CN111003899A - Treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry - Google Patents

Treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry Download PDF

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CN111003899A
CN111003899A CN201911373487.7A CN201911373487A CN111003899A CN 111003899 A CN111003899 A CN 111003899A CN 201911373487 A CN201911373487 A CN 201911373487A CN 111003899 A CN111003899 A CN 111003899A
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water
tank
effluent
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wastewater
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王永广
苏航
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Yangzhou University
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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
    • 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
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • 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
    • 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
    • C02F1/722—Oxidation by peroxides
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • 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
    • C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2305/00—Use of specific compounds during water treatment
    • C02F2305/02—Specific form of oxidant
    • C02F2305/026—Fenton's reagent
    • 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

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  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
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  • Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract

A treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry, and relates to a treatment and recycling process of industrial wastewater. The invention provides a treatment technology taking aerobic biochemical treatment and Fenton oxidation as main processes, which can lead polyacrylate slurry in water-jet weaving wastewater to be inorganic, effectively remove organic and inorganic pollutants in the wastewater, lead the treated effluent to be used as reclaimed water and be reused for water-jet of a weaving machine, realize zero emission of water-jet weaving wastewater treatment and ensure that the reuse rate of the reclaimed water is 100 percent.

Description

Treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry
Technical Field
The invention relates to a treatment and recycling process of industrial wastewater, in particular to a treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry.
Background
The water jet loom is one of chemical fiber production equipment with the highest use popularization rate in the filament weaving industry in China. In the production process, a large amount of fresh water sources are consumed by the water-jet loom, and meanwhile, as lubricating grease and polyacrylate pulp are used in the weaving process, the COD and SS content in the produced waste water is high, and the treatment of the water-jet weaving waste water is effectively carried out.
As a chemical synthesis slurry, polyacrylate is a homopolymer or a copolymer taking acrylate as a monomer, belongs to a high molecular organic polymer which is difficult to degrade biologically, the COD is very high, the treatment effect of the conventional physical and chemical method is very little, and the removal rate of the COD is only below 12%; if the polyacrylate is discharged into the natural environment without effective treatment, a large amount of foam can be generated in the discharged water body, continuous environmental pollution can be caused due to continuous accumulation of the polyacrylate in the water body, the ecological environment is seriously damaged, and the propagation and growth of aerobic microorganisms in the water body are influenced.
At present, the relatively mature water-jet weaving wastewater treatment technology in China mainly takes physical and chemical methods such as air flotation, filtration and the like as main methods, and cannot effectively remove polyacrylate in wastewater; the unpopular reclaimed water recycling technology mainly adopts ion exchange and electrodialysis, and the existence of polyacrylate directly interferes with the stable operation of the reclaimed water recycling process.
The environmental protection aims of zero waste water discharge and 100% reclaimed water reuse rate are provided in the filament weaving industry by taking green economy as development guide, and the technical development and application in the aspects of waste water treatment and reuse of the water-jet loom by taking a biochemical method as a main process are hot spots in the next years.
Disclosure of Invention
Aiming at the treatment and recycling of the water-jet weaving wastewater, the invention provides a treatment technology taking aerobic biochemical treatment and Fenton oxidation as main processes, namely a treatment and recycling process of the water-jet weaving wastewater containing polyacrylate slurry, which can effectively make the polyacrylate slurry in the wastewater inorganic, remove organic and inorganic pollutants in the wastewater, and ensure that the water quality of the treated effluent can meet the water quality requirement of a water-jet loom and the recycling rate of the reclaimed water is 100%.
The technical scheme of the invention is as follows:
a treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry is characterized by comprising the following steps:
1) the wastewater discharged from a water jet loom workshop automatically flows into an oil separation tank buried underground by gravity, and floating oil and floating slag with specific gravity smaller than that of water contained in the wastewater are removed;
2) the effluent of the oil separation tank flows into an adjusting tank buried underground by gravity; the effluent of the regulating tank is pumped to the air floatation tank by a sewage lifting pump arranged at the bottom of the tank;
3) the horizontal direction is along the water flow, and 4 areas of a mixed flocculation area, a dissolved air release area, a flotation area and a water outlet area are sequentially arranged in the air flotation tank; adding a composite coagulant into the mixed flocculation area, and capturing suspended impurities, oils, Ca and Mg ions in water to form alum floc; in the dissolved air release area, a large amount of micro bubbles continuously released are combined with alum floc to form scum; in the flotation zone, scum with the specific gravity smaller than that of water is skimmed to a scum trough by a scum scraper, and clear water without suspended impurities, oils, Ca and Mg ions is collected by a perforated water collecting pipe at the bottom of the flotation zone and then is connected to a water outlet zone; in the water outlet area, discharging a part of effluent to an aerobic biochemical sedimentation tank, pumping a part of effluent by a high-pressure pump, injecting the part of effluent into a dissolved air tank, combining the effluent with compressed air introduced into the dissolved air tank to form a water-gas two-phase flow, refluxing the water-gas two-phase flow to a dissolved air release area of an air floatation tank, releasing a large amount of micro bubbles by a dissolved air releaser, and automatically discharging scum in the air floatation tank into a mud collecting well by gravity flow;
4) the effluent of the air floatation tank automatically flows into an aerobic biochemical sedimentation tank by gravity, and 2 biochemical areas and sedimentation areas are sequentially arranged in the aerobic biochemical sedimentation tank along the water flow in the horizontal direction; supplying compressed air to the biochemical region, keeping the concentration of dissolved oxygen in the pool between 6.0-8.0 mg/L, adding a composite carbon source, and oxidizing and decomposing biodegradable micromolecular organic matters in the wastewater into CO by aerobic bacteria2、H2O, effectively removing COD; the effluent of the biochemical area enters a subsequent sedimentation area to complete the separation of mud and water, and the mud discharging gravity of the sedimentation area automatically discharges into a mud collecting well;
5) the effluent of the aerobic biochemical sedimentation tank automatically flows into a Fenton oxidation sedimentation tank by gravity, and an oxidation zone and 2 sedimentation zones are sequentially arranged in the tank along the water flow in the horizontal direction; adding a Fenton reagent into the oxidation zone, and correspondingly reducing the pH value of the wastewater to 5.0-5.5 to be acidic; under acidic conditions, Fe2+And H2O2OH free radicals generated by chain reaction catalysis have strong oxidizing capability, and the organic matters which are difficult to degrade in the wastewater are oxidized and decomposed into inorganic matters, so that the wastewater has the effects of sterilization and disinfection;
adding a neutralizing agent into the settling zone, adjusting the pH value of the wastewater to 8.0-8.5, effectively removing suspended impurities, Ca and Mg ions in the wastewater while performing a neutralization reaction, and automatically discharging the sludge discharged from the settling zone into a sludge collecting well by gravity flow;
6) the effluent of the Fenton oxidation sedimentation tank is connected into a quartz sand filter tank, the influent of the filter tank passes through a quartz sand filter material layer from top to bottom after being uniformly distributed with water, suspended impurities, oils and other pollutants in the wastewater are intercepted and adhered to filter materials, the effluent at the bottom of the filter tank can be further purified, and the effluent quality meets the requirement of reclaimed water reuse water quality; when the filter tank normally operates, the quartz sand filter material needs to be periodically back-flushed, and back-flushed drainage water is drained into a mud collecting well by gravity flow;
7) the outlet water of the quartz sand filter tank is connected into a reuse water tank, and the outlet water is pumped to a water using workshop by a reclaimed water lift pump arranged outside the tank; the amount of reclaimed water is usually less than the water consumption of a water-using workshop, and tap water is timely supplemented into the reuse water pool to meet the water consumption of the water-using workshop;
8) scum in the air floatation tank, sludge discharged from the aerobic biochemical sedimentation tank and the Fenton oxidation sedimentation tank and backflush water discharged from the quartz sand filter tank are discharged into a sludge collecting well buried underground, and are pumped to a sludge concentration tank by a sludge lifting pump arranged at the bottom of the well, and the water content of the sludge is reduced to 97-98% from more than 99% through gravity concentration;
the sludge discharged from the sludge concentration tank flows into a sludge homogenizing tank by gravity, and a composite conditioner is added to improve the dehydration performance of the sludge; and pumping the sludge discharged from the sludge homogenizing pool to a sludge dewatering machine by a sludge feeding pump arranged outside the pool for further mechanical dewatering, wherein the water content of the separated sludge cake is below 60%.
Further, in the step 1), floating oil and floating slag with specific gravity smaller than that of water in the wastewater are scraped to a slag groove by a slag scraper in the oil separating tank, and special floating oil recovery is performed after collection; the hydraulic retention time of the oil separation tank is 1.0h, the horizontal advancing speed of the slag scraper is 2.0m/min, and the effluent of the oil separation tank is discharged from the bottom of the tank.
Further, in the step 2), the regulating tank has the functions of balancing water quality and regulating water quantity, and the hydraulic retention time is 4.0-6.0 h.
Further, in the step 3), the air floatation tank is arranged above the regulating tank in an overhead manner, the hydraulic retention time is 45min, and the water inlet is positioned at the upper part of the tank; the diameter of the micro-bubbles in the dissolved air release area is generally less than 0.1 mm;
the added compound coagulant comprises aluminum sulfate and lime with the weight ratio of 1:1, and the adding amount is as follows: per m30.25kg of composite coagulant is added into the treated water.
Further, in the step 4), the effluent of the air floatation tank flows into an aerobic biochemical sedimentation tank by gravity, a water inlet is positioned at the upper part of the tank, the aerobic biochemical sedimentation tank is arranged on the ground, and the hydraulic retention time is 15.0 h; semi-soft elastic filler is hung in the biochemical region and used as a carrier of aerobic bacteria;
the added composite carbon source comprises wheat bran and glucose with the weight ratio of 1.5:1, and the adding amount is as follows: per m30.90kg of composite carbon source is added into the treated water.
Further, in the step 5), the Fenton oxidation sedimentation tank is arranged on the ground, and the hydraulic retention time is 5.0 h;
the added Fenton reagent comprises the components of sulfuric acid, hydrogen peroxide and ferrous sulfate, and the adding amount is respectively as follows: per m3Adding 0.40L of industrial sulfuric acid, 0.12L of hydrogen peroxide and 0.13kg of ferrous sulfate into the treated water, wherein the volume concentration of the industrial sulfuric acid is 98 percent, and the volume concentration of the hydrogen peroxide is 30 percent;
the added neutralizing agent comprises caustic soda NaOH, and the adding amount is as follows: per m30.55L of caustic soda is added into the treated water, and the volume concentration of the caustic soda is 30 percent.
Further, in the step 6), the effluent of the Fenton oxidation sedimentation tank is connected into a water distribution tank at the upper part of a quartz sand filter tank, the quartz sand filter tank is arranged in a semi-underground manner, and the hydraulic retention time is 30 min; the filter tank is filled with 0.90m high quartz sand with the particle size: 0.8-1.2 mm.
Further, in the step 7), the effluent of the quartz sand filter tank is connected into a reuse water tank, the effluent is connected from the upper part of the water tank, the reuse water tank is arranged in a semi-underground mode, and the hydraulic retention time is 4.0-6.0 h.
Further, the components of the compound conditioner added in the step 8) are ferrous sulfate and lime,the weight ratio is 0.7:1, and the adding amount is as follows: per m3And adding 0.15-0.25 kg of composite conditioner into the treated sludge.
The invention provides a treatment technology taking aerobic biochemical treatment and Fenton oxidation as main processes, which can lead polyacrylate slurry in water-jet weaving wastewater to be inorganic, effectively remove organic and inorganic pollutants in the wastewater, lead the treated effluent to be used as reclaimed water and be reused for water-jet of a weaving machine, realize zero emission of water-jet weaving wastewater treatment and ensure that the reuse rate of the reclaimed water is 100 percent.
The invention has the following beneficial effects:
1. oil removal, namely removing floating oil and scum with the specific gravity smaller than that of water in the wastewater;
2. adding a composite coagulant to remove suspended impurities, oils and metal ions such as Ca, Mg and the like in the wastewater;
3. adding a composite carbon source, and oxidizing and decomposing organic matters in the wastewater into CO by aerobic microorganisms2、H2Inorganic substances such as O and the like effectively remove COD;
4. the Fenton reagent oxidizes and decomposes biologically refractory organic matters such as slurry, detergent and the like in the wastewater into inorganic matters, and has the effects of sterilization and disinfection; adding a neutralizing agent, adjusting the pH value of the wastewater to 8.0-8.5, effectively removing suspended impurities and metal ions such as Ca, Mg and the like in the wastewater while performing a neutralization reaction, wherein the water quality of the effluent basically meets the water quality requirement of reclaimed water reuse;
5. and (3) filtering the quartz sand to further remove suspended impurities and oils in the wastewater and ensure that the water quality of the effluent meets the requirement of reclaimed water reuse water quality.
Drawings
Fig. 1 is a schematic diagram of the operation of the present invention.
Detailed Description
As shown in figure 1, the invention treats and recycles the water-jet weaving wastewater containing polyacrylate slurry, and the main procedures are as follows:
1) and the wastewater discharged from the water jet loom workshop automatically flows into an oil separation tank buried underground by gravity. In the oil separation tank, floating oil and floating slag with specific gravity smaller than that of water in the wastewater are scraped to a slag groove by a slag scraper, and special floating oil recovery is performed after collection. The hydraulic retention time of the oil separation tank is 1.0h, the horizontal advancing speed of the slag scraper is 2.0m/min, and the effluent of the oil separation tank is discharged from the bottom of the tank.
2) And the water outlet of the oil separation tank automatically flows into an adjusting tank buried underground by gravity. The adjusting tank has the functions of equalizing water quality and adjusting water quantity, the hydraulic retention time is 4.0-6.0 h, and the effluent is pumped to the air floatation tank by a sewage lifting pump arranged at the bottom of the tank.
3) And the water outlet of the regulating tank enters the air floatation tank in a pressure flow state, the air floatation tank is arranged above the regulating tank in an overhead manner, the hydraulic retention time is 45min, and the water inlet is positioned at the upper part of the tank. In the horizontal direction, along the water flow, 4 zones of a mixed flocculation zone, a dissolved air release zone, a flotation zone and a water outlet zone are sequentially arranged in the tank.
Adding a composite coagulant into the mixed flocculation area, capturing suspended impurities, oils and metal ions such as Ca, Mg and the like in water to form alum floc, and effectively removing the alum floc in an air floatation tank; the added compound coagulant comprises aluminum sulfate and lime with the weight ratio of 1:1, and the adding amount is as follows: per m30.25kg of composite coagulant is added into the treated water;
in the dissolved air release area, a large number of micro bubbles (the diameter is generally less than 0.1 mm) which are continuously released are combined with alum floc to form scum; in the flotation zone, scum with the specific gravity smaller than that of water is skimmed to a scum trough by a scum scraper, and clear water without suspended impurities, oils, metal ions such as Ca, Mg and the like is collected by a perforated water collecting pipe at the bottom of the flotation zone and then is connected to a water outlet zone;
in the water outlet area, part of the outlet water is discharged to an aerobic biochemical sedimentation tank, and part of the outlet water is pumped up by a high-pressure pump and injected into a dissolved air tank, and is combined with compressed air introduced into the dissolved air tank to form a water-gas two-phase flow, the water-gas two-phase flow flows back to a dissolved air release area of the air floatation tank, and a large amount of micro bubbles are released by a dissolved air release device. And the scum of the air floatation tank is automatically discharged into a mud collecting well by gravity.
4) The effluent of the air floatation tank flows into an aerobic biochemical sedimentation tank by gravity, a water inlet is positioned at the upper part of the tank, the aerobic biochemical sedimentation tank is arranged on the ground, and the hydraulic retention time is 15.0 h. Along the horizontal direction, along rivers, there are 2 districts in biochemical district, settling zone in proper order in the pond.
Supplying compressed air to the biochemical region, keeping the concentration of Dissolved Oxygen (DO) in the pool between 6.0-8.0 mg/L, adding a composite carbon source, and oxidizing and decomposing the easily-degradable micromolecular organic matters in the wastewater into CO by aerobic bacteria2、H2Inorganic substances such as O and the like effectively remove COD; the added composite carbon source comprises wheat bran and glucose with the weight ratio of 1.5:1, and the adding amount is as follows: per m30.90kg of composite carbon source is added into the treated water;
semi-soft elastic filler is hung in the biochemical region and used as a carrier of aerobic bacteria. The effluent of the biochemical area enters a subsequent sedimentation area to complete the separation of mud and water; and the sludge in the settling zone is discharged into a sludge collecting well by gravity flow.
5) And the effluent of the aerobic biochemical sedimentation tank automatically flows into a Fenton oxidation sedimentation tank, the Fenton oxidation sedimentation tank is arranged on the ground, and the hydraulic retention time is 5.0 h. In the horizontal direction, along the water flow, 2 areas of an oxidation area and a sedimentation area are sequentially arranged in the pool. Adding fenton reagents such as sulfuric acid, hydrogen peroxide and ferrous sulfate into the oxidation zone, wherein the pH value of the wastewater is correspondingly reduced to 5.0-5.5, the wastewater is acidic, and the adding amount is respectively as follows: per m3Adding 0.40L of industrial sulfuric acid (with the concentration of 98%), 0.12L of hydrogen peroxide (with the concentration of 30%) and 0.13kg of ferrous sulfate into the treated water; when the industrial sulfuric acid with the volume concentration of 98% is put in, the industrial sulfuric acid needs to be diluted to the volume concentration of 10%, and similarly, when the hydrogen peroxide with the volume concentration of 30% is put in, the industrial sulfuric acid needs to be diluted to the volume concentration of 10%.
Under acidic conditions, Fe2+And H2O2The OH free radical generated by the chain reaction has strong oxidizing ability, and can oxidize and decompose the difficultly biodegradable organic matters such as slurry, detergent and the like in the wastewater into inorganic matters, thereby having the effects of sterilization and disinfection.
Adding a neutralizing agent (NaOH) into the settling zone, adjusting the pH value of the wastewater to 8.0-8.5, effectively removing suspended impurities and metal ions such as Ca and Mg in the wastewater while performing a neutralization reaction, and enabling the water quality of the effluent to basically meet the water quality requirement of reclaimed water reuse; the adding amount is as follows: per m30.55L of caustic soda (30 percent concentration) is added into the treated water, and the volume concentration of the caustic soda is 30 percentWhen the alkali is added, the alkali is required to be diluted to a volume concentration of 10%; and the sludge in the settling zone is discharged into a sludge collecting well by gravity flow.
6) And the effluent of the Fenton oxidation sedimentation tank is connected into a water distribution tank at the upper part of a quartz sand filter tank, the quartz sand filter tank is arranged in a semi-underground mode, and the hydraulic retention time is 30 min. The filter tank is filled with 0.90m high quartz sand (the grain diameter is 0.8-1.2 mm);
after water is uniformly distributed, the inlet water of the filter tank passes through the quartz sand filter material layer from top to bottom, suspended impurities, oils and other pollutants in the wastewater are intercepted and adhered to the filter material, the outlet water at the bottom of the filter tank can be further purified, and the quality of the outlet water meets the requirement of reclaimed water reuse quality.
When the filter tank normally operates, the quartz sand filter material needs to be periodically back-flushed, and back-flushed drainage water is drained into the mud collecting well by gravity flow.
7) And the outlet water of the quartz sand filter tank is connected into a reuse water tank, the quartz sand filter tank is connected into the upper part of the water tank, the reuse water tank is arranged in a semi-underground mode, the hydraulic retention time is 4.0-6.0 h, and the outlet water is pumped to a water using workshop by a reclaimed water lifting pump arranged outside the tank. The amount of the reclaimed water is usually less than that of the water consumption of a water consumption workshop, and tap water is timely supplemented into the reuse water pool to meet the water consumption of the water consumption workshop.
8) After scum in the floatation tank, sludge discharged from the aerobic biochemical sedimentation tank and the Fenton oxidation sedimentation tank and backflush drainage of the quartz sand filter tank are discharged into a sludge collecting well buried underground, the sludge is pumped into a sludge concentration tank by a sludge lifting pump arranged at the bottom of the well, and the water content of the sludge is reduced to 97-98 percent from more than 99 percent through the gravity concentration effect;
the sludge discharged from the sludge concentration tank flows into a sludge homogenizing tank by gravity, and a composite conditioner is added to improve the dehydration performance of the sludge; the added composite conditioner comprises ferrous sulfate and lime in a weight ratio of 0.7:1, and the added amount is as follows: per m3And adding 0.15-0.25 kg of composite conditioner into the treated sludge. And pumping the sludge discharged from the sludge homogenizing pool to a sludge dewatering machine by a sludge feeding pump arranged outside the pool for further mechanical dewatering, wherein the water content of the separated sludge cake is below 60%.
The process technology of the invention can effectively treat and recycle the water-spraying weaving wastewater containing polyacrylate slurry, has the advantages of little engineering investment, obvious treatment effect, stable quality of recycled water, 100 percent of reclaimed water reuse rate and reasonable operation cost, and thoroughly eliminates the problem of water environment pollution in the filament weaving industry.

Claims (9)

1. A treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry is characterized by comprising the following steps:
1) the wastewater discharged from a water jet loom workshop automatically flows into an oil separation tank buried underground by gravity, and floating oil and floating slag with specific gravity smaller than that of water contained in the wastewater are removed;
2) the effluent of the oil separation tank flows into an adjusting tank buried underground by gravity; the effluent of the regulating tank is pumped to the air floatation tank by a sewage lifting pump arranged at the bottom of the tank;
3) the horizontal direction is along the water flow, and 4 areas of a mixed flocculation area, a dissolved air release area, a flotation area and a water outlet area are sequentially arranged in the air flotation tank; adding a composite coagulant into the mixed flocculation area, and capturing suspended impurities, oils, Ca and Mg ions in water to form alum floc; in the dissolved air release area, a large amount of micro bubbles continuously released are combined with alum floc to form scum; in the flotation zone, scum with the specific gravity smaller than that of water is skimmed to a scum trough by a scum scraper, and clear water without suspended impurities, oils, Ca and Mg ions is collected by a perforated water collecting pipe at the bottom of the flotation zone and then is connected to a water outlet zone; in the water outlet area, discharging a part of effluent to an aerobic biochemical sedimentation tank, pumping a part of effluent by a high-pressure pump, injecting the part of effluent into a dissolved air tank, combining the effluent with compressed air introduced into the dissolved air tank to form a water-gas two-phase flow, refluxing the water-gas two-phase flow to a dissolved air release area of an air floatation tank, releasing a large amount of micro bubbles by a dissolved air releaser, and automatically discharging scum in the air floatation tank into a mud collecting well by gravity flow;
4) the effluent of the air floatation tank automatically flows into an aerobic biochemical sedimentation tank by gravity, and 2 biochemical areas and sedimentation areas are sequentially arranged in the aerobic biochemical sedimentation tank along the water flow in the horizontal direction; supplying compressed air to the biochemical region, keeping the concentration of dissolved oxygen in the pool between 6.0 and 8.0mg/L, adding a composite carbon source, and leading aerobic bacteria to easily reduce organisms in the wastewaterDecomposing micromolecular organic matter into CO by oxidation2、H2O, effectively removing COD; the effluent of the biochemical area enters a subsequent sedimentation area to complete the separation of mud and water, and the mud discharging gravity of the sedimentation area automatically discharges into a mud collecting well;
5) the effluent of the aerobic biochemical sedimentation tank automatically flows into a Fenton oxidation sedimentation tank by gravity, and an oxidation zone and 2 sedimentation zones are sequentially arranged in the tank along the water flow in the horizontal direction; adding a Fenton reagent into the oxidation zone, and correspondingly reducing the pH value of the wastewater to 5.0-5.5 to be acidic; under acidic conditions, Fe2+And H2O2OH free radicals generated by chain reaction catalysis have strong oxidizing capability, and the organic matters which are difficult to degrade in the wastewater are oxidized and decomposed into inorganic matters, so that the wastewater has the effects of sterilization and disinfection;
adding a neutralizing agent into the settling zone, adjusting the pH value of the wastewater to 8.0-8.5, effectively removing suspended impurities, Ca and Mg ions in the wastewater while performing a neutralization reaction, and automatically discharging the sludge discharged from the settling zone into a sludge collecting well by gravity flow;
6) the effluent of the Fenton oxidation sedimentation tank is connected into a quartz sand filter tank, the influent of the filter tank passes through a quartz sand filter material layer from top to bottom after being uniformly distributed with water, suspended impurities, oils and other pollutants in the wastewater are intercepted and adhered to filter materials, the effluent at the bottom of the filter tank can be further purified, and the effluent quality meets the requirement of reclaimed water reuse water quality; when the filter tank normally operates, the quartz sand filter material needs to be periodically back-flushed, and back-flushed drainage water is drained into a mud collecting well by gravity flow;
7) the outlet water of the quartz sand filter tank is connected into a reuse water tank, and the outlet water is pumped to a water using workshop by a reclaimed water lift pump arranged outside the tank; the amount of reclaimed water is usually less than the water consumption of a water-using workshop, and tap water is timely supplemented into the reuse water pool to meet the water consumption of the water-using workshop;
8) scum in the air floatation tank, sludge discharged from the aerobic biochemical sedimentation tank and the Fenton oxidation sedimentation tank and backflush water discharged from the quartz sand filter tank are discharged into a sludge collecting well buried underground, and are pumped to a sludge concentration tank by a sludge lifting pump arranged at the bottom of the well, and the water content of the sludge is reduced to 97-98% from more than 99% through gravity concentration;
the sludge discharged from the sludge concentration tank flows into a sludge homogenizing tank by gravity, and a composite conditioner is added to improve the dehydration performance of the sludge; and pumping the sludge discharged from the sludge homogenizing pool to a sludge dewatering machine by a sludge feeding pump arranged outside the pool for further mechanical dewatering, wherein the water content of the separated sludge cake is below 60%.
2. The process according to claim 1, wherein in step 1), floating oil and floating slag with specific gravity smaller than that of water in the wastewater are scraped to a slag groove by a slag scraper in an oil separation tank, and collected for special floating oil recovery; the hydraulic retention time of the oil separation tank is 1.0h, the horizontal advancing speed of the slag scraper is 2.0m/min, and the effluent of the oil separation tank is discharged from the bottom of the tank.
3. The process for treating and recycling the water-jet weaving wastewater containing the polyacrylate type slurry as claimed in claim 1, wherein in the step 2), the regulating tank has the functions of water quality equalization and water quantity regulation, and the hydraulic retention time is 4.0-6.0 h.
4. The process for treating and recycling the water-jet weaving wastewater containing the polyacrylate type slurry as claimed in claim 1, wherein in the step 3), the air flotation tank is arranged overhead above the regulating tank, the hydraulic retention time is 45min, and the water inlet is positioned at the upper part of the tank; the diameter of the micro-bubbles in the dissolved air release area is generally less than 0.1 mm;
the added compound coagulant comprises aluminum sulfate and lime with the weight ratio of 1:1, and the adding amount is as follows: per m30.25kg of composite coagulant is added into the treated water.
5. The process of claim 1, wherein in step 4), the effluent from the flotation tank flows into an aerobic biochemical sedimentation tank by gravity, the water inlet is positioned at the upper part of the tank, the aerobic biochemical sedimentation tank is arranged on the ground, and the hydraulic retention time is 15.0 h; semi-soft elastic filler is hung in the biochemical region and used as a carrier of aerobic bacteria;
the added composite carbon source comprises wheat bran and glucose with the weight ratio of 1.5:1, and the adding amount is as follows: per m30.90kg of composite carbon source is added into the treated water.
6. The process of claim 1, wherein in step 5), the Fenton oxidation sedimentation tank is arranged on the ground, and the hydraulic retention time is 5.0 h;
the added Fenton reagent comprises the components of sulfuric acid, hydrogen peroxide and ferrous sulfate, and the adding amount is respectively as follows: per m3Adding 0.40L of industrial sulfuric acid, 0.12L of hydrogen peroxide and 0.13kg of ferrous sulfate into the treated water, wherein the volume concentration of the industrial sulfuric acid is 98 percent, and the volume concentration of the hydrogen peroxide is 30 percent;
the added neutralizing agent comprises caustic soda NaOH, and the adding amount is as follows: per m30.55L of caustic soda is added into the treated water, and the volume concentration of the caustic soda is 30 percent.
7. The process of claim 1, wherein in step 6), the effluent of the Fenton oxidation sedimentation tank is connected to a water distribution tank at the upper part of a quartz sand filter tank, the quartz sand filter tank is arranged in a semi-underground manner, and the hydraulic retention time is 30 min; the filter tank is filled with 0.90m high quartz sand with the particle size: 0.8-1.2 mm.
8. The process for treating and recycling water-jet weaving wastewater containing polyacrylate type slurry according to claim 1, wherein in the step 7), the effluent of the quartz sand filter tank is connected into a recycling water tank, the effluent is connected from the upper part of the water tank, the recycling water tank is arranged in a semi-underground manner, and the hydraulic retention time is 4.0-6.0 h.
9. The process for treating and recycling water-jet weaving wastewater containing polyacrylate type slurry as claimed in claim 1, whereinCharacterized in that the components of the compound conditioner added in the step 8) are ferrous sulfate and lime, the weight ratio of the ferrous sulfate to the lime is 0.7:1, and the adding amount is as follows: per m3And adding 0.15-0.25 kg of composite conditioner into the treated sludge.
CN201911373487.7A 2019-12-27 2019-12-27 Treatment and recycling process of water-jet weaving wastewater containing polyacrylate slurry Pending CN111003899A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104045178A (en) * 2013-03-12 2014-09-17 绍兴深水环保设备有限公司 Hydraulic-loom wastewater treatment recycling method
US20180339925A1 (en) * 2015-03-31 2018-11-29 Organo Corporation Method for forming aerobic granules, device for forming aerobic granules, method for treating wastewater, and device for treating wastewater
CN109095704A (en) * 2018-07-12 2018-12-28 福建省晋江优兰发纸业有限公司 A kind of processing method of colored translucent paper waste water
CN209143980U (en) * 2018-11-28 2019-07-23 桐乡市景丰纺织有限公司 A kind of water-jet loom waste water treatment system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104045178A (en) * 2013-03-12 2014-09-17 绍兴深水环保设备有限公司 Hydraulic-loom wastewater treatment recycling method
US20180339925A1 (en) * 2015-03-31 2018-11-29 Organo Corporation Method for forming aerobic granules, device for forming aerobic granules, method for treating wastewater, and device for treating wastewater
CN109095704A (en) * 2018-07-12 2018-12-28 福建省晋江优兰发纸业有限公司 A kind of processing method of colored translucent paper waste water
CN209143980U (en) * 2018-11-28 2019-07-23 桐乡市景丰纺织有限公司 A kind of water-jet loom waste water treatment system

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