CN107445377A - A kind of biochemical waste water Zero-discharge treating process and processing system - Google Patents
A kind of biochemical waste water Zero-discharge treating process and processing system Download PDFInfo
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- CN107445377A CN107445377A CN201710676253.4A CN201710676253A CN107445377A CN 107445377 A CN107445377 A CN 107445377A CN 201710676253 A CN201710676253 A CN 201710676253A CN 107445377 A CN107445377 A CN 107445377A
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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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- 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
- C02F1/44—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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- 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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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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Abstract
The invention belongs to water treatment field, is related to a kind of biochemical waste water Zero-discharge treating process and processing system.The technique includes：Biochemical waste water obtains the first fresh water and the first concentrated water after mechanical filter, ultrafiltration system obtain pretreated waste water into nanofiltration system successively；First concentrated water obtains the second fresh water and the second concentrated water by SUPER NF membranous systems, and the second concentrated water enters concentrate collecting pit 1；First fresh water and the second fresh water pass sequentially through the 5th concentrated water that reverse osmosis membrane system, sea-water reverse osmose membranous system, SUPER RO membranous systems are handled to obtain and enter concentrate collecting pit 2；The 3rd fresh water that is obtained through reverse osmosis membrane system, the 4th fresh water obtained through sea-water reverse osmose membranous system and through the 5th fresh water collecting that SUPER RO membranous systems obtain to reuse pool reuse；Concentrate collecting pit 1, concentrate collecting pit 2 are respectively by vapo(u)rization system corresponding to the second concentrated water being collected into and the entrance of the 5th concentrated water.The present invention realizes the zero-emission of biochemical waste water by carrying out a series of processing to biochemical waste water.
Description
Technical field
The invention belongs to water treatment field, more particularly to a kind of biochemical waste water Zero-discharge treating process and processing system.
Background technology
Biochemical waste water is directly entered MVR vapo(u)rization systems by traditional sewage disposal system mostly, but due in biochemical waste water
COD is higher, suspension content is high, hardness is high so that MVR needs frequent clean, causes MVR whole system disposal abilities not reach
The 80% of designed capacity.In order to improve the disposal ability of Treated sewage reusing, sewage intercepting well rate is improved, makes every effort to reach bio-chemical effluent processing
Directly reuse up to standard afterwards, progress is a series of to research and solve the problems such as hardness is high, COD is high, reaches recycle water standard as far as possible, realizes life
Change the zero-emission of waste water.
The common hard method that removes has heating, medicament tenderizer and ion-exchange in front-end processing.Comparatively speaking, add
Hot method is simple to operate, but the temporary hardness and energy consumption that can only go in water removal are high, especially when biochemical waste water amount is larger, extremely
It is uneconomical.Medicament tenderizer includes lime softening method and lime-soda ash tenderizer, and lime softening method occurs one by adding medicament
The chemical reaction of series, makes the Ca in water2+And Mg2+Precipitation reduces temporary hardness in water, but the permanent hardness in water and negative
Hardness can not be removed, and Mg is contained in biochemical waste water2+Permanent hardness and negative hardness；Although lime-soda ash tenderizer can be reduced in water
Permanent hardness and negative hardness, but chemical feeding quantity is huge, and operating cost is too high, and complex operation is cumbersome.Ion-exchange is to hardness
Removal it is fast and effective thoroughly, hardness is too high for resin, and resin fails within a very short time, and regeneration frequency is too high, is
Easy fluctuation of service of uniting and regenerative agent consumption is very big, operating cost is very high.
Current the most widely used COD removing methods have：Absorption method, coagulation clarification and enhanced coagulation processing, Fenton
Oxidative treatment organic wastewater with difficult degradation thereby and biochemical process etc..Medium adsorbance is limited in absorption method, and high COD can make adsorbing medium very
Fast failure can shorten the service life of adsorbing medium, increase system operation expense, it is necessary to the frequency of regeneration is very high.Coagulation clarification
Need to add various chemical medicaments with enhanced coagulation processing, Fenton oxidation method, and dosage is big, effect is unstable.Biochemical process
It is a kind of current organics removal pollution means of cost performance highest, but to biochemical is poor, not biodegradable, strong toxicity
Waste water, biochemical process can not meet.
For Treated sewage reusing and advanced treatment of wastewater, currently used technology is using conventional roll counter-infiltration as core
" UF+RO " technique, but the rate of recovery typically needs to handle in 60-80%, also 20-40% concentrated water, and this part concentrated water substantially passes through
MVR evaporates, and energy consumption is higher, and operating cost is big, and factory is difficult to bear.
In order to solve the above problems, and the zero-emission of biochemical waste water is realized, the present inventor provides a kind of biochemical waste water zero-emission
Put handling process and processing system.
The content of the invention
A kind of the shortcomings that it is an object of the invention to overcome prior art, there is provided processing work for realizing biochemical waste water zero-emission
Skill and processing system.
The present invention is achieved through the following technical solutions：
A kind of biochemical waste water Zero-discharge treating process, it comprises the following steps：
（1）Biochemical waste water obtains pretreated waste water by mechanical filter, ultrafiltration system successively；
（2）The pretreated waste water obtains the first fresh water and the first concentrated water into nanofiltration system；
（3）First concentrated water handles to obtain the second fresh water and the second concentrated water, second concentrated water by SUPER NF membranous systems
It is directly entered concentrate collecting pit 1；
（4）First fresh water and second fresh water pass sequentially through reverse osmosis membrane system, sea-water reverse osmose membranous system, SUPER
The 5th concentrated water that RO membranous systems are handled to obtain is directly entered concentrate collecting pit 2；
（5）The 3rd fresh water that is obtained by the reverse osmosis membrane system, the 4th obtained by the sea-water reverse osmose membranous system
The 5th fresh water collecting that fresh water and the process SUPER RO membranous systems obtain carries out reuse to reuse pool；
（6）Second concentrated water that the concentrate collecting pit 1 is collected into obtains condensed water into the evaporative crystallization of vapo(u)rization system 1
1, the condensed water 1 is collected into reuse pool reuse.
（7）The 5th concentrated water that the concentrate collecting pit 2 is collected into is obtained into the evaporative crystallization of vapo(u)rization system 2 cold
Condensate 2, the condensed water 2 is collected into reuse pool reuse.
Described mechanical filter pre-processes as prime, uses double-layer filter material；Further, filtrate is quartz sand and nothing
Bituminous coal；Further, upper strata anthracite, lower floor's quartz sand, and upper strata anthracite 400mm/1.2~2.5mm, lower floor's quartz sand
800mm/0.5~1.2mm, larger particles in water are removed in mechanical filter top layer, smaller particle mechanical filter compared with
Depths is removed.
Described ultrafiltration system is acted on using the Physical entrapment of milipore filter, fine particle, suspension, the colloid gone in water removal
Deng reducing the turbidity of water, the system uses inner loop cross-flow filtration mode, pollution of the pollution remission thing to film surface, extends
The backwashing period of film.Bactericide sodium hypochlorite is added in ultrafiltration system, microorganism and bacterium in biochemical waste water is killed, keeps away
Exempt from it and cause microorganism pollution in film surface colonization.
Biochemical waste water obtains SS≤1mg/L in described pretreated waste water, turbidity by mechanical filter and ultrafiltration system
≤5NTU。
Further, described pretreated waste water stores and by receiving in ultrafiltration production pond is advanced into nanofiltration system
Filter system boost is pumped to nanofiltration system, and the pretreated waste water adds reducing agent sodium sulfite before the nanofiltration system is entered
With the processing of silico-calcium antisludging agent, reducing agent sodium sulfite avoids the oxidant in the pretreated waste water from damaging follow-up film processing system
Middle membrane component, silico-calcium antisludging agent prevent precipitation of the slightly solubility inorganic salts on film surface, fouling.
In addition, the nanofiltration system is arranged using the segmented mode of one-level three, so as to ensure the system rate of recovery and effluent quality.Receive
Filter system retains most of divalent salts in pretreated waste water, COD etc., mitigates the processing load of subsequent treatment membranous system.
Further, the first described concentrated water adds the processing of silico-calcium antisludging agent before SUPER NF membranous systems are entered, and prevents
First concentrated water middle and high concentration slightly solubility inorganic salts caused by nanofiltration system precipitate fouling on film surface.
Further, described seawater reverse osmosis membrane operating pressure≤81bar.
Further, COD≤500mg/L of the biochemical waste water, TDS≤5000mg/L, the mg/L of total nitrogen≤200, total phosphorus
≤15mg/L。
A kind of biochemical waste water zero-discharge treatment system, including：
Mechanical filter；
The ultrafiltration system being connected with the mechanical filter；
The nanofiltration system being connected with the ultrafiltration system；
The SUPER NF membranous systems and reverse osmosis membrane system being connected with the nanofiltration system；
The sea-water reverse osmose membranous system being connected with the reverse osmosis membrane system；
The SUPER RO membranous systems being connected with the sea-water reverse osmose membranous system；
Wherein：
The SUPER NF membranous systems are connected with the reverse osmosis membrane system；
The SUPER NF membranous systems communicate with concentrate collecting pit 1；
The SUPER RO membranous systems communicate with concentrate collecting pit 2；
The reverse osmosis membrane system, the sea-water reverse osmose membranous system, the SUPER RO membranous systems connect with reuse pool respectively
Connect；
The concentrate collecting pit 1 is connected with vapo(u)rization system 1, and the vapo(u)rization system 1 is connected with the reuse pool；
The concentrate collecting pit 2 is connected with vapo(u)rization system 2, and the vapo(u)rization system 2 is connected with the reuse pool.
The second concentrated water in heretofore described concentrate collecting pit 1 carries out chemical tendering before entering vapo(u)rization system 1；It is described
The 5th concentrated water carries out chemical tendering to reduce the maintenance frequency of two vapo(u)rization systems before entering vapo(u)rization system 2 in concentrate collecting pit 2
Rate.
The invention has the advantages that：
（1）Each system automation degree of the present invention is high, PLC can be used to control, directly set operating condition, realizes full-automatic continuous
The method of operation, human cost is saved；
（2）The equipment used in the present invention is readily disassembled reassembly ＆ maintenance, easy to maintenance quick, and can locally replace, and avoids " dress
Put/system integral replacing ", reduce the maintenance cost in later stage；
（3）Present invention process front end carries out the pretreatment of biochemical waste water, reduces and damages membranous system larger material composition, so as to
Follow-up membranous system is played a very good protection, extends the service life of membranous system, reduces frequency of maintenance, it is whole so as to reduce
Systems/processes operating cost；
（4）Technique/system Construction cycle of the present invention is relatively short, and can debug success within a short period of time, reduces early stage
Time input, shortened the construction period, in addition using membranous system filtering technique, reduced the evaporation input in later stage, and membranous system
Filtering technique is relative relatively low with evaporation input, so as to reduce cost of investment；
（5）Present invention process/system realizes the zero-emission of biochemical waste water, relative to conventional qualified discharge by a series of processing
Tupe, the present invention obtain more thorough to wastewater treatment, it is not easy to secondary environmental pollution occur, realization shows to carry using the present invention
The water quality that the PROCESS FOR TREATMENT of confession obtains meets industrial reuse water quality standard；
（6）The technique is divided to two vapo(u)rization system evaporations, and the salt for evaporating to obtain is separable to be recycled, and reduces being processed into for solid waste
This, and create certain economic value.
Brief description of the drawings
In order to illustrate more clearly of technical solution of the present invention, the accompanying drawing used required for the present invention will be made simply below
Introduce, it should be apparent that, drawings discussed below is only present invention process flow, for those of ordinary skill in the art,
On the premise of not paying creative work, still other accompanying drawings can be obtained according to the accompanying drawing of offer.
Fig. 1 is biochemical waste water Zero-discharge treating process flow chart provided by the invention.
Embodiment
Clear, complete description is carried out to the technical scheme in the embodiment of the present invention below, it is clear that described embodiment
Only part of the embodiment of the present invention, rather than whole embodiments.Based on embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to the scope of the present invention.
The invention provides a kind of biochemical waste water Zero-discharge treating process, it comprises the following steps：
（1）Biochemical waste water obtains pretreated waste water by mechanical filter, ultrafiltration system successively；
（2）The pretreated waste water obtains the first fresh water and the first concentrated water into nanofiltration system；
（3）First concentrated water handles to obtain the second fresh water and the second concentrated water, second concentrated water by SUPER NF membranous systems
It is directly entered concentrate collecting pit 1；
（4）First fresh water and second fresh water pass sequentially through reverse osmosis membrane system, sea-water reverse osmose membranous system, SUPER
The 5th concentrated water that RO membranous systems are handled to obtain is directly entered concentrate collecting pit 2；
（5）The 3rd fresh water that is obtained by the reverse osmosis membrane system, the 4th obtained by the sea-water reverse osmose membranous system
The 5th fresh water collecting that fresh water and the process SUPER RO membranous systems obtain carries out reuse to reuse pool；
（6）Second concentrated water that the concentrate collecting pit 1 is collected into obtains condensed water into the evaporative crystallization of vapo(u)rization system 1
1, the condensed water 1 is collected into reuse pool reuse.
（7）The 5th concentrated water that the concentrate collecting pit 2 is collected into is obtained into the evaporative crystallization of vapo(u)rization system 2 cold
Condensate 2, the condensed water 2 is collected into reuse pool reuse.
COD≤500mg/L of present invention process mesophytization waste water, TDS≤5000mg/L, the mg/L of total nitrogen≤200, total phosphorus
≤15mg/L。
Mechanical filter and ultrafiltration system pre-process as front end in present invention process；Mechanical filter is filtered using double-deck
Material, filtrate are quartz sand and anthracite, upper strata anthracite, lower floor's quartz sand, and upper strata anthracite 400mm/1.2~2.5mm, under
Layer quartz sand 800mm/0.5~1.2mm, larger particles in water is removed in mechanical filter top layer, smaller particle is in machinery
Filter higher depth is removed.Mechanical filter water outlet enters ultrafiltration system, is acted on using the Physical entrapment of milipore filter, goes to remove water
In fine particle, suspension, colloid etc., reduce the turbidity of water, the system uses inner loop cross-flow filtration mode, alleviated dirty
Pollution of the thing to film surface is contaminated, extends the backwashing period of film.Bactericide sodium hypochlorite is added in ultrafiltration system, is killed biochemical
Microorganism and bacterium in waste water, avoid it from causing microorganism pollution in film surface colonization.Biochemical waste water passes through mechanical filter
SS≤1mg/L in described pretreated waste water, turbidity≤5NTU are obtained with ultrafiltration system.
Ultrafiltration system water outlet enters ultrafiltration production pond storage, and ultrafiltration is produced waste water in pond and is delivered to nanofiltration by nanofiltration booster pump
System, nanofiltration system are arranged using the segmented mode of one-level three, ensure the system rate of recovery and effluent quality.Nanofiltration system has retention work(
Can, most of divalent salts, COD etc. in pretreated waste water are trapped in the concentrated water side of film, born with mitigating the processing of follow-up membranous system
Lotus.In addition pretreated waste water adds reducing agent sodium sulfite and silico-calcium antisludging agent before nanofiltration system is entered after nanofiltration booster pump
Processing, reducing agent sodium sulfite avoid the oxidant in pretreated waste water from damaging membrane component in follow-up film processing system, silico-calcium resistance
Dirty agent prevents precipitation of the slightly solubility inorganic salts on film surface, fouling.
The first concentrated water after nanofiltration system is after SUPER NF booster pumps, cartridge filter, high-pressure pump, circulating pump
Into SUPER NF membranous systems, SUPER NF membrane components have high resistant to pollution performance.It is dense in the forward direction first of cartridge filter
Water adds the processing of silico-calcium antisludging agent, prevents that the first concentrated water middle and high concentration slightly solubility inorganic salts sink on film surface caused by nanofiltration system
Shallow lake fouling.
It is by the first fresh water caused by nanofiltration system and laggard by the second mixing of fresh water caused by SUPER NF membranous systems
Enter reverse osmosis membrane system.Enter concentrate collecting pit 1 by the second concentrated water caused by SUPER NF membranous systems.Counter-infiltration system is cut
Electrical conductivity, ammonia nitrogen and the total nitrogen of the first fresh water and the second mixing of fresh water water are stayed, the water quality reaching standard of the 3rd fresh water caused by guarantee.Instead
Membranous system is permeated to electrical conductivity clearance close to 99%, but to be resistant to operating pressure limited for reverse osmosis membrane system, cycles of concentration has
Limit, the system rate of recovery can only achieve 75%.
The 3rd concentrated water is reduced into sea-water reverse osmose membranous system by the 3rd concentrated water caused by reverse osmosis membrane system
Change processing the 4th concentrated water of generation and the 4th fresh water, the 4th fresh water are directly entered reuse pool；Seawater reverse osmosis membrane system operatio pressure
Power≤81bar.
4th concentrated water is delivered in SUPER RO membranous systems by SUPER RO booster pumps, utilizes SUPER RO membranous systems
Superelevation resistance to pressure and high resistance tocrocking, improve the total system rate of recovery.5th concentrated water caused by SUPER RO membranous systems enters dense
Contracting liquid collecting pit 2, the 5th fresh water enter reuse pool reuse.
Each system automation degree of the present invention is high, PLC can be used to control, and directly sets operating condition, and realization automatically connects
Reforwarding line mode, has saved human cost；The equipment that the present invention uses is readily disassembled reassembly ＆ maintenance, easy to maintenance quick, and can
With local replacement, " device/system integral replacing " is avoided, reduces the maintenance cost in later stage；Given birth to present invention process front end
Change the pretreatment of waste water, reduce and damage membranous system larger material composition, so as to play good protection to follow-up membranous system
Effect, extend the service life of membranous system, frequency of maintenance is reduced, so as to reduce whole system/process operation cost；The present invention's
Technique/system Construction cycle is relatively short, and can debug success within a short period of time, reduces the time input of early stage, shortens
Construction period, in addition using membranous system filtering technique, reduce the evaporation input in later stage, and membranous system filtering technique is relative with steaming
Hair input is relatively low, so as to reduce cost of investment；Present invention process/system realizes the zero of biochemical waste water by a series of processing
Discharge, relative to conventional qualified discharge tupe, the present invention obtains more thorough to wastewater treatment, it is not easy to the dirt of two secondary environments occurs
Dye, realize that the water quality for showing to obtain using PROCESS FOR TREATMENT provided by the invention meets industrial reuse water quality standard；The technique is divided to two
Vapo(u)rization system is evaporated, and evaporates the obtained separable processing cost for recycling, reducing solid waste of salt, and create certain economic valency
Value.I.e. the present invention realizes the zero-emission of biochemical waste water, relative to Routine purges by carrying out a series of processing to biochemical waste water
Tupe, processing mode provided by the invention are more thorough to biochemical waste water processing, it is not easy to cause secondary pollution, and save
Cost of investment, operating cost, maintenance cost and the human cost of project.
In addition, the invention provides a kind of biochemical waste water zero-discharge treatment system, including：
Mechanical filter；
The ultrafiltration system being connected with the mechanical filter；
The nanofiltration system being connected with the ultrafiltration system；
The SUPER NF membranous systems and reverse osmosis membrane system being connected with the nanofiltration system；
The sea-water reverse osmose membranous system being connected with the reverse osmosis membrane system；
The SUPER RO membranous systems being connected with the sea-water reverse osmose membranous system；
Wherein：
The SUPER NF membranous systems are connected with the reverse osmosis membrane system；
The SUPER NF membranous systems communicate with concentrate collecting pit 1；
The SUPER RO membranous systems communicate with concentrate collecting pit 2；
The reverse osmosis membrane system, the sea-water reverse osmose membranous system, the SUPER RO membranous systems connect with reuse pool respectively
Connect；
The concentrate collecting pit 1 is connected with vapo(u)rization system 1, and the vapo(u)rization system 1 is connected with the reuse pool；
The concentrate collecting pit 2 is connected with vapo(u)rization system 2, and the vapo(u)rization system 2 is connected with the reuse pool.
The second concentrated water in heretofore described concentrate collecting pit 1 carries out chemical tendering before entering vapo(u)rization system 1；It is described
The 5th concentrated water carries out chemical tendering to reduce the maintenance frequency of two vapo(u)rization systems before entering vapo(u)rization system 2 in concentrate collecting pit 2
Rate.
Referring to Fig. 1, Fig. 1 is a kind of biochemical waste water Zero-discharge treating process flow chart provided by the invention.The place of the present invention
Reason system includes mechanical filter, ultrafiltration system, nanofiltration system, SUPER NF membranous systems, reverse osmosis membrane system, sea-water reverse osmose
Membranous system, SUPER RO membranous systems, concentrate collecting pit 1, vapo(u)rization system 1, concentrate collecting pit 2, vapo(u)rization system 2 and recycle-water
Pond.
In the present invention, the reuse pool is used to collect the 3rd fresh water, the 4th fresh water and the 5th fresh water.
For the sake of becoming apparent from, it is described in detail below by specific embodiment.
Embodiment 1
Biochemical waste water zero-discharge treatment system
The processing system that the present embodiment provides includes：Mechanical filter；The ultrafiltration system being connected with the mechanical filter；With
The nanofiltration system that the ultrafiltration system is connected；The SUPER NF membranous systems and counter-infiltration membrane system being connected with the nanofiltration system
System；The sea-water reverse osmose membranous system being connected with the reverse osmosis membrane system；It is connected with the sea-water reverse osmose membranous system
SUPER RO membranous systems；
Wherein：The SUPER NF membranous systems are connected with the reverse osmosis membrane system；The SUPER NF membranous systems and concentration
Liquid collecting pit 1 communicates；The SUPER RO membranous systems communicate with concentrate collecting pit 2；The reverse osmosis membrane system, the seawater
Reverse osmosis membrane system, the SUPER RO membranous systems are connected with reuse pool respectively；The concentrate collecting pit 1 and vapo(u)rization system
1 is connected, and the vapo(u)rization system 1 is connected with the reuse pool；The concentrate collecting pit 2 is connected with vapo(u)rization system 2, institute
Vapo(u)rization system 2 is stated to be connected with the reuse pool.
Processing system running provided by the invention is as follows：Biochemical waste water is successively by mechanical filter, ultrafiltration system
Obtain pretreated waste water；The pretreated waste water obtains the first fresh water and the first concentrated water into nanofiltration system；Described first is dense
Water handles to obtain the second fresh water and the second concentrated water by SUPER NF membranous systems, and second concentrated water is directly entered concentrate collection
Pond 1；First fresh water and second fresh water pass sequentially through reverse osmosis membrane system, sea-water reverse osmose membranous system, SUPER RO
The 5th concentrated water that membranous system is handled to obtain is directly entered concentrate collecting pit 2；Obtained by the reverse osmosis membrane system
What the 3rd fresh water, the 4th fresh water obtained by the sea-water reverse osmose membranous system and the process SUPER RO membranous systems obtained
5th fresh water collecting carries out reuse to reuse pool；Second concentrated water that the concentrate collecting pit 1 is collected into, which enters, steams
The evaporative crystallization of hair system 1 obtains condensed water 1, and the condensed water 1 is collected into reuse pool reuse.By the concentrate collecting pit
2 the 5th concentrated waters being collected into obtain condensed water 2 into the evaporative crystallization of vapo(u)rization system 2, and the condensed water 2 is collected into reuse
Pond reuse.
Into biochemical waste water COD≤500mg/L of the processing system, TDS≤5000mg/L, total nitrogen≤200mg/L, total phosphorus
≤15mg/L。
Double-layer filter material is used in mechanical filter, double-layer filter material is quartz sand and anthracite, and upper strata is anthracite, smokelessly
Coal 400mm/1.2~2.5mm, lower floor are quartz sand, quartz sand 800mm/0.5~1.2mm, by larger particles in water in mechanical mistake
Filter top layer is removed, and smaller particle is removed in mechanical filter higher depth.Mechanical filter water outlet enters ultrafiltration system, profit
Acted on the Physical entrapment of milipore filter, the fine particle that goes in water removal, suspension, colloid etc., reduce the turbidity of water, the system is adopted
With inner loop cross-flow filtration mode, pollution of the pollution remission thing to film surface, extend the backwashing period of film.In ultrafiltration system
Middle addition bactericide sodium hypochlorite, kills the microorganism and bacterium in biochemical waste water, avoids it from causing micro- life in film surface colonization
Thing pollutes.Biochemical waste water obtains SS≤1mg/L in described pretreated waste water by mechanical filter and ultrafiltration system, and turbidity≤
5NTU。
Ultrafiltration system water outlet enters ultrafiltration production pond storage, and ultrafiltration is produced waste water in pond and is delivered to nanofiltration by nanofiltration booster pump
System, nanofiltration system are arranged using the segmented mode of one-level three, ensure the system rate of recovery and effluent quality.Nanofiltration system has retention work(
Can, most of divalent salts, COD etc. in pretreated waste water are trapped in the concentrated water side of film, born with mitigating the processing of follow-up membranous system
Lotus.In addition pretreated waste water adds reducing agent sodium sulfite and silico-calcium antisludging agent before nanofiltration system is entered after nanofiltration booster pump
Processing, reducing agent sodium sulfite avoid the oxidant in pretreated waste water from damaging membrane component in follow-up film processing system, silico-calcium resistance
Dirty agent prevents precipitation of the slightly solubility inorganic salts on film surface, fouling.
The first concentrated water after nanofiltration system is after SUPER NF booster pumps, cartridge filter, high-pressure pump, circulating pump
Into SUPER NF membranous systems, SUPER NF membrane components have high resistant to pollution performance.It is dense in the forward direction first of cartridge filter
Water adds the processing of silico-calcium antisludging agent, prevents that the first concentrated water middle and high concentration slightly solubility inorganic salts sink on film surface caused by nanofiltration system
Shallow lake fouling.
It is by the first fresh water caused by nanofiltration system and laggard by the second mixing of fresh water caused by SUPER NF membranous systems
Enter reverse osmosis membrane system.Enter concentrate collecting pit 1 by the second concentrated water caused by SUPER NF membranous systems.Counter-infiltration system is cut
Electrical conductivity, ammonia nitrogen and the total nitrogen of the first fresh water and the second mixing of fresh water water are stayed, the water quality reaching standard of the 3rd fresh water caused by guarantee.Instead
Membranous system is permeated to electrical conductivity clearance close to 99%, but to be resistant to operating pressure limited for reverse osmosis membrane system, cycles of concentration has
Limit, the system rate of recovery can only achieve 75%.
The 3rd concentrated water is reduced into sea-water reverse osmose membranous system by the 3rd concentrated water caused by reverse osmosis membrane system
Change processing the 4th concentrated water of generation and the 4th fresh water, the 4th fresh water are directly entered reuse pool；Seawater reverse osmosis membrane system operatio pressure
Power≤81bar.
4th concentrated water is delivered in SUPER RO membranous systems by SUPER RO booster pumps, utilizes SUPER RO membranous systems
Superelevation resistance to pressure and high resistance tocrocking, improve the total system rate of recovery.5th concentrated water caused by SUPER RO membranous systems enters dense
Contracting liquid collecting pit 2, the 5th fresh water enter reuse pool reuse.
The concentrated water into concentrate collecting pit 1 obtains condensed water 1 by the evaporation of vapo(u)rization system 1 and is collected into recycle-water
Pond；The concentrated water into concentrate collecting pit 2 obtains condensed water 2 by the evaporation of vapo(u)rization system 2 and is collected into reuse pool；Reuse
Water quality meets industrial water recycle water standard in pond.
To reduce the frequency of maintenance of vapo(u)rization system, second concentrated water enters vapo(u)rization system 1, concentration in concentrate collects 1 respectively
The 5th concentrated water carries out chemical tendering before entering vapo(u)rization system 2 in liquid collecting pit 2.
Embodiment 2
Biochemical waste water Zero-discharge treating process
Biochemical waste water：Day output：12000t/d, TDS：5000mg/L, COD：500mg/L, total nitrogen：200mg/L, total phosphorus：
15mg/L。
Zero discharge treatment is carried out to biochemical waste water using the processing system that embodiment 1 provides, detects water quality in reuse pool：
TDS 275.35 mg/L, COD 26.3 mg/L, the mg/L of total hardness 2.07, the mg/L of total nitrogen 9.76, the mg/L of total phosphorus 0.11 are full
Sufficient industry water reuse standard.
Embodiment 3
Biochemical waste water Zero-discharge treating process
Biochemical waste water：Day output：10000t/d, TDS：4000mg/L, COD：400mg/L, total nitrogen：180mg/L, total phosphorus：
12mg/L。
Zero discharge treatment is carried out to biochemical waste water using the processing system that embodiment 1 provides, detects water quality in reuse pool：
TDS 180 mg/L, COD 18.2 mg/L, total hardness 1.87mg/L, total nitrogen 7.35mg/L, the mg/L of total phosphorus 0.08, meet industry
Water circulation standard.
Embodiment 4
Biochemical waste water Zero-discharge treating process
Biochemical waste water：Day output：6000t/d, TDS：3825mg/L, COD：365mg/L, total nitrogen：158mg/L, total phosphorus：
13mg/L。
Zero discharge treatment is carried out to biochemical waste water using the processing system that embodiment 1 provides, detects water quality in reuse pool：
TDS 89mg/L, COD 12mg/L, total hardness 1.35 mg/L, total nitrogen 6.83mg/L, the mg/L of total phosphorus 0.06, meet that industry water returns
Use standard.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill of the art
For personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of biochemical waste water Zero-discharge treating process, it is characterised in that it comprises the following steps：
（1）Biochemical waste water obtains pretreated waste water by mechanical filter, ultrafiltration system successively；
（2）The pretreated waste water obtains the first fresh water and the first concentrated water into nanofiltration system；
（3）First concentrated water handles to obtain the second fresh water and the second concentrated water, second concentrated water by SUPER NF membranous systems
It is directly entered concentrate collecting pit 1；
（4）First fresh water and second fresh water pass sequentially through reverse osmosis membrane system, sea-water reverse osmose membranous system, SUPER
The 5th concentrated water that RO membranous systems are handled to obtain is directly entered concentrate collecting pit 2；
（5）The 3rd fresh water that is obtained by the reverse osmosis membrane system, the 4th obtained by the sea-water reverse osmose membranous system
The 5th fresh water collecting that fresh water and the process SUPER RO membranous systems obtain carries out reuse to reuse pool；
（6）Second concentrated water that the concentrate collecting pit 1 is collected into obtains condensed water into the evaporative crystallization of vapo(u)rization system 1
1, the condensed water 1 is collected into reuse pool reuse；
（7）The 5th concentrated water that the concentrate collecting pit 2 is collected into obtains condensed water into the evaporative crystallization of vapo(u)rization system 2
2, the condensed water 2 is collected into reuse pool reuse.
A kind of 2. biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described mechanical filter
Filtrate is quartz sand and anthracite in device.
A kind of 3. biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described ultrafiltration system
Middle bactericide is sodium hypochlorite.
4. a kind of biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described pretreatment is given up
SS≤1mg/L in water, turbidity≤5NTU.
5. a kind of biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described pretreatment is given up
Water needs to add reducing agent sodium sulfite and the processing of silico-calcium antisludging agent before the nanofiltration system is entered.
A kind of 6. biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described nanofiltration system
Arranged using the segmented mode of one-level three.
A kind of 7. biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that the first described concentrated water
The processing of silico-calcium antisludging agent is added before SUPER NF membranous systems are entered.
A kind of 8. biochemical waste water Zero-discharge treating process according to claim 1, it is characterised in that described seawater reverse osmosis
Membrane system operating pressure≤81bar.
A kind of 9. biochemical waste water Zero-discharge treating process according to claim any one of 1-8, it is characterised in that the life
Change COD≤500mg/L of waste water, TDS≤5000mg/L, the mg/L of total nitrogen≤200, total phosphorus≤15mg/L.
10. a kind of biochemical waste water zero-discharge treatment system, it is characterised in that it includes：
Mechanical filter；
The ultrafiltration system being connected with the mechanical filter；
The nanofiltration system being connected with the ultrafiltration system；
The SUPER NF membranous systems and reverse osmosis membrane system being connected with the nanofiltration system；
The sea-water reverse osmose membranous system being connected with the reverse osmosis membrane system；
The SUPER RO membranous systems being connected with the sea-water reverse osmose membranous system；
Wherein：
The SUPER NF membranous systems are connected with the reverse osmosis membrane system；
The SUPER NF membranous systems communicate with concentrate collecting pit 1；
The SUPER RO membranous systems communicate with concentrate collecting pit 2；
The reverse osmosis membrane system, the sea-water reverse osmose membranous system, the SUPER RO membranous systems connect with reuse pool respectively
Connect；
The concentrate collecting pit 1 is connected with vapo(u)rization system 1, and the vapo(u)rization system 1 is connected with the reuse pool；
The concentrate collecting pit 2 is connected with vapo(u)rization system 2, and the vapo(u)rization system 2 is connected with the reuse pool.
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| CN110697963A (en) * | 2019-11-11 | 2020-01-17 | 苏州澄江环境科技有限公司 | Method and system for treating biochemical wastewater evaporative crystallization zero mother liquor |
| CN111533332A (en) * | 2020-05-09 | 2020-08-14 | 江苏澳特克环境科技有限公司 | Filtering process for emulsified waste liquid |
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Application publication date: 20171208 |