CN106587520A - Treatment method for printing and dyeing wastewater - Google Patents

Abstract

The invention provides a treatment method for printing and dyeing wastewater. The treatment method comprises treatment procedures of neutralizing by CO2, pressurizing manganese powder under the action of ultrasonic wave and reducing, carrying out hydrolytic acidification, carrying out aerobic treatment, treating by a biological filtration tower and the like. The treated wastewater can be discharged after stably reaching standards.

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.At present the processing method of 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 add sulphuric acid 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.Development cost is low, the treatment method of printing and dying wastewater that high treating effect, secondary pollution are little 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 little 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 tank, irregularly sludge is extracted out from sedimentation tank and is filtered, filter cake is made at dangerous solid waste Put, filtrate returns sedimentation tank.The supernatant of sedimentation tank sends into voltage-resistant reactor, and cleaning manganese powder is added into reactor, and is passed through work Industry CO₂Reacted, the granularity of manganese powder is less than 180 mesh, and every liter of waste water adds manganese powder 5g～10g, stirs under ul-trasonic irradiation Response time is 8min～20min, and reaction temperature is 25 DEG C～60 DEG C, CO₂Pressure be 0.1MPa～0.5MPa.Per cubic metre The power of waste water input ultrasound wave is 2kW～8kW.Reacted waste water carries out solid-liquor separation, and the manganese powder isolated returns reaction Device.Waste water lime cream or other alkaline matters after solid-liquor separation adjusts its pH value to 6～8, subsequently into sedimentation tank precipitation 1h～3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns precipitation Pond.The supernatant of sedimentation tank send hydrolysis acidification pool.Waste water room temperature in hydrolysis acidification pool stops 4h～8h.It is useless after hydrolysis acidification Into the process of biology aerobic pond room temperature, the Aerobic Process for Treatment time is 4h～10h to water.Waste water after Aerobic Process for Treatment is precipitated into sedimentation tank 1h～3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns aerobic Pond.The supernatant waste water of sedimentation tank 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 Spend for 0.5m～1.2m, gross thickness is 1m～3m.The dominant bacteria of biological filtering tower combined working is the rhodopseudomonas 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 solute pass through Acid precipitation reaction produces precipitate, 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 ferrum and is destroyed, be that subsequent biochemical process creates favorable conditions.It is passed through Pressure CO₂Purpose be to maintain ferrum to reduce suitable pH value（2.0～5.0）；The purpose of input ultrasound wave is the biography for accelerating reaction Matter process.Waste water lime cream or other alkaline matters after reduction adjusts its pH, to meet sequential hydrolysis acidifying and aerobic mistake The requirement of journey.In Hydrolysis Acidification, by the effect of microorganism, larger molecular organicses are further for the premenstrual waste water for stating process Become small organic molecule, be that more favorable condition is created in subsequent bio oxidation.By biological oxidation process, remaining great majority 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 rhodopseudomonas With under, further organics removal, it is ensured that the waste water stably reaching standard discharge after process.

Relative to existing method, the outstanding advantages of the present invention are to adopt CO₂Now widely used sulphuric acid is replaced to neutralize 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 can reduce carbon emission；Waste water energy stably reaching standard discharge after process, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：It is daily to process 1m³Dyeing waste water（pH10.7、COD_Cr5600mg/L、BOD₅1100mg/L, colourity 320, aniline 24mg/L, T-N98mg/L）, through CO₂Adjust pH（6.5）, manganese powder reduction（Every liter of waste water adds manganese powder 5g, 8min, 40 DEG C, CO₂ The power of every cubic metre of waste water input ultrasound wave of pressure 0.1MPa is 4kW）, hydrolysis acidification（4h）, aerobic biochemical（4h）And activity Charcoal biological filtering tower combined working（Hydraulic load is 100m³/m².d, activated carbon gross thickness 1m）Process, effluent quality is COD_Cr72mg/L、 BOD₅10mg/L, colourity 13, T-N14mg/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）, CO₂Adjust pH（6.8）, manganese powder reduction（Every liter of waste water add manganese powder 10g, 15min、25℃、CO₂Pressure 0.3MPa, the power of every cubic metre of waste water input ultrasound 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）Process, effluent quality For COD_Cr80mg/L、BOD₅11mg/L, colourity 17, T-N18mg/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 tank precipitation 1h～3h, irregularly extract sludge out from sedimentation tank and filtered, filter cake makees dangerous disposition of solid waste, Filtrate returns sedimentation tank, and the supernatant of sedimentation tank sends into voltage-resistant reactor, and cleaning manganese powder is added into reactor, and is passed through industry CO₂Reacted, the granularity of manganese powder is less than 180 mesh, and every liter of waste water adds manganese 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, per cubic metre give up The power of water input ultrasound wave is 2kW～8kW, and reacted waste water carries out solid-liquor separation, the manganese powder Returning reactor isolated, Waste water lime cream or other alkaline matters after solid-liquor separation adjusts its pH value to 6～8, subsequently into sedimentation tank precipitation 1h～ 3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation tank, The supernatant of sedimentation tank send hydrolysis acidification pool, waste water room temperature in hydrolysis acidification pool to stop 4h～8h, the waste water after hydrolysis acidification Into the process of biology aerobic pond room temperature, the Aerobic Process for Treatment time is 4h～10h, and the waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h ～3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns aerobic Pond, the supernatant waste water of sedimentation tank 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 rhodopseudomonas 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.