CN103787548A - Biological tannery wastewater treatment system and treatment method thereof - Google Patents
Biological tannery wastewater treatment system and treatment method thereof Download PDFInfo
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- CN103787548A CN103787548A CN201410037163.7A CN201410037163A CN103787548A CN 103787548 A CN103787548 A CN 103787548A CN 201410037163 A CN201410037163 A CN 201410037163A CN 103787548 A CN103787548 A CN 103787548A
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- 238000000034 method Methods 0.000 title claims abstract description 74
- 238000004065 wastewater treatment Methods 0.000 title abstract 3
- 238000005273 aeration Methods 0.000 claims abstract description 89
- 238000004062 sedimentation Methods 0.000 claims abstract description 73
- 239000002351 wastewater Substances 0.000 claims abstract description 68
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 74
- 238000012545 processing Methods 0.000 claims description 39
- 238000010992 reflux Methods 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 27
- 239000001301 oxygen Substances 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 27
- 241000894006 Bacteria Species 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 24
- 239000010802 sludge Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 241000193744 Bacillus amyloliquefaciens Species 0.000 claims description 14
- 241000193755 Bacillus cereus Species 0.000 claims description 14
- 241000194107 Bacillus megaterium Species 0.000 claims description 14
- 241000194103 Bacillus pumilus Species 0.000 claims description 14
- 241000607534 Aeromonas Species 0.000 claims description 12
- 230000001580 bacterial effect Effects 0.000 claims description 12
- 239000002068 microbial inoculum Substances 0.000 claims description 12
- 239000002244 precipitate Substances 0.000 claims description 12
- 241000122230 Acinetobacter junii Species 0.000 claims description 7
- 241000194108 Bacillus licheniformis Species 0.000 claims description 7
- 241000193388 Bacillus thuringiensis Species 0.000 claims description 7
- 241000588919 Citrobacter freundii Species 0.000 claims description 7
- 241000233866 Fungi Species 0.000 claims description 7
- 241000588912 Pantoea agglomerans Species 0.000 claims description 7
- 241000589630 Pseudomonas pseudoalcaligenes Species 0.000 claims description 7
- 241000191963 Staphylococcus epidermidis Species 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 7
- 241000305071 Enterobacterales Species 0.000 claims description 6
- 241000607142 Salmonella Species 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 125000002723 alicyclic group Chemical group 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000006228 supernatant Substances 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 4
- 238000006731 degradation reaction Methods 0.000 claims description 4
- 230000001546 nitrifying effect Effects 0.000 claims description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 10
- 239000010865 sewage Substances 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000593 degrading effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 2
- 230000003647 oxidation Effects 0.000 description 7
- 238000007254 oxidation reaction Methods 0.000 description 7
- 239000010985 leather Substances 0.000 description 6
- 244000005700 microbiome Species 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 241001486707 Aeromonas dhakensis Species 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000976738 Bacillus aryabhattai Species 0.000 description 2
- 235000014469 Bacillus subtilis Nutrition 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000788995 Alicycliphilus denitrificans Species 0.000 description 1
- 241001150378 Bacillus aerophilus Species 0.000 description 1
- 241001150381 Bacillus altitudinis Species 0.000 description 1
- 241000947228 Bacillus endophyticus Species 0.000 description 1
- 241001249117 Bacillus mojavensis Species 0.000 description 1
- 241001150380 Bacillus stratosphericus Species 0.000 description 1
- 241000315694 Bacillus tequilensis Species 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 241000588914 Enterobacter Species 0.000 description 1
- 241000164875 Firmicutes bacterium Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241000108664 Nitrobacteria Species 0.000 description 1
- 241000607568 Photobacterium Species 0.000 description 1
- 241000976133 Rheinheimera aquimaris Species 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 229940097012 bacillus thuringiensis Drugs 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-O sulfonium Chemical compound [SH3+] RWSOTUBLDIXVET-UHFFFAOYSA-O 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention belongs to the field of sewage treatment and relates to a biological treatment method for high-concentration wastewater with high ammonia nitrogen content, in particular to a biological tannery wastewater treatment system and a treatment method thereof. The biological tannery wastewater treatment system comprises a first-stage gridding aeration tank, a horizontal flow sedimentation tank, a second-stage gridding aeration tank and a radial flow sedimentation tank which are communicated sequentially, wherein the bottom of the horizontal flow sedimentation tank is communicated with a material inlet of the first-stage gridding aeration tank through a backflow pump; and the bottom of the radial flow sedimentation tank is communicated with a material inlet of the second-stage gridding aeration tank through the backflow pump. According to the treatment method, the organic degrading proportion and the denitration function of the system are enhanced by two-stage aeration. The treatment system and the treatment method which are disclosed by the invention has the advantages that the treatment effect is obvious, running maintenance is facilitated, the energy consumption is low, and the treatment cost is low; and obvious economical and beneficial benefits are realized.
Description
Technical field
The invention belongs to sewage treatment area, relate to the method for biologically treating wastewater of the high ammonia nitrogen of a kind of high density, relate in particular to a kind of leather-making waste water biological treatment system and treatment process thereof.
technical background:
Leather-making waste water is in current trade effluent, to pollute maximum, one of the most unmanageable waste water.Along with expanding economy, leather industry is the stage in continuous expansion still, the leather-making waste water serious environment pollution of generation.Meanwhile, heavily contaminated also becomes one of obstacle of restriction leather industry development.The principal feature of leather-making waste water is exactly that Pollutant levels are large, complicated component, contain a large amount of hazardous and noxious substances, generally, the pollutent starting point concentration of leather waste water is COD:10000-20000mg/L, BOD:2000-4000mg/L, ammonia nitrogen: 100-300mg/L, SS:2000-4000mg/L, S
2-: 40-160 mg/L, Cr:1000-2500 mg/L.The course of processing complex process of leather is various, and work program is various, and the ammonium sulfate using in pickling process has increased the ammonia-nitrogen content in sewage greatly.Before leather waste water biological treatment, conventionally carry out sufficient pre-treatment to guarantee that sewage is suitable for carrying out a biological disposal upon.Conventional bioremediation has oxidation ditch process, AO method, method of entirely mixing, contact oxidation method, BAF etc.
Oxidation ditch process is a kind of technique conventional in sanitary sewage disposal process, and this method adopts surface aeration, and hydraulic detention time and sludge retention time are longer, and excess sludge is few, and denitrification effect is relatively better.But the organism of leather-making waste water and ammonia nitrogen concentration are conventionally higher, waste water COD after pretreatment is more than 800mg/L, and ammonia nitrogen, more than 100mg/L, has seriously exceeded the water quality subject range of oxidation ditch.In addition, oxidation ditch adopts surface aeration operation, has aggravated the restriction of temperature to microorganism active when winter.
A/O method is more conventional method in sanitary sewage biological treatment and trade effluent biological treatment, and the major advantage of the method is convenient operation and management, has certain denitrification effect, and without nutritional supplementation, structures are few etc., use at present commonplace.But the denitrification effect of A/O is also unstable, and when temperature is lower especially in the winter time, denitrification effect is subject to serious inhibition.The complicated component of leather-making waste water, contains and is difficult in a large number biodegradable organism, and in the effluent quality of the method, COD and ammonia nitrogen are all difficult to up to standardly, must add that advanced treatment program could meet emission request.
Method of entirely mixing, contact oxidation method, BAF etc. all do not have advantage aspect the removing of ammonia nitrogen, wherein, contact oxidation method and Gas biological filter are stricter to the requirement of water inlet, and leather-making waste water is the high-concentration waste water of complicated component, in the time using this kind of technique, must use with other technique, to guarantee system trouble-free operation simultaneously.The shortcoming of this treatment process is that effluent quality fluctuation is large, and system is not easy steady running.
Above traditional bioremediation can not reach the emission standard of leather-making waste water conventionally, wants qualified discharge, need to carry out advanced treatment to biological treatment water outlet.
Chinese patent CN101941782B discloses a kind for the treatment of process of leather waste water, its biological treatment system is made up of anaerobic pond and Aerobic Pond, in treating processes, in Aerobic Pond, add the complex microorganism that accounts for pool volume 1.5 ~ 5%, and then add pond and hold 1 ~ 6% gac, last aeration refluxes, and can discharge.This invents disposable complex microorganism and the gac of adding, and makes nitrobacteria in Aerobic Pond become dominant bacteria, and COD clearance is 80 ~ 90%(220 ~ 308 mg/L), ammonia nitrogen removal frank is 80 ~ 90%(1.9 ~ 29 mg/L), still do not meet relevant national standard.
summary of the invention:
For the biological treatment partially disposed weak effect of existing leather-making waste water, poor stability, energy consumption is high, running maintenance is difficult present situation, through overtesting and actual motion, the present invention proposes a kind for the treatment of effect is obvious, running maintenance convenient, energy consumption is low, processing costs is little biological treatment system and treatment process thereof.
The present invention is achieved through the following technical solutions:
A kind of leather-making waste water biological treatment system, comprise the one-phase grid aeration tank, horizontal sedimentation tank, two-stage grid aeration tank and the radial-flow sedimentation tank that are communicated with in turn, wherein, described horizontal sedimentation tank bottom is communicated with one-phase grid aeration tank opening for feed by reflux pump again, and described radial-flow sedimentation tank bottom is communicated with two-stage grid aeration tank opening for feed by reflux pump again.
According to above-mentioned leather-making waste water biological treatment system, one-phase grid aeration tank is latticed multi-stage aeration pond, inside establish 3 ~ 9 series connection and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange, in the middle of processing lattice, half wall is set, half wall height is that 1/3 ~ 1/2, half wall of processing lattice walls height makes to process lattice bottom and is divided into two disconnected spaces; Wherein, middle part is processed in lattice combined stuffing biofilm is set, and the spacing of respectively organizing combined stuffing biofilm is 20 ~ 40 cm, and preferred distance is 30cm.
According to above-mentioned leather-making waste water biological treatment system, described two-stage grid aeration tank is latticed multi-stage aeration pond, inside establishes 3 ~ 9 series connection of a plug-flow pond and series connection with it and processes lattice, and the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange.
According to above-mentioned leather-making waste water biological treatment system, a submersible agitator is at least set in described plug-flow pond.
According to above-mentioned leather-making waste water biological treatment system, the surface load of described horizontal sedimentation tank is 2 ~ 3 m
3/ (m
2h), preferred 2.5m
3/ (m
2h); The surface load of described radial-flow sedimentation tank is 1.0～1.5 m
3/ (m
2h), preferred 1.2 m
3/ (m
2h).
Utilize above-mentioned biological treatment system to process a method for leather-making waste water, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with organic degradation active sludge or complex microbial inoculum in pond, making bacterial content in waste water is 2.8 ~ 3.2 × 10
4cFU/mL, control dissolved oxygen amount is 0-1mg/L, the residence time is 20 ~ 30h, preferably 24h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 90 ~ 120%, and preferably 100%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, mixes with nitrifying activated sludge or complex microbial inoculum in pond, and making bacterial content in waste water is 2.5 ~ 3.0 × 10
5cFU/mL, controls two-stage grid aeration tank head end dissolved oxygen amount 1 ~ 2 mg/L, end dissolved oxygen amount 2 ~ 3 mg/L, middle part dissolved oxygen amount between head end and end, the residence time 12 ~ 15 h, preferably 14h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 120 ~ 160%, and preferably 150%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting.
According to above-mentioned treatment process, the bacterium that contains following quantity part in step (1) mud or composite fungus agent: genus bacillus (
bacillus) 85 ~ 90 parts, denitrogenation have a liking for alicyclic acid bacterium
(Alicycliphilus denitrificans)4 ~ 5 parts, heavy wall bacillus (
firmicutes bacterium) 1 ~ 2 part, Aeromonas (
aeromonas aquariorum) 1 ~ 2 part, citrobacter freundii (
citrobacter freundii) 1 ~ 2 part, Acinetobacter junii
(Acinetobacter junii) 1 ~ 2 part and marine bacteria pantoea agglomerans (
pantoea agglomerans) 1 ~ 2 part.
According to above-mentioned treatment process, described genus bacillus comprise bacillus pumilus (
b. pumilus) 25 ~ 28 parts, subtilis (
b. subtilis) 23 ~ 25 parts, high ground bacillus (
b. altitudini) 18 ~ 19 parts, bacillus cereus (
b. cereus) 4 ~ 5 parts, stratospheric genus bacillus (
b. stratosphericus) 3 ~ 3.5 parts, A Shi genus bacillus (
b. aryabhattai) 3 ~ 3.5 parts, bacillus megaterium (
b. megaterium) 3 ~ 3.5 parts, aerosporus (
b. aerophilus) 1 ~ 2 part, bacillus amyloliquefaciens (
b. amyloliquefaciens) 1 ~ 2 part and Te Jila genus bacillus (
b. tequilensis) 1 ~ 2 part.
According to above-mentioned treatment process, the bacterium that contains following quantity part in step (3) mud or composite fungus agent: genus bacillus (
bacillus) 63 ~ 70 parts, the silent Salmonella of water Lai Yinhai (
rheinheimera aquimaris) 17 ~ 19 parts, enterobacteria (
enterobacter) 3 ~ 5 parts, staphylococcus epidermidis (
staphylococcus epidermidis) 3 ~ 5 parts, pseudomonas pseudoalcaligenes (
pseudomonas pseudoalcaligenes) 1 ~ 2 part, Aeromonas (
aeromonas aquariorum) 2 ~ 4 parts and photogenic bacterium (
photobacterium) 1 ~ 2 part.
According to above-mentioned treatment process, described genus bacillus comprise bacillus pumilus (
b. pumilus) 14 ~ 16 parts, bacillus cereus (
b. cereus) 13 ~ 15 parts, subtilis (
b. subtilis) 9 ~ 10 parts, bacillus amyloliquefaciens (
b. amyloliquefaciens) 6 ~ 9 parts, A Shi genus bacillus (
b. aryabhattai) 4 ~ 6 parts, Bacillus licheniformis (
b. licheniformis) 3 ~ 4 parts, bacillus megaterium (
b. megaterium) 3 ~ 4 parts, bacillus thuringiensis (
b. thuringiensis) 3 ~ 4 parts, endophytic Bacillus (
b. endophyticus) 1 ~ 2 part and Mo Haiwei genus bacillus (
b. mojavensis) 1 ~ 2 part.
positive beneficial effect of the present invention:
Treatment system of the present invention and method treatment effect are obvious, running maintenance convenient, energy consumption is low, processing costs is little, has significant economic benefit and social benefit.System water inlet index of the present invention: COD is not more than 1200mg/L, and ammonia nitrogen is not more than 180mg/L, and total chromium is not more than 1.5mg/L, and sulfonium ion is not more than 3mg/L.Effluent index after processing: COD is not more than 80mg/L, and ammonia nitrogen is not more than 1mg/L, and total nitrogen is 6-10mg/L.Effluent quality is significantly better than national standard.
(1) Main Function of first stage aeration is to organic oxygenizement, soft-filler biofilm is set and can improves the removal ability to pollutent.The organic function of degrading under the situation of low aeration rate mainly completes by amphimicrobe, and certain acidication effect occurs under longer hydraulic detention time and low-level dissolved oxygen conditions, has improved the ratio of labile organic compound in sewage.
(2) the desirable larger value of the surface load of horizontal sedimentation tank, this is because the sewage load of one-phase aerating system is larger, sludge creation amount is relatively large, not exclusively the mud in small, broken bits of precipitation can enter two-stage aerating system, it is high that this operation scheme contributes to filter out settling property, active strong mud.
(3) Main Function of subordinate phase aeration is the denitrification denitrogenation that carries out the nitrated decomposition of ammonia nitrogen and nitrate, nitrite.The aeration control of two-stage aeration tank is at lower level (traditional denitrification process dissolved oxygen content 3-4 mg/L), so guarantee anoxic and aerobic environment in system and deposit the denitrification functions of reinforcement sludge or composite fungus agent.
(4) radial-flow sedimentation tank carries out the separation of muddy water, and the surface load of radial-flow sedimentation tank adopts lower value, to guarantee the complete of precipitation, reduces as far as possible the content of suspended substance in precipitation water outlet.
(5) aeration tank dissolved oxygen in whole system all can not exceed 3mg/L, in aeration process because aeration rate is lower, part mud or composite fungus agent are deposited in bottom, aeration tank, and this does not affect the treatment effect of sewage, on the contrary dirty water purification is had to certain promoter action.There is not blending in two-stage mud or composite fungus agent and one-phase, to guarantee that separately independently function is interference-free.
accompanying drawing explanation:
Fig. 1 is the schematic flow sheet of leather-making waste water biological treatment system of the present invention;
Fig. 2 is one-phase grid aeration tank structural representation in the embodiment of the present invention 1;
Sequence number in Fig. 2: 1, process lattice, 2, combined stuffing biofilm, 3, Ban Qiang, 4, fluid inlet, 5, liquid outlet;
Fig. 3 is two-stage grid aeration tank structural representation in the embodiment of the present invention 1;
Sequence number in Fig. 3: 1, plug-flow pond, 2, process lattice, 3, fluid inlet, 4, liquid outlet, 5, submersible agitator.
embodiment:
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment 1:
Referring to Fig. 2 and Fig. 3, the present embodiment leather-making waste water biological treatment system comprises the one-phase grid aeration tank, horizontal sedimentation tank, two-stage grid aeration tank and the radial-flow sedimentation tank that are communicated with in turn, wherein, described horizontal sedimentation tank bottom is communicated with one-phase grid aeration tank opening for feed by reflux pump again, and described radial-flow sedimentation tank bottom is communicated with two-stage grid aeration tank opening for feed by reflux pump again.
One-phase grid aeration tank is latticed multi-stage aeration pond, inside establish 9 series connection and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange, in the middle of processing lattice, half wall is set, half wall height is that 1/3 ~ 1/2, half wall of processing lattice walls height makes to process lattice bottom and is divided into two disconnected spaces, wherein, in 4th ~ 6 processing lattice, combined stuffing biofilm is set, the spacing of respectively organizing combined stuffing biofilm is 40cm.
Two-stage grid aeration tank is latticed multi-stage aeration pond, inside establishes 6 series connection of a plug-flow pond and series connection with it and processes lattice, and the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange.A submersible agitator is set in described plug-flow pond.
The surface load of horizontal sedimentation tank is 2.5m
3/ (m
2h); The surface load of described radial-flow sedimentation tank is 1.2 m
3/ (m
2h).
Embodiment 2:
The present embodiment leather-making waste water biological treatment system comprises the one-phase grid aeration tank, horizontal sedimentation tank, two-stage grid aeration tank and the radial-flow sedimentation tank that are communicated with in turn, wherein, described horizontal sedimentation tank bottom is communicated with one-phase grid aeration tank opening for feed by reflux pump again, and described radial-flow sedimentation tank bottom is communicated with two-stage grid aeration tank opening for feed by reflux pump again.
One-phase grid aeration tank is latticed multi-stage aeration pond, inside establish 3 series connection and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange, in the middle of processing lattice, half wall is set, half wall height is that 1/3 ~ 1/2, half wall of processing lattice walls height makes to process lattice bottom and is divided into two disconnected spaces, wherein, in the 2nd processing lattice, combined stuffing biofilm is set, the spacing of respectively organizing combined stuffing biofilm is 30cm.
Two-stage grid aeration tank is latticed multi-stage aeration pond, inside establishes 3 series connection of a plug-flow pond and series connection with it and processes lattice, and the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange.A submersible agitator is set in described plug-flow pond.
The surface load of horizontal sedimentation tank is 2.0m
3/ (m
2h); The surface load of described radial-flow sedimentation tank is 1.0 m
3/ (m
2h).
Embodiment 3:
The present embodiment leather-making waste water biological treatment system comprises the one-phase grid aeration tank, horizontal sedimentation tank, two-stage grid aeration tank and the radial-flow sedimentation tank that are communicated with in turn, wherein, described horizontal sedimentation tank bottom is communicated with one-phase grid aeration tank opening for feed by reflux pump again, and described radial-flow sedimentation tank bottom is communicated with two-stage grid aeration tank opening for feed by reflux pump again.
One-phase grid aeration tank is latticed multi-stage aeration pond, inside establish 6 series connection and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange, in the middle of processing lattice, half wall is set, half wall height is that 1/3 ~ 1/2, half wall of processing lattice walls height makes to process lattice bottom and is divided into two disconnected spaces, wherein, in 3rd ~ 4 processing lattice, combined stuffing biofilm is set, respectively organizing combined stuffing biofilm spacing is 20cm.
Two-stage grid aeration tank is latticed multi-stage aeration pond, inside establishes 9 series connection of a plug-flow pond and series connection with it and processes lattice, and the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange.Two submersible agitators are set in described plug-flow pond.
The surface load of horizontal sedimentation tank is 3.0m
3/ (m
2h); The surface load of described radial-flow sedimentation tank is 1.5 m
3/ (m
2h).
Embodiment 4:
Utilize embodiment 1 biological treatment system to process a method for leather-making waste water, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with the organic degradation active sludge in pond, making bacterial content in waste water is 2.96 × 10
4cFU/mL, control dissolved oxygen amount is 0.5-0.8mg/L, the residence time is 24h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 100%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, enters successively each processing lattice through plug-flow pond plug-flow, mixes with the nitrifying activated sludge in pond, and making bacterial content in waste water is 2.93 × 10
5cFU/mL, controlling two-stage grid aeration tank 1st ~ 2 processing lattice dissolved oxygen amounts is that 1 ~ 1.6 mg/L, 3rd ~ 4 processing lattice dissolved oxygen amounts are that 1.6 ~ 2.4 mg/L, 5th ~ 6 process lattice dissolved oxygen amount 2.4 ~ 3 mg/L, residence time 14h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 150%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting, and water outlet detects data in table 1.
Wherein, the bacterium that step (1) mud contains following quantity part: 1 part of 5 parts of alicyclic acid bacteriums, 1 part of heavy wall bacillus, 2 parts of Aeromonass, 2 parts of citrobacter freundiis, 1 part of Acinetobacter junii and marine bacteria pantoea agglomerans is had a liking in 88 parts of genus bacillus, denitrogenation; Described genus bacillus comprises again 1 part of 28 parts of bacillus pumilus, 23 parts of subtilises, 19 parts of high ground bacillus, 4 parts of bacillus cereuss, 3.5 parts of stratospheric genus bacillus, 3 parts of A Shi genus bacillus, 3.5 parts of bacillus megateriums, 1 part of aerosporus, 2 parts of bacillus amyloliquefaciens and Te Jila genus bacillus.The bacterium that contains following quantity part in step (3) mud: 2 parts of 18 parts of the silent Salmonellas of 67 parts of genus bacillus, water Lai Yinhai, 4 parts of enterobacterias, 4 parts of staphylococcus epidermidiss, 2 parts of pseudomonas pseudoalcaligeneses, 3 parts of Aeromonass and photogenic bacteriums; Described genus bacillus comprises again 2 parts of 15 parts of bacillus pumilus, 14 parts of bacillus cereuss, 10 parts of subtilises, 8 parts of bacillus amyloliquefaciens, 6 parts of A Shi genus bacillus, 3 parts of Bacillus licheniformis, 4 parts of bacillus megateriums, 3 parts of bacillus thuringiensiss, 2 parts of endophytic Bacillus and Mo Haiwei genus bacillus.
Embodiment 5:
Utilize embodiment 2 biological treatment systems to process a method for leather-making waste water, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with the organic degradation active sludge in pond, making bacterial content in waste water is 2.8 × 10
4cFU/mL, control dissolved oxygen amount is 0-0.5mg/L, the residence time is 20h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 90%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, enters successively each processing lattice through plug-flow pond plug-flow, mixes with the nitrifying activated sludge in pond, and making bacterial content in waste water is 2.5 × 10
5cFU/mL, controlling two-stage grid aeration tank the 1st processing lattice dissolved oxygen amount is that 1.2 ~ 1.8 mg/L, the 2nd processing lattice dissolved oxygen amount are that 1.8 ~ 2.2 mg/L, the 3rd process lattice dissolved oxygen amount 2.2 ~ 2.5 mg/L, residence time 12h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 120%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting, and water outlet detects data in table 1.
Wherein, the bacterium that step (1) mud contains following quantity part: 2 parts of 5 parts of alicyclic acid bacteriums, 2 parts of heavy wall bacillus, 2 parts of Aeromonass, 2 parts of citrobacter freundiis, 2 parts of Acinetobacter juniis and marine bacteria pantoea agglomerans are had a liking in 85 parts of genus bacillus, denitrogenation; Described genus bacillus comprises again 1 part of 27 parts of bacillus pumilus, 24 parts of subtilises, 18 parts of high ground bacillus, 4 parts of bacillus cereuss, 3 parts of stratospheric genus bacillus, 3 parts of A Shi genus bacillus, 3 parts of bacillus megateriums, 1 part of aerosporus, 1 part of bacillus amyloliquefaciens and Te Jila genus bacillus.The bacterium that contains following quantity part in step (3) mud: 2 parts of 17 parts of the silent Salmonellas of 70 parts of genus bacillus, water Lai Yinhai, 4 parts of enterobacterias, 3 parts of staphylococcus epidermidiss, 2 parts of pseudomonas pseudoalcaligeneses, 2 parts of Aeromonass and photogenic bacteriums; Described genus bacillus comprises again 2 parts of 16 parts of bacillus pumilus, 15 parts of bacillus cereuss, 9 parts of subtilises, 9 parts of bacillus amyloliquefaciens, 6 parts of A Shi genus bacillus, 4 parts of Bacillus licheniformis, 4 parts of bacillus megateriums, 3 parts of bacillus thuringiensiss, 2 parts of endophytic Bacillus and Mo Haiwei genus bacillus.
Embodiment 6:
Utilize embodiment 3 biological treatment systems to process a method for leather-making waste water, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with the complex microbial inoculum in pond, making bacterial content in waste water is 3.2 × 10
4cFU/mL, control dissolved oxygen amount is 0.5 ~ 1mg/L, the residence time is 30h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 120%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, enters successively each processing lattice through plug-flow pond plug-flow, mixes with the complex microbial inoculum in pond, and making bacterial content in waste water is 3.0 × 10
5cFU/mL, controlling two-stage grid aeration tank 1st ~ 3 processing lattice dissolved oxygen amounts is that 1.5 ~ 2.0 mg/L, 4th ~ 6 processing lattice dissolved oxygen amounts are that 2.0 ~ 2.5 mg/L, 7th ~ 9 process lattice dissolved oxygen amount 2.5 ~ 3.0 mg/L, residence time 15h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 160%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting, and water outlet detects data in table 1.
Wherein, the bacterium that step (1) complex microbial inoculum contains following quantity part: 1 part of 4 parts of alicyclic acid bacteriums, 2 parts of heavy wall bacillus, 1 part of Aeromonas, 1 part of citrobacter freundii, 1 part of Acinetobacter junii and marine bacteria pantoea agglomerans is had a liking in 90 parts of genus bacillus, denitrogenation; Described genus bacillus comprises again 1 part of 28 parts of bacillus pumilus, 25 parts of subtilises, 18 parts of high ground bacillus, 5 parts of bacillus cereuss, 3.5 parts of stratospheric genus bacillus, 3.5 parts of A Shi genus bacillus, 3 parts of bacillus megateriums, 2 parts of aerosporus, 1 part of bacillus amyloliquefaciens and Te Jila genus bacillus.The bacterium that contains following quantity part in step (3) complex microbial inoculum: 2 parts of 19 parts of the silent Salmonellas of 63 parts of genus bacillus, water Lai Yinhai, 5 parts of enterobacterias, 5 parts of staphylococcus epidermidiss, 2 parts of pseudomonas pseudoalcaligeneses, 4 parts of Aeromonass and photogenic bacteriums; Described genus bacillus comprises again 2 parts of 14 parts of bacillus pumilus, 13 parts of bacillus cereuss, 9 parts of subtilises, 6 parts of bacillus amyloliquefaciens, 6 parts of A Shi genus bacillus, 4 parts of Bacillus licheniformis, 4 parts of bacillus megateriums, 3 parts of bacillus thuringiensiss, 2 parts of endophytic Bacillus and Mo Haiwei genus bacillus.
Embodiment 7:
Utilize embodiment 1 biological treatment system to process a method for leather-making waste water, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with the complex microbial inoculum in pond, making bacterial content in waste water is 2.96 × 10
4cFU/mL, control dissolved oxygen amount is 0.5-0.8mg/L, the residence time is 24h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 100%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, enters successively each processing lattice through plug-flow pond plug-flow, mixes with the complex microbial inoculum in pond, and making bacterial content in waste water is 2.93 × 10
5cFU/mL, controlling two-stage grid aeration tank 1st ~ 2 processing lattice dissolved oxygen amounts is that 1 ~ 1.6 mg/L, 3rd ~ 4 processing lattice dissolved oxygen amounts are that 1.6 ~ 2.4 mg/L, 5th ~ 6 process lattice dissolved oxygen amount 2.4 ~ 3 mg/L, residence time 14h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 150%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting, and water outlet detects data in table 1.
Wherein, the bacterium that step (1) complex microbial inoculum contains following quantity part: 1.5 parts of 4.5 parts of alicyclic acid bacteriums, 2 parts of heavy wall bacillus, 1.5 parts of Aeromonass, 1.5 parts of citrobacter freundiis, 1.5 parts of Acinetobacter juniis and marine bacteria pantoea agglomerans are had a liking in 87.5 parts of genus bacillus, denitrogenation; Described genus bacillus comprises again 1 part of 26.5 parts of bacillus pumilus, 24 parts of subtilises, 18.5 parts of high ground bacillus, 4.5 parts of bacillus cereuss, 3.5 parts of stratospheric genus bacillus, 3 parts of A Shi genus bacillus, 3.5 parts of bacillus megateriums, 1 part of aerosporus, 2 parts of bacillus amyloliquefaciens and Te Jila genus bacillus.The bacterium that contains following quantity part in step (3) complex microbial inoculum: 2 parts of 18 parts of the silent Salmonellas of 66 parts of genus bacillus, water Lai Yinhai, 4 parts of enterobacterias, 4 parts of staphylococcus epidermidiss, 1 part of pseudomonas pseudoalcaligenes, 3 parts of Aeromonass and photogenic bacteriums; Described genus bacillus comprises again 1 part of 15 parts of bacillus pumilus, 14 parts of bacillus cereuss, 10 parts of subtilises, 7.5 parts of bacillus amyloliquefaciens, 5 parts of A Shi genus bacillus, 4 parts of Bacillus licheniformis, 4 parts of bacillus megateriums, 3.5 parts of bacillus thuringiensiss, 2 parts of endophytic Bacillus and Mo Haiwei genus bacillus.
The treatment stage that table 1 embodiment 4 ~ 7 being each, water outlet detects data
Claims (10)
1. a leather-making waste water biological treatment system, is characterized in that: comprise the one-phase grid aeration tank, horizontal sedimentation tank, two-stage grid aeration tank and the radial-flow sedimentation tank that are communicated with in turn; Wherein, described horizontal sedimentation tank bottom is communicated with one-phase grid aeration tank opening for feed by reflux pump again, and described radial-flow sedimentation tank bottom is communicated with two-stage grid aeration tank opening for feed by reflux pump again.
2. leather-making waste water biological treatment system according to claim 1, it is characterized in that: one-phase grid aeration tank is latticed multi-stage aeration pond, inside establish 3 ~ 9 series connection and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange, in the middle of processing lattice, half wall is set, half wall height is that 1/3 ~ 1/2, half wall of processing lattice walls height makes to process lattice bottom and is divided into two disconnected spaces; Wherein, middle part is processed in lattice combined stuffing biofilm is set, and the spacing of respectively organizing combined stuffing biofilm is 20 ~ 40 cm.
3. leather-making waste water biological treatment system according to claim 1, it is characterized in that: described two-stage grid aeration tank is latticed multi-stage aeration pond, inside establish 3 ~ 9 series connection of a plug-flow pond and series connection with it and process lattice, the fluid inlet of each processing lattice and liquid outlet diagonal angle arrange.
4. leather-making waste water biological treatment system according to claim 3, is characterized in that: a submersible agitator is at least set in described plug-flow pond.
5. leather-making waste water biological treatment system according to claim 1, is characterized in that: the surface load of described horizontal sedimentation tank is 2 ~ 3 m
3/ (m
2h); The surface load of described radial-flow sedimentation tank is 1.0～1.5 m
3/ (m
2h).
6. utilize biological treatment system described in claim 1 ~ 5 any one to process a method for leather-making waste water, it is characterized in that, comprise the following steps:
(1) pretreated leather-making waste water is passed into one-phase grid aeration tank, mix with organic degradation active sludge or complex microbial inoculum in pond, make bacterial content in waste water reach 2.8 ~ 3.2 × 10
4cFU/mL, control dissolved oxygen amount is 0-1mg/L, the residence time is 20 ~ 30h; Then, waste water after treatment enters horizontal sedimentation tank and precipitates;
(2) the part mud of horizontal sedimentation tank bottom settlings is evacuated to one-phase grid aeration tank fluid inlet through reflux pump, and reflux ratio is 90 ~ 120%, and excess sludge is regularly discharged;
(3) horizontal sedimentation tank upper liquid enters two-stage grid aeration tank, mixes with nitrifying activated sludge or complex microbial inoculum in pond, makes bacterial content in waste water reach 2.5 ~ 3.0 × 10
5cFU/mL, controls two-stage grid aeration tank head end dissolved oxygen amount 1 ~ 2 mg/L, end dissolved oxygen amount 2 ~ 3 mg/L, middle part dissolved oxygen amount between head end and end, the residence time 12 ~ 15 h; Then, waste water after treatment enters radial-flow sedimentation tank and precipitates;
(4) the part mud of radial-flow sedimentation tank bottom settlings is evacuated to two-stage grid aeration tank fluid inlet through reflux pump, and reflux ratio is 120 ~ 160%, and excess sludge is regularly discharged;
(5) radial-flow sedimentation tank supernatant liquor is discharged, biological treatment completes, and carries out can discharging after air supporting.
7. treatment process according to claim 6, is characterized in that: the bacterium that contains following quantity part in step (1) mud or composite fungus agent: 1 ~ 2 part of 1 ~ 2 part of 4 ~ 5 parts of alicyclic acid bacterium, 1 ~ 2 part of heavy wall bacillus, 1 ~ 2 part of Aeromonas, 1 ~ 2 part of citrobacter freundii, Acinetobacter junii and marine bacteria pantoea agglomerans is had a liking in 85 ~ 90 parts of genus bacillus, denitrogenation.
8. treatment process according to claim 7, is characterized in that: described genus bacillus comprises 1 ~ 2 part of 1 ~ 2 part of 25 ~ 28 parts of bacillus pumilus, 23 ~ 25 parts of subtilises, 18 ~ 19 parts of high ground bacillus, 4 ~ 5 parts of bacillus cereuss, 3 ~ 3.5 parts of stratospheric genus bacillus, 3 ~ 3.5 parts of A Shi genus bacillus, 3 ~ 3.5 parts of bacillus megateriums, 1 ~ 2 part of aerosporus, bacillus amyloliquefaciens and Te Jila genus bacillus.
9. treatment process according to claim 6, is characterized in that: the bacterium that contains following quantity part in step (3) mud or composite fungus agent: 1 ~ 2 part of 17 ~ 19 parts of the silent Salmonellas of 63 ~ 70 parts of genus bacillus, water Lai Yinhai, 3 ~ 5 parts of enterobacterias, 3 ~ 5 parts of staphylococcus epidermidiss, 1 ~ 2 part of pseudomonas pseudoalcaligenes, 2 ~ 4 parts of Aeromonass and photogenic bacterium.
10. treatment process according to claim 9, is characterized in that: described genus bacillus comprises 1 ~ 2 part of 1 ~ 2 part of 14 ~ 16 parts of bacillus pumilus, 13 ~ 15 parts of bacillus cereuss, 9 ~ 10 parts of subtilises, 6 ~ 9 parts of bacillus amyloliquefaciens, 4 ~ 6 parts of A Shi genus bacillus, 3 ~ 4 parts of Bacillus licheniformis, 3 ~ 4 parts of bacillus megateriums, 3 ~ 4 parts of bacillus thuringiensiss, endophytic Bacillus and Mo Haiwei genus bacillus.
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