CN201842735U - Tanning waste water treatment recycling device based on nano catalytic electrolysis technology and membrane technology - Google Patents
Tanning waste water treatment recycling device based on nano catalytic electrolysis technology and membrane technology Download PDFInfo
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- CN201842735U CN201842735U CN2010205856966U CN201020585696U CN201842735U CN 201842735 U CN201842735 U CN 201842735U CN 2010205856966 U CN2010205856966 U CN 2010205856966U CN 201020585696 U CN201020585696 U CN 201020585696U CN 201842735 U CN201842735 U CN 201842735U
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Abstract
The utility model relates to a tanning waste water treatment recycling device based on the nano catalytic electrolysis technology and the membrane technology, relating to tanning waste water treatment. The utility model provides the tanning waste water treatment recycling device based on the nano catalytic electrolysis technology and the membrane technology, which has the advantages of high COD removing rate, little chemical agent consumption, little generated sludge, thorough treatment and high water recycling rate. The tanning waste water treatment recycling device based on the nano catalytic electrolysis technology and the membrane technology is provided with a coarse grating filter, an adjusting tank, a hydraulic screen, a nano catalytic electrolysis machine, a reaction tank, a setting tank, a floating device, a biochemical tank, a secondary setting tank, a secondary nano catalytic electrolysis machine, a filter and a membrane system. The specific methods comprises nano catalytic electrolysis, flocculation, biochemical treatment, secondary catalytic electrolysis, filtering and membrane filtering.
Description
Technical field
The utility model relates to a kind of leather-making waste water to be handled, and especially relates to a kind of leather-making waste water based on nano-catalytic electrolysis tech and membrane technique and handles reclamation set.
Background technology
According to statistics, China's leather industry reaches more than 10,000 ten thousand t to environmental emission waste water every year, accounts for 0.3% of China's industrial wastewater discharge total amount; Ten thousand yuan of output value blowdown flow rates of leather industry occupy the 3rd at light industry, be only second to papermaking and brewing industry, as seen, a large amount of Freshwater resources of the not only annual consumption of tanning industry, also discharged simultaneously a large amount of waste water, the Sustainable development of human health and entire society has been caused serious threat.Therefore should strengthen the treatment of Tannery Wastewater dynamics, carry out leather-making waste water processing and middle water reuse, have important practical significance and strategic importance from saving the Freshwater resources angle still is to say it all is very necessary from environmental angle.
There is organic pollution concentration height in the waste water of tanning industry discharging, problems such as suspended matter is many, the water yield is big, waste water composition complexity, wherein contains toxic substance sulphur and chromium.According to production process, leather-making industrial wastewater is made up of seven parts: the strong basicity depilation liming waste water of the raw hide washing water of high concentration chloride and acidleach water, limy and sodium sulphite, contain chromic blue look Chrome Tanning Wastewater, contain tannin and gallic acid dark brown vegetable tanning waste water, contain grease and saponified degreasing waste water, stuffing dyeing waste-water and each workshop section's flushing waste water thereof.Wherein, with degreasing waste water, depilation liming waste water, Chrome Tanning Wastewater are polluted the most serious.
(1) degreasing waste water: China's pigskin production accounts for 80% of tanning production, and in the degreasing waste water that pigskin is produced, fat content is up to 10000 (mg/L), CODCr20000 (mg/L).Oil wastewater accounts for total waste water 4%, but the oxygen consumption of oil wastewater load accounts for 30%～40% of total load.
(2) dehydration liming waste water: depilation liming waste water is the source of pollution of sulfide.Waste water COD Cr20000～40000 (mg/L), BOD54000 (mg/L), sodium sulphite 1200～1500 (mg/L), pH are 12, depilation liming waste water accounts for 10% of total waste water, and the oxygen consumption load accounts for total load 40%.
(3) Chrome Tanning Wastewater: Chrome Tanning Wastewater is chromic source of pollution.The chrome tanning process, the adhesive rate 60%～70% of chromic salts promptly has 30%～40% chromic salts to enter waste water.Chrome tanning degree water Cr3+3000-4000 (mg/L), CODCr10000 (mg/L), BOD52000mg/L.
Traditional leather-making waste water treatment technology is that each operation wastewater collection is mixed, and includes Sewage treatment systems together in, but owing to contain a large amount of sulfide and chromium ion in the waste water, very easily to the microorganisms restraining effect.So more reasonably be the operational path [8] of " stoste individual curing, the unified processing of comprehensive wastewater " at present, valuable resource is handled and reclaimed to degreasing waste water, liming hair removal wastewater, Chrome Tanning Wastewater respectively, mix unified the processing then with other waste water.
After each road Waste Water Centralized of tannery, be called organic content and sulfide in the synthetic leather wastewater leather-making waste water, chromium compounds content height, oxygen-consumption is big, and the pollution condition of its waste water is very serious, mainly shows the following aspects:
(1) colourity: leather waste water colourity is bigger, is mainly caused by vegetable tanning, dyeing, chrome tanning and grey alkali wasteliquid;
(2) alkalescence: leather waste water is alkalescence generally, and comprehensive wastewater pH value is between 8～12.Its alkalescence mainly comes from lime, caustic soda and the sodium sulphite that operations such as depilation are used;
(3) sulfide: the sulfide in the leather-making waste water mainly comes from grey alkaline process depilation waste liquor, and small part comes from sulfide and helps soft immersion waste liquid and proteinic degradation production.Sulphur-bearing waste solution is met acid and is easily produced H2S gas, and sulfur-bearing mud under anaerobic also can discharge H2S gas;
(4) chromium ion: the chromium ion in the leather-making waste water mainly exists with the Cr3+ form, and content is generally at 100mg/L～3000mg/L.Normally earlier through neutralization precipitation, filter the back and import in the comprehensive wastewater pond;
(5) organic pollutant: organic content such as protein is higher in the leather-making waste water, contains a certain amount of reducing substances again, so BOD5 and CODCr are very high.
The waste water quality of each workshop section's discharging differs greatly in the process hides process, comprehensive wastewater pH after the waste water of each workshop section's discharging compiles is between 8～12, colourity, CODCr, SS, BOD5 concentration are all very high, the concentration of poisonous, objectionable impurities and salt is also very high, and leather industry comprehensive wastewater water quality (testing mean) is referring to table 1.
Table 1
| pH | Colourity (doubly) | CODCr | SS | NH 3-N | S 2- | Cr | BOD5 |
| ?8～12 | 500～3500 | 3000～4000 | 2000～4000 | 250～300 | 50～100 | ?100～3000 | 1500～2000 |
Annotate: all the other are mg/L except that pH, colourity in unit
At present, be used for the method that leather-making waste water administers and mainly contain: coagulant sedimentation, absorption method, high-level oxidation technology, directly loop back usage, air supporting method, add sour absorption process, catalytic oxidation, biochemical process etc., every kind of method all has various relative merits.Because single treatment process is difficult to be effective, in practice, normally, several method is used in combination according to the practical situation that will handle waste water.Huang Zhenxiong has introduced Guangdong tannery and has adopted flocculation sediment-activated sludge process-contact oxidation method combination process to handle leather-making waste water, from in December, 2003 treatment effect of going into operation so far stable, when water inlet COD is 3000～3500mg/L, the about 40mg/L of water outlet COD, every effluent index all reaches Guangdong Province's provincial standard (DB44/26-2001) primary standard.Application sequencing batch active sludges (SBR) such as Zhang Jie are handled the waste water of Henan tannery.At first adopt physico-chemical process to remove a large amount of toxic substances and partial organic substances in the waste water, pass through SBR method biochemical degradation dissolved organic matter again.The design day output is 800m3, and as water inlet COD during at 2500mg/L, water outlet COD is about 100mg/L, and (COD＜300mg/L), the running cost of this project is 0.8 yuan/ton far below the GB secondary standard.Operation result shows that with SBR art breading leather-making waste water, good to the adaptability of change of water quality, the resistance to overload shock ability is strong, especially is fit to leather-making waste water and concentrates discharging and the changeable characteristics of water quality relatively.And the investment of SBR treatment process economizes, and the general activated sludge process of running cost is low.Jia Qiupings etc. adopt cavitation air flotation+two section contact oxidation technology, and the waste water disposal facility of Shenyang City tannery is transformed, and not only make the waste water after the processing reach emission request, have improved processing power and effect, and have reclaimed the Cr more than 80%
3+, make the waste water part reuse after the processing.When water inlet COD 3647mg/L, after this art breading, effluent COD concentration is 77mg/L, is lower than Liaoning Province " DB21-60-89 " new extension secondary standard (COD＜100mg/L).Yang Jianjun, Gao Zhongbai have introduced Xinji City examination big gun battalion process hides sub-district and have adopted materialization+oxidation ditch process, original jet-flow aeration Sewage treatment systems is transformed and increase-volume, the improved processing water yield increases to 4800m3/d, can be that waste water about 6100mg/L is effectively handled to water inlet COD.Actual motion shows that the processing efficiency of this reforming technology is higher, and effluent quality reaches country's " integrated wastewater discharge standard " secondary standard.Tao Rujun has introduced tanning industry district, Zhejiang and has adopted coagulating sedimentation+acidication+CAST technology, handles coming from preparation, tanning and other wet comprehensive wastewater of processing workshop section.Design maximum flooding velocity 6000m3/d, the sulfonium ion in the waste water is by preaeration, and adds FeSO at reaction tank
4With coagulant aids PAC, thereby precipitation is removed Cr
3+Remove by in reaction tank, precipitin reaction taking place with NaOH.Hold concurrently oxygen and aerobic process combined are adopted in biochemical treatment, and the oxygen of holding concurrently adopts contact acidication technology, can improve the biodegradability of waste water, remove portion C OD and SS simultaneously.Aerobic employing CAST technology is the SBR technology of improvement, has characteristics such as organic removal rate height, capacity of resisting impact load are strong.People such as Sun Yabing disclose a kind of method that adopts the electrolysis treatment leather-making waste water at Chinese patent CN100371268C, waste water COD clearance after the processing reaches 60%～80%, ammonia nitrogen removal frank reaches 50%～70%, the sulfide clearance reaches more than 95%, the suspended substance removal rate reaches 70%～80%, chroma removal rate reaches more than 85%, colibacillary eradicative rate is reached more than 99%, but, this method exists the anode consumption amount many, the energy consumption height.
In sum; not only there is high material consumption in existing method; sludge discharge is big; all do not reach water reuse standard in the trade effluent after the wastewater treatment; discharge of wastewater is many; water resource waste is big; the cost height; and complicated operation; bring secondary pollution easily; a series of problems such as be difficult to apply; so it is few to be badly in need of a kind of raw materials consumption; sludge discharge is little; water reuse and cost were low during waste water can carry out after treatment; the easy new method of wastewater treatment of operation; be beneficial to reduce the unit product supplies consumption in the leather production, save Freshwater resources, the protection environment.
Summary of the invention
The purpose of this utility model be at existing leather-making waste water have that chemical consumption is many, sludge discharge is big, do not reach the industrial effluent reusing standard after the wastewater treatment, discharge of wastewater is many, water resource waste is big, cost is high, complicated operation and bring shortcoming such as secondary pollution easily, provide a kind of COD clearance height, chemical consumption few, produce mud few, handle relatively thoroughly, leather-making waste water processing reclamation set that the water reclamation rate is high based on nano-catalytic electrolysis tech and membrane technique.
Leather-making waste water described in the utility model is meant the composite waste that compiles each workshop section's discharging, is called comprehensive wastewater.
The utility model is provided with coarse rack filter, equalizing tank, hydraulic screen, nano-catalytic electrolysis machine, reaction tank, settling tank, air-floating apparatus, biochemistry pool, second pond, secondary nano-catalytic electrolysis machine, strainer and film system.The external comprehensive wastewater of the waterwater entrance of coarse rack filter source, the filtered wastewater outlet of coarse rack filter connects the inlet of equalizing tank, the inlet of hydraulic screen connects the wastewater outlet of equalizing tank, the inlet of nano-catalytic electrolysis machine connects the outlet of hydraulic screen, the outlet of nano-catalytic electrolysis machine connects the inlet of reaction tank, the outlet of reaction tank connects the inlet of settling tank, the precipitation outlet of settling tank is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, the wastewater outlet of settling tank connects the inlet of air-floating apparatus, the slag outlet on air-floating apparatus top is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, the filtrate outlet of filter flows in the biochemistry pool through pipeline, the wastewater outlet of air-floating apparatus bottom connects biochemistry pool through pump, the outlet of biochemistry pool connects the inlet of second pond, wastewater outlet connects the inlet of secondary nano-catalytic electrolysis machine after the biochemical treatment on second pond top, the precipitation outlet of second pond bottom is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, filtrate flows in the second pond through pipeline, the wastewater outlet of secondary nano-catalytic electrolysis machine is taken over the inlet of filter, the filtration gained wastewater outlet of strainer connects the film system entry, and the film system is provided with dialyzate (reuse water) outlet and concentrated solution discharge outlet.
Described strainer can adopt sand-bed filter, more medium filter or microfiltration membrane system etc.
Described film system can be nanofiltration membrane system or reverse osmosis membrane system etc., and the membrane module in the described nanofiltration membrane system is a rolled membrane module, and the mould material of nanofiltration membrane is cellulose acetate film or a composite nanometer filtering film etc. in the organic membrane, and its molecular weight cut-off can be 200～500MWCO.
The membrane module of described reverse osmosis membrane system can be rolled membrane module, and mould material can be cellulose acetate film or composite membrane etc. in the organic membrane, and its molecular weight cut-off can be 50～200MWCO.
The utility model is in the wastewater treatment of composition, character and the existing processing scheme of existing leather-making waste water being goed deep into finish after the comparative study of system and the design of purification and reuse technology.
The equipment that is adopted with flocculation+biochemical method compares, and the utlity model has following outstanding advantage:
1) a large amount of consumptions that reduce flocculation dosage reduce the consumption of unit product chemical agent and save reagent cost;
2) reduce the quantity discharged of mud in a large number, reduce the sludge treatment cost;
3) waste water is through handling, and 60%～85% can regeneration, has both reduced discharge of wastewater, avoids the waste water environmental pollution, reduces water resource waste again, can also produce certain economic benefits.
Compare with the equipment that flocculation+biochemistry+membrane filtering method adopted, the utlity model has following outstanding advantage:
1) a large amount of consumptions that reduce flocculation dosage reduce the consumption of unit product chemical agent and save reagent cost;
2) reduce the quantity discharged of mud in a large number, reduce the sludge treatment cost;
3) biochemical waste water of second pond further reduces COD through the electrolysis of secondary nano-catalytic, and the one, the reclamation rate of waste water is improved, both reduced discharge of wastewater, avoid the waste water environmental pollution, reduce water resource waste again; The 2nd, can kill the microorganisms such as bacterium in the waste water, eradicate the biological pollution of film, reduce the wash number of film significantly, reduce film cleaning regeneration cost, improve the service efficiency of film, prolong the work-ing life of film, reduce the film replacement cost;
4) reduce the total release of waste water COD significantly.
Description of drawings
Fig. 1 is the composition synoptic diagram of the utility model embodiment.
Embodiment
Following examples will be further described the utility model in conjunction with the accompanying drawings.
Referring to Fig. 1, the utility model embodiment is provided with coarse rack filter 1, equalizing tank 2, hydraulic screen 3, nano-catalytic electrolysis machine 4, reaction tank 5, settling tank 6, air-floating apparatus 7, biochemistry pool 8, second pond 9, secondary nano-catalytic electrolysis machine 10, strainer 11 and film system 12.The external comprehensive wastewater of the waterwater entrance of coarse rack filter 1 source, the filtered wastewater outlet of coarse rack filter 1 connects the inlet of equalizing tank 2, the inlet of hydraulic screen 3 connects the wastewater outlet of equalizing tank 2, the inlet of nano-catalytic electrolysis machine 4 connects the outlet of hydraulic screen 3, the outlet of nano-catalytic electrolysis machine 4 connects the inlet of reaction tank 5, the outlet of reaction tank 5 connects the inlet of settling tank 6, the precipitation outlet of settling tank 6 is pumped via pipes into pressure filter P filtering separation and becomes filtrate and mud, the wastewater outlet of settling tank 6 connects the inlet of air-floating apparatus 7, the slag outlet on air-floating apparatus 7 tops is pumped via pipes into pressure filter P filtering separation and becomes filtrate and mud, the filtrate outlet of filter flows in the biochemistry pool 8 through pipeline, the wastewater outlet of air-floating apparatus 7 bottoms connects biochemistry pool 8 through pump, the outlet of biochemistry pool 8 connects the inlet of second pond 9, wastewater outlet connects the inlet of secondary nano-catalytic electrolysis machine 10 after the biochemical treatment on second pond 9 tops, the precipitation outlet of second pond 9 bottoms is pumped via pipes into pressure filter P filtering separation and becomes filtrate and mud, filtrate flows in the second pond 9 through pipeline, the wastewater outlet of secondary nano-catalytic electrolysis machine 10 is taken over the inlet of filter 11, the filtration gained wastewater outlet of strainer 11 connects film system 12 inlets, and film system 12 is provided with dialyzate (reuse water) outlet H and concentrated solution discharge outlet M.
Below provide and adopt the utility model embodiment to carry out handling the specific embodiment of recycling method based on the leather-making waste water of nano-catalytic electrolysis tech and membrane technique.
The electrolysis of step 1 nano-catalytic
Leather-making waste water enters and flows into equalizing tank 2 mixing after coarse rack filter 1 removes by filter the macrobead solids, the waste water pump of equalizing tank 2 being gone into hydraulic screen 3 filters depilation and sends out and flow into 4 electrolysis of nano-catalytic electrolysis machine after waiting impurity again, electrolytic operating voltage is 2～500V, two interpolar voltages are 2～8V, and electrolysis density is 10～300mA/cm
2The catalytic electrolysis machine, keeping the residence time of waste water in the nano-catalytic electrolysis machine is 5～15min, the electrolytic power consumption of waste water is controlled to be 0.8～1.2 degree/m
3
Flow in the reaction tank 5 through the waste water after step 1 nano-catalytic electrolysis machine 4 electrolysis treatment, in reaction tank 5, add flocculation agent, coagulant aids and the gas floatation agent that has prepared, carry out entering settling tank 6 after the flocculation reaction and separate.Settling tank 6 bottoms precipitation is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud; Settling tank 6 top waste water flow into air-floating apparatus 7 and carry out dissolved air flotation, and the isolating slag in air-floating apparatus 7 tops is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the biochemistry pool 8 through pipeline; The waste water of air-floating apparatus 7 bottoms pumps in the biochemistry pool 8.
To pump in the biochemistry pool 8 through the waste water of air-floating apparatus 7 bottoms of step 2 flocculation, handle through aerobic or anaerobism+aerobic a kind of method, again through second pond 9 precipitate and separate, waste water after the outflow biochemical treatment of second pond 9 tops, the precipitation of second pond 9 bottoms is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the second pond 9 through pipeline.Through biochemical treatment, be 60～200 from the colourity of second pond precipitate and separate gained biochemical treatment waste water, COD is 80～300mg/L, ammonia nitrogen is 0～30mg/L.
The electrolysis of step 4 quadric catalysis
The effusive biochemical treatment waste water in second pond 9 tops is sent into 10 electrolysis of secondary nano-catalytic electrolysis machine, electrolytic operating voltage is 2～400V, and optimum operating voltage is 13～200V, and two interpolar voltages are 2～8V, two interpolar optimum voltages are 3～5V, and current density is 10～300mA/cm
2, optimum current density is 150～230mA/cm
2, the residence time of waste water in electrolysis machine is 2～6min, and most optimal retention time is 3～4min, and the electrolysis degree is 0.8～1.0 degree/m
3
Quadric catalysis electrolysis machine 10 electromechanics are separated gained waste water filter, remove solid impurity through filter 11.
Described strainer 11 is a kind of of sand-bed filter, more medium filter or microfiltration membrane system.Quadric catalysis electrolysis gained waste water is filtered through strainer 11, and the colourity of its gained waste water is 1～10, and COD is 30～200mg/L, and ammonia nitrogen is 0～5mg/L, and SS is 0～10mg/L.
Strainer 11 is filtered gained waste water filter, get dialyzate (reuse water) and concentrated solution, dialyzate reuse, concentrated solution discharging through film system 12.
Handle reclamation set embodiment below in conjunction with the leather-making waste water based on nano-catalytic electrolysis tech and membrane technique shown in Figure 1, provide the example of handling reuse method based on the leather-making waste water of nano-catalytic electrolysis tech and membrane technique.
300 ton per day leather-making waste waters are handled and the cleansing and recycling engineering.
Index is as shown in table 1 after measured for described leather-making waste water (comprehensive wastewater).
Table 1
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | |
| 1 | COD Cr | mg/L | 3560 | 5 | BOD5 | mg/L | 1730 |
| 2 | SS | mg/L | 3110 | 6 | S 2 | mg/L | 82 |
| 3 | NH 3-N | mg/L | 265 | 7 | Colourity | 3200 | |
| 4 | Cr | mg/L | 120 | 8 | pH | 9.3 |
Waste water is pressed 15m through water
3The flow velocity of/H enters and flows into equalizing tank 2 mixing after coarse rack filter 1 removes by filter the macrobead solids, again the waste water of equalizing tank 2 is pressed 15m
3The flow pump of/H is gone into hydraulic screen 3 and is filtered depilation and send out and flow into 4 electrolysis of nano-catalytic electrolysis machine after waiting impurity, the electrolytic operating voltage of described nano-catalytic is 48V, strength of current is 375A, two interpolar voltages are for 4.2V, the chlorine [Cl] of the status nascendi that the little electrolysis of nano-catalytic produces is killed the organism in microorganism in the waste water, the oxygenolysis waste water, and makes suspended substance, colloid, charged corpuscle in the waste water form larger particles under electric field action.Waste water after the electrolysis carries out reaction tank 5, adds lime, ferrous sulfate and polyacrylamide, carries out entering settling tank 6 behind the coagulating, and settling tank 6 bottoms precipitation is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud; Settling tank 6 top waste water flow into air-floating apparatus 7 and carry out dissolved air flotation, and the isolating slag in air-floating apparatus 7 tops is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the biochemistry pool 8 through pipeline; The waste water of air-floating apparatus 7 bottoms pumps in the biochemistry pool 8.In biochemistry pool 8,, enter second pond 9 precipitate and separate again through aerobic treatment, waste water after the outflow biochemical treatment of second pond 9 tops, the precipitation of second pond 9 bottoms is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the second pond 9 through pipeline.Through biochemical treatment, be 65 from the colourity of second pond precipitate and separate gained biochemical treatment waste water, COD is 265mg/L, ammonia nitrogen is 3.7mg/L.The effusive biochemical treatment waste water in second pond 9 tops is sent into 10 electrolysis of secondary nano-catalytic electrolysis machine, and electrolytic operating voltage is 40V, and electric current is 375A, and the residence time of waste water in electrolysis machine is 4min.Electrolysis machine 10 electromechanics are separated gained waste water and are filtered through more medium filter 11, waste water after the electrolysis, its colourity is 6, COD is 207mg/L, ammonia nitrogen is 2.5mg/L, SS is 3mg/L.Waste water entered nanofiltration membrane system 12 after more medium filter 11 filtered the gained electrolysis, and nanofiltration membrane component is a rolled membrane module, and the mould material of nanofiltration membrane is the 200MWCO cellulose acetate film for staying molecular weight, and the entrance pressure 6.5bar of film goes out to press 4bar.Yield through nanofiltration membrane system 12 filtering dialyzates (reuse water) is 80%, and the quality of the reuse water of dialyzate (reuse water) is as shown in table 2.
Table 2
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | |
|
| 1 | COD Cr | mg/ |
9 | 4 | | Colourless | ||
| 2 | SS | mg/L | 0 | 5 | pH | 7.7 | ||
| 3 | | NTU | 2 | 6 | Specific conductivity | μS/cm | 1100 |
The waste water recycling engineering is handled in 3000 ton per day process hides.
Index is as shown in table 3 after measured for described leather-making waste water (comprehensive wastewater).
Table 3
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | |
| 1 | COD Cr | mg/L | 3900 | 5 | BOD5 | mg/L | 1950 |
| 2 | SS | mg/L | 4070 | 6 | S 2 | mg/L | 92 |
| 3 | NH 3-N | mg/L | 283 | 7 | Colourity | 2900 | |
| 4 | Cr | mg/L | 93 | 8 | pH | 9.3 |
Waste water is pressed 150m through water
3The flow velocity of/H enters and flows into equalizing tank 2 mixing after coarse rack filter 1 removes by filter the macrobead solids, again the waste water of equalizing tank 2 is pressed 150m
3The flow pump of/H is gone into hydraulic screen 3 and is filtered depilation and send out and flow into 4 electrolysis of nano-catalytic electrolysis machine after waiting impurity, and the electrolytic operating voltage of described nano-catalytic is 380V, and strength of current is 3475A, and two interpolar voltages are for 4.2V, and electrolysis density is 230mA/cm
2, the chlorine [Cl] of the status nascendi that the little electrolysis of nano-catalytic produces is killed the organism in microorganism in the waste water, the oxygenolysis waste water, and makes suspended substance, colloid, charged corpuscle in the waste water form larger particles under electric field action.Waste water after the electrolysis carries out reaction tank 5, adds lime, ferrous sulfate and polyacrylamide, carries out entering settling tank 6 behind the coagulating, and settling tank 6 bottoms precipitation is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud; Settling tank 6 top waste water flow into air-floating apparatus 7 and carry out dissolved air flotation, and the isolating slag in air-floating apparatus 7 tops is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the biochemistry pool 8 through pipeline; The waste water of air-floating apparatus 7 bottoms pumps in the biochemistry pool 8.After in biochemistry pool 8, passing through anaerobic treatment, enter second pond 9 precipitate and separate through after the aerobic treatment again, waste water after the outflow biochemical treatment of second pond 9 tops, the precipitation of second pond 9 bottoms is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, and filtrate flows in the second pond 9 through pipeline.Through biochemical treatment, be 85 from the colourity of second pond precipitate and separate gained biochemical treatment waste water, COD is 165mg/L, ammonia nitrogen is 1.5mg/L.The effusive biochemical treatment waste water in second pond 9 tops is sent into 10 electrolysis of secondary nano-catalytic electrolysis machine, and electrolytic operating voltage is 380V, and electric current is 3670A, and the residence time of waste water in electrolysis machine is 3min.Electrolysis machine 10 electromechanics are separated gained waste water and are filtered through more medium filter 11, waste water after the electrolysis, its colourity is 8, COD is 112mg/L, ammonia nitrogen is 0.9mg/L, SS is 1mg/L.Waste water entered reverse osmosis filter membrane system 12 after more medium filter 11 filtered the gained electrolysis, and film system 12 is a reverse osmosis membrane system as mentioned above, and membrane module is a rolled membrane module, mould material is a composite membrane, its molecular weight cut-off is 50MWCO, and entrance pressure 15.0bar goes out to press 2.5bar.Yield through reverse osmosis membrane system 12 filtering dialyzates (reuse water) is 75%, and the quality of the reuse water of dialyzate (reuse water) is as shown in table 4.
Table 4
| Sequence number | Project | Unit | Measured value | Sequence number | Project | Unit | |
|
| 1 | COD Cr | mg/L | 0 | 4 | | Colourless | ||
| 2 | SS | mg/L | 0 | 5 | pH | 6.5 | ||
| 3 | Turbidity | NTU | 0.8 | 6 | Specific conductivity | μS/cm | 50 |
Claims (5)
1. handle reclamation set based on the leather-making waste water of nano-catalytic electrolysis tech and membrane technique, it is characterized in that being provided with coarse rack filter, equalizing tank, hydraulic screen, nano-catalytic electrolysis machine, reaction tank, settling tank, air-floating apparatus, biochemistry pool, second pond, secondary nano-catalytic electrolysis machine, strainer and film system.The external comprehensive wastewater of the waterwater entrance of coarse rack filter source, the filtered wastewater outlet of coarse rack filter connects the inlet of equalizing tank, the inlet of hydraulic screen connects the wastewater outlet of equalizing tank, the inlet of nano-catalytic electrolysis machine connects the outlet of hydraulic screen, the outlet of nano-catalytic electrolysis machine connects the inlet of reaction tank, the outlet of reaction tank connects the inlet of settling tank, the precipitation outlet of settling tank is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, the wastewater outlet of settling tank connects the inlet of air-floating apparatus, the slag outlet on air-floating apparatus top is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, the filtrate outlet of filter flows in the biochemistry pool through pipeline, the wastewater outlet of air-floating apparatus bottom connects biochemistry pool through pump, the outlet of biochemistry pool connects the inlet of second pond, wastewater outlet connects the inlet of secondary nano-catalytic electrolysis machine after the biochemical treatment on second pond top, the precipitation outlet of second pond bottom is pumped via pipes into the pressure filter filtering separation and becomes filtrate and mud, filtrate flows in the second pond through pipeline, the wastewater outlet of secondary nano-catalytic electrolysis machine is taken over the inlet of filter, the filtration gained wastewater outlet of strainer connects the film system entry, and the film system is provided with dialyzate outlet and concentrated solution discharge outlet.
2. the leather-making waste water based on nano-catalytic electrolysis tech and membrane technique as claimed in claim 1 is handled reclamation set, it is characterized in that described strainer is sand-bed filter, more medium filter or microfiltration membrane system.
3. the leather-making waste water based on nano-catalytic electrolysis tech and membrane technique as claimed in claim 1 is handled reclamation set, it is characterized in that described film system is nanofiltration membrane system or reverse osmosis membrane system.
4. the leather-making waste water based on nano-catalytic electrolysis tech and membrane technique as claimed in claim 3 is handled reclamation set, it is characterized in that the membrane module in the described nanofiltration membrane system is a rolled membrane module, the mould material of nanofiltration membrane is cellulose acetate film or a composite nanometer filtering film in the organic membrane, and its molecular weight cut-off is 200～500MWCO.
5. the leather-making waste water based on nano-catalytic electrolysis tech and membrane technique as claimed in claim 3 is handled reclamation set, the membrane module that it is characterized in that described reverse osmosis membrane system is a rolled membrane module, mould material is cellulose acetate film or a composite membrane in the organic membrane, and its molecular weight cut-off is 50～200MWCO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205856966U CN201842735U (en) | 2010-10-28 | 2010-10-28 | Tanning waste water treatment recycling device based on nano catalytic electrolysis technology and membrane technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979344A (en) * | 2010-10-28 | 2011-02-23 | 波鹰(厦门)科技有限公司 | Nano catalytic electrolysis technology and membrane technology-based leather wastewater treatment and recycling method |
| EP2657197A1 (en) * | 2010-12-24 | 2013-10-30 | Boying Xiamen Science And Technology Co., Ltd. | Tanning wastewater treatment and reuse apparatus and method therefor |
| CN111558254A (en) * | 2020-04-07 | 2020-08-21 | 华东理工大学 | Method and system for removing short hair fibers in leather-making and fur processing wastewater |
-
2010
- 2010-10-28 CN CN2010205856966U patent/CN201842735U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101979344A (en) * | 2010-10-28 | 2011-02-23 | 波鹰(厦门)科技有限公司 | Nano catalytic electrolysis technology and membrane technology-based leather wastewater treatment and recycling method |
| CN101979344B (en) * | 2010-10-28 | 2012-07-25 | 波鹰(厦门)科技有限公司 | Nano catalytic electrolysis technology and membrane technology-based leather wastewater treatment and recycling method |
| EP2657197A1 (en) * | 2010-12-24 | 2013-10-30 | Boying Xiamen Science And Technology Co., Ltd. | Tanning wastewater treatment and reuse apparatus and method therefor |
| EP2657197A4 (en) * | 2010-12-24 | 2015-02-25 | Boying Xiamen Sci & Tech Co | Tanning wastewater treatment and reuse apparatus and method therefor |
| CN111558254A (en) * | 2020-04-07 | 2020-08-21 | 华东理工大学 | Method and system for removing short hair fibers in leather-making and fur processing wastewater |
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