CN109020052A - leather waste water treatment system and method - Google Patents

leather waste water treatment system and method Download PDF

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Publication number
CN109020052A
CN109020052A CN201810754692.7A CN201810754692A CN109020052A CN 109020052 A CN109020052 A CN 109020052A CN 201810754692 A CN201810754692 A CN 201810754692A CN 109020052 A CN109020052 A CN 109020052A
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China
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tank
sludge
pond
waste water
sedimentation basin
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CN201810754692.7A
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Inventor
陈宽
陈勇
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Zhejiang World Clean Environment Engineering Co Ltd
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Zhejiang World Clean Environment Engineering Co Ltd
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Priority to CN201810754692.7A priority Critical patent/CN109020052A/en
Publication of CN109020052A publication Critical patent/CN109020052A/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/105—Characterized by the chemical composition
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • C02F3/109—Characterized by the shape
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C02F2101/22—Chromium or chromium compounds, e.g. chromates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
    • C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F7/00—Aeration of stretches of water
    • 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

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses a kind of Leather waste water treatment systems, including the pretreatment unit, coagulation air-float processing unit, A/O biochemical treatment unit and the pond MBBR that successively penetrate through and third sedimentation basin, add spherical suspending biologic packing material inside the pond MBBR.The Leather waste water treatment system and method that the present invention obtains, using " classification removes chromium+coagulation air-float+A/O+MBBR treatment process ", the treatment effect of leather waste water is greatly improved, and reduces the cost of disposal of chromium-bearing sludge, is a kind of practicable leather waste water New Process for Treatment.

Description

Leather waste water treatment system and method
Technical field
The present invention relates to a kind of technical field of waste water processing, especially Leather waste water treatment system and method.
Background technique
Leather waste water refers to that leather production prepared with the tanning stage, i.e., the waste water generated during wet practice.Process hides Factory's wastewater discharge is big, pH value is high, coloration is high, pollutant kind is various, complicated component.Major pollutants have heavy metal chromium, can Soluble proteins, scurf, suspended matter, tannin, lignin, inorganic salts, oils, surfactant, dyestuff and resin etc..Process hides Processing is to complete using Animal Skin as raw material by being chemically treated and being machined.In this course, there is a large amount of protein A large amount of industrial chemicals that waste water can be transferred to fat, used in waste residue and in process, such as acid, alkali, salt, vulcanization Sodium, lime, the agent of chromium boots, fatting agent, dyestuff etc., these also have quite a few and are into waste water.
Beam house includes the works such as immersion fleshing, depilation liming, deashing and softening, degreasing before leather-making waste water mostlys come from boots Sequence, Xue Zhi workshop section include after washing, pickling, the process processed of trampling on, boots finishing workshop section including trampling on, neutralizing again, water squeezing, dyeing, stuffing etc. Process.The waste liquid that these process generate mostly is that interval is discharged, and the waste water of discharge is the most important pollution of leather industry Source.Since the content of the organic matters such as protein in leather waste water is especially high, and in waste water containing a certain amount of reducing substances, Cr3+ and Cr6+, so COD value, BOD value and ammonia nitrogen are all very high, if water body bacterium can be promoted largely numerous without processing direct emission It grows, causes pollution of waterhead, meanwhile, these organic matters are discharged into after water body the dissolved oxygen that largely consume in water body, and when molten in water When solving oxygen lower than 4mg/L, it will cause the aquatiles such as fish expiratory dyspnea even dead, to seriously affect water ecology Balance.Currently, the method handled both at home and abroad leather waste water containing chromium mainly has: alkaline precipitation, distillation under vacuum, reverse osmosis Method, ion-exchange, solution extraction, direct circulation utilization method etc..These methods have the advantages that certain, also there is its deficiency Place, for example, processing time length, complex process, occupation area of equipment is big, cumbersome, operational reliability is bad, and generally all It is that chromate waste water is handled together, causes chromium-bearing sludge more, sludge treatment processing cost is high.
Summary of the invention
There is provided that a kind of waste water treatment efficiency is high, operation the purpose of the present invention is to solve above-mentioned the deficiencies in the prior art Reliable and low processing cost Leather waste water treatment system and method.
To achieve the goals above, the Leather waste water treatment system designed by the present invention, including the pretreatment successively penetrated through Unit, coagulation air-float processing unit, A/O biochemical treatment unit and the pond MBBR and third sedimentation basin,
Wherein pretreatment unit includes high-concentration chromium-containing wastewater processing unit and low-concentration chromate waste water processing unit, institute Stating high-concentration chromium-containing wastewater processing unit includes sequentially connected first grille well, the first conditioning tank, the first reaction tank and One sedimentation basin, the first sludge-tank, the first sludge filter press, the low-concentration chromate waste water processing unit include sequentially connected It is equipped on two grille wells, the second conditioning tank, the second reaction tank and the second sedimentation basin, the first reaction tank and the second reaction tank FeSO4Adding of agent mouth and NaOH adding of agent mouth, wherein FeSO4Dosage is 0.5-1.0kg/m3, NaOH concentration is 20% molten Liquid；
Coagulation air-float processing unit includes sequentially connected comprehensive adjustment pond, pipe-line mixer and flotation tank, the pipeline For mixer there are two mouth is added, one is used for dosing coagulant, another is for adding flocculation aid, and wherein coagulant is 5% PAC solution, the PAM solution that flocculation aid is 0.1%；Specific dosage is determined according to practical influent quality.Dosing make up a prescription by one Body makes up a prescription and completes in chemicals dosing plant.
A/O biochemical treatment unit includes anoxic pond and aerobic tank, while the water inlet in the water outlet of aerobic tank and anoxic pond It is equipped with nitrification liquid return pipe between end, diving mixer is set in anoxic pond, the waste water in anoxic pond is stirred, increases Waterpower mobility improves Biochemical Treatment.Blast aeration equipment is installed outside aerobic tank, aerating system is set inside pond. Liquid alkaline throwing device is arranged in aerobic tank front end.
The front end in the pond MBBR is equipped with external carbon addition device, and spherical suspending biologic packing material is added inside the pond MBBR, The specific gravity of the spherical suspending biologic packing material is 0.92-0.95g/cm3, specific surface area 500-800m2/m3, feed ratio is pool capacity 50-70%；
Mud return line is equipped between third sedimentation basin and anoxic pond, return sludge ratio is controlled in 50-100%.
The flotation tank, anoxic pond, aerobic tank, the pond MBBR and the second sedimentation basin, third sedimentation basin are connected with the simultaneously Two sludge-tanks, second sludge-tank rear end are connected with the second sludge filter press.
First sludge filter press and the second sludge filter press are connected with collecting-tank, the other end of the collecting-tank simultaneously It is connect with comprehensive adjustment pond.
The wherein spherical suspending biologic packing material in the pond MBBR is also socketed with one in the shell including shell spherical in shape A spherosome that can longitudinally rotate, be socketed in spherosome can transverse rotation ellipsoid；Hollow out is distributed on the shell Hole, the aperture of hollow out is distributed on the spherosome, fin is distributed on the ellipsoid, is distributed between each fin Through slot.The shell, spherosome and ellipsoidal material are any one of modified polypropene or modified poly ethylene.
The modified polypropene is made by being covered with hydrophilic agent in the painting of polyacrylic surface, and the hydrophilic agent is by weight Including 5-10 parts of nano silica, 10-15 parts of alkyl phenol polyoxyethylene ether, 1-5 parts of carbon nanotube, 10-15 parts of polyvinyl chloride, 50-60 parts of ethyl alcohol, 10-15 parts of isopropanol, 30-40 parts of water.The preparation method of the hydrophilic agent is by weight by nano-silica 5-10 parts of SiClx, 10-15 parts of alkyl phenol polyoxyethylene ether, 1-5 parts of carbon nanotube, 10-15 parts of polyvinyl chloride, 50-60 parts of ethyl alcohol, 10-15 parts of isopropanol, 30-40 parts of water be mixed evenly after, stand 24 hours.
The modified poly ethylene includes 95 parts of polyethylene and 5 parts of modifying agent by weight, and the modifying agent wraps by weight Include 50-60 parts of polyacrylate, 20-30 parts of polyethylene glycol, 10-15 parts of Kynoar, 5-8 parts of polyurethane, basic zirconium phosphate 2-3 Part, 1-3 parts of rare earth.The preparation method of the modifying agent is by weight by 50-60 parts of polyacrylate, polyethylene glycol 20-30 Part, 10-15 parts of Kynoar, 5-8 parts of polyurethane, 2-3 parts of basic zirconium phosphate, 1-3 parts of rare earth be put into 200-240 DEG C of pyroreaction In furnace, 1-2h is heated under nitrogen protection, is pulverized after cooling to obtain the final product.The preparation method of the modified poly ethylene is by weight By 95 parts of polyethylene and 5 parts of modifying agent, the heating melting in extruder squeezes out part, and temperature is 200-220 DEG C.
The spherical suspending biologic packing material includes shell, spherosome and ellipsoid from outside to inside, and wherein spherosome can longitudinally revolve Turn, ellipsoid can transverse rotation.By three spheres of setting to increase the water body flow inside filler.Water body inside filler It can be acted on there are two effective after mobility increase.First, increase the touch opportunity of the biomembrane on sewage and filler, to increase Strong wastewater treatment efficiency；Second, make to be not easy to block inside filler, the biomembrane demoulding of aging is easy, and extends the use of filler And the replacement cycle.By the way that multiple internal structure bodies are arranged, especially ellipsoidal fin even more improves the specific surface of filling ball Product.
The shell, spherosome and ellipsoidal material are any one of modified polypropene or modified poly ethylene.This It is that the microorganism being unfavorable in sewage is attached to forms biology above since polypropylene and polyethylene ontology are relative hydrophobics Film, it is therefore desirable to which it is modified.
The modified polypropene is to be covered with the alkyl that hydrophilic agent is obtained, in the hydrophilic agent by applying on polyacrylic surface Phenol polyethenoxy ether is a kind of nonionic surfactant as main hydrophilic component, it have property stable, acid and alkali-resistance and at This low feature.Intensity can be improved in nano silica and carbon nanotube, and polyvinyl chloride improves hydrophily as auxiliary agent.Second Alcohol, isopropyl alcohol and water are as solvent.
The modified poly ethylene by parts by weight by 95 parts of polyethylene and 5 parts of modifying agent in extruder heating melting squeeze out and , polyacrylate, polyethylene glycol and polyurethane in the modifying agent can improve the hydrophily of polyethylene, polyacrylic acid Contain on the strand of ester there are many ester group, ester group, there is hydrophily.The terminal hydroxy group of polyethylene glycol is hydrophilic, the ehter bond in chain It is hydrophilic.Anti-corrosive properties can be improved in Kynoar, and basic zirconium phosphate then improves intensity, and rare earth improves the parent of modifying agent as catalyst It is aqueous.
The invention also discloses a kind of leather waste water processing methods, comprising the following steps:
A) it pre-processes: each workshop high-concentration chromium-containing wastewater and low-concentration chromate waste water being separated into individually processing, by high concentration Chromate waste water carries out primary filtration by the first grille well, and water outlet enters the first adjusting after excluding agglomerate floater and suspended matter Pond；Waste water in first conditioning tank is lifted into the first reaction tank by elevator pump, adds FeSO in the first reaction tank4And Aeration, while NaOH solution is added, the first sedimentation basin is entered after reaction and is precipitated, obtains handling water and high concentration mud containing chromium containing chromium. Supernatant in first sedimentation basin is discharged into comprehensive adjustment pond.High concentration chromium-bearing sludge enters the first sludge-tank.This preprocessing process It can remove the heavy metal ion such as insoluble substances and Cr3+ and Cr6+ such as meat bits, slag wool, the lime in waste water.By low concentration Chromate waste water carries out primary filtration by the second grille well, and water outlet enters the second adjusting after excluding agglomerate floater and suspended matter Pond；Waste water in second conditioning tank is lifted into the second reaction tank by elevator pump, adds FeSO in the second reaction tank4And Aeration, while NaOH solution is added, the second sedimentation basin is entered after reaction and is precipitated, obtains handling water and low concentration mud containing chromium containing chromium. Supernatant in second sedimentation basin is discharged into comprehensive adjustment pond.Low concentration chromium-bearing sludge enters the second sludge-tank.Low concentration is dirty containing chromium Mud can be classified as common sludge.
B) coagulation air-float is handled: the waste water in comprehensive adjustment pond being lifted into flotation tank by elevator pump, waste water passes through Enter anoxic pond after flotation tank mud-water separation.Two pipe-line mixers, a dosing coagulant, another throwing are set before flotation tank Add flocculation aid.Setting supersonic liquid level device controls the start and stop of elevator pump in conditioning tank.This system selects structure simple, what low energy consumption Cost for wastewater treatment is reduced in cavitation air flotation pond.
C) A/O biochemical treatment: the water outlet gravity flow of above-mentioned air-flotation process being entered in hypoxia response pond and is handled, the residence time For 6-8h.Anti-nitration reaction in anoxic pond is the committed step of denitrification reaction.Nitrification liquid from aerobic tank flows back into scarce Oxygen pond, the nitrate nitrogen, nitrite nitrogen in nitrification liquid and the carbon source in anoxic pond carry out anti-nitration reaction and generate nitrogen, thus thoroughly Nitrogen is removed from sewerage.Aerobic tank dwell time of sewage is 12-16h.Be substantially carried out in aerobic tank nitration reaction and The reaction of thorough degradation of organic substances.Under aerobic condition using nitrobacteria by mineralized nitrogen be nitrate nitrogen and nitrite nitrogen, together When organic matter exhaustive oxidation decompose.Diving mixer is set in anoxic pond, the waste water in anoxic pond is stirred, increases waterpower Mobility improves Biochemical Treatment.Blast aeration equipment is installed outside aerobic tank, aerating system is set inside pond.It is aerobic Liquid alkaline throwing device is arranged in pond front end, and due to nitrification, pH value of waste water is reduced, it is therefore desirable to add liquid alkaline to promote pH value, Nitration reaction is set to be normally carried out.This system mixed liquid recycle ratio is controlled in 100-200%.
D) pond MBBR is handled: the pond MBBR dwell time of sewage is 4-6h.The pond the MBBR main function of this system is to continue with drop Solution fails the pollutant completely removed.External carbon addition device is arranged in the pond MBBR front end, and the outer carbon source of this system uses industrial methanol. Spherical suspending biologic packing material is added inside the pond MBBR.The specific gravity of spherical suspending biologic packing material is 0.92-0.95g/cm3, specific surface Product is 500-800m2/m3, feed ratio is the 50-70% of pool capacity.Water hole setting grid in the pond MBBR prevents spherical suspending biological Filler flows into sedimentation basin below.
E) precipitate: waste water carries out mud-water separation, supernatant qualified discharge in sedimentation basin.Sludge settling gets off.This system Return sludge ratio is controlled in 50-100%.
F) Treatment of Sludge: the high concentration chromium-bearing sludge that the first sedimentation basin generates enters the first sludge-tank, in the first sludge-tank Supernatant be emitted into collecting-tank.Thickened sludge is squeezed into the first sludge filter press by sludge pump and is carried out dehydrating, and first The filtrate that sludge filter press generates enters collecting-tank.Dangerous waste processing company's profession disposition is transferred to after mud cake desiccation.Second sedimentation basin The low concentration chromium-bearing sludge of generation enters the second sludge-tank.Flotation tank generate sludge and anoxic pond, aerobic tank, the pond MBBR, The excess sludge that third sedimentation basin generates all enters the second sludge-tank.Sludge is in the second sludge-tank after concentration, supernatant It is emitted into sump.Thickened sludge is squeezed into the second sludge filter press by sludge pump and is carried out dehydrating, the second sludge press filtration The filtrate that machine generates enters collecting-tank.Outward transport carries out landfill disposal after mud cake desiccation.
The Leather waste water treatment system and method that the present invention obtains, using " classification is located except chromium+coagulation air-float+A/O+MBBR Science and engineering skill ", greatly improves the treatment effect of leather waste water, and reduces the cost of disposal of chromium-bearing sludge, is a kind of practical Leather waste water New Process for Treatment, its advantages are as follows:
1, the chromate waste water of high-concentration and low-concentration is separately pre-processed, substantially reduces the amount of chromium-bearing sludge, therefore reduce at dangerous waste It is set to this, saves operating cost.
2, this system replaces coagulation reaction tank with pipe-line mixer, replaces coagulative precipitation tank with flotation tank, can effectively save Structures occupied area accelerates mud-water separation, while improving coagulating effect.
3, increase the pond MBBR behind traditional A/O technique.The pollutant of the pond MBBR unreasonable proportion after can handling A/O Index high-efficient purification, to promote the treatment effect of entire technique.
Detailed description of the invention
Fig. 1 is the flow chart of the Leather waste water treatment system of embodiment 1；
Fig. 2 is the structural schematic diagram of the spherical suspending biologic packing material of embodiment 1；
Fig. 3 is ellipsoidal structural schematic diagram in the spherical suspending biologic packing material of embodiment 1.
In figure: the first grille well 1, the first conditioning tank 2, the first reaction tank 3, the first sedimentation basin 4, the first sludge-tank 5, first Sludge filter press 6, the second grille well 7, the second conditioning tank 8, the second reaction tank 9, the second sedimentation basin 10, comprehensive adjustment pond 11, pipe Road mixer 12, flotation tank 13, anoxic pond 14, aerobic tank 15, the pond MBBR 16, third sedimentation basin 17, the second sludge-tank 18, second Sludge filter press 19, mud return line 20, nitrification liquid return pipe 21, collecting-tank 22, shell 51, spherosome 52, ellipsoid 53, hole Hole 54, aperture 55, fin 56, through slot 57.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment 1:
As shown in Figure 1, a kind of Leather waste water treatment system provided in this embodiment, including the pretreatment list successively penetrated through Member, coagulation air-float processing unit, A/O biochemical treatment unit and the pond MBBR 16 and third sedimentation basin 17,
Wherein pretreatment unit includes high-concentration chromium-containing wastewater processing unit and low-concentration chromate waste water processing unit, institute State high-concentration chromium-containing wastewater processing unit include sequentially connected first grille well 1, the first conditioning tank 2, the first reaction tank 3 and First sedimentation basin 4, the first sludge-tank 5, the first sludge filter press 6, the low-concentration chromate waste water processing unit include successively connecting The second grille well 7, the second conditioning tank 8, the second reaction tank 9 and the second sedimentation basin 10 connect, the first reaction tank 3 and the second reaction FeSO is equipped on pond 94Adding of agent mouth and NaOH adding of agent mouth, wherein FeSO4Dosage is 0.5-1.0kg/m3, NaOH Concentration is 20% solution；
Coagulation air-float processing unit includes sequentially connected comprehensive adjustment pond 11, pipe-line mixer 12 and flotation tank 13, institute Pipe-line mixer 12 is stated there are two mouth is added, one is used for dosing coagulant, another is used to add flocculation aid, wherein coagulant For 5% PAC solution, the PAM solution that flocculation aid is 0.1%；
A/O biochemical treatment unit includes anoxic pond 14 and aerobic tank 15, while in the water outlet of aerobic tank 15 and anoxic pond It is equipped with nitrification liquid return pipe 21 between 14 water inlet end, diving mixer is set in anoxic pond 14, is installed outside aerobic tank 15 Blast aeration equipment, inside setting aerating system, is in addition arranged liquid alkaline throwing device in 15 front end of aerobic tank；
The front end in the pond MBBR 16 is equipped with external carbon addition device, and spherical suspending biology is added inside the pond MBBR 16 and is filled out Material, the specific gravity of the spherical suspending biologic packing material are 0.92-0.95g/cm3, specific surface area 500-800m2/m3, feed ratio is The 50-70% of pool capacity.
Mud return line 20 is equipped between third sedimentation basin 17 and anoxic pond 14, return sludge ratio is controlled in 50- 100%.
The flotation tank 13, anoxic pond 14, aerobic tank 15, the pond MBBR 16 and the second sedimentation basin 10, third sedimentation basin 17 It is connected with the second sludge-tank 18 simultaneously, 18 rear end of the second sludge-tank is connected with the second sludge filter press 19.
First sludge filter press 6 and the second sludge filter press 19 are connected with collecting-tank 22, the collecting-tank 22 simultaneously The other end connect with comprehensive adjustment pond 11.
As Figure 2-3, the spherical suspending biologic packing material inside the pond MBBR 16, including shell 51 spherical in shape, institute State and be also socketed with the spherosome that can longitudinally rotate 52 in shell 51, be socketed in spherosome 52 can transverse rotation ellipse Body 53；The hole 54 of hollow out is distributed on the shell 51, the aperture 55 of hollow out, the ellipse are distributed on the spherosome 52 Fin 56 is distributed on body 53, through slot 57 is distributed between each fin 56；The shell 51, spherosome 52 and ellipsoid 53 Material is any one of modified polypropene or modified poly ethylene.
A kind of leather waste water processing method, comprising the following steps:
A) it pre-processes: each workshop high-concentration chromium-containing wastewater and low-concentration chromate waste water being separated into individually processing, by high concentration Chromate waste water carries out primary filtration by the first grille well 1, and water outlet enters the first adjusting after excluding agglomerate floater and suspended matter Pond 2, the waste water in the first conditioning tank 2 are lifted into the first reaction tank 3 by elevator pump, are added in the first reaction tank 3 FeSO4And be aerated, while adding NaOH solution, the first sedimentation basin 4 is entered after reaction and is precipitated, is obtained containing chromium processing water and high concentration Mud containing chromium, the supernatant in the first sedimentation basin 4 are discharged into comprehensive adjustment pond 11, and high concentration chromium-bearing sludge enters the first sludge-tank 5；It will Low-concentration chromate waste water carries out primary filtration by the second grille well 7, excludes water outlet after agglomerate floater and suspended matter and enters the Two conditioning tanks 8, the waste water in the second conditioning tank 8 is lifted into the second reaction tank 9 by elevator pump, in the second reaction tank 9 Add FeSO4And be aerated, while adding NaOH solution, after reaction enter the second sedimentation basin 10 precipitate, obtain containing chromium processing water and Low concentration mud containing chromium, the supernatant in the second sedimentation basin 10 are discharged into comprehensive adjustment pond 11, and it is dirty that low concentration chromium-bearing sludge enters second Mud sump 18；
B) coagulation air-float is handled: the waste water in comprehensive adjustment pond 11 is lifted into flotation tank 13, waste water by elevator pump Enter anoxic pond 14 after 13 mud-water separation of flotation tank, two pipe-line mixers 12 be set before flotation tank 13, one add it is mixed Solidifying agent, another adds flocculation aid；
C) A/O biochemical treatment: the water outlet gravity flow of above-mentioned air-flotation process is entered in anoxic pond 14 and is handled, the residence time is 6-8h, the nitrification liquid from aerobic tank 15 flow back into anoxic pond 14, and 15 dwell time of sewage of aerobic tank is 12-16h, nitrification liquid Reflux ratio is controlled in 100-200%；
D) pond MBBR is handled: waste water enters the pond MBBR 16 to continue the pollutant that degradation fails to completely remove, the pond MBBR 16 Dwell time of sewage is 4-6h, and 16 front end of the pond MBBR is arranged external carbon addition device, it is raw that spherical suspending is added inside the pond MBBR 16 Object filler；
E) precipitate: waste water carries out mud-water separation, supernatant qualified discharge in third sedimentation basin 17, and sludge settling gets off, Return sludge ratio is controlled in 50-100%；
F) Treatment of Sludge: the high concentration chromium-bearing sludge that the first sedimentation basin 4 generates enters the first sludge-tank 5, the first sludge-tank 5 Interior supernatant is emitted into collecting-tank, and thickened sludge is squeezed into the first sludge filter press 6 by sludge pump and is carried out dehydrating, the The filtrate that one sludge filter press 6 generates enters collecting-tank, and dangerous waste processing company's profession disposition is transferred to after mud cake desiccation；Second precipitating The low concentration chromium-bearing sludge that pond 10 generates enters the second sludge-tank 18, sludge that flotation tank 13 generates and anoxic pond 14, aerobic The excess sludge that pond 15, the pond MBBR 16, third sedimentation basin 17 generate all enters the second sludge-tank 18, and sludge is in the second sludge-tank 18 After interior concentration, supernatant is emitted into sump, and thickened sludge is squeezed into the second sludge filter press 19 by sludge pump and carried out Dehydration, the filtrate that the second sludge filter press 19 generates enter collecting-tank, and outward transport carries out landfill disposal after mud cake desiccation.
This waste water treatment system is smoothly implemented in Wenzhou Leather Factory waste water treatment engineering project, and system goes out at present Water quality stabilizing reaches the level-one B standard in " urban wastewater treatment firm pollutant emission standard " GB18918-2002.The system Inlet and outlet water water quality situation see the table below: unit: mg/L

Claims (6)

1. a kind of Leather waste water treatment system, it is characterised in that: including pretreatment unit, the coagulation air-float processing list successively penetrated through Member, A/O biochemical treatment unit and the pond MBBR (16) and third sedimentation basin (17),
Wherein pretreatment unit includes high-concentration chromium-containing wastewater processing unit and low-concentration chromate waste water processing unit, the height Concentration chromate waste water processing unit include sequentially connected first grille well (1), the first conditioning tank (2), the first reaction tank (3) with And first sedimentation basin (4), the first sludge-tank (5), the first sludge filter press (6), the low-concentration chromate waste water processing unit packet Include sequentially connected second grille well (7), the second conditioning tank (8), the second reaction tank (9) and the second sedimentation basin (10), first FeSO is equipped on reaction tank (3) and the second reaction tank (9)4Adding of agent mouth and NaOH adding of agent mouth, wherein FeSO4It adds Amount is 0.5-1.0kg/m3, NaOH concentration is 20% solution；
Coagulation air-float processing unit includes sequentially connected comprehensive adjustment pond (11), pipe-line mixer (12) and flotation tank (13), The pipe-line mixer (12) is there are two mouth is added, and one is used for dosing coagulant, another is for adding flocculation aid, wherein mixing The PAC solution that solidifying agent is 5%, the PAM solution that flocculation aid is 0.1%；
A/O biochemical treatment unit includes anoxic pond (14) and aerobic tank (15), while in the water outlet of aerobic tank (15) and anoxic Nitrification liquid return pipe (21) are equipped between the water inlet end in pond (14), diving mixer, aerobic tank are set in anoxic pond (14) (15) external to install blast aeration equipment, inside setting aerating system, in addition in aerobic tank (15) front end, setting liquid alkaline adds dress It sets；
The front end of the pond MBBR (16) is equipped with external carbon addition device, adds spherical suspending biology inside the pond MBBR (16) and fills out Material, the specific gravity of the spherical suspending biologic packing material are 0.92-0.95g/cm3, specific surface area 500-800m2/m3, feed ratio is The 50-70% of pool capacity.
2. Leather waste water treatment system according to claim 1, it is characterised in that: in third sedimentation basin (17) and anoxic pond (14) mud return line (20) are equipped between, return sludge ratio is controlled in 50-100%.
3. Leather waste water treatment system according to claim 1, it is characterised in that: the flotation tank (13), anoxic pond (14), aerobic tank (15), the pond MBBR (16) and the second sedimentation basin (10), third sedimentation basin (17) are connected with the second sludge simultaneously Pond (18), the second sludge-tank (18) rear end are connected with the second sludge filter press (19).
4. Leather waste water treatment system according to claim 1, it is characterised in that: first sludge filter press (6) and Second sludge filter press (19) is connected with collecting-tank (22) simultaneously, the other end of the collecting-tank (22) and comprehensive adjustment pond (11) Connection.
5. Leather waste water treatment system according to claim 1, it is characterised in that: the internal spherical shape of the pond MBBR (16) Suspended biological filler is also socketed with the ball that can longitudinally rotate in the shell (51) including shell (51) spherical in shape Body (52), be socketed in the spherosome (52) can transverse rotation ellipsoid (53)；Hollow out is distributed on the shell (51) The aperture (55) of hollow out is distributed on the spherosome (52), fin (56) are distributed on the ellipsoid (53) for hole (54), Through slot (57) are distributed between each fin (56)；The material of the shell (51), spherosome (52) and ellipsoid (53) is to change Property any one of polypropylene or modified poly ethylene.
6. a kind of leather waste water processing method as claimed in claims 1-5, it is characterised in that: the following steps are included:
Pretreatment: each workshop high-concentration chromium-containing wastewater and low-concentration chromate waste water are separated into individually processing, high concentration is given up containing chromium Water carries out primary filtration by the first grille well (1), and water outlet enters the first conditioning tank after excluding agglomerate floater and suspended matter (2), the waste water in the first conditioning tank (2) is lifted into the first reaction tank (3) by elevator pump, in the first reaction tank (3) Add FeSO4And be aerated, while adding NaOH solution, after reaction enter the first sedimentation basin (4) precipitate, obtain containing chromium processing water and High concentration mud containing chromium, the supernatant in the first sedimentation basin (4) are discharged into comprehensive adjustment pond (11), and high concentration chromium-bearing sludge enters first Sludge-tank (5)；Low-concentration chromate waste water is subjected to primary filtration by the second grille well (7), excludes agglomerate floater and suspension Water outlet enters the second conditioning tank (8) after object, and the waste water in the second conditioning tank (8) is lifted into the second reaction tank by elevator pump (9) in, FeSO is added in the second reaction tank (9)4And be aerated, while adding NaOH solution, the second sedimentation basin is entered after reaction (10) it precipitates, obtains handling water and low concentration mud containing chromium containing chromium, the supernatant in the second sedimentation basin (10) is discharged into comprehensive adjustment pond (11), low concentration chromium-bearing sludge enters the second sludge-tank (18)；
Coagulation air-float processing: the waste water in comprehensive adjustment pond (11) is lifted into flotation tank (13) by elevator pump, waste water warp Enter anoxic pond (14) after crossing flotation tank (13) mud-water separation, two pipe-line mixers (12) of setting before flotation tank (13), one Dosing coagulant, another adds flocculation aid；
A/O biochemical treatment: the water outlet gravity flow of above-mentioned air-flotation process being entered in anoxic pond (14) and is handled, residence time 6- 8h, the nitrification liquid from aerobic tank (15) flow back into anoxic pond (14), and aerobic tank (15) dwell time of sewage is 12-16h, nitre Change the control of liquid reflux ratio in 100-200%；
The processing of the pond MBBR: waste water enters the pond MBBR (16) to continue the pollutant that degradation fails to completely remove, and the pond MBBR (16) are dirty Water retention time is 4-6h, and the pond MBBR (16) front end is arranged external carbon addition device, adds spherical suspending inside the pond MBBR (16) Biologic packing material；
Precipitating: waste water carries out mud-water separation, supernatant qualified discharge in third sedimentation basin (17), and sludge settling gets off, sludge Reflux ratio is controlled in 50-100%；
Treatment of Sludge: the high concentration chromium-bearing sludge that the first sedimentation basin (4) generates enters the first sludge-tank (5), the first sludge-tank (5) Interior supernatant is emitted into collecting-tank, and thickened sludge is squeezed into the first sludge filter press (6) by sludge pump and is carried out dehydrating, The filtrate that first sludge filter press (6) generates enters collecting-tank, and dangerous waste processing company's profession disposition is transferred to after mud cake desiccation；Second The low concentration chromium-bearing sludge that sedimentation basin (10) generates enters the second sludge-tank (18), the sludge and anoxic that flotation tank (13) generates The excess sludge that pond (14), aerobic tank (15), the pond MBBR (16), third sedimentation basin (17) generate all enters the second sludge-tank (18), sludge is after the second sludge-tank (18) interior concentration, and supernatant is emitted into sump, and thickened sludge passes through sludge pump It squeezes into the second sludge filter press (19) to be carried out dehydrating, the filtrate that the second sludge filter press (19) generates enters collecting-tank, mud Outward transport carries out landfill disposal after biscuit.
CN201810754692.7A 2018-07-11 2018-07-11 leather waste water treatment system and method Pending CN109020052A (en)

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