CN104445774A - Wastewater treating device and method - Google Patents
Wastewater treating device and method Download PDFInfo
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- CN104445774A CN104445774A CN201410680191.0A CN201410680191A CN104445774A CN 104445774 A CN104445774 A CN 104445774A CN 201410680191 A CN201410680191 A CN 201410680191A CN 104445774 A CN104445774 A CN 104445774A
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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
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
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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
- 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
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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
- 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
- C02F2001/5218—Crystallization
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Abstract
The invention discloses a wastewater treating device. The wastewater treating device comprises an adjusting pool, a pipeline mixer, a primary filtering system, a secondary filtering system, a primary reverse osmosing system, a secondary reverse osmosing system and an evaporating and crystallizing system. The invention further discloses a wastewater treating method. By the cooperation treatment of the primary filtering system, the secondary filtering system, the primary reverse osmosing system and the secondary reverse osmosing system, a penetrating fluid accounting for about 88% of the volume of wastewater can be recycled to be used as recycled water, and evaporation and crystallization can be further conducted on the rest few penetrating fluid, so that zero emission treatment of wastewater, particularly wastewater high in salt content, can be realized.
Description
Technical field
The invention belongs to field of industrial waste water treatment, be specifically related to a kind of wastewater treatment equipment and the method that can carry out zero discharge treatment to waste water.
Background technology
In recent years, along with the fast development of China's oil chemical industry, coal chemical industry, the construction scale of industrial circulating cooling water system, chemical water system, boiler systems is all increasing, have problems is a large amount of discharge of wastewater thereupon, this part wastewater discharge accounts for 10% ~ 20% of enterprise water use total amount, and all contains higher salt.Therefore, if this part direct discharging of waste water will be wasted a large amount of water resourcess.In addition, the discharge of high-salt wastewater not only can destroy the self-purification capacity of local natural water, also can make a very bad impression to water ecological environment, and saline Land problem may be caused to increase the weight of.
The proposition of the Green GDP construction that increasingly serious along with China's water scarcity situation, especially country advocate energetically and recycling economy, makes industrial water saving reduce discharging with utilization of wastewater resource particularly important.Therefore how economical, efficient, improve enterprise's water resources comprehensive utilization rate reliably and even reach " zero release " standard, be that enterprise meets country, local government's environmental requirement, establish enterprise and to take responsibility the important process of image.
Summary of the invention
The object of the present invention is to provide a kind of wastewater treatment equipment and method, to improve wastewater utilization rate, reduce discharge of wastewater.
According to an aspect of the present invention, the invention provides a kind of wastewater treatment equipment, described wastewater treatment equipment comprises:
Equalizing tank, for receiving pending waste water and making reception waste water mix;
Line mixer, to mix with additional flocculating agents for making the waste water from described equalizing tank and flocculates;
Single filter system, for filtering from the flocs unit in the waste water of described line mixer, suspended substance and solid phase impurity, described single filter system comprises mechanical filter and line strainer, described mechanical filter is used for filtering the waste water from described line mixer, and described line strainer is used for filtering the filtrate of described mechanical filter;
Cascade filtration system, described cascade filtration system comprises ultrafiltration apparatus and nanofiltration equipment, described ultrafiltration apparatus is used for carrying out uf processing to the waste water after the process of described single filter system, and described nanofiltration equipment is used for carrying out nanofiltration process to the waste water after described ultrafiltration apparatus process;
First-stage reverse osmosis system, for carrying out reverse-osmosis treated to the waste water after the process of described cascade filtration system;
Two-stage reverse osmosis system, for carrying out reverse-osmosis treated to the seepage remaining liquid of described first-stage reverse osmosis system;
Evaporation and crystallization system, for carrying out evaporative crystallization to the seepage remaining liquid of described two-stage reverse osmosis system.
According to wastewater treatment equipment of the present invention, preferably, described wastewater treatment equipment also comprises product water tank, and described product water tank is for receiving the penetrating fluid of described first-stage reverse osmosis system and two-stage reverse osmosis system.
According to wastewater treatment equipment of the present invention, preferably, described wastewater treatment equipment also comprises interchanger, and described interchanger is arranged between described single filter system and cascade filtration system, for regulating the temperature of the waste water after the process of described single filter system.
According to wastewater treatment equipment of the present invention, preferably, described first-stage reverse osmosis system comprises:
First topping-up pump, for carrying out supercharging from the waste water of described cascade filtration system;
First accurate filter, for filtering the waste water from described first topping-up pump;
First high-pressure pump, for promoting the pressure of the filtrate of described first cartridge filter;
First reverse osmosis equipment, for carrying out reverse-osmosis treated to the waste water from described first high-pressure pump;
First dense water tank, for receiving the seepage remaining liquid of described first-stage reverse osmosis equipment.
Described two-stage reverse osmosis system comprises:
Second topping-up pump, for carrying out supercharging from the waste water of described cascade filtration system;
Second accurate filter, for filtering the waste water from described second topping-up pump;
Second high-pressure pump, for promoting the pressure of the filtrate of described second cartridge filter;
Second reverse osmosis equipment, for carrying out reverse-osmosis treated to the waste water from described second high-pressure pump;
Second dense water tank, for receiving the seepage remaining liquid of described second-level reverse osmosis device.
According to wastewater treatment equipment of the present invention, preferably, the reverse osmosis membrane that described first reverse osmosis equipment adopts is antipollution complex reverse osmosis membrane; Described second reverse osmosis membrane equipment is disc tube reverse osmosis (dt-ro) film device, oscillatory shear reinforced film equipment or ductwork type reverse osmosis membrane equipment.
According to another aspect of the present invention, present invention also offers a kind of method utilizing above-mentioned wastewater treatment equipment process waste water, described method comprises the steps:
A, waste water introduced equalizing tank and carry out homogeneous and all measure adjustment, in the waste water after regulating, add flocculation agent and waste water is fully flocculated at line mixer;
B, the waste water utilizing described mechanical filter and line strainer treatment step a to obtain, to remove flocs unit, suspended substance and the solid phase impurity in waste water, make delivery turbidity≤5NTU;
C, utilize described ultrafiltration apparatus to carry out ultrafiltration to the waste water that step b obtains, make ultra-filtration water SDI≤3; Utilize described nanofiltration equipment to carry out nanofiltration to described ultra-filtration water, remove the hardness ions of in ultra-filtration water more than 80%;
D, reverse-osmosis treated is carried out to the waste water that step c obtains, and evaporative crystallization is carried out to the seepage remaining liquid obtained after reverse-osmosis treated; TDS≤the 600mg/L of reverse-osmosis treated gained penetrating fluid, is sent to circulating water system.
According to method of the present invention, preferably, the TDS of described waste water is not less than 1500mg/L, and turbidity is not less than 10NTU, and the COD value of described waste water is not less than 100mg/L; Further preferably, the TDS of described waste water is 2000mg/L ~ 6000mg/L, and turbidity is 10-25NTU, and the COD value of described waste water is 100-250g/L; Still more preferably, the TDS of described waste water is 3000mg/L ~ 5000mg/L, and turbidity is 15-20NTU, and the COD value of described waste water is 150-200g/L.According to method of the present invention, preferably, in step c, the waste water that described step b obtains adds sterilant before carrying out ultrafiltration, and described sterilant can be the sterilant that this area is commonly used.
According to method of the present invention, preferably, in step c, the waste water that described step b obtains utilizes interchanger that temperature is adjusted to 5 DEG C-30 DEG C before carrying out ultrafiltration, more preferably 20 DEG C-35 DEG C.
According to method of the present invention, preferably, in step c, the TDS≤300mg/L of the seepage remaining liquid of described first-stage reverse osmosis system, output is the 65%-75% of the wastewater flow of described first-stage reverse osmosis system process; TDS≤the 1000mg/L of the seepage remaining liquid of described two-stage reverse osmosis system, output is the 55%-65% of the wastewater flow of described two-stage reverse osmosis system process.
Compared with prior art, the present invention is by the cooperation process of single filter system, cascade filtration system and reverse osmosis system, the penetrating fluid accounting for wastewater volume 88% can be reclaimed reuse as recirculated water, remaining a small amount of seepage remaining liquid carries out evaporative crystallization process further, thus realize waste water, the particularly zero discharge treatment of the waste water that salts contg is higher, reduces the baneful influence of brine waste discharge to local water surrounding, alleviates increasingly serious water scarcity situation simultaneously.
In addition; the present invention preferably adopts two-pass RO system further; when processing waste water; two-pass RO system can be made to adopt the low rate of recovery; effectively prevent reverse osmosis membrane surface from occurring concentration polarization phenomenon too early; extend the life cycle of reverse osmosis membrane system, reduce reverse osmosis equipment stop cleaning frequency.
In addition, the present invention carried out ultrafiltration and nanofiltration before reverse osmosis, thus made waste water hardness before entering reverse osmosis system reduce more than 80%, greatly reduced concentration polarization phenomenon and the scale effect of the hardness ions on reverse osmosis membrane surface.Meanwhile, in whole system of the present invention, investment and the highest part of running cost are evaporation and crystallization system, and therefore employing firsts and seconds reverse osmosis system reduces the sewage load of evaporation and crystallization system, with investment reduction and running cost.Waste water handled by two-stage reverse osmosis system is the seepage remaining liquid of first-stage reverse osmosis system, for this reason, the present invention preferably applies the reverse osmosis equipment adopted in percolate system especially, and be successfully applied in the middle of brine waste process field, efficiently solve brine waste this technical barrier of minimizing process to greatest extent.Save investment and the running cost of subsequent evaporation crystal system to greatest extent.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of wastewater treatment equipment of the present invention.
Embodiment
The invention provides a kind of wastewater treatment equipment, in the present invention, described wastewater treatment equipment comprises equalizing tank, line mixer, single filter system, cascade filtration system, first-stage reverse osmosis system, two-stage reverse osmosis system and evaporation and crystallization system.
In the present invention, those for knowing described in this area of described equalizing tank, for receiving pending waste water and making reception waste water mix.
In the present invention, described line mixer is for making the waste water from described equalizing tank mix with additional flocculating agents and flocculating; Described flocculation agent be known in the art those, such as aluminum salt flocculant and Ferric Salt Flocculants, be preferably aluminum salt flocculant, to reduce the pollution to subsequent film treating processes.Described line mixer be known in the art those, be such as nozzle-type, eddy current type, multiaperture-type or different orifice-plate type mixing tank, the waste water being added with flocculation agent enters mixing tank and fully mixes with coagulating agent, form flocs unit, be convenient to subsequent mechanical strainer and carry out adsorbing, retain, filter.
In the present invention, described single filter system is used for filtering from the flocs unit in the waste water of described line mixer, suspended substance and solid phase impurity, comprise mechanical filter and line strainer, described mechanical filter be known in the art those, be such as quartz sand, multimedium, gac or manganese sand filter, preferred many media, filters, for filtering the waste water from described line mixer, to filter out most suspended substance, colloidalmaterial, COD (chemical oxygen demand (COD)) value of waste water can also be made to reduce about 10%.Described line strainer can be well known in the art those, be such as Y type or basket filter, preferred y-type filter, for filtering the filtrate of described mechanical filter, prevents the filtrate in small, broken bits of mechanical filter from revealing and scratching the machinery that subsequent ultrafiltration equipment membrane element causes.
In the present invention, described cascade filtration system comprises ultrafiltration apparatus and nanofiltration equipment, described ultrafiltration apparatus is used for carrying out uf processing to the waste water after the process of described single filter system, and described nanofiltration equipment is used for carrying out nanofiltration process to the waste water after described ultrafiltration apparatus process.Described ultrafiltration apparatus can be known in the art those, be such as the commercial ultra-filtration equipment of Tao Shi, GE or Dong Li company, make the SDI (pollution index)≤3 of ultra-filtration water, to ensure the normal operation of follow-up reverse osmosis system; Described nanofiltration equipment be known in the art those, be such as the commercially available nanofiltration equipment of Tao Shi, GE or Dong Li company, more than 80% is reduced to make the total hardness of waste water, reduce fouling tendency ion to greatest extent to accumulate in reverse osmosis membrane and supersaturation precipitation, for the long-period stable operation of follow-up reverse osmosis membrane system lays the foundation.
In the present invention, described first-stage reverse osmosis system is used for carrying out reverse-osmosis treated to the waste water after the process of described cascade filtration system.In one preferably embodiment, described first-stage reverse osmosis system comprises the first topping-up pump, the first accurate filter, the first high-pressure pump, the first reverse osmosis equipment and the first dense water tank, wherein, described first topping-up pump is used for carrying out supercharging from the waste water of described cascade filtration system, obtains enough pressure filter through described first accurate filter to make waste water energy; First accurate filter is used for filtering the waste water from described first topping-up pump, normally runs to protect described first reverse osmosis equipment.Described first accurate filter can be known in the art those; be also called cartridge filter; its material for core can be sintering chimney filter, fusion-jet type fabric filter element and honeycomb filter core etc.; preferred honeycomb filter core; be convenient to change, be conducive to Operation and Maintenance and the management of equipment, secondary filter equipment filtering accuracy is 5 μm; to prevent large particulate matter from entering described first reverse osmosis equipment, the reverse osmosis membrane of described first reverse osmosis equipment is protected not scratched by machinery to greatest extent.Described first high-pressure pump for promoting the pressure of the filtrate of described first accurate filter so that smoothly and carry out reverse-osmosis treated.
Described first reverse osmosis equipment is used for carrying out reverse-osmosis treated to the waste water from described first high-pressure pump.Described first reverse osmosis equipment can be those reverse osmosis equipments known in the art, such as Tao Shi, section's formula, day east electrician or the commercially available reverse osmosis equipment of Dong Li company, preferably, the reverse osmosis membrane that described first reverse osmosis adopts is antipollution complex reverse osmosis membrane, the BW30XFR--400/34i type antipollution complex reverse osmosis membrane of such as Dow Chemical, because waste water turbidity after aforementioned processing is low, hardness is low, and TDS (dissolvability solid amount) value is higher, traditional antipollution complex reverse osmosis membrane is used to meet the demands.After reverse osmosis desalination process, can, Waste water concentrating to higher concentration, wastewater flow rate be greatly reduced, contribute to the scale and the cost of investment that reduce subsequent evaporation crystal system.Described first dense water tank is for receiving the seepage remaining liquid of described first reverse osmosis equipment.The penetrating fluid of described first reverse osmosis equipment can directly utilize as the recirculated water in enterprise.
In the present invention, described two-stage reverse osmosis system is used for carrying out reverse-osmosis treated to the seepage remaining liquid of described first reverse osmosis system.Preferably, described two-stage reverse osmosis system comprises the second topping-up pump, the second accurate filter, the second high-pressure pump, the second reverse osmosis equipment and the second dense water tank, wherein, described second topping-up pump is used for carrying out supercharging to the seepage remaining liquid from described first-stage reverse osmosis system; Described second accurate filter is used for filtering the waste water from described second topping-up pump; Described second high-pressure pump is for promoting the pressure of the filtrate of described second accurate filter; Described second reverse osmosis equipment be used for reverse-osmosis treated is carried out to the waste water from described second high-pressure pump, the second reverse osmosis equipment be known in the art those.Water inlet due to the second reverse osmosis equipment is the seepage remaining liquid of the first reverse osmosis equipment, its TDS, hardness Deng Cheng branch is multiplied, in order to process this seepage remaining liquid better, preferably, described second reverse osmosis equipment is the disc tube reverse osmosis (dt-ro) equipment of Pall company of the U.S., the oscillatory shear reinforced film equipment of New Logic company of the U.S. or the ductwork type reverse osmosis membrane equipment of German Tenche company, although aforesaid device is traditionally applied to percolate system, but apply it in the middle of brine waste process field, effectively can solve brine waste process this technical barrier of minimizing process to greatest extent equally.Described second dense water tank is for receiving the seepage remaining liquid of described second reverse osmosis equipment, and the penetrating fluid of described second reverse osmosis equipment can directly utilize as the recirculated water in enterprise.
In the present invention, described evaporation and crystallization system is for making the seepage remaining liquid evaporative crystallization of described two-stage reverse osmosis system, and described evaporation and crystallization system is known in the art, can be such as evaporative crystallizer or evaporation pond, if enterprise's land used is nervous, evaporative crystallizer can be selected to take up an area with saving equipment; If enterprise's land used is more, especially Northwest inland area, wasteland is more, dry, preferably uses evaporation pond process seepage remaining liquid.A large amount of afterheat steams is contained in general factory, and described evaporation and crystallization system can utilize the low-quality afterheat steam of factory as thermal source, this part afterheat steam is introduced evaporation and crystallization system, greatly can reduce the running cost of evaporation crystallization equipment.
In one preferably embodiment, described wastewater treatment equipment also comprises interchanger, described interchanger is arranged between described single filter system and cascade filtration system, to regulate the inflow temperature of described cascade filtration system, the temperature comparing cascade filtration system is as will be described adjusted to 5 DEG C ~ 30 DEG C, preferably 20 DEG C ~ 25 DEG C, to ensure the normal work of subsequent ultrafiltration, nanofiltration, reverse osmosis system film device, reduce to filter pressure drop; Described interchanger can be known in the art those, such as plate-type heat exchanger or shell and tube heat exchanger, preferred plate-type heat exchanger.
In one preferred embodiment, described wastewater treatment equipment also comprises product water tank, and described product water tank for receiving the penetrating fluid of described first-stage reverse osmosis system and two-stage reverse osmosis system, and is sent as recirculated water.
Present invention also offers a kind of method of wastewater treatment, described method comprises: a, waste water introduced equalizing tank and carry out homogeneous and all measure adjustment, adds flocculation agent and waste water is fully flocculated in line mixer in the waste water after regulating; B, the waste water utilizing described mechanical filter and line strainer treatment step a to obtain, to remove flocs unit, suspended substance and the solid phase impurity in waste water, make delivery turbidity≤5NTU; C, utilize described ultrafiltration apparatus to carry out ultrafiltration to the waste water that step b obtains, make ultra-filtration water SDI≤3; Utilize described nanofiltration equipment to carry out nanofiltration to described ultra-filtration water, make the hardness of ultra-filtration water reduce more than 80%; D, carry out reverse-osmosis treated to the waste water that step c obtains, and carry out evaporative crystallization to the seepage remaining liquid obtained after reverse-osmosis treated, the TDS≤1000mg/L of gained penetrating fluid, is sent to circulating water system.
In the present invention, preferably, the TDS value of described waste water is not less than 1500mg/L, more preferably 2000mg/L ~ 6000mg/L, is further preferably 3000mg/L ~ 5000mg/L; The turbidity of described waste water is not less than 10NTU, more preferably 10-25NTU, be further preferably 15-20NTU, and the COD value of described waste water is not less than 100mg/L, more preferably 100-250mg/L, is further preferably 150-200mg/L.It will be understood by those skilled in the art that the These parameters value of described waste water is less, process simpler.More preferably, described waste water is the waste water that petrochemical complex or coal chemical industry enterprises are discharged, comprise water in water circulating system with water, chemical water System drainage and boiler systems sewer, wherein chemical water System drainage comprises the backwashing water of each equipment in wastewater treatment equipment of the present invention, such as hyperfiltration reverse-rinsing water, nanofiltration backwash water etc.
In the present invention, preferably, the secondary counter osmotic treated that reverse-osmosis treated in steps d comprises a reverse-osmosis treated and carries out the seepage remaining liquid of a described reverse-osmosis treated, wherein, TDS≤the 500mg/L of the penetrating fluid of a described reverse-osmosis treated, output is the 60%-70% of the wastewater flow of a described reverse-osmosis treated; TDS≤the 1000mg/L of the penetrating fluid of described secondary counter osmotic treated, output is the 70%-80% of the wastewater flow of described two-pass reverse osmosis process.
In the present invention, preferably, in step c, the waste water that described step b obtains also is added with sterilant before carrying out ultrafiltration.Before ultra-filtration filters, add sterilant can carry out germicidal treatment to waste water, after preventing entering ultra-filtration filters, form bacterium, algal bloom grows and cause ultra-filtration membrane dirty stifled, thus affecting exerting oneself of ultrafiltration apparatus, cause stop cleaning.In addition, sterilant adds after single filter system, makes sterilization and flocculation separately process, prevents the effect of influencing each other of flocculation agent and sterilant medicament and affects the performance of drug effect.Further preferably, in step c, before waste water carries out ultrafiltration, utilize interchanger that temperature is adjusted to 5 DEG C-30 DEG C, be more preferably 20 DEG C-25 DEG C.
Below in conjunction with drawings and Examples, the present invention will be described further.
Embodiment
As shown in Figure 1, the wastewater flow of certain enterprise discharge is 200m
3/ h, the TDS of described waste water is about 4000mg/L ~ 5000mg/L, and turbidity is about 10-20NTU, and COD value is about 150-200mg/L.First described waste water introduced equalizing tank 1 and carried out homogeneous and all measure adjustment, then deliver in line mixer 2 and fully mix with the aluminum salt flocculant added, produce throwing out, form macrobead flocs unit, send in single filter system 3 and filter, filter through mechanical filter 31 in single filter system 3, retain more than 99% macrobead suspended matter, more than 80% colloidalmaterial, delivery turbidity≤5NTU, COD value is about 150mg/L, then removes impurity further through line strainer 32.Waste water after single filter system 3 processes enters interchanger 4 and adjusts the temperature to 22 DEG C ~ 25 DEG C, enter cascade filtration system 5, residue colloidalmaterial is removed through ultrafiltration apparatus 51 in cascade filtration system 5, ultra-filtration water turbidity≤0.5NTU, water outlet SDI≤3, ultra-filtration water enters nanofiltration equipment 52, and nanofiltration makes useless water hardness reduce more than 80%.First-stage reverse osmosis system 6 is entered through removing the waste water firmly, the first reverse osmosis equipment 64 is entered successively through the first topping-up pump 61, first accurate filter 62, first high-pressure pump 63, the seepage remaining liquid obtained enters the first dense water tank 65, wherein penetrating fluid accounts for 60% of the waste water cumulative volume entering first-stage reverse osmosis system, its TDS≤500mg/L, residue 40% is seepage remaining liquid, and its TDS is at 8000mg/L ~ 12000mg/L.Seepage remaining liquid in described first dense water tank 65 is as the former water of two-stage reverse osmosis system 7, enter two-stage reverse osmosis system 7 and carry out reverse-osmosis treated, the second reverse osmosis equipment 74 is entered successively through the second topping-up pump 71, second accurate filter 72, second high-pressure pump 73, the seepage remaining liquid obtained enters the second dense water tank 75, wherein penetrating fluid accounts for 70% of the wastewater volume of two-stage reverse osmosis system, its TDS≤1000mg/L, the TDS >=25000mg/L of seepage remaining liquid.The penetrating fluid of described first-stage reverse osmosis system and two-stage reverse osmosis system pools together and enters product water tank 9 as the use of recirculated water supply enterprise.The comprehensive recovery of above-mentioned waste water is 88%, reclaims water yield 176m
3/ h.The seepage remaining liquid of described two-stage reverse osmosis system 7 sends into evaporative crystallization in evaporative crystallizer 8 further, and the steam of gained can be recycled after condensation, thus realizes wastewater zero discharge.
Claims (10)
1. a wastewater treatment equipment, described wastewater treatment equipment comprises:
Equalizing tank, for receiving pending waste water and making reception waste water mix;
Line mixer, to mix with additional flocculating agents for making the waste water from described equalizing tank and flocculates;
Single filter system, for filtering from the flocs unit in the waste water of described line mixer, suspended substance and solid phase impurity, comprise mechanical filter and line strainer, described mechanical filter is used for filtering the waste water from described line mixer, and described line strainer is used for filtering the filtrate of described mechanical filter;
Cascade filtration system, described cascade filtration system comprises ultrafiltration apparatus and nanofiltration equipment, described ultrafiltration apparatus is used for carrying out uf processing to the waste water after the process of described single filter system, and described nanofiltration equipment is used for carrying out nanofiltration process to the waste water after described ultrafiltration apparatus process;
First-stage reverse osmosis system, for carrying out reverse-osmosis treated to the waste water after the process of described cascade filtration system;
Two-stage reverse osmosis system, for carrying out reverse-osmosis treated to the seepage remaining liquid of described first-stage reverse osmosis system;
Evaporation and crystallization system, for making the seepage remaining liquid evaporative crystallization of described two-stage reverse osmosis system.
2. wastewater treatment equipment according to claim 1, is characterized in that, described wastewater treatment equipment also comprises product water tank, and described product water tank is for receiving the penetrating fluid of described first-stage reverse osmosis system and two-stage reverse osmosis system.
3. wastewater treatment equipment according to claim 1, it is characterized in that, described wastewater treatment equipment also comprises interchanger, and described interchanger is arranged between described single filter system and cascade filtration system, for regulating the temperature of the waste water after the process of described single filter system.
4. wastewater treatment equipment according to claim 1, is characterized in that, described first-stage reverse osmosis system comprises:
First topping-up pump, for carrying out supercharging from the waste water of described cascade filtration system;
First cartridge filter, for filtering the waste water from described first topping-up pump;
First high-pressure pump, for promoting the pressure of the filtrate of described first cartridge filter;
First reverse osmosis equipment, for carrying out reverse-osmosis treated to the waste water from described first high-pressure pump;
First dense water tank, for receiving the seepage remaining liquid of described first-stage reverse osmosis equipment;
Described two-stage reverse osmosis system comprises:
Second topping-up pump, for carrying out supercharging from the waste water of described cascade filtration system;
Second cartridge filter, for filtering the waste water from described second topping-up pump;
Second high-pressure pump, for promoting the pressure of the filtrate of described second cartridge filter;
Second reverse osmosis equipment, for carrying out reverse-osmosis treated to the waste water from described second high-pressure pump;
Second dense water tank, for receiving the seepage remaining liquid of described second-level reverse osmosis device.
5. the wastewater treatment equipment according to any one of claim 1-4, is characterized in that, the reverse osmosis membrane that described first reverse osmosis equipment adopts is antipollution complex reverse osmosis membrane; Described second reverse osmosis equipment is disc tube reverse osmosis (dt-ro) film device, oscillatory shear reinforced film equipment or ductwork type reverse osmosis membrane equipment.
6. adopt a method for the wastewater treatment equipment process waste water according to any one of claim 1-5, comprise the steps:
A, waste water introduced equalizing tank and carry out homogeneous and all measure adjustment, in the waste water after regulating, add flocculation agent and waste pipe mixing tank is fully flocculated;
B, the waste water utilizing described mechanical filter and line strainer treatment step a to obtain, to remove flocs unit, suspended substance and the solid phase impurity in waste water, make delivery turbidity≤5NTU;
C, utilize described ultrafiltration apparatus to carry out ultrafiltration to the waste water that step b obtains, make ultra-filtration water SDI≤3; Utilize described nanofiltration equipment to carry out nanofiltration to described ultra-filtration water, remove the hardness ions of in ultra-filtration water more than 80%;
D, reverse-osmosis treated is carried out to the waste water that step c obtains, and evaporative crystallization is carried out to the seepage remaining liquid obtained after reverse-osmosis treated; TDS≤the 600mg/L of reverse-osmosis treated gained penetrating fluid.
7. method according to claim 6, is characterized in that, the TDS of described waste water is not less than 1500mg/L, and turbidity is not less than 10NTU, and the COD value of described waste water is not less than 100mg/L.
8. method according to claim 7, is characterized in that, in step c, the waste water that described step b obtains adds sterilant before carrying out ultrafiltration.
9. method according to claim 8, is characterized in that, in step c, the waste water that described step b obtains utilizes interchanger that temperature is adjusted to 5 DEG C-30 DEG C before carrying out ultrafiltration.
10. the method according to any one of claim 6-9, is characterized in that, in step c, and the TDS≤300mg/L of the seepage remaining liquid of described first-stage reverse osmosis system, output is the 65%-75% of the wastewater flow of described first-stage reverse osmosis system process; TDS≤the 1000mg/L of the seepage remaining liquid of described two-stage reverse osmosis system, output is the 55%-65% of the wastewater flow of described two-stage reverse osmosis system process.
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