CN109095726B - Reclaimed water recycling system for leather wastewater - Google Patents
Reclaimed water recycling system for leather wastewater Download PDFInfo
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- CN109095726B CN109095726B CN201811146180.9A CN201811146180A CN109095726B CN 109095726 B CN109095726 B CN 109095726B CN 201811146180 A CN201811146180 A CN 201811146180A CN 109095726 B CN109095726 B CN 109095726B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 151
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- 239000002351 wastewater Substances 0.000 title claims abstract description 42
- 238000004064 recycling Methods 0.000 title claims abstract description 23
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Images
Classifications
-
- 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
- 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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Ion Exchange (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The utility model provides a leather waste water reuse of reclaimed water system, belongs to the reuse of reclaimed water field, including pretreatment systems, reaction system, regeneration processing system, and pretreatment systems includes oyster shell filler's A/O biological filter and zeolite filter, and reaction system includes zeolite filler retort and ion exchange tank, and regeneration processing system utilizes processes such as hydrochloric acid soaking regeneration, salt solution soaking regeneration and air water back flush to realize the regeneration of zeolite filler retort and ion exchange tank. The reclaimed water recycling system can further treat the leather wastewater subjected to secondary biochemical treatment until the leather wastewater meets the reclaimed water recycling standard requirement, and can be reused for cleaning workshops and irrigating greenbelts of factories, so that win-win purposes of recycling and emission reduction of the wastewater are realized.
Description
Technical Field
The invention relates to the field of reclaimed water reuse, in particular to a reclaimed water reuse system for leather wastewater.
Background
The industrial production of leather generally comprises the procedures of degreasing, liming for unhairing, softening, tanning, dyeing processing, drying, finishing and the like. Because a plurality of chemical raw materials are used in the leather processing process, the leather processing wastewater contains a plurality of pollutants such as grease, collagen, animal and plant fibers, organic and inorganic solid matters, sulfides, chromium, salts, surfactants, dyes and the like. In the whole leather making process, the salt-pickled leather produces 600-700L of waste water per kilogram, the water quality is different according to the scale of a factory, the type of the original leather and the tanning method, and the defects of complex components, deep chroma, more suspended matters, high oxygen consumption and large water quantity are overcome. The water quality of the leather-making industrial wastewater in China is characterized in that: the pH value is 7-9, the COD is 2000-3000 mg/L, the BOD is 1000-1500 mg/L, the chloride is 2000-3000 mg/L, the sulfate is 1000mg/L, the trivalent chromium is 70-80 mg/L, and the phenol is 5-10 mg/L. With the increasing shortage of water resources and the increasing pollution, the recycling of waste water is becoming more and more important as an important aspect of clean production.
The double-membrane method treatment process is commonly used for recycling water in leather wastewater, the process uses the leather wastewater after biochemical treatment as inlet water, and then adopts a combined process of multi-media filtration, ultrafiltration and reverse osmosis membrane deep treatment, wherein the multi-media filtration removes solid pollutants with larger specific gravity remained in the biochemical process, the ultrafiltration process further removes substances such as micromolecule colloid and the like in the water to ensure the stable operation of the rear-end reverse osmosis process, the reverse osmosis is used as an important means of the deep treatment to ensure that the outlet water meets the recycling requirement, but because of the high content of organic matters, the high salt and the high hardness of the leather wastewater and the like, biological pollution is frequently generated, if the treatment is improper, the reverse osmosis system is seriously polluted and blocked, the performance of the membrane is reduced, and the service life of the membrane.
The UV-Fenton method is used as another method for recycling water in leather wastewater, and compared with a Fenton reagent which is used alone, the introduction of the ultraviolet light can not only obviously accelerate the reaction rate and reduce H2O2The dosage can greatly improve the oxidation performance of the Fenton reagent, has good removal effect on organic pollutants which are difficult to biodegrade or chemically oxidize, has better removal effect on chromaticity by flocculation after treatment, but the cost of the agent for treating the soil art is as high as 8.98 yuan/ton, and limits the popularization and application of the agent.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a reclaimed water recycling system for leather wastewater, which has the advantages of stable operation, high treatment rate, less occupied area, high efficiency, capability of meeting recycling standards of effluent and the like, can be used as water for cleaning production workshops and greening plant areas, and realizes win-win purposes of recycling wastewater and reducing emission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a reclaimed water recycling system for leather wastewater comprises a reclaimed water pool, a pretreatment system, a reaction system and a regeneration treatment system;
the pretreatment system comprises an anoxic/aerobic biological filter, a final sedimentation tank and a zeolite filter; the output end of the anoxic/aerobic biofilter is connected with the input end of the final sedimentation tank through a pipeline, and the output end of the final sedimentation tank is connected with the input end of the zeolite filter through a pipeline;
the reaction system comprises a zeolite filler reaction tank and an ion exchange tank; the input end of the zeolite filler reaction tank is connected with the output end of the zeolite filter tank through a pipeline, the input end of the ion exchange tank is connected with the output end of the zeolite filler reaction tank through a pipeline, and the output end of the ion exchange tank is connected with the reclaimed water tank through a pipeline;
the regeneration treatment system comprises a blower, a back flush pump, a hydrochloric acid regeneration liquid tank and a hydrochloric acid delivery pump; the blower is connected with the zeolite filler reaction tank; the input end of the back flushing pump is connected with the middle water tank, and the output end of the back flushing pump is connected with the zeolite filler reaction tank; the hydrochloric acid regeneration liquid tank is connected with the zeolite filler reaction tank through a hydrochloric acid delivery pump.
The regeneration treatment system also comprises a brine regeneration liquid tank and a brine delivery pump, wherein the brine regeneration liquid tank is connected with the ion exchange tank through the brine delivery pump; the output end of the back washing pump and the blower are also connected with the ion exchange tank.
The output end of the back washing pump and the air blower are also connected with the zeolite filter tank.
The anoxic/aerobic biofilter is an anoxic/aerobic biofilter filled with oyster shells, and comprises a plurality of anoxic biofilters and a plurality of aerobic biofilters which are sequentially connected in series for operation.
The reaction system also comprises an ozone generator, and the ozone generator is connected with the zeolite packing reaction tank through a pipeline.
The pretreatment system further comprises a sludge concentration tank and a sludge pump, wherein the sludge concentration tank is connected with the final sedimentation tank through the sludge pump.
The zeolite packing reaction tank is internally provided with double layers of zeolite packing, the bottom of each layer of zeolite packing is paved with a cobble layer, the particle size of the zeolite is 0.5-1.5 mm, the particle size of cobbles is 10-30 mm, the thickness of the zeolite packing layer is 700-1000 mm, and the thickness of the cobble layer is 60-80 mm; a cation exchange resin layer is arranged in the ion exchange tank, the particle size of the cation exchange resin is 0.5-1 mm, and the thickness of the cation exchange resin layer is 1500-2000 mm.
A method for recycling water in leather wastewater comprises the following steps:
and 4, conveying the water treated by the ion exchange tank to a reclaimed water pool.
The method also comprises the following steps before the step 1: the anoxic/aerobic biofilter adopts secondary biochemical activated sludge of a leather wastewater treatment facility as inoculation sludge, the concentration of the inoculation sludge is 1000-1500 mg/L, and after inoculation, the leather wastewater subjected to secondary biochemical treatment is continuously introduced after stuffy aeration is carried out for 2-3 days; the period of film formation is 2-4 weeks, the biological film culture condition of the anoxic/aerobic biological filter tank is aeration operation, and when the biological film is mature, the anoxic biological filter tank is switched to non-aeration operation.
The invention also comprises a regeneration treatment step of the zeolite filler reaction tank, which comprises the following steps:
The invention also comprises a step of regeneration treatment of the ion exchange tank, comprising:
The regenerated waste liquid generated in the regeneration process is discharged into a regulating reservoir of the leather wastewater treatment facility through a pipeline.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention is based on the water quality characteristics of the leather wastewater, takes the leather wastewater subjected to secondary biochemical treatment as raw water, integrates a pretreatment system, a reaction system and a regeneration treatment system, has the advantages of stable operation, high treatment rate, less occupied area, high efficiency, capability of meeting the reuse standard of effluent and the like, can be used as water for cleaning production workshops and greening plant areas, and realizes win-win purposes of wastewater recycling and emission reduction.
2. The pretreatment system consists of an anoxic/aerobic (A/O) biological filter tank, a final sedimentation tank and a zeolite filter tank, wherein fillers of the anoxic/aerobic biological filter tank are all marine culture waste oyster shells, and are inoculated and started by secondary biochemical activated sludge of a leather wastewater treatment facility, so that the anoxic/aerobic biological filter tank has treatment functions of organic matter oxidation, nitrification, denitrification, biological phosphorus removal and the like, the final sedimentation tank separates micro suspended matters, and the zeolite filter tank intercepts and removes the micro suspended matters, colloidal particles, biological flocs and the like in water, so that the blockage of a filler layer in a subsequent zeolite filler reaction tank is prevented, and meanwhile, part of hardness in exchange water can be absorbed.
3. The reaction system comprises a zeolite filler reaction tank and an ion exchange tank, wherein the zeolite particles in the zeolite filler reaction tank remove ammonia nitrogen, metal ions and the like in water through ion exchange action, ozone is introduced into the reaction tank, the COD which is difficult to degrade in the water can be removed by using the strong oxidizing property of the ozone, decolorization, sterilization and the like, calcium, magnesium and some heavy metal ions in the water are removed through ion exchange reaction in the ion exchange tank, so that the deep removal of pollutants such as salinity, hardness, chromaticity, residual COD, ammonia nitrogen, phosphorus and the like is realized, and the effluent meets the water reuse standard in the leather industry.
4. The regeneration treatment system realizes effective regeneration of the zeolite filler and the ion exchange resin by using procedures of hydrochloric acid soaking regeneration, brine soaking regeneration, air-water backwashing and the like.
Drawings
FIG. 1 is a process flow diagram of the present invention;
fig. 2 is a schematic structural diagram of a reclaimed water reuse system.
Reference numerals: leather wastewater 1 subjected to secondary biochemical treatment, an anoxic/aerobic biological filter 2, a reflux water pump 3, a final sedimentation tank 4, sludge pumps 5-1#, 5-2#, a sludge concentration tank 6, a screw pump 7, a sludge filter press 8, blowers 9-1#, 9-2#, water inlet pumps 10-1#, 10-2#, 10-3#, a zeolite filter 11, a hydrochloric acid delivery pump 12, a hydrochloric acid regeneration liquid tank 13, a zeolite filler reaction tank 14, an ozone generator 15, an intermediate water tank 16, a brine delivery pump 17, a brine regeneration liquid tank 18, an ion exchange tank 19, a drainage open ditch 20, a backwashing pump 21, an intermediate water tank 22, a lifting pump 23, valves 2-1#, 2-2#, 2-3#, 2-4#, 2-5#, 2-6#, 2-7#, 2-8#, a water outlet pump, 2-9#, 2-10#, 2-11#, 2-12#, 2-13#, 2-14#, 2-15#, 2-16#, 2-17#, 2-18#, 2-19#, 2-20#, 2-21#, 2-22#, 2-23#, 2-24#, 2-25#, 2-26#, 2-27#, 2-28#, 2-29#, 2-30#, 2-31#, 2-32 #.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects of the present invention clearer, the present invention is described in further detail below with reference to the accompanying drawings and embodiments.
As shown in fig. 1 and 2, the embodiment of the present invention is provided with a pretreatment system, a reaction system, a regeneration treatment system, and a middle water tank.
The pretreatment system comprises an anoxic/aerobic biological filter tank 2, a final sedimentation tank 4, a sludge concentration tank 6, a sludge pump 5-2# and a zeolite filter tank 11; the reaction system comprises a zeolite filler reaction tank 14, an ozone generator 15, an intermediate water tank 16 and an ion exchange tank 19; the regeneration treatment system comprises a blower 9-1#, a blower 9-2#, a back flush pump 21, a hydrochloric acid regeneration liquid tank 13, a hydrochloric acid delivery pump 12, a brine regeneration liquid tank 18 and a brine delivery pump 17.
The anoxic/aerobic biofilter 2 is connected with the input end of the final sedimentation tank 4, the output end of the final sedimentation tank 4 is connected with the zeolite filter tank 11, and the sludge concentration tank 6 is connected with the final sedimentation tank 4 through a sludge pump 5-2 #; the zeolite filler reaction tank 14 is connected with the output end of the zeolite filter 11, and the ozone generator 15 is connected with the zeolite filler reaction tank 14; an intermediate water pool 16 is arranged between the ion exchange tank 19 and the zeolite filler reaction tank 14, and the output end of the ion exchange tank 19 is connected with an intermediate water pool 22; the blower 9-2# is connected with the zeolite filter 11, the zeolite filler reaction tank 14 and the ion exchange tank 19, and the blower 9-1# is connected with the anoxic/aerobic biofilter 2; the input end of the back washing pump 21 is connected with the middle water tank 16, and the output end of the back washing pump 21 is connected with the zeolite filter tank 11, the zeolite filler reaction tank 14 and the ion exchange tank 19; the hydrochloric acid regeneration liquid tank 13 is connected with the zeolite filler reaction tank 14 through a hydrochloric acid delivery pump 12; the brine regeneration liquid tank 18 is connected with the ion exchange tank 19 through the brine transfer pump 17.
The anoxic/aerobic biofilter 2 comprises 3 anoxic biofilters (called A pool for short) and 2 aerobic biofilters (called O pool for short) which are operated in series, namely an A1 pool, an A2 pool, an A3 pool, an O1 pool and an O2 pool; establish double-deck filler support in 3A ponds and 2O ponds to guarantee even gas distribution and prevent that the filler layer from blockking, adopt abandonment oyster shell for filling, the oyster shell is packed into 5 ~ 10 liters of net bags, and the even shop of net bag is on the support, and the oyster shell layer thickness is about 500 ~ 700 mm.
The matched equipment of the pretreatment system also comprises an air blower 9-1#, a reflux water pump 3, a sludge pump 5-1#, a screw pump 7 and a sludge filter press 8, the water reflux and the sludge reflux of the O tank are realized through the reflux water pump 3 and the sludge pump 5-1#, the aeration is carried out on the O1 tank and the O2 tank in the operation stage, the bottoms of the A tank and the O tank are both provided with aeration heads, and the aeration heads in the A tank are only used when a packing layer blocked by suspended solids is eliminated.
Supernatant in the final sedimentation tank 4 is sent into a zeolite filter 11 through a water inlet pump 10-1# to filter small particle suspended flocs, settled sludge in the final sedimentation tank 4 is sent to a sludge concentration tank 6 through a sludge pump 5-2# at the bottom, and is transported outside after being dehydrated by a sludge filter press 8.
The zeolite filter 11 is mainly made of stainless steel, the filler is zeolite, the particle size of the zeolite is 0.5-1.5 mm, the thickness of the filler layer is 800mm, cobblestones with the particle size of 10-30 mm are paved at the bottom, and the thickness of the cobblestones is 60-80 mm.
The zeolite filler reaction tank 14 is made of epoxy resin (capable of preventing ozone corrosion), double layers of zeolite filler are arranged in the zeolite filler reaction tank, the interlayer spacing is 150-200 mm, a cobble layer is laid at the bottom of each layer of zeolite filler, the particle size of zeolite is 0.5-1.5 mm, the particle size of cobble is 10-30 mm, the thickness of the zeolite filler layer is 700-1000 mm, and the thickness of the cobble layer is 60-80 mm.
The main material of the ion exchange tank 19 is epoxy resin, a cation exchange resin layer is arranged in the ion exchange tank 19, the particle size of the resin is 0.5-1 mm, and the thickness of the resin layer is 1500-2000 mm;
the ozone generator 15 supplies ozone to the zeolite filler reaction tank 14, decomposes pigments by using the strong oxidizing property of ozone, degrades residual COD, and kills germs.
The starting biofilm formation method of the O pool and the A pool comprises the following steps: inoculating and starting secondary biochemical activated sludge of the leather wastewater treatment facility, wherein the concentration of the inoculated sludge is 1000-1500 mg/L, continuously introducing water into a secondary biochemical treatment system after aeration for 2-3 d, and then continuously adding for 3-4 times in a week unit, thus finishing the starting operation. The period of film formation is 2-4 weeks. And (3) carrying out aeration operation on the biomembrane culture conditions of the O pond and the A pond, switching the aeration operation of the A pond into bottom plug flow slurry operation when the biomembrane is mature, and setting the circulation ratio from the O pond to the A pond to be 0.5-1.0. The aeration intensity can be adjusted by adjusting the control valve of the aeration pipe according to the change conditions of the inflow load and the concentration of dissolved oxygen in the tank.
The working steps of the invention are as follows:
1. leather wastewater 1 after secondary biochemical treatment sequentially enters A1, A2 and A3 pools, then enters O1 pool and O2 pool, and the air supply valves 2-1#, the valves 2-2# and the valves 2-4# of 3A pools are closed (only opened in a back washing process); the control valve 2-3# of the blower 9-1#, the air supply valve 2-5# of the O1 pool and the air supply valve 2-6# of the O2 pool are set to be opened, the blower 9-1# is operated to send compressed air into the O1 pool and the O2 pool respectively, a small part of liquid in the O2 pool is refluxed to the A1 pool by the reflux water pump 3, a large part of liquid is overflowed to the final sedimentation pool 4, and a part of precipitated sludge is refluxed to the A1 pool by the sludge pump 5-1 #. The valve 2-7# is opened intermittently, partial precipitated sludge can be conveyed to the sludge concentration tank 6 by the sludge pump 5-2#, and the concentrated sludge is conveyed to the sludge filter press 8 by the screw pump 7 for dehydration treatment. The valve 2-8# is set to be opened, and the supernatant of the final sedimentation tank 4 is conveyed to the zeolite filter tank 11 through a water inlet pump 10-1 #.
2. Three device operation treatment stages of a zeolite filter 11, a zeolite filler reaction tank 14 and an ion exchange tank 19: valves 2-12# and 2-20# and 2-22# and 2-29# are all set to be opened, valves 2-9#, 2-10#, 2-11# (special for backwashing of the zeolite filter), valves 2-13#, 2-14#, 2-16#, 2-18#, 2-19# (special for backwashing of the zeolite filler reaction tank), valves 2-23#, 2-24#, 2-25#, 2-27#, and 2-30# (special for backwashing of the ion exchange tank) are set to be closed, and valves 2-15# and 2-28# of the sampling port are closed.
3. The effluent of the final sedimentation tank 4 enters the upper part of the zeolite filter tank 11 through a water inlet pump 10-1#, the treated water of the zeolite filter tank 11 is firstly sent to the bottom of the zeolite filler reaction tank 14 through a water inlet pump 10-2#, meanwhile, valves 2-21# (air inlet valves) and 2-17# (exhaust valves) are opened, the ozone generator 15 is started to operate to fill ozone into the zeolite filler reaction tank 14, the treated water overflows from the upper part of the zeolite filler reaction tank 14 and is discharged into the intermediate water tank 16, then the treated water is sent to the bottom of the ion exchange tank 19 through the water inlet pump 10-3#, meanwhile, the valves 2-17# (exhaust valves) are closed, the ion exchange treated water overflows from the upper part and is discharged into the intermediate water tank 22 and is stored in the intermediate water tank 22, the lifting pump 23 is.
Description of the operation of the backwash stage of each apparatus:
1. backwashing operation of the A1 pool, the A2 pool, the A3 pool, the O1 pool and the O2 pool:
after the filling materials in the A1 pool, the A2 pool, the A3 pool, the O1 pool and the O2 pool run for a period of time, the filling materials are blocked due to the continuous accumulation of biological membranes, the interception of impurities in sewage and other reasons, the contact of microorganisms attached to the surfaces of the oyster shell filling materials with pollutants and oxygen is influenced, the gas backwashing is needed, and the operation method comprises the following steps:
(1) firstly, setting valves 2-1#, valves 2-2#, and valves 2-4# of an A1 pool, an A2 pool, and an A3 pool to be in an open state, setting valves 2-5# and valves 2-6# of an O1 pool and an O2 pool to be in a closed state, opening the valves 2-3# to operate an air blower 9-1#, performing strong air quantity back flushing on fillers of an A1 pool, an A2 pool, and an A3 pool for 15-20 min, stopping operating the air blower 9-1#, and then setting the valves 2-1#, valves 2-2#, and valves 2-4# of the A1 pool, the A2 pool, and the A3 pool to be in a closed state;
(2) opening valves 2-5# and 2-6# of the O1 pool and the O2 pool, operating a blower 9-1# and performing strong air quantity backwashing on the fillers of the O1 pool and the O2 pool respectively; the falling biological film generated in the whole back washing process is discharged into a sludge concentration tank 6 as the precipitated sludge of the final sedimentation tank 4 for treatment.
2. Back flushing operation of the zeolite filter 11:
when the zeolite filter tank is blocked, air-water backwashing can be adopted to remove dirt in the filter material, and the operation method comprises the following steps:
(1) and (3) air washing stage: opening valves 2-9# and 2-11#, closing valves 2-10#, 2-12#, 2-13#, and 2-23#, starting an air blower 9-2# to perform strong air quantity back flushing on the zeolite filter material layer for 15-20 min, and performing water washing after the air washing is finished.
(2) And (3) water washing stage: opening valves 2-10# and 2-31#, closing valves 2-9#, 2-13# and 2-23# (all air inlet valves) and 2-16# and 2-24# (the zeolite filler reaction tank 14 and the back-flushing water inlet valve of the ion exchange tank 19), starting a back-flushing pump 21, enabling back-flushing water from a middle water tank 22 to flow through the lower part to the upper part of the zeolite filter layer, overflowing and discharging the eluted suspended matters into a water discharging open ditch 20, and finally discharging into a regulating reservoir of a leather wastewater treatment facility to be treated together with raw water of leather wastewater.
3. Operation of the zeolite filler reaction tank 14 in the back flushing and regeneration stage:
the first time of air-water back washing, the fallen microorganisms are driven away, and the surface of the zeolite is cleaned; then hydrochloric acid soaking is carried out, calcium ions, magnesium ions, sodium ions and other ions combined with the zeolite are replaced by hydrogen ions, the ion exchange capacity of the zeolite is recovered, finally, second air-water backwashing is carried out, hydrochloric acid liquid on the surface of the zeolite is cleaned, and the pH value in the tank is recovered to be neutral. The specific operation method comprises the following steps:
(1) and (3) air washing stage: opening valves 2-13#, 2-17# and 2-19#, closing valves 2-9#, 2-12#, 2-14#, 2-16#, 2-18#, and 2-20#, starting an air blower 9-2# to perform strong air quantity back flushing on the zeolite filter material layer for 15-20 min, and performing water washing after the air washing is finished.
(2) And (3) water washing stage: opening valves 2-16#, 2-31# and 2-19#, closing valves 2-12#, 2-13#, 2-14#, 2-18#, 2-20#, and 2-10# and 2-24# (back-flushing water inlet valves of zeolite filter tank 11 and ion exchange tank 19), starting back-flushing pump 21, making the back-flushing water from middle water tank 22 flow through lower portion to upper portion of zeolite filler reaction tank 14, and making the washed suspended matter overflow and discharge into water-discharging open drain 20, finally discharging into regulating tank of leather waste water treatment equipment.
(3) A regeneration stage: adopting hydrochloric acid soaking regeneration operation, firstly opening a drain valve 2-18# and an exhaust valve 2-17# to completely discharge reaction liquid in the zeolite filler reaction tank 14, then closing the drain valve 2-18#, keeping the valves 2-12#, 2-13#, 2-19#, and 2-20# in a closed state, opening the 2-14#, starting a hydrochloric acid delivery pump 12, filling the zeolite filler reaction tank 14 with hydrochloric acid regeneration liquid for 1-2 h, after regeneration is completed, opening the valves 2-18#, completely discharging the regeneration liquid in the zeolite filler reaction tank 14, and then closing the drain valve 2-18 #; the wastewater or waste liquid discharged from the valve 2-18# of the drainage valve passes through the open drainage ditch 20 and is finally discharged into the regulating reservoir of the leather wastewater treatment facility.
(4) And finally, performing primary water backwashing operation, wherein the process is the same as the primary water backwashing operation, and finally recovering the normal pH value in the tank.
4. Operation of the ion exchange tank 19 in the backwashing and regeneration stage: when the ion exchange tank is used for a certain time, the resin exchange sites are saturated, and resin regeneration is needed at the time, and the specific operation method is as follows:
(1) and (3) air washing stage: and (3) opening valves 2-23#, 2-26# and 2-30#, closing valves 2-9#, 2-13#, 2-22#, 2-24#, 2-25#, 2-27# and 2-29#, starting an air blower 9-2# to perform strong air quantity back washing on the ion exchange resin layer for 15-20 min, and performing water washing after the air washing is finished.
(2) And (3) water washing stage: opening valves 2-24#, 2-31# and 2-30#, setting valves 2-22#, 2-23#, 2-25#, 2-27# and 2-29#, and 2-10# and 2-16# (back-flushing water inlet valves of zeolite filter tank 11 and zeolite filler reaction tank 14) to be in a closed state, starting back-flushing pump 21, making the back-flushing water from middle water tank 22 flow through the lower part to the upper part of ion exchange tank 19, overflowing eluted suspended matters and discharging into water discharge open ditch 20, and finally discharging into regulating tank of leather wastewater treatment facility.
(3) A regeneration stage: adopting saline water soaking regeneration operation (saline water is saturated salt water), firstly opening drain valve 2-27# and exhaust valve 2-26# to drain reaction liquid in the ion exchange tank 19, then closing valve 2-27#, keeping valves 2-22#, 2-23#, 2-24# and 2-29# in a closed state, opening valve 2-25#, starting a saline water delivery pump 17 to fill the ion exchange tank 19 with saline water regeneration liquid, wherein the saline water regeneration liquid soaking time is 1-2 h, after regeneration is finished, opening drain valve 2-27# to drain saline water in the ion exchange tank 19, and then closing drain valve 2-27 #; the discharged wastewater or waste liquid through the valves 2-27# passes through the open drain 20 and finally is discharged into the regulating reservoir of the leather wastewater treatment facility.
(4) And finally, performing primary water back washing operation to clean the salt water attached to the surface of the ion exchange resin, wherein the process is the same as the primary water back washing operation.
The following is that the water inlet load of the embodiment is 400-500 m when the embodiment is used for treating the leather wastewater of practical secondary biochemical treatment3The test conditions are as follows:
1) when the oyster shell biological aerated filter is aerated, the dissolved oxygen is 4-6 mg/L, the pH value is 7.0-7.5, and the hydraulic retention time is 12-48 h;
2) the filtering speed of the zeolite filter is 0.71-0.89 m/h, and the back washing strength is 4-15L/(s.m)2) The back washing pump operates for 5-7 min;
3) the filtering speed of the zeolite filler reaction tank is 8-10 m/h, and the backwashing strength is 4-15L/(s.m)2) The back washing pump operates for 5-7 min; the ozone output of the ozone generator is 250-800 g/h, and the ozone concentration of the reaction liquid in the zeolite filler reaction tank is controlled to be 0.5-1.5 mg/L.
4) The filtration speed of the ion exchange tank is 8-10 m/h, and the backwashing strength is 4-15L/(s.m)2) And the back washing pump operates for 5-7 min.
TABLE 1
The dimensions of the various structures in the embodiments of the present invention are shown in table 1. The pre-treatment system occupies about 33.0m multiplied by 29.0 m-957 m2The reaction system and the regeneration system are arranged adjacently, and the floor area is about 15.0m multiplied by 20.0 m-300 m2。
TABLE 2
| Analysis index | Water from main outlet | Total effluent of reclaimed water reuse system |
| Hardness (mg/L) | 405.4 | 4 |
| pH | 7.73 | 7.68 |
| Color intensity | 80 | 20 |
| Smelling medicine | No unpleasant feeling | No unpleasant feeling |
| Suspended substance (mg/L) | 1400 | 5 |
| Turbidity (NTU) | 0.79 | 0.53 |
| Soluble Total solids (mg/L) | 8.78 | 5 |
| CODCr(mg/L) | 99 | 28 |
| Ammonia nitrogen (mg/L) | 1.40 | 0.01 |
| Iron (mg/L) | 0.02 | 0.01 |
| Manganese (mg/L) | 0.061 | 0.003 |
| Total nitrogen (mg/L) | 9.55 | 6.10 |
| Total phosphorus (mg/L) | 1.02 | 0.07 |
| Total chromium (mg/L) | 0.015 | 0.0035 |
| Sulfide (mg/L) | 0.03 | 0 |
| Total coliform group (per/L) | 500 | 3 |
Table 2 reflects the results of the running experiments of this example. It can be seen that after the leather wastewater subjected to secondary biochemical treatment is treated by the reclaimed water recycling system, the removal rate of hardness, ammonia nitrogen, total phosphorus, sulfide and total manganese reaches over 90 percent, and the effluent meets the quality requirement of recycled water in the leather-making industry.
The working principle of the invention is as follows:
1. the biological filter technology integrates biological oxidation and suspended solid interception, and has the characteristics of high volume load, short hydraulic retention time, low investment, small occupied area, good effluent quality, high biological concentration, simple management and the like; the anoxic/aerobic biofilter process is suitable for simultaneously removing organic matters, nitrogen and phosphorus in sewage. The oyster shell waste not only has a rough surface suitable for biological growth and is beneficial to the attachment of nitrobacteria with slow proliferation, but also is rich in CaCO3Can generate Ca in the acidification environment of COD2+Can be combined with PO4 3-And the chemical phosphorus removal is realized by combining and forming a precipitate. In addition, the filter material can also provide alkalinity for the nitrification process of biological denitrification, so that the filter material is the best choice for the anoxic/aerobic biofilter filler, the cost of alkalinity medicament can be saved, and oyster shells can be greatly utilized.
2. The operation of the zeolite filter tank can be divided into two relatively independent and simultaneous processes of raw water filtration and filter material cleaning and regeneration, the two processes are completed in the same filter, the former process is powered by a high potential difference or a pump, and the latter process is completed by high-pressure air-water backwashing. The raw water filtration is to use zeolite as a filter medium, filter water with high pollutant content through granular or non-granular zeolite with a certain thickness under a certain pressure, effectively intercept and remove suspended substances, colloidal particles, biological floc, partial metal ions and the like in the water, and finally achieve the effect of purifying the water quality. When the filter material layer is blocked due to long-term use, the filtering capacity is recovered through air-water backwashing.
3. The adsorption of zeolite molecular sieve is a physical change process, and the adsorption is mainly caused by the surface force generated by molecular attraction acting on the surface of solid, when fluid flows through, some molecules in the fluid collide the surface of adsorbent due to irregular movement, and molecular concentration is generated on the surface, so that the number of the molecules in the fluid is reduced, and the separation and removal purposes are achieved. Ion exchange of a zeolitic molecular sieve refers to the exchange of compensating cations outside of the framework of the zeolitic molecular sieve. The compensating ions outside the framework of the zeolitic molecular sieve are typically protons and alkali or alkaline earth metals, which are readily ion-exchanged in an aqueous solution of a metal salt to form the various valence states of the metal ion zeolitic molecular sieve.
4. The oxidation-reduction potential of the ozone is 2.07V, the ozone is a strong oxidant and disinfectant, and has the functions of sterilization, decoloration and the like, so that harmful microorganisms in the leather wastewater can be killed, and the chromaticity of the leather wastewater is reduced through decoloration. In addition, considering that ozone is unstable in an aqueous solution, the concentration of ozone decreases with the time of standing when the aqueous solution in which ozone is dissolved is left, and the residual concentration in water is low, so that the ozone-dissolving water is suitable for reuse of reclaimed water.
5. The ion exchange resin can remove various impurity ions in the water by utilizing the principle of ion exchange, and can simultaneously remove hardness, various heavy metal ions and the like.
Claims (8)
1. The utility model provides a leather waste water reuse of reclaimed water system which characterized in that: comprises a reclaimed water tank, a pretreatment system, a reaction system and a regeneration treatment system;
the pretreatment system comprises an anoxic/aerobic biological filter, a final sedimentation tank and a zeolite filter; the output end of the anoxic/aerobic biofilter is connected with the input end of the final sedimentation tank through a pipeline, and the output end of the final sedimentation tank is connected with the input end of the zeolite filter through a pipeline;
the reaction system comprises a zeolite filler reaction tank and an ion exchange tank; the input end of the zeolite filler reaction tank is connected with the output end of the zeolite filter tank through a pipeline, the input end of the ion exchange tank is connected with the output end of the zeolite filler reaction tank through a pipeline, and the output end of the ion exchange tank is connected with the reclaimed water tank through a pipeline;
the regeneration treatment system comprises a blower, a back flush pump, a hydrochloric acid regeneration liquid tank and a hydrochloric acid delivery pump; the blower is connected with the zeolite filler reaction tank; the input end of the back flushing pump is connected with the middle water tank, and the output end of the back flushing pump is connected with the zeolite filler reaction tank; the hydrochloric acid regeneration liquid tank is connected with the zeolite filler reaction tank through a hydrochloric acid delivery pump;
the regeneration treatment system also comprises a brine regeneration liquid tank and a brine delivery pump, wherein the brine regeneration liquid tank is connected with the ion exchange tank through the brine delivery pump; the output end of the back washing pump and the blower are connected with the ion exchange tank.
2. The leather wastewater reclaimed water recycling system of claim 1, characterized in that: and the output end of the back washing pump and the air blower are connected with the zeolite filter tank.
3. The leather wastewater reclaimed water recycling system of claim 1, characterized in that: the anoxic/aerobic biofilter is an anoxic/aerobic biofilter filled with oyster shells, and comprises a plurality of anoxic biofilters and a plurality of aerobic biofilters which are sequentially connected in series for operation.
4. The leather wastewater reclaimed water recycling system of claim 1, characterized in that: the reaction system also comprises an ozone generator, and the ozone generator is connected with the zeolite packing reaction tank through a pipeline.
5. The leather wastewater reclaimed water recycling system of claim 1, characterized in that: the pretreatment system further comprises a sludge concentration tank and a sludge pump, wherein the sludge concentration tank is connected with the final sedimentation tank through the sludge pump.
6. A method for recycling leather wastewater reclaimed water is characterized by comprising the following steps: the method comprises the following steps:
step 1, the leather wastewater subjected to secondary biochemical treatment sequentially enters a plurality of anoxic biological filters and a plurality of aerobic biological filters, then liquid flowing out of the aerobic biological filters overflows to a final sedimentation tank, supernatant of the final sedimentation tank is sent to a zeolite filter by a water inlet pump, and partial sediment in the final sedimentation tank is sent to a sludge concentration tank by a sludge pump;
step 2, conveying the water treated by the zeolite filter tank to a zeolite filler reaction tank by a water inlet pump, and then starting an ozone generator to charge ozone into the zeolite filler reaction tank;
step 3, conveying the water treated by the zeolite filler reaction tank to an ion exchange tank by a water inlet pump;
step 4, conveying the water treated by the ion exchange tank to a reclaimed water pool;
the method also comprises the following steps before the step 1: the anoxic/aerobic biofilter adopts secondary biochemical activated sludge of a leather wastewater treatment facility as inoculation sludge, the concentration of the inoculation sludge is 1000-1500 mg/L, and after inoculation, the leather wastewater subjected to secondary biochemical treatment is continuously introduced after stuffy aeration is carried out for 2-3 days; the period of film formation is 2-4 weeks, the biological film culture condition of the anoxic/aerobic biological filter tank is aeration operation, and when the biological film is mature, the anoxic biological filter tank is switched to non-aeration operation.
7. The method for recycling the leather wastewater reclaimed water according to claim 6, which is characterized in that: also comprises a regeneration treatment step of the zeolite filler reaction tank, which comprises the following steps:
step 1, opening a blower and a back washing pump, and performing air-water back washing on a zeolite filler reaction tank;
step 2, closing the air blower and the back flush pump, opening the hydrochloric acid delivery pump, and delivering the hydrochloric acid in the hydrochloric acid regeneration liquid tank into the zeolite filler reaction tank;
and 3, closing the hydrochloric acid delivery pump, and opening the backwashing pump again for water backwashing after hydrochloric acid is soaked and discharged.
8. The method for recycling the leather wastewater reclaimed water according to claim 6, which is characterized in that: also comprises a regeneration treatment step of the ion exchange tank, comprising the following steps:
step 1, opening a blower and a backwashing pump, and performing air-water backwashing on an ion exchange tank;
step 2, turning off the blower and the back washing pump, turning on the brine conveying pump, and conveying the brine in the brine regeneration liquid tank into the ion exchange tank;
and 3, closing the saline water delivery pump, and opening the backwashing pump again for water backwashing after the saline water is soaked and discharged.
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