult problem of shortage of water resources, realize the benefit win-win of economy, environment, society, advance the construction of resources conservation, friendly environment society.Advanced treatment method for sewage water mainly contains: biochemical treatment, embrane method are handled, materialization is handled.Biochemistry and materialization treatment project amount are big, and water quality does not often reach the reuse requirement, and are not easy to the recycle of waste water.It is best that the reverse osmosis membrane treatment technology produces water water quality; Even but the waste water of handling reaches qualified emission standard; Suspended substance, organism, colloid isoconcentration are still higher; This can make film forming severe contamination, reduction of service life, application and the popularization of restriction (RO) reverse osmosis membrane in waste water advanced processing.
Summary of the invention:
The objective of the invention is to overcome the shortcoming of prior art, provide a kind of the sea water desaltination novel process of utilizing the reverse osmosis membrane advanced treatment after waste water, the sea water mixing.This technology is utilized r-o-(RO) film advanced treatment after with the waste water of qualified discharge and sea water mixing; It is better to produce water water quality, and the recovery improves, and is easy to operate; Working cost is very low; And take up an area of less, cost of investment is low, can solve the problem that big and the waste water advanced cycle of treatment of SWRO energy consumption is utilized simultaneously, the realization energy-saving and emission-reduction.
In order to realize the foregoing invention purpose; A kind of with the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing; Waste water with qualified discharge mixes with seawater by a certain percentage earlier, mixes pre-treatment then, perhaps carries out respectively getting into RO membrane reverse osmosis system again after pre-treatment mixes; Produce water and reach reuse standard, can do softening water or BW.Its technical process is following:
Technical process 1, seawater separate with Wastewater Pretreatment: seawater is successively through (comprising seawater one-level, secondary pretreatment unit) after seawater water intaking pump, the pre-treatment of sea water preprocessing equipment and through getting into the r-o-raw water box behind waste water transferpump, the pretreated waste water proportional mixing up to standard of Wastewater Pretreatment equipment; Through shunting behind topping-up pump, the security personnel's strainer; A part gets into reverse osmosis desalination device (reverse osmosis membrane) through HPP; Another part is through reclaiming the energy recycle device of high-pressure thick water energy; Get into reverse osmosis membrane through the boost in pressure pump,, produce water and get into reverse osmosis produced water tank through the filtration of reverse osmosis membrane; Condensed water is handled the back discharging, and this technology is applicable to the situation that waste water quality is relatively poor.
Pre-treatment again after technical process 2, seawater and waste water mix earlier: seawater is through seawater water intaking pump, and behind the waste water process waste water transferpump, seawater, waste water get into mixing tank in proportion to be mixed; Get into then and mix the pre-processing device pre-treatment; Get into the r-o-raw water box through pretreated seawater, waste water mixing water, through shunting behind topping-up pump, the security personnel's strainer, a part gets into reverse osmosis desalination device (reverse osmosis membrane) through HPP; Another part is through reclaiming the energy recycle device of high-pressure thick water energy; Get into reverse osmosis membrane through the boost in pressure pump,, produce water and get into reverse osmosis produced water tank through the filtration of reverse osmosis membrane; Condensed water is handled the back discharging, and this technology is suitable for the better or situation approaching with the seawater quality condition of waste water quality.
Waste water according to the invention and sea water mixing ratio are: 1: 1,1: 2 or 1: 3.
Sea water preprocessing of the present invention adopts reverse osmosis seawater desalting feedwater preconditioning technique; Comprise new pretreatment technology such as traditional water treatment process such as sterilization, cohesion/flocculation, clarification, multi-medium filtering and embrane method, the embrane method pre-treatment mainly comprises micro-filtration (MF), ultrafiltration (UF) and nanofiltration (NF) etc.Pretreated purpose: remove suspended solids, reduce turbidity; The growth of controlling microbial; Suppress deposition with control slightly soluble salt; The adjustment of inflow temperature and pH; Organic removal; MOX and the control of silicon-containing compound deposition.
Energy recycle device of the present invention, the energy recycle device of employing Work-exchange type, energy recovery rate>90%.
Technology of the present invention also comprises the reverse-osmosis treated module, and reverse osmosis membrane assembly is in series by several membrane elements.
The used simulation software of the present invention is Tao Shi reverse osmosis design software ROSA 8.0, Hydranautics r-o-, nanofiltration design software IMSDesign2011.When system design, need provide data such as each ionic concn, feedwater type, feed temperature, pH value, SDI value, according to these data computation saltiness, osmotic pressure, LSI index, S&DSI index etc.Hop count, arrangement, the membrane element number of packages of each pressurized vessel, flooding velocity, the recovery, product discharge, back pressure, feed pressure through the input reverse osmosis process calculate parameters, energy consumption, expense etc.
Technology of the present invention compared with prior art has following advantage: integrated traditional reverse osmosis seawater desalting of the present invention (SWRO) and waste water advanced treatment process, can be applicable to all kinds of waste water, and comprise municipal wastewater, all types of industries waste water, light polluted water; The adding of waste water has suitably improved seawater temperature, has reduced sea water salinity and has reduced the concentration of each pollutant in the waste water simultaneously, has increased the product water recovery, reduces HPP energy consumption, the operation that greatly reduces sea water desaltination and cost of investment; Effluent quality is good, makes the waste water reclaiming recycle, effectively alleviates the difficult problem of shortage of water resources, realizes the benefit win-win of economy, environment, society.
Description of drawings:
Fig. 1 is technical process 1 synoptic diagram of the present invention.
Fig. 2 is technical process 2 synoptic diagram of the present invention.
Embodiment:
Below in conjunction with accompanying drawing and specific embodiment further elaboration is done in invention.
Embodiment 1,
Waste water sea water mixing ratio is: 1: 1,1: 2 or 1: 3.As shown in Figure 1; Seawater separates with Wastewater Pretreatment: through seawater water intaking pump, sea water preprocessing equipment (comprising seawater one-level, secondary pretreatment unit), waste water passes through waste water transferpump, Wastewater Pretreatment equipment to seawater successively successively, will pass through pretreated seawater and mix entering r-o-raw water box in back through pretreated waste water up to standard; Through shunting behind topping-up pump, the security personnel's strainer; A part gets into reverse osmosis desalination device (reverse osmosis membrane) through HPP, and reverse osmosis membrane assembly is in series by several membrane elements, and another part is through reclaiming the energy recycle device of high-pressure thick water energy; Get into reverse osmosis membrane through the boost in pressure pump; Through the filtration of reverse osmosis membrane, after product water gets into reverse osmosis produced water tank, deliver to each and use water spot; Discharge after the low-press thick water treatment of coming out from energy recycle device, this technology is applicable to the situation that waste water quality is relatively poor.
Embodiment 2,
Waste water sea water mixing ratio is: 1: 1,1: 2 or 1: 3.As shown in Figure 2, pre-treatment again after seawater mixes with waste water is first: seawater is through seawater water intaking pump, behind the waste water process waste water transferpump; Seawater, waste water get into mixing tank to be mixed, and gets into then and mixes pre-processing device, gets into the r-o-raw water box through pretreated seawater, waste water mixing water; Through shunting behind topping-up pump, the security personnel's strainer; A part gets into reverse osmosis desalination device (reverse osmosis membrane) through HPP, and reverse osmosis membrane assembly is in series by several membrane elements, and another part is through reclaiming the energy recycle device of high-pressure thick water energy; Get into reverse osmosis membrane through the boost in pressure pump; Through the filtration of reverse osmosis membrane, after product water gets into reverse osmosis produced water tank, deliver to each and use water spot; Discharge after the low-press thick water treatment of coming out from energy recycle device, this technology is suitable for waste water quality better or the situation approaching with the seawater quality condition.
Embodiment 3, calculating and analysis
Carried out software simulation according to Fig. 1 or technology shown in Figure 2, simulation ton sea water desaltination project, total system is divided into two covers, and every cover is produced five kiloton fresh water, i.e. water production rate 208m daily
3/ h, service temperature is 15 ℃, installs stable.Wherein, Reverse osmosis seawater desalting (SWRO) feedwater preconditioning technique comprises new water technologies such as traditional water treatment process such as sterilization, cohesion/flocculation, clarification, multi-medium filtering and embrane method, and the embrane method preconditioning technique mainly comprises micro-filtration (MF), ultrafiltration (UF) and nanofiltration (NF) etc.Consumption is calculated and is analyzed to new and old desalination process major impetus.
1, with Tao Shi r-o-software for calculation ROSA8.0 model analysis
Can find out that by table 1 novel process is than old technology:
Ton water power consumption is low, waste water seawater ratio be 1: 3 o'clock only the high voltage power energy consumption just can save approximately 30%, waste water seawater ratio is that energy consumption saving in 1: 1 o'clock is up to 56%; The recovery is high, and flooding velocity is little, and pre-treatment energy consumption, expense reduce; Influent concentration, intake pressure are low, use membrane element few, and cost of equipment is low.
Table new and old processing simulation of 1ROSA software and energy consumption analysis
2, with Hydranautics r-o-software for calculation IMSDesign2011 model analysis
Can find out that by table 2 novel process is than old technology:
Ton water power consumption is low, waste water seawater ratio be 1: 3 o'clock only the high voltage power energy consumption just can save approximately 17%, waste water seawater ratio is that 1: 2 and 1: 1 o'clock energy consumption reduce by 19%, 23% respectively; The recovery is high, and flooding velocity is little, and pre-treatment energy consumption, expense reduce; Influent concentration, intake pressure are low, and costs of equipment such as HPP, pipeline, valve are low.
Table new and old processing simulation of 2IMSDesign2010 software and energy consumption analysis
Through analyzing, technology of the present invention has reached energy efficient, has reduced the purpose of cost of equipment, cycling utilization of wastewater, and the waste of water resources has been avoided in energy-saving and emission-reduction, is of value to environment protection.
Claims (4)
1. one kind with the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing; It is characterized in that: technical process 1: seawater gets into the r-o-raw water box behind the waste water proportional mixing up to standard through seawater water intaking pump, sea water preprocessing equipment and process waste water transferpump, Wastewater Pretreatment equipment successively; Through shunting behind topping-up pump, the security personnel's strainer, a part gets into reverse osmosis membrane through HPP, and another part is through reclaiming the energy recycle device of high-pressure thick water energy; Get into reverse osmosis membrane through the boost in pressure pump; Through the filtration of reverse osmosis membrane, to produce water and get into reverse osmosis produced water tank, condensed water is handled the back discharging; Technical process 2: seawater is through seawater water intaking pump, and behind the waste water process waste water transferpump, seawater, waste water get into mixing tank in proportion to be mixed; Get into then and mix pre-processing device, get into the r-o-raw water box, through shunting behind topping-up pump, the security personnel's strainer through pretreated seawater, waste water mixing water; A part gets into reverse osmosis membrane through HPP; Another part gets into reverse osmosis membrane through reclaiming the energy recycle device of high-pressure thick water energy through the boost in pressure pump, through the filtration of reverse osmosis membrane; Produce water and get into reverse osmosis produced water tank, condensed water is handled the back discharging; Wherein, waste water and sea water mixing ratio are 1: 1,1: 2 or 1: 3 in two kinds of technology.
2. according to claim 1 a kind of with the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing; It is characterized in that sea water preprocessing adopts reverse osmosis seawater desalting feedwater preconditioning technique; Comprise sterilization, cohesion/flocculation, clarification, multi-medium filtering and embrane method pretreatment technology, the embrane method pre-treatment comprises micro-filtration, ultrafiltration and nanofiltration.
3. according to claim 1ly a kind of the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing is characterized in that described energy recycle device, adopt the energy recycle device of Work-exchange type, energy recovery rate 90%.
4. according to claim 1 a kind of with the desalination process that utilizes the reverse osmosis membrane advanced treatment after waste water, the sea water mixing, it is characterized in that reverse osmosis membrane assembly is in series by several membrane elements.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10125039B2 (en) | 2016-10-24 | 2018-11-13 | Kuwait University | Method of recycling brine from a multi-stage flash desalination plant |
| CN108996561A (en) * | 2018-06-29 | 2018-12-14 | 首钢京唐钢铁联合有限责任公司 | A kind of recycled water preparation system and method |
| CN110036181A (en) * | 2016-11-30 | 2019-07-19 | 沙特阿拉伯石油公司 | The water disposal plan of recovery process is replaced for the injection water drive in Carbonate Reservoir |
| CN110937728A (en) * | 2018-09-25 | 2020-03-31 | 国家能源投资集团有限责任公司 | Desulfurization wastewater treatment method and system |
| CN111709132A (en) * | 2020-06-10 | 2020-09-25 | 杭州电子科技大学 | Full-flow reverse osmosis seawater desalination device and optimization method thereof |
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| CN2711038Y (en) * | 2004-05-28 | 2005-07-20 | 天津市海跃水处理高科技有限公司 | Sea water desalination ship |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10125039B2 (en) | 2016-10-24 | 2018-11-13 | Kuwait University | Method of recycling brine from a multi-stage flash desalination plant |
| CN110036181A (en) * | 2016-11-30 | 2019-07-19 | 沙特阿拉伯石油公司 | The water disposal plan of recovery process is replaced for the injection water drive in Carbonate Reservoir |
| CN108996561A (en) * | 2018-06-29 | 2018-12-14 | 首钢京唐钢铁联合有限责任公司 | A kind of recycled water preparation system and method |
| CN110937728A (en) * | 2018-09-25 | 2020-03-31 | 国家能源投资集团有限责任公司 | Desulfurization wastewater treatment method and system |
| CN111709132A (en) * | 2020-06-10 | 2020-09-25 | 杭州电子科技大学 | Full-flow reverse osmosis seawater desalination device and optimization method thereof |
| CN111709132B (en) * | 2020-06-10 | 2023-05-05 | 杭州电子科技大学 | Full-flow reverse osmosis seawater desalination device and optimization method thereof |
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Application publication date: 20121003 |