CN106746310A - The processing method of dyeing waste water - Google Patents

Abstract

The processing method of the dyeing waste water that the present invention is introduced includes CO₂Neutralization, the treatment process such as zinc powder reduction, hydrolysis acidification, aerobic, biological filtering tower combined working of being pressurizeed under ul-trasonic irradiation, the waste water energy stably reaching standard discharge after treatment.

Description

The processing method of dyeing waste water

Technical field

The present invention relates to a kind of processing method of dyeing waste water.

Background technology

Printing and dyeing are the significant process of textile industry.By printing and dyeing, the pattern of textile can be increased, improve the life of the mankind Quality.In dyeing process, dyeing waste water is inevitably resulted from, the COD of the waste water_CrConcentration is high, and colourity is big, and basicity is high, If being directly discharged into environment will cause severe contamination to environment.The processing method of current dyeing waste water mainly has biochemistry treatment side Method, physical-chemical process and method of chemical treatment.These disposal methods are relatively costly, and effect is unstable, it is difficult to which stably reaching standard is arranged Put.Biochemical process produces a large amount of H due to sulfuric acid to be added in anaerobism or Hydrolysis Acidification₂S, causes more serious two Secondary pollution, further, since a large amount of SO₄ ^2-Presence, suppress microorganism growth, have a strong impact on the chemically treated effect of wastewater biological Really.The treatment method of printing and dying wastewater that development cost is low, high treating effect, secondary pollution are small has larger practical value.

The content of the invention

For the problem of current treatment method of printing and dying wastewater, the purpose of the present invention is to find high treating effect, processing cost The small treatment method of printing and dying wastewater of low, secondary pollution, it is characterised in that the dyeing waste water CO after adjusted pond is adjusted₂（CO₂ Can be industrial CO₂, or mineral decompose the CO for producing₂, fuel combustion produce CO₂）Its pH value is adjusted to less than after 7 1h~3h is precipitated into sedimentation basin, irregularly sludge is extracted out from sedimentation basin and is filtered, filter cake is made at dangerous solid waste Put, filtrate returns to sedimentation basin.The supernatant feeding voltage-resistant reactor of sedimentation basin, adds reactor, and be passed through work by cleaning zinc powder Industry CO₂Reacted, the granularity of zinc powder is less than 180 mesh, and every liter of waste water adds zinc powder 5g~10g, stirred under ul-trasonic irradiation Reaction time be 8min~20min, reaction temperature be 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~0.5MPa.Every cubic metre The power of waste water input ultrasonic wave is 2kW~8kW.Reacted waste water carries out solid-liquor separation, and the zinc powder isolated returns to reaction Device.Waste water milk of lime or other alkaline matters after solid-liquor separation adjust its pH value to 6~8, subsequently into sedimentation basin precipitation 1h~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns to precipitation Pond.The supernatant of sedimentation basin send hydrolysis acidification pool.Waste water normal temperature in hydrolysis acidification pool stops 4h~8h.It is useless after hydrolysis acidification Into the treatment of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 4h~10h to water.Waste water after Aerobic Process for Treatment is precipitated into sedimentation basin 1h~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns aerobic Pond.The supernatant waste water of sedimentation basin send multi-layer biological filter tower to process.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, per thickness It is 0.5m~1.2m to spend, and gross thickness is 1m~3m.The dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria （Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 50 m³/m².d~150m³/m².d.The water outlet of biological filtering tower combined working reaches Mark discharge or reuse.

The object of the present invention is achieved like this, and dyeing waste water is passed through CO₂Afterwards, some dyes and textile dissolved matter pass through Acid precipitation reaction produces sediment, and then is removed it by precipitation process, reduces the load of subsequent processes.It is useless after acid out Water enters voltage-resistant reactor, the larger molecular organicses in waste water, particularly persistence organic pollutant（Have containing phenyl ring, heterocycle Machine thing）The effect of the strong reduction free radical for producing is reduced by iron and is destroyed, be that subsequent biochemical treatment creates favorable conditions.It is passed through Pressure CO₂Purpose be to maintain iron to reduce suitable pH value（2.0~5.0）；The purpose for being input into ultrasonic wave is the biography for accelerating reaction Matter process.Waste water milk of lime or other alkaline matters after reduction adjust its pH, to meet sequential hydrolysis acidifying and aerobic mistake The requirement of journey.Through the waste water of aforementioned processing in Hydrolysis Acidification, by the effect of microorganism, larger molecular organicses are further Become small organic molecule, be that more favorable condition is created in subsequent bio oxidation.Processed by biological oxidation, it is most of remaining to have Machine thing is removed.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in the work of microorganism, particularly red pseudomonas Under, further organics removal, it is ensured that the waste water stably reaching standard discharge after treatment.

Relative to existing method, outstanding advantages of the invention are to use CO₂It is acidified instead of now widely used sulfuric acid Agent, does not introduce SO₄ ^2-Ion, essentially eliminates generation H₂The material base of S（Some dyes contain S）, so as to significantly reduce H₂S's Pollution, while it also avoid SO₄ ^2-To hydrolysis acidification and it is aerobic during microorganism inhibitory action, greatly improve biological treatment Efficiency；Boiler, the CO that fuel combustion is produced all are had in printing and dyeing mill₂Waste gas can make full use of, and can not only reduce processing cost, and And carbon emission can be reduced；Waste water energy stably reaching standard discharge after treatment, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：Daily treatment 1m³Dyeing waste water（pH10.7、COD_Cr5600mg/L、BOD₅1100mg/L, colourity 320, benzene Amine 24mg/L, T-N98mg/L）, by CO₂Regulation pH（6.5）, zinc powder reduction（Every liter of waste water add zinc powder 5g, 8min, 40 DEG C, CO₂The power of every cubic metre of waste water input ultrasonic wave of pressure 0.1MPa is 4kW）, hydrolysis acidification（4h）, aerobic biochemical（4h）And work Property charcoal biological filtering tower combined working（Hydraulic load is 100m³/m².d, activated carbon gross thickness 1m）Treatment, effluent quality is COD_Cr32mg/L、 BOD₅4mg/L, colourity 6, T-N9mg/L, aniline is not detected.

Embodiment 2：60m is processed when daily³Dyeing waste water（pH10.5、COD_Cr6300mg/L、BOD₅1250mg/L, colourity 330, aniline 28mg/L, T-N102mg/L）, CO₂Regulation pH（6.8）, zinc powder reduction（Every liter of waste water add zinc powder 10g, 15min、25℃、CO₂Pressure 0.3MPa, the power of every cubic metre of waste water input ultrasonic wave are 2kW）, hydrolysis acidification（6h）, it is aerobic It is biochemical（6h）With porous ceramic grain biological filtering tower combined working（Hydraulic load is 150m³/m².d, porous ceramic grain gross thickness 2m）Treatment, effluent quality It is COD_Cr39mg/L、BOD₅6mg/L, colourity 8, T-N10mg/L, aniline is not detected.

Claims (1)

1. a kind of processing method of dyeing waste water, it is characterised in that the dyeing waste water CO after adjusted pond is adjusted₂（CO₂Can Being industrial CO₂, or mineral decompose the CO for producing₂, fuel combustion produce CO₂）Adjust its pH value laggard to being less than 7 Enter sedimentation basin precipitation 1h~3h, irregularly extract sludge out from sedimentation basin and filtered, filter cake makees dangerous disposition of solid waste, Filtrate returns to sedimentation basin, and cleaning zinc powder is added reactor, and be passed through industry by the supernatant feeding voltage-resistant reactor of sedimentation basin CO₂Reacted, the granularity of zinc powder is less than 180 mesh, and every liter of waste water adds zinc powder 5g~10g, stirs anti-under ul-trasonic irradiation It is 8min~20min between seasonable, reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~0.5MPa, every cubic metre give up The power of water input ultrasonic wave is 2kW~8kW, and reacted waste water carries out solid-liquor separation, the zinc powder Returning reactor isolated, Waste water milk of lime or other alkaline matters after solid-liquor separation adjust its pH value to 6~8, subsequently into sedimentation basin precipitation 1h~ 3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns to sedimentation basin, The supernatant of sedimentation basin send hydrolysis acidification pool, waste water normal temperature in hydrolysis acidification pool to stop 4h~8h, the waste water after hydrolysis acidification Into the treatment of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 4h~10h, and the waste water after Aerobic Process for Treatment enters sedimentation basin and precipitates 1h ~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns aerobic Pond, the supernatant waste water of sedimentation basin send multi-layer biological filter tower to process, and the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, and filler is total Thickness is 1m~3m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, and the hydraulic load of biological filtering tower combined working is 50 m³/m².d~150m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.