CN106587521A - Processing method for printing and dyeing wastewater - Google Patents

Abstract

Provided is a processing method for printing and dyeing wastewater. The method comprises the steps of CO2 neutralization, pressurized manganese zinc composite powder reduction, hydrolytic acidification, aerobiosis, biological filtration tower and the like. The processed wastewater can stably meet discharge standard.

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 sulfuric 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 basin, irregularly sludge is extracted out from sedimentation basin and is filtered, filter cake is made at dangerous solid waste Put, filtrate returns sedimentation basin.The supernatant of sedimentation basin sends into voltage-resistant reactor, and cleaning MnZn composite powder is added into reactor, and It is passed through industrial CO₂Reacted, the granularity of MnZn composite powder is less than 180 mesh, and every liter of waste water adds MnZn composite powder 5g～10g, The content of every kind of metal is not less than 5% in MnZn composite powder（The MnZn composite powder that return is used is not limited）, during stirring reaction Between be 1h～3h, reaction temperature be 25 DEG C～60 DEG C, CO₂Pressure be 0.1MPa～0.5MPa.Reacted waste water carries out liquid Gu separate, the MnZn composite powder Returning reactor isolated.Waste water milk of lime or other alkaline matters after solid-liquor separation is adjusted Its pH value is saved to 6～8, subsequently into sedimentation basin 1h～3h is precipitated, irregularly extracted sludge out from sedimentation basin and filtered, filter cake Make dangerous disposition of solid waste, filtrate returns sedimentation basin.The supernatant of sedimentation basin send hydrolysis acidification pool.Waste water is in hydrolysis acidification Normal temperature stops 4h～8h in pond.Waste water after hydrolysis acidification into biology aerobic pond normal temperature process, the Aerobic Process for Treatment time be 4h～ 10h.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 filters 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.It is biological The filler of filter tower is activated carbon or porous ceramic grain, is 0.5m～1.2m per thickness degree, and gross thickness is 1m～3m.Biological filtering tower combined working it is excellent Gesture bacterial classification 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 standard water discharge discharge of biological filtering tower combined working 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 MnZn composite powder and is destroyed, be that subsequent biochemical processes creation favorably Condition.It is passed through pressure CO₂Purpose be to maintain MnZn composite powder to reduce suitable pH value（2.0～5.0）, the waste water use after reduction Milk of lime or other alkaline matters adjust its pH, to meet sequential hydrolysis acidifying and the requirement of aerobic process.It is premenstrual to state process In Hydrolysis Acidification, by the effect of microorganism, larger molecular organicses further become small organic molecule to waste water, after being Continuous biological oxidation creates more favorable condition.By biological oxidation process, remaining most of organic matters are removed.Waste water is most laggard Enter activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly red pseudomonas, further remove organic Thing, 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 sulfuric acid is replaced to be acidified 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_Cr5700mg/L、BOD₅1150mg/L, colourity 330, aniline 24mg/L, T-N108mg/L）, through CO₂Adjust pH（6.5）, MnZn composite powder reduction（Every liter of waste water adds MnZn composite powder 5g、3h、25℃、CO₂Pressure 0.1MPa）, hydrolysis acidification（4h）, aerobic biochemical（4h）With activated carbon biological filtering tower combined working（Hydraulic load For 100m³/m².d, activated carbon gross thickness 1m）Process, effluent quality is COD_Cr70mg/L、BOD₅10mg/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）, CO₂Adjust pH（6.8）, MnZn composite powder reduction（Every liter of waste water adds MnZn to answer Close powder 10g, 1h, 40 DEG C, CO₂Pressure 0.3MPa）, hydrolysis acidification（6h）, aerobic biochemical（6h）With porous ceramic grain biological filtering tower combined working（Water Power load is 150m³/m².d, porous ceramic grain gross thickness 2m）Process, effluent quality is COD_Cr58mg/L、BOD₅8mg/L, colourity 9, T-N13mg/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 sedimentation basin, and the supernatant of sedimentation basin sends into voltage-resistant reactor, and cleaning MnZn composite powder is added Enter reactor, and be passed through industrial CO₂Reacted, the granularity of MnZn composite powder is less than 180 mesh, and every liter of waste water adds MnZn to be combined Powder 5g～10g, the content of every kind of metal is not less than 5% in MnZn composite powder, and the stirring reaction time is 1h～3h, and reaction temperature is 25 DEG C～60 DEG C, CO₂Pressure be 0.1MPa～0.5MPa, reacted waste water carries out solid-liquor separation, and the MnZn isolated is answered Powder Returning reactor is closed, the waste water milk of lime or other alkaline matters after solid-liquor separation adjusts its pH value to 6～8, Ran Houjin 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 sedimentation basin, and the supernatant of sedimentation basin send hydrolysis acidification pool, waste water normal temperature in hydrolysis acidification pool to stop 4h～8h, water Waste water after solution acidifying is 4h～10h into the process of biology aerobic pond normal temperature, Aerobic Process for Treatment time, and the waste water after Aerobic Process for Treatment enters 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 Aerobic Pond, and 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 many Hole haydite, filler gross thickness is 1m～3m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, biological filtering tower combined working Hydraulic load be 50 m³/m².d～150m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.