CN106746328A - 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 CO₂The treatment process such as neutralization, the reduction of pressurization iron aluminium zinc composite powder, hydrolysis acidification, aerobic, biological filtering tower combined working, 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, reactor is added by cleaning iron aluminium zinc composite powder, And it is passed through industrial CO₂Reacted, the granularity of iron aluminium zinc composite powder is less than 180 mesh, and every liter of waste water adds iron aluminium zinc composite powder 5g ~10g, the content of every kind of metal is not less than 5% in iron aluminium zinc composite powder（The iron aluminium zinc composite powder that return is used is not limited）, The stirring reaction time be 1h~3h, reaction temperature be 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~0.5MPa.It is reacted Waste water carries out solid-liquor separation, the iron aluminium zinc composite powder Returning reactor isolated.Waste water milk of lime after solid-liquor separation or its His alkaline matter adjusts its pH value to 6~8, and 1h~3h is precipitated subsequently into sedimentation basin, irregularly extracts sludge out from sedimentation basin Filtered, filter cake makees dangerous disposition of solid waste, filtrate returns to sedimentation basin.The supernatant of sedimentation basin send hydrolysis acidification pool. Waste water normal temperature in hydrolysis acidification pool stops 4h~8h.Waste water after hydrolysis acidification is aerobic into the treatment of biology aerobic pond normal temperature Process time is 4h~10h.Waste water after Aerobic Process for Treatment enters sedimentation basin and precipitates 1h~3h, irregularly extracts dirty out from sedimentation basin Mud is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns to Aerobic Pond.The supernatant waste water of sedimentation basin send multi-layer biological Filter tower treatment.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, is 0.5m~1.2m per thickness degree, gross thickness be 1m~ 3m.The dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria（Rhodopseudomonas）.The water of biological filtering tower combined working Power load is 50 m³/m².d~150m³/m².d.The standard water discharge discharge or reuse of biological filtering tower combined working.

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 aluminium zinc composite powder and is destroyed, be that subsequent biochemical treatment creation has Sharp condition.It is passed through pressure CO₂Purpose be to maintain iron aluminium zinc composite powder to reduce suitable pH value（2.0~5.0）, it is useless after reduction Water milk of lime or other alkaline matters adjust its pH, to meet sequential hydrolysis acidifying and the requirement of aerobic process.Through foregoing place In Hydrolysis Acidification, by the effect of microorganism, larger molecular organicses further become small organic molecule to the waste water of reason, For more favorable condition is created in subsequent bio oxidation.Processed by biological oxidation, remaining most of organic matters are removed.Waste water is most Enter activated carbon or porous ceramic grain biological filtering tower combined working afterwards, in the presence of microorganism, particularly red pseudomonas, further removal has Machine thing, 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_Cr5700mg/L、BOD₅1150mg/L, colourity 330, benzene Amine 24mg/L, T-N108mg/L）, by CO₂Regulation pH（6.5）, iron aluminium zinc composite powder reduction（Every liter of waste water adds iron aluminium zinc to answer Close powder 5g, 3h, 25 DEG C, CO₂Pressure 0.1MPa）, hydrolysis acidification（4h）, aerobic biochemical（4h）With activated carbon biological filtering tower combined working（Waterpower Load is 100m³/m².d, activated carbon gross thickness 1m）Treatment, effluent quality is COD_Cr42mg/L、BOD₅5mg/L, colourity 8, T- N15mg/L, aniline is not detected.

Embodiment 2：60m is processed when daily³Dyeing waste water（pH11、COD_Cr7000mg/L、BOD₅1450mg/L, colourity 410, aniline 30mg/L, T-N96mg/L）, CO₂Regulation pH（6.8）, iron aluminium zinc composite powder reduction（Every liter of waste water adds iron aluminium Zinc composite powder 10g, 1h, 40 DEG C, CO₂Pressure 0.3MPa）, hydrolysis acidification（6h）, aerobic biochemical（6h）With porous ceramic grain biological filter Tower（Hydraulic load is 150m³/m².d, porous ceramic grain gross thickness 2m）Treatment, effluent quality is COD_Cr45mg/L、BOD₅8mg/L、 Colourity 10, T-N12mg/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 adjusted₂Adjust it PH value enters sedimentation basin and precipitates 1h~3h to after less than 7, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake is made dangerous Disposition of solid waste, filtrate returns to sedimentation basin, and the supernatant feeding voltage-resistant reactor of sedimentation basin will clean iron aluminium zinc composite powder Reactor is added, and is passed through industrial CO₂Reacted, the granularity of iron aluminium zinc composite powder is less than 180 mesh, and every liter of waste water adds iron aluminium Zinc composite powder 5g~10g, the content of every kind of metal is not less than 5% in iron aluminium zinc composite powder, and the stirring reaction time is 1h~3h, instead Answer temperature for 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~0.5MPa, reacted waste water carries out solid-liquor separation, isolates Iron aluminium zinc composite powder Returning reactor, waste water milk of lime or other alkaline matters after solid-liquor separation adjust its pH value to 6 ~8,1h~3h is precipitated subsequently into sedimentation basin, irregularly to extract sludge out from sedimentation basin and filtered, filter cake makees dangerous solid Waste treatment, filtrate returns to sedimentation basin, and the supernatant of sedimentation basin send hydrolysis acidification pool, waste water normal temperature in hydrolysis acidification pool to stop 4h~8h is stayed, into the treatment of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 4h~10h, aerobic place to the waste water after hydrolysis acidification Waste water after reason enters sedimentation basin and precipitates 1h~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake is made dangerous solid Body waste treatment, filtrate returns to Aerobic Pond, and the supernatant waste water of sedimentation basin send multi-layer biological filter tower to process, the filler of biological filtering tower combined working It is activated carbon or porous ceramic grain, filler gross thickness is 1m~3m, and the dominant bacteria of biological filtering tower combined working is red false single in photosynthetic bacteria Born of the same parents bacterium, 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.