CN106673310A - Treatment method of chemical organic waste water - Google Patents

Abstract

The invention relates to a treatment method of chemical organic waste water. The method comprises the steps of CO2 pressurizing zinc powder reduction, anaerobic treatment, aerobic treatment, biofilter treatment and the like. The treated waste water can be discharged stably to reach the standard.

Description

The processing method of chemical industrial organic wastewater

Technical field

The present invention relates to a kind of processing method of chemical industrial organic wastewater.

Background technology

Organic chemical industry is one of mainstay of the national economy industry, the organic waste water pollutant COD concentration that its production is produced Height, complicated component particularly contains persistence organic pollutant（Containing phenyl ring and（Or）The Organic substance of heterocycle etc.）When, intractability Greatly.If the waste water is not processed is directly discharged into environment, severe contamination will be caused to environment.At present containing persistence organic pollutant The processing method of chemical industrial organic wastewater mainly first carries out advanced oxidation（Such as iron-carbon micro-electrolysis, metal powder reduction, Fenton methods Deng）Pretreatment, then carries out a biological disposal upon.In advanced oxidation preprocessing process, sulphuric acid is generally needed to be added, caused at subsequent bio Reason（Such as anaerobism, hydrolysis acidification）During produce H₂S, produces more serious secondary pollution；Simultaneously because SO₄ ^2-To microorganism Growth has obvious inhibitory action, affects biological treatment effect, waste water to be difficult to stably reaching standard discharge.Exploitation secondary pollution is little, energy The processing method of the chemical industrial organic wastewater of stably reaching standard discharge has larger practical value.

The content of the invention

For the problem of current chemical industrial organic wastewater processing method, the purpose of the present invention be find secondary pollution it is little, can be steady Determine the processing method of the chemical industrial organic wastewater of qualified discharge, it is characterised in that pH value is more than into 5.0, and after adjusted pond is adjusted Chemical industrial organic wastewater containing persistence organic pollutant sends into voltage-resistant reactor, and cleaning zinc powder is added into reactor, and is passed through work Industry CO₂Reacted, the granularity of zinc powder is less than 180 mesh, every liter of waste water adds zinc powder 5g~30g, the stirring reaction time be 1h~ 3h, reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, point The zinc powder Returning reactor for separating out.Waste water lime cream or other alkaline matters after solid-liquor separation adjust its pH value to 6.8~ 8.5,1h~3h is precipitated subsequently into sedimentation tank, irregularly to extract sludge out from sedimentation tank and filtered, filter cake makees dangerous solid Waste treatment, filtrate returns sedimentation tank.The supernatant waste water of sedimentation tank send anaerobic reactor.Waste water is stopped in anaerobic reactor 24h~120h, anaerobism temperature is 25 DEG C~55 DEG C.Waste water after anaerobism is processed into biology aerobic pond room temperature, during Aerobic Process for Treatment Between be 6h~16h.Waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h~3h, and irregularly extracting sludge out from sedimentation tank is carried out Filter, filter cake makees dangerous disposition of solid waste, filtrate returns Aerobic Pond.The supernatant waste water of sedimentation tank is sent at multi-layer biological filter tower Reason.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, is 1.0m~2.0m per thickness degree, and gross thickness is 2m~6m.It is biological The dominant bacteria of filter tower is the rhodopseudomonas in photosynthetic bacteria（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d~90m³/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 chemical industrial organic wastewater is entered after Zinc Powder Reduction device, big in waste water Molecular organic, particularly persistence organic pollutant（Containing phenyl ring and（Or）The Organic substance of heterocycle etc.）Produced by zinc powder reduction Strong reduction free radical effect and destroy, be subsequent biochemical process create favorable conditions.It is passed through pressure CO₂Purpose be maintain The suitable pH value of zinc powder reduction（2.0~5.0）, the waste water lime cream or other alkaline matters after reduction adjust its pH value, with Meet the requirement of follow-up anaerobic and aerobic process.The premenstrual waste water for stating process in anaerobic processes, by the effect of microorganism, greatly Molecular organic further becomes small organic molecule, is that more favorable condition is created in subsequent bio oxidation.At biological oxidation Reason, remaining most of Organic substances are removed, while going to denitrogenate the pollutant such as phosphorus.Waste water finally enters activated carbon or porous ceramic grain Biological filtering tower combined working, in the presence of microorganism, particularly rhodopseudomonas, the pollutant such as further organics removal and nitrogen phosphorus are protected Waste water stably reaching standard discharge after card process.

Relative to existing method（Iron-carbon micro-electrolysis, metal powder reduction, Fenton methods etc.）, the outstanding advantages of the present invention are to adopt Use CO₂Replace now widely used sulphuric acid to make acidulant, do not introduce SO₄ ^2-Ion, essentially eliminates generation H₂The material base of S （Part chemical industrial organic wastewater contains S）, so as to significantly reduce H₂The pollution of S, while it also avoid SO₄ ^2-To anaerobic and aerobic mistake The inhibitory action of microorganism in journey, greatly improves the efficiency of biological treatment；Chemical plant all has boiler, what fuel combustion was produced CO₂Waste gas can make full use of, and can not only reduce processing cost, and can reduce carbon emission；Waste water energy after process stably reaches Mark discharge, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：1m is processed daily³Chemical industrial organic wastewater（Composition：pH6.7、COD_Cr11400mg/L、T-N52.5 mg/L、T- P35.1mg/L, colourity 250）, Jing zinc powder reductions（1h、40℃、CO₂Pressure 0.6MPa, every liter of waste water add zinc powder 25g）, anaerobism （PH8.5,72h, 25 DEG C~35 DEG C）, it is aerobic（12h）And biological filtering tower combined working（Porous ceramic grain packing layer gross thickness 4m, hydraulic load 35m³/m².d）The COD of water outlet after process_CrFor 55mg/L, T-N13.2mg/L, T-P0.5mg/L, colourity 14.

Embodiment 2：5m is processed daily³Synthesis pharmaceutical organic wastewater（Composition：pH5.7、COD_Cr6500 mg/L、T-N31.3 Mg/L, T-P23.2mg/L, colourity 300）, Jing zinc powder reductions（3h、25℃、CO₂Pressure 0.1MPa, every liter of waste water add zinc powder 5g）, anaerobism（PH6.8,24h, 35 DEG C~55 DEG C）, it is aerobic（6h）And biological filtering tower combined working（Active carbon filler layer gross thickness 2m, waterpower are born Lotus 90m³/m².d）The COD of water outlet after process_CrFor 53mg/L, T-N10.1mg/L, T-P0.5mg/L, colourity 12.

Claims (1)

1. a kind of processing method of chemical industrial organic wastewater, it is characterised in that pH value is more than into 5.0, and after adjusted pond is adjusted Chemical industrial organic wastewater containing persistence organic pollutant sends into voltage-resistant reactor, and cleaning zinc powder is added into reactor, and is passed through work Industry CO₂Reacted, the granularity of zinc powder is less than 180 mesh, every liter of waste water adds zinc powder 5g~30g, the stirring reaction time be 1h~ 3h, reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa, reacted waste water carries out solid-liquor separation, point The zinc powder Returning reactor for separating out, the waste water lime cream or other alkaline matters after solid-liquor separation adjust its pH value to 6.8~ 8.5,1h~3h is precipitated subsequently into sedimentation tank, irregularly to extract sludge out from sedimentation tank and filtered, filter cake makees dangerous solid Waste treatment, filtrate returns sedimentation tank, and the supernatant of sedimentation tank send anaerobic reactor, waste water to stop 24h in anaerobic reactor ~120h, anaerobism temperature is 25 DEG C~55 DEG C, and the waste water after anaerobism is into the process of biology aerobic pond room temperature, Aerobic Process for Treatment time 6h~16h, the waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h~3h, and irregularly extracting sludge out from sedimentation tank was carried out Filter, filter cake makees dangerous disposition of solid waste, and filtrate returns Aerobic Pond, and the supernatant waste water of sedimentation tank is sent at multi-layer biological filter tower Reason, the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, and filler gross thickness is 2m~6m, and the dominant bacteria of biological filtering tower combined working is light The rhodopseudomonas in antibacterial are closed, the hydraulic load of biological filtering tower combined working is 30 m³/m².d~90m³/m².d, the water outlet of biological filtering tower combined working Qualified discharge or reuse.