CN101074141B - Process for regenerating, recovering and reutilizing low-concentration organic waste water - Google Patents

Process for regenerating, recovering and reutilizing low-concentration organic waste water Download PDF

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Publication number
CN101074141B
CN101074141B CN200710011788A CN200710011788A CN101074141B CN 101074141 B CN101074141 B CN 101074141B CN 200710011788 A CN200710011788 A CN 200710011788A CN 200710011788 A CN200710011788 A CN 200710011788A CN 101074141 B CN101074141 B CN 101074141B
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water
waste water
filler
low
internal recycle
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CN101074141A (en
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张兴文
童健
李文霞
丁会请
邓文涛
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Dalian Chunxing Science & Technology Co., Ltd.
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Chunxing Water Treatment Science & Technology Development Co Ltd Dalian
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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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Abstract

Process for regenerating, recovering and utilizing low-concentration organic effluent is carried out by biological oxidation treating for low-concentration organic effluent, entering it into tilted-plate settling tank, adding flocculating agent into inlet pipe of tilted-plate settling tank, depositing while separating out supernatant fluid, two-stage filtering by fibrous filter and quartz sand filter, filtering by security filter, passing into high-pressure pump, entering into reverse osmose filter and separating. It's cheap, stable and convenient, COD removing rate reaches 96%, ammonia-nitrogen removing rate reaches 99%.

Description

Process for regenerating, recovering and reutilizing low-concentration organic waste water
Technical field
The present invention relates to process for regenerating, recovering and reutilizing low-concentration organic waste water, belong to the advanced treatment of wastewater technical field.
Background technology
Along with the developing rapidly of the surge of world population, industrial and agricultural production, quickening of urbanization process; and natural waters such as river, river, lake pollute serious day by day; available fresh water amount reduces gradually; the water resources imbalance between supply and demand is outstanding day by day, it is predicted that the 21 century water resources crisis will be positioned at first of the various crises in the world.Therefore, people have turned one's attention to municipal effluent and trade effluent.At present, enter natural water after the processing of this dirt (giving up) water process is up to standard, minority is not handled, and then directly enters natural water, has not only increased the weight of water pollution, but also has wasted a large amount of Freshwater resources.This phenomenon and world today's Freshwater resources are in short supply to have formed great contrast.This in fact sewage, especially secondary standard water outlet in municipal sewage plant's can get nearby, water conditioning, quantity are big, easily collecting, easily in manipulation of regeneration, water outlet after the manipulation of regeneration can be used as the low-quality water except that tap water, or after multistage advanced treatment as water quality requirement higher industrial circulating cooling water or boiler feed water, even tap water.A large amount of thus municipal effluents and processing trade effluent up to standard have become second water source in city.
For low-concentration organic waste water is carried out advanced treatment, at present, the technology of using has both at home and abroad: 1. direct filtration recycle method.Promptly add flocculation agent and stir coagulation in low-concentration organic waste water, chlorination is again through the fiber ball filter direct filtration then, and water outlet is only as reclaimed water and pesticide irrigation-ing water; 2. adopt biological treatment and membrane technique method: as passing through BAF, fiber filter, charcoal absorption, micro-filtration and reverse osmosis process.Its biological treatment part can effectively be removed big suspended substance and larger molecular organics in the sewage, and the small particle in the water is further removed in filtration and absorption, and the water after micro-filtration and reverse-osmosis treated can be used as the make up water of industrial circulating cooling water system again.But, need the pre-treatment of micro-filtration, so whole process flow is long, the working cost height as reverse osmosis because traditional biochemical treatment effluent quality does not reach reverse osmosis process water inlet requirement; 3. adopt two embrane methods, i.e. mechanical stirring, double filtering filtration, ultrafiltration, reverse-osmosis treated, it produces water supply boiler of power plant make up water.The two embrane methods of this process using, its technological core is ultrafiltration and reverse osmosis, and ultrafiltration is compared with traditional mechanical filter, and its advantage is that effluent quality is good, floor space is little, level of automation is high.But, there is certain difficulty aspect selection, the use because of kind, material, the complete processing difference of ultra-filtration membrane.Impurity in the sewage, colloid etc. can cause fenestra very fast blocked at the ultra-filtration membrane surface enrichment simultaneously, and water rate and effluent quality are descended, increase the burden of reverse osmosis membrane, therefore, before ultra-filtration membrane, also should increase by a cover pretreatment unit, thereby processing cost is risen.These are deficiencies of two embrane methods, should cause user's attention.
Summary of the invention
Purpose of the present invention and task will overcome prior art and exist: 1. investment cost height; 2. technical process is long; 3. effluent quality is on the low side; 4. can not be with the pollution substance in the low-concentration organic waste water (COD, BOD 5, SS, petroleum-type), solvability inorganics (ammonia nitrogen, NO - 3-N) and the deficiency further removed of pathogenic micro-organism.And provide a kind of and can reach industrial colling or boiler water-filling water quality requirement, its water-quality ratio reclaimed water, landscape water and pesticide irrigation-ing water water quality are good, and flow process is simple, be convenient to the wastewater regenerating and recycling technology and the technology of operating and managing, specially propose process for regenerating, recovering and reutilizing low-concentration organic waste water technical solution of the present invention.
Process for regenerating, recovering and reutilizing low-concentration organic waste water proposed by the invention comprises: biochemical process, physico-chemical process and embrane method is characterized in that:
A) low-concentration organic waste water enters the combined bio oxidizing tower that filler is housed after water collecting basin is reconciled, and carries out aerobic reaction one and holds concurrently after the internal recycle of oxygen reaction handles, and enters inclined-plate clarifying basin;
B) waste water after the biochemical treatment enters fiber bundle filter through the inclined-plate clarifying basin post precipitation, and after unprecipitated flco interception was filtered, the waste water that only contains trickle flco or pollutent entered the quartz sand filtration pond;
C) processing step is:
The first step, low-concentration organic waste water is after water collecting basin is reconciled, enter the combined bio oxidizing tower, under the effect of aeration, rely on the internal recycle water conservancy diversion urceolus and the internal recycle water conservancy diversion inner core of combined bio oxidizing tower to carry out the internal recycle that aerobic reaction one is held concurrently the oxygen reaction, form gas, water, filler three-phase fluidized bed; In inner cyclic process, prismatic wetting ability soft-filler in organic matter in the waste water, nitride and the tower contacts with the microorganism in the elastic filler, carry out the three-phase material exchange of microorganism, waste water, gas phase, the interior microorganism of microbial film that utilization is attached on the carrier is oxidized to organic substance small-molecule substance or is completely oxidized to carbonic acid gas and water, makes waste water obtain to purify;
Second step is to adding content at 20 gram/m by the combined bio oxidizing tower to the water inlet pipe of inclined-plate clarifying basin 3～100 gram/m 3Between flocculation agent, under the water turbulence effect, waste water is removed proportion through mixing, after the flocculation, entering inclined-plate clarifying basin greater than 1 flco precipitation, water body is further purified;
The 3rd step behind turbidity of wastewater≤20NTU, entered fiber bundle filter, and after unprecipitated flco interception was filtered, the waste water that only contains trickle flco or pollutent entered the quartz sand filtration pond, and waste water is carried out further filtration, purification;
In the 4th step, the water outlet of quartz sand filtration pond is pumped to security personnel's strainer through clean water basin, and delivery turbidity satisfies＜1NTU, SDI 15After≤5, by the high-tension boost pump waste water is pumped into reverse osmosis unit, its effluent reuse is in industrial circulating cooling water or boiler feedwater; Its dense water is as the low-quality water; Reverse osmosis unit is that 17: 8～8: 4 reverse osmosis membrane assembly is formed by high desalination rate, antipollution arrangement mode.
Of the present invention being further characterized in that:
Filler in the combined bio oxidizing tower is prismatic, and its volume is 1 * 1 * 1cm 3, hydrophilic soft-filler is 3: 4～5: 6 with the quantity ratio of elastic filler;
The internal recycle of combined bio oxidizing tower the steps include: the waste water that goes out through the even cloth of water distributor, drives the filler and the mud that fall to the bottom, settling region, enters circulation passage, enters aerobic reactor zone subsequently; Air enters the disc type aeration tube by the inlet pipe that is arranged at the aerobic reactor zone bottom, by aeration head with the even cloth of bubble to aerobic reaction zone, for the metabolism of microorganism provides dissolved oxygen, and play mixing stirring action, and provide circulation power for aerobic reactor zone and double oxygen reaction interval internal recycle to water, filler; In aerobic reactor zone and anaerobic reaction district, under the guide functions of internal recycle water conservancy diversion urceolus and internal recycle water conservancy diversion inner core, carry out the aerobic reaction one double oxygen reaction internal recycle of gas, water, filler three-phase fluidized bed, in inner cyclic process, waste water contacts with microbial film on the filler, gas, waste water, microorganism three-phase carry out exchange of substance, utilize microorganism in the microbial film on the filler with the organic substance oxygenolysis, make waste water obtain to purify; Be arranged on the internal recycle water outlet of internal recycle water conservancy diversion urceolus below, make the part water outlet after handling in the oxygen reaction zone of holding concurrently enter the settling region, wherein a part of water relies on water purification pressure to enter filtrating area, carry out further filtration treatment, water after the filtration is distinguished the annular perforations rising pipe of top after filtration and is discharged, filler that proportion is bigger and sludge settling enter circulation passage in the bottom, settling region under the water inlet impulse force drives, proceed internal recycle; Combined bio oxidizing tower bottom is provided with evacuated tube, is provided with filter screen in it, and the carrier that can dam is discharged big, the active relatively poor excess sludge of proportion, is transported to the sludge landfill landfill; The tail gas that produces in the combined bio oxidizing tower is discharged through venting port; Water outlet enters inclined-plate clarifying basin in the combined bio oxidizing tower;
The filtrate loadings of fiber bundle filter is 2/3～4/5 of a strainer useful volume, and its filtrate is that a kind of self-adaptation filtrate is the wetting ability synthetic fiber filter material, the filtering accuracy height, and holding filth capacity is big, is 15～35kg/m 3, be more than 4 times of normal sands filter tank; Filtration velocity is 40m/h～60m/h, is more than 3 times of normal sands filter tank; Used flocculation agent has Tai-Ace S 150 and polyaluminium sulfate (PAC).
The water outlet of using process for regenerating, recovering and reutilizing low-concentration organic waste water proposed by the invention to handle can be back to industrial circulating cooling water system.
The low-concentration organic waste water that the present invention talked refers to: municipal sewage plant's secondary standard water outlet (hereinafter to be referred as the secondary standard water outlet) and industrial enterprise handle the low-concentration organic waste water of qualified discharge.
As treatment capacity≤600m 3/ h, the influent turbidity of fiber bundle filter is similar to 20NTU, the SDI of quartz sand filtration pond water outlet 15=5 o'clock, the value scope capping of each parameter was good, and customer requirements is satisfied in system's water outlet; As treatment capacity≤150m 3/ h, the influent turbidity of fiber bundle filter about 15NTU, the SDI of quartz sand filtration pond water outlet 15Between 4～5, the value scope of each parameter is taken off in limited time, and system's water outlet can reach design requirements; When treatment capacity at 150m 3/ h～600m 3/ h, the influent turbidity of fiber bundle filter between 15～20NTU, the SDI of quartz sand filtration pond water outlet 15＜5 o'clock, the value scope of each parameter was got intermediate value for well, and the every index of system's water outlet reaches water supply standard.
Adopt technique scheme, the effect that the present invention obtained is: 1. under the situation of same scale, same treatment effect, the combined bio oxidizing tower reduces 30% than activated sludge tank floor space in the conventional activated sludge process, has reduced floor space; 2. since the combined bio oxidizing tower in filler adheres a large amount of highly active microorganisms, process to the absorption of pollutants in sewage matter, decomposition, digestion, absorption is fast, cause excess sludge production low, in the combined bio oxidizing tower the surplus sludge volume that produces only for activated sludge process 25%～30%; Also cause simultaneously and handle load raising 10%～15%, BOD 5Load is up to 3～8kg BOD 5/ m 3H can save Biological Oxidation Tower space 25%～30%; 3. fast, the easily backwash of the filtration velocity of fiber bundle filter, equipment volume are little, fibrous bundle physical strength height, long service life, ton water cost are low; 4. because the pre-treatment effect reaches design requirements, and operation is more steady, so reverse osmosis unit is stable, pure water productive rate height is more than 75%, running cost and maintenance cost are low.
The subordinate list explanation
Subordinate list 1 is the treatment effect of embodiment 1 handled municipal sewage plant's secondary standard water outlet process for regenerating, recovering and reutilizing
This tabular has gone out four leading indicator: COD, ammonia nitrogen, the BOD of customer requirements 5, turbidity, listed file names with the measured value of secondary standard water outlet, the measured value of regeneration treatment system water outlet, GB/T19923-2005 " the urban sewage reutilization process water water quality " national normal value of industrial circulating cooling water and the clearance of pollutent.By table 1 as seen, the treatment effect of this secondary standard water outlet regeneration treatment system is good, and the clearance of four indices is respectively: COD is 97.2%, ammonia nitrogen is 99.6%, BOD 5Be 98.9%, turbidity is 100%.System's water outlet has reached user's requirement.
Subordinate list 2 is embodiment 2 handled petrochemical industry low-concentration organic waste water advanced treatment effects
This tabular has gone out four leading indicator: COD, ammonia nitrogen, petroleum-type, the turbidity of customer requirements, has listed file names with the measured value of petrochemical industry low-concentration organic waste water, the measured value of regeneration treatment system water outlet, GB/T19923-2005 " the urban sewage reutilization process water water quality " national normal value of industrial circulating cooling water and the clearance of pollutent.By table 2 as seen, the treatment effect of this regeneration treatment system is good, and the clearance of four indices is respectively: COD is 98.6%, ammonia nitrogen is 99.2%, petroleum-type is 98.2%, turbidity is 100%.System's water outlet has reached user's requirement.
Subordinate list 3 is treatment effects that embodiment 3 handled municipal sewage plant secondary standard water outlets are reclaimed and reused in the chemical plant
This tabular has gone out four leading indicator: COD, ammonia nitrogen, the BOD of customer requirements 5, turbidity, listed file names with the measured value of secondary standard water outlet, the measured value of regeneration treatment system water outlet, GB/T19923-2005 " the urban sewage reutilization process water water quality " national normal value of industrial circulating cooling water and the clearance of pollutent.As shown in Table 3, the treatment effect of this secondary standard water outlet regeneration treatment system is good, and the clearance of four indices is respectively: COD is 98.4%, ammonia nitrogen is 99.6%, BOD 5Be 99.4%, turbidity is 100%.The system for regenerating and recycling water outlet has reached user's requirement.
Description of drawings
Fig. 1 process for regenerating, recovering and reutilizing low-concentration organic waste water schematic flow sheet
This figure has indicated process for regenerating, recovering and reutilizing low-concentration organic waste water of the present invention and has mainly been finished by 9 complete equipments, device combination, and they are: collecting-tank, combination type biologic oxidation tower, dispensing canister, inclined-plate clarifying basin, fiber bundle filter, quartz sand filter tank, clear water reserviors, cartridge filter, reverse osmosis unit; Be connected with pump by pipeline, valve between the unit; Low-concentration organic waste water is pumped into combination type biologic oxidation tower through pump and is carried out interior circulation by sewage disposal plant effluent pipe input set pond, the oxidized decomposition of the organic matter in the waste water; Waste water after the oxidation is before entering inclined-plate clarifying basin, by drug feeding pipeline the flocculant in the dispensing canister is joined in the pipeline between combination type biologic oxidation tower and the inclined-plate clarifying basin, carry out coagulation, absorption, and make tiny flco be condensed into the bulk flco, then enter inclined-plate clarifying basin and carry out sedimentation separation; The mud that sedimentation separation produces is transported to the landfill yard landfill, upper strata waste water enters fiber bundle filter through pipeline, suspension in the waste water more than 95% is tackled by fibre bundle, and the impurity such as larger molecular organics, virus, colloid, iron there is the removal effect, its water outlet enters quartz sand filter tank through pipeline again and carries out secondary filter, makes the SDI of waste water15＜5; Clear water behind the cascade filtration enters clear water reserviors, clear water pumps into cartridge filter by pump in the pond, and with the particle filtering of particle diameter＞5 μ m, then clear water pumps into reverse osmosis unit through high-pressure pump and refilters, user's reclaiming system is delivered in its water outlet, the dense water that produces as the low-quality water; Reverse osmosis membrane in the reverse osmosis unit is a kind of pellicle, membrane aperture is very small, only be about 1nm, under the effect that is higher than solution osmotic pressure, hydrone can see through, other material can not see through, therefore, can effectively remove dissolved salts in the water, colloid, microorganism, organic matter etc., its clearance is up to 97%～99%, have that system's effluent quality is good, energy consumption is low, pollution-free, advantage that technique is simple, easy and simple to handle, the direction of arrow is the current direction of pipeline.
Process flow diagram in Fig. 2 combination type biologic oxidation tower
This chart understands the interior circulation technology flow process in the combination type biologic oxidation tower, low-concentration organic waste water (secondary standard water outlet), at first enter the aerobic reactor zone bottom that is positioned at inner draft tube by pipe in the multiple tube by cat head, simultaneously, air also enters the aerobic zone bottom from the top via the outer tube of multiple tube and carries out aeration, in inner draft tube, form aerobic zone, the fritter filler of prism-shaped is housed as bio-carrier, form gas, water, filler three phase fluidized bed at this, larger molecular organics in its waste water is tackled by bio-carrier, and the generation biooxidation reactions, become small-molecule substance or permineralization to become carbon dioxide and water macromolecular organic substance decomposing; In aerobic reactor zone, gas, water, filler constantly rise in three phase fluidized bed, collide, roll, and edge on inner draft tube flows into the aerobic area between inner draft tube and the external flow guiding cylinder downwards, make nitride thoroughly be converted into innocuous substance at this, thus the nitration reaction of finishing; After the nitration reaction, with water (flow) direction, a part is returned the aerobic zone bottom again, a part enters the settling zone by external flow guiding cylinder outlet water at tail end mouth, and upper flowing water enters filter course, filters water outlet and is discharged by the annular collector pipe of top of tower, then, this part water outlet is just flowed out tower and is entered inclined-plate clarifying basin outward; And the mud that produces of precipitation and filler flow downward that deflection plate turns back to the aerobic zone bottom at the bottom of the tower, again participate in biooxidation reactions; Another part mud since Action of Gravity Field by tower at the bottom of evacuation port discharge, be transported to the sludge landfill landfill; Tail gas in the course of reaction is from the top vent discharging of tower, and the water outlet in combination type biologic oxidation tower enters inclined-plate clarifying basin.
Embodiment
Embodiment one
Certain 600m of city sewage work 3The water outlet of/h secondary standard is reclaimed and reused in heat power plant
Employing the inventive method is handled, and its process is as follows:
The first step, influent quality, national standard and clearance
The secondary standard effluent quality requires to be COD≤100mg/L, BOD 5≤ 30mg/L, ammonia nitrogen≤25mg/L, turbidity (no requirement (NR)) (GB 18918-2002).Processing requirement influent quality of the present invention is controlled in this standard.The required water water quality of user should satisfy GB/T19923-2005 standard: COD≤50mg/L, BOD 5≤ 10mg/L, turbidity≤3NTU, ammonia nitrogen≤10mg/L (when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should less than 1mg/L).
The second step treating processes:
A) secondary standard water outlet in municipal sewage plant's at first enters the aerobic zone of combined bio oxidizing tower through water collecting basin, relies on the guide shell of reactor to do the internal recycle reaction under the effect of aeration.Simultaneously, the organic matter in the sewage, nitride are by filler interception in the tower, and the microbiological degradation that is attached on filler becomes small-molecule substance or permineralization to become carbonic acid gas and water; The wetting ability of packing in tower soft-filler and elastic filler, filler are suspended state when operation; The volume ratio of wetting ability soft-filler and elastic filler is 5: 6 in the tower;
B) in the water inlet pipe of inclined-plate clarifying basin, add polymerize aluminum chloride (PAC), carry out coagulation, absorption, in inclined-plate clarifying basin, precipitate, to reduce chemical oxygen demand and the ammonia-nitrogen content in the sewage; The add-on of polymerize aluminum chloride is 100 gram/m 3The sewage that adds polymerize aluminum chloride carries out solid-liquid separation in inclined-plate clarifying basin, supernatant liquid further with interceptions such as tiny suspended substance, colloidal particles, makes delivery turbidity＜1NTU, SDI through fiber bundle filter, quartz sand filtration pond 15＜5; Wherein the loadings of filtrate is 4/5 of a strainer useful volume in the fiber bundle filter;
C) water outlet of quartz sand filtration pond enters clean water basin, pumps into reverse osmosis unit through security personnel's strainer again, and the arrangement mode of membrane module is 17: 8 in wherein every cover reverse osmosis unit; Its water outlet (product water) enters heat power plant's industrial circulating cooling water system and uses, and the dense water that is produced is as heat power plant's flushing cinder water;
The 3rd step inspected for acceptance
After handling through technique scheme, the average purification efficiency of sewage, wherein COD is 97.2%, ammonia nitrogen is 99.6%, BOD 5Be 98.9%, turbidity is 100%, sees table 1 for details.
Embodiment two
Certain petrochemical plant 150m 3The regeneration of/h petrochemical industry low concentration wastewater is handled
The first step, influent quality, national standard and clearance
Petrochemical plant effluent treatment plant effluent quality requires to be COD≤100mg/L, ammonia nitrogen≤25mg/L, petroleum-type≤5mg/L, turbidity (no requirement (NR)) (GB 18918-2002).Processing requirement influent quality of the present invention is controlled in this standard; The required water water quality of user should satisfy GB/T19923-2005 standard: COD≤50mg/L, BOD 5≤ 10mg/L, turbidity≤3NTU, ammonia nitrogen≤10mg/L (when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should less than 1mg/L);
The second step treating processes
A) at first the water outlet up to standard of petrochemical plant purification of waste water workshop is pumped into the combined bio oxidizing tower, the organic matter in the water, nitride etc. are decomposed by microbiological oxidation; The volume ratio of wetting ability soft-filler and elastic filler is 3: 4 in the tower;
B) waste water after handling through bio-oxidation adds Tai-Ace S 150, carries out coagulation, absorption, precipitation, decolouring, degerming, removes microorganism and algae.The SDI of follow-up quartz sand filtration pond water outlet 15＜5, add Tai-Ace S 150 20 gram/m 3
C) sewage of adding Tai-Ace S 150 enters the inclined-plate clarifying basin precipitation, and supernatant liquid further with interceptions such as tiny suspended substance, colloidal particles, makes delivery turbidity＜1NTU, SDI through fiber bundle filter, quartz sand filtration pond 15＜5; Wherein the loadings of filtrate is 2/3 of a strainer useful volume in the fabric filter;
D) water outlet of quartz sand filtration pond enters clean water basin, pumps into reverse osmosis unit through security personnel's strainer again, and the arrangement mode of membrane module is 8: 4 in wherein every cover reverse osmosis unit; Its water outlet (product water) is as the moisturizing of " center circulation water factory " in a water moisturizing in the factory and the factory.The dense water that comes out from this device is used as the mill floor wash-down water and the water of flushing the toilet;
The 3rd step inspected for acceptance
After handling through technique scheme, the average purification efficiency of sewage, wherein COD is 98.6%, ammonia nitrogen is 99.2%, petroleum-type is 98.2%, turbidity is 100%, sees table 2 for details.
Embodiment three
Certain 400m of city sewage work 3The water outlet of/h secondary standard is reclaimed and reused in the chemical plant
Employing the inventive method is handled, and its process is as follows:
The first step, influent quality, national standard and clearance
The secondary standard effluent quality requires to be COD≤100mg/L, BOD 5≤ 30mg/L, ammonia nitrogen≤25mg/L, turbidity (no requirement (NR)) (GB 18918-2002).Processing requirement influent quality of the present invention is controlled in this standard.The required water water quality of user should satisfy GB/T19923-2005 standard: COD≤50mg/L, BOD 5≤ 10mg/L, turbidity≤3NTU, ammonia nitrogen≤10mg/L (when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should less than 1mg/L);
The second step treating processes
A) secondary standard water outlet in municipal sewage plant's at first enters the aerobic zone of combined bio oxidizing tower through water collecting basin, relies on the guide shell of reactor to do the internal recycle reaction under the effect of aeration.Simultaneously, the organic matter in the sewage, nitride are by filler interception in the tower, and the microbiological degradation that is attached on filler becomes small-molecule substance or permineralization to become carbonic acid gas and water; The wetting ability of packing in tower soft-filler and elastic filler, filler are suspended state when operation; The volume ratio of wetting ability soft-filler and elastic filler is 4: 5 in the tower;
B) in the water inlet pipe of inclined-plate clarifying basin, add polymerize aluminum chloride (PAC), carry out coagulation, absorption, in inclined-plate clarifying basin, precipitate, to reduce chemical oxygen demand and the ammonia-nitrogen content in the sewage; The add-on of polymerize aluminum chloride (PAC) is 60 gram/m 3The SDI of quartz sand filtration device water outlet 15＜5.The sewage that adds polymerize aluminum chloride carries out solid-liquid separation in inclined-plate clarifying basin, supernatant liquid further with interceptions such as tiny suspended substance, colloidal particles, makes delivery turbidity＜1NTU, SDI through fiber bundle filter, quartz sand filtration pond 15＜5; Wherein the loadings of filtrate is 3/4 of a strainer useful volume in the fiber bundle filter;
C) water outlet of quartz sand filtration pond enters clean water basin, pumps into reverse osmosis unit through security personnel's strainer again, and the arrangement mode of membrane module is 13: 7 in wherein every cover reverse osmosis unit; Its water outlet (product water) enters the chemical plant industrial circulating cooling water system and uses, and the dense water that is produced is as the chemical plant flushing mill floor water and the water of flushing the toilet;
The 3rd step inspected for acceptance
After handling through technique scheme, the average purification efficiency of sewage, wherein COD is 98.4%, ammonia nitrogen is 99.6%, BOD 5Be 99.4%, turbidity is 100%, sees table 3 for details.
Table 1 is embodiment 1 handled municipal sewage plant's secondary standard water outlet regeneration treatment effect
COD(mg/L) Ammonia nitrogen (mg/L) BOD 5(mg/L) Turbidity (NTU)
The secondary standard water outlet 115.2 25.8 30.7 18.6
The system for regenerating and recycling water outlet 3.3 0.1 0.3 0
COD(mg/L) Ammonia nitrogen (mg/L) BOD 5(mg/L) Turbidity (NTU)
The industrial circulating cooling water water quality requirement ≤50 ≤10(1) ≤10 ≤3
Pollutants removal rate (%) 97.2 99.6 98.9 100
Annotate: when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should be less than 1mg/L.
Table 2 is embodiment 2 handled petrochemical industry regenerating, recovering and reutilizing low-concentration organic waste water treatment effects
COD(mg/L) Ammonia nitrogen (mg/L) Petroleum-type (mg/L) Turbidity (NTU)
The water outlet of sewage disposal workshop 102.2 24.5 10.7 20.5
The system for regenerating and recycling water outlet 2.5 0.2 0.2 0
The industrial circulating cooling water water quality requirement ≤50 ≤10(1) ≤10 ≤3
Pollutants removal rate (%) 98.6 99.2 98.2 100
Annotate: when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should be less than 1mg/L.
Table 3 is treatment effects that embodiment 3 handled municipal sewage plant secondary standard water outlets are reclaimed and reused in the chemical plant
COD(mg/L) Ammonia nitrogen (mg/L) BOD 5(mg/L) Turbidity (NTU)
The water outlet of sewage disposal workshop 108.5 25.2 30.5 27.4
The system for regenerating and recycling water outlet 1.8 0.1 0.2 0
The industrial circulating cooling water water quality requirement ≤50 ≤10(1) ≤10 ≤3
Pollutants removal rate (%) 98.4 99.6 99.4 100
Annotate: when recirculating cooling water system interchanger when being copper, the ammonia nitrogen index of recirculated cooling water should be less than 1mg/L.

Claims (5)

1. process for regenerating, recovering and reutilizing low-concentration organic waste water, comprising: biochemical process, physico-chemical process and embrane method is characterized in that:
A) low-concentration organic waste water enters the combined bio oxidizing tower that filler is housed after water collecting basin is reconciled, and carries out the internal recycle of the aerobic reaction-oxygen reaction of holding concurrently and handles, and its water outlet enters inclined-plate clarifying basin;
B) waste water after the biochemical treatment enters fiber bundle filter through the inclined-plate clarifying basin post precipitation, and after unprecipitated flco interception was filtered, the waste water that only contains trickle flco or pollutent entered the quartz sand filtration pond;
C) processing step is:
The first step, low-concentration organic waste water is after water collecting basin is reconciled, enter the combined bio oxidizing tower, under the effect of aeration, rely on the internal recycle water conservancy diversion urceolus and the internal recycle water conservancy diversion inner core of combined bio oxidizing tower to carry out the internal recycle that aerobic reaction-oxygen of holding concurrently reacts, form gas, water, filler three-phase fluidized bed; In inner cyclic process, prismatic wetting ability soft-filler in organic matter in the waste water, nitride and the tower contacts with the microorganism in the elastic filler, carry out the three-phase material exchange of microorganism, waste water, gas phase, the interior microorganism of microbial film that utilization is attached on the carrier is oxidized to organic substance small-molecule substance or is completely oxidized to carbonic acid gas and water, makes waste water obtain to purify;
Second step is to adding content at 20 gram/m by the combined bio oxidizing tower to the water inlet pipe of inclined-plate clarifying basin 3～100 gram/m 3Between flocculation agent, under the water turbulence effect, waste water is removed proportion through mixing, after the flocculation, entering inclined-plate clarifying basin greater than 1 flco precipitation, water body is further purified;
The 3rd step behind turbidity of wastewater≤20NTU, entered fiber bundle filter, and after unprecipitated flco interception was filtered, the waste water that only contains trickle flco or pollutent entered the quartz sand filtration pond, and waste water is carried out further filtration, purification;
In the 4th step, the water outlet of quartz sand filtration pond is pumped to security personnel's strainer through clean water basin, and delivery turbidity satisfies＜1NTU, SDI 15After≤5, by the high-tension boost pump waste water is pumped into reverse osmosis unit, its effluent reuse is in industrial circulating cooling water or boiler feedwater; Its dense water is as the low-quality water; Reverse osmosis unit is that 17: 8～8: 4 reverse osmosis membrane assembly is formed by high desalination rate, antipollution arrangement mode.
2. according to the described process for regenerating, recovering and reutilizing low-concentration organic waste water of claim 1, it is characterized in that: the filler in the combined bio oxidizing tower is that prismatic volume is 1 * 1 * 1cm 3Wetting ability soft with two kinds of fillers of elasticity, its volume ratio is 3: 4～5: 6.
3. process for regenerating, recovering and reutilizing low-concentration organic waste water according to claim 1, it is characterized in that: the processing step in the combined bio oxidizing tower: the waste water that goes out through the even cloth of water distributor, drive falls to the filler and the mud of bottom, settling region, enters circulation passage, enters aerobic reactor zone subsequently; Air enters the disc type aeration tube by the inlet pipe that is arranged at the aerobic reactor zone bottom, by aeration head with the even cloth of bubble to aerobic reaction zone, for the metabolism of microorganism provides dissolved oxygen, and play mixing stirring action, and provide circulation power for aerobic reactor zone and double oxygen reaction interval internal recycle to water, filler; In aerobic reactor zone and anaerobic reaction district, under the guide functions of internal recycle water conservancy diversion urceolus and internal recycle water conservancy diversion inner core, carry out the aerobic reaction-oxygen reaction internal recycle of holding concurrently of gas, water, filler three-phase fluidized bed, in inner cyclic process, waste water contacts with microbial film on the filler, gas, waste water, microorganism three-phase carry out exchange of substance, utilize microorganism in the microbial film on the filler with the organic substance oxygenolysis, make waste water obtain to purify; Be arranged on the internal recycle water outlet of internal recycle water conservancy diversion urceolus below, make the part water outlet after handling in the oxygen reaction zone of holding concurrently enter the settling region, wherein a part of water relies on water purification pressure to enter filtrating area, carry out further filtration treatment, water after the filtration is distinguished the annular perforations rising pipe of top after filtration and is discharged, filler that proportion is bigger and sludge settling enter circulation passage in the bottom, settling region under the water inlet impulse force drives, proceed internal recycle; Combined bio oxidizing tower bottom is provided with evacuated tube, is provided with filter screen in it, and the carrier that can dam is discharged big, the active relatively poor excess sludge of proportion, is transported to the sludge landfill landfill; The tail gas that produces in the combined bio oxidizing tower is discharged through venting port; Water outlet enters inclined-plate clarifying basin in the combined bio oxidizing tower.
4. process for regenerating, recovering and reutilizing low-concentration organic waste water according to claim 1 is characterized in that: the filtrate loadings of fiber bundle filter is 2/3～4/5 of a strainer useful volume; Its filtrate is that a kind of self-adaptation filtrate is the wetting ability synthetic fiber filter material, and the filtering accuracy height reaches more than 95% the clearance of suspended substance in the water, and its holding filth capacity is big simultaneously, is 15～35kg/m 3, be more than 4 times of normal sands filter; Filtration velocity is 40m/h～60m/h, is more than 3 times of normal sands filter.
5. process for regenerating, recovering and reutilizing low-concentration organic waste water according to claim 1 is characterized in that: used flocculation agent has Tai-Ace S 150 or polymerize aluminum chloride.
CN200710011788A 2007-06-20 2007-06-20 Process for regenerating, recovering and reutilizing low-concentration organic waste water Expired - Fee Related CN101074141B (en)

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