CN106630448A - Coal tar wastewater treatment method - Google Patents

Abstract

The invention provides a coal tar wastewater treatment method. The method comprises steps of CO2 pressurization for reduction of iron and aluminium composite powder under ultrasonic action, anaerobic treatment, aerobic treatment, biofilter treatment and the like, and the treated wastewater can be stably discharged up to the standard.

Description

The processing method of Coal Tar Wastewater

Technical field

The present invention relates to a kind of processing method of coal tar processing and the waste water of storage process generation.

Background technology

Coal tar is one of important source material of production of chemicals, the Pollutants in Wastewater that its processing and storage process are produced COD concentration is high, complicated component, and toxicity is big, and containing a large amount of persistence organic pollutants（Containing phenyl ring and（Or）Heterocycle etc. it is organic Thing）, intractability is big.If the waste water is not processed is directly discharged into environment, severe contamination will be caused to environment.Current Coal Tar Wastewater Processing method mainly have burning method and biological treatment.Burning method processing cost is high, and produces atmosphere pollution.Biological treatment Method needs first to carry out advanced oxidation（Such as iron-carbon micro-electrolysis, metal powder reduction, Fenton methods）Pretreatment, then carries out a biological disposal upon. In advanced oxidation preprocessing process, need to add sulfuric acid, cause subsequent biological treatment（Such as anaerobism, hydrolysis acidification）During produce Raw H₂S, produces more serious secondary pollution；Simultaneously because SO₄ ^2-Growth to microorganism has obvious inhibitory action, affects life Thing treatment effect, waste water is difficult to stably reaching standard discharge.Exploitation secondary pollution is little, processing cost is low, the coal of energy stably reaching standard discharge The processing method of tar and waste water has larger practical value.

The content of the invention

For the problem of current Coal Tar Wastewater processing method, the purpose of the present invention is that searching secondary pollution is little, can stablize The processing method of the Coal Tar Wastewater of qualified discharge, it is characterised in that the Coal Tar Wastewater after adjusted pond is adjusted is sent into pressure Reactor, by cleaning iron aluminium composite powder reactor is added, and is passed through industrial CO₂Reacted.The granularity of iron aluminium composite powder is less than 180 mesh, the content of every kind of metal is not less than 5% in iron aluminium composite powder（The iron aluminium composite powder that return is used is not limited）, per liter Waste water adds iron aluminium composite powder 10g～50g, and mechanical agitation and the reaction time under ul-trasonic irradiation are 20min～40min, Reaction temperature is 25 DEG C～60 DEG C, and the power of every cubic metre of waste water input ultrasonic wave is 2kW～8kW, CO₂Pressure be 0.1MPa～1.0MPa.Reacted waste water carries out solid-liquor separation, the iron aluminium composite powder Returning reactor isolated.Solid-liquor separation Waste water milk of lime or other alkaline matters afterwards adjusts its pH value to 6.8～8.5, and subsequently into sedimentation basin 1h～3h is precipitated, Irregularly extract sludge out from sedimentation basin to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation basin.Precipitation The supernatant waste water in pond send anaerobic reactor.Waste water stops 24h～120h in anaerobic reactor, and anaerobism temperature is 25 DEG C～55 ℃.Into the process of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 8h～16h to waste water after anaerobism.Waste water after Aerobic Process for Treatment 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 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 be activated carbon or Porous ceramic grain, is 1.0m～2.0m per thickness degree, and gross thickness is 2m～6m.The dominant bacteria of biological filtering tower combined working is in photosynthetic bacteria Red pseudomonas（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d～90m³/m².d.Biological filter The standard water discharge discharge of tower or reuse.

The object of the present invention is achieved like this, and Coal Tar Wastewater is entered after iron aluminium composite powder reduction reactor, in waste water Larger molecular organicses, particularly persistence organic pollutant（Containing phenyl ring and（Or）The organic matter of heterocycle etc.）It is compound by iron aluminium Powder reduces the effect of the strong reduction free radical for producing and destroys, and is that subsequent biochemical process creates favorable conditions.It is passed through pressure CO₂'s Purpose is to maintain iron aluminium composite powder to reduce suitable pH value（2.0～5.0）, being input into ultrasonic wave can add the mass transfer mistake of fast response Journey.Waste water milk of lime or other alkaline matters after reduction adjusts its pH value, to meet wanting for follow-up anaerobic and aerobic process Ask.In anaerobic processes, by the effect of microorganism, larger molecular organicses further become small molecule to the premenstrual waste water for stating process Organic matter, is that more favorable condition is created in subsequent bio oxidation.By biological oxidation process, remaining most of organic matters are gone Remove, while the pollutant such as removing to denitrogenate.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, particularly red in microorganism In the presence of pseudomonad, the pollutant such as further organics removal and nitrogen, it is ensured that the waste water stably reaching standard discharge after 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 sulfuric acid to make acidulant, do not introduce SO₄ ^2-Ion, essentially eliminates generation H₂The material base of S （Coal Tar Wastewater contains a small amount of 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；Burner, fuel combustion are all had in coal tar processing factory Burn the CO for producing₂Waste gas can make full use of, and can not only reduce processing cost, and can reduce carbon emission；Waste water after process Energy stably reaching standard discharge, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：Day processes 1 cubic metre of Coal Tar Wastewater（Volatile phenol 2400mg/L, COD15500mg/L, CN^-25.5mg/L、 NH₃-N57mg/L）, the reduction of Jing iron aluminium composite powder（20min、40℃、CO₂Pressure 0.6MPa, every liter of waste water add iron aluminium composite powder The ultrasonic power 4kW that 40g, every cubic metre of waste water are input into）, anaerobism（PH8.5,72h, 25 DEG C～35 DEG C）, it is aerobic（12h）And life Thing filter tower（Porous ceramic grain packing layer gross thickness 4m, hydraulic load 35m³/m².d）The pollutant levels of water outlet are respectively after process COD_Cr 53mg/L、NH₃- N 6.0mg/L, volatile phenol 0.2mg/L, CN^-0.11mg/L。

Embodiment 2：Day processes 3 cubic metres of Coal Tar Wastewaters（Volatile phenol 920mg/L, COD8700mg/L, CN^-17mg/L、 NH₃-N48mg/L）, the reduction of Jing iron aluminium composite powder（40min、25℃、CO₂Pressure 0.1MPa, every liter of waste water add iron aluminium composite powder The ultrasonic power 2kW that 10g, every cubic metre of waste water are input into）, anaerobism（PH6.8,24h, 35 DEG C～55 DEG C）, it is aerobic（8h）And life Thing filter tower（Active carbon filler layer gross thickness 2m, hydraulic load 90m³/m².d）The pollutant levels of water outlet are respectively after process COD_Cr 47mg/L、NH₃- N 5.9mg/L, volatile phenol 0.2mg/L, CN^-0.07mg/L。

Claims (1)

1. a kind of processing method of Coal Tar Wastewater, it is characterised in that the Coal Tar Wastewater after adjusted pond is adjusted is sent into resistance to Pressure reactor, by cleaning iron aluminium composite powder reactor is added, and is passed through industrial CO₂Reacted, the granularity of iron aluminium composite powder is little The content of every kind of metal is not less than 5% in 180 mesh, iron aluminium composite powder, and every liter of waste water adds iron aluminium composite powder 10g～50g, machine Tool is stirred and the reaction time under ul-trasonic irradiation is 20min～40min, and reaction temperature is 25 DEG C～60 DEG C, per cubic metre The power of waste water input ultrasonic wave is 2kW～8kW, CO₂Pressure be 0.1MPa～1.0MPa, reacted waste water carries out liquid Gu separating, the iron aluminium composite powder Returning reactor isolated, the waste water milk of lime or other alkaline matters after solid-liquor separation is adjusted Its pH value is saved to 6.8～8.5, subsequently into sedimentation basin 1h～3h is precipitated, irregularly extracted sludge out from sedimentation basin and filtered, Filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation basin, and the supernatant waste water of sedimentation basin send anaerobic reactor, waste water detesting 24h～120h is stopped in oxygen reactor, anaerobism temperature is 25 DEG C～55 DEG C, and the waste water after anaerobism enters biology aerobic Chi Changwenchu Reason, the Aerobic Process for Treatment time is 8h～16h, and the waste water after Aerobic Process for Treatment enters sedimentation basin and precipitates 1h～3h, irregularly from sedimentation basin Middle extraction sludge is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns Aerobic Pond, and the supernatant waste water of sedimentation basin send The process of multi-layer biological filter tower, the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, and filler gross thickness is 2m～6m, biological filtering tower combined working Dominant bacteria be red pseudomonas in photosynthetic bacteria, 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.