CN106630437A - Method for treating coal tar waste water - Google Patents

Abstract

The invention discloses a method for treating coal tar waste water. The method comprises the procedures of CO2 pressurizing, iron powder reducing, anaerobic, aerobiotic and biological tower treatment under the action of ultrasonic waves and the like. The treated waste water can be stably drained after reaching 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 powder reactor is added, and is passed through industrial CO₂Reacted, the granularity of iron powder is less than 180 mesh, and per liter is given up Water adds iron powder 10g～50g, and mechanical agitation and the reaction time under ul-trasonic irradiation are 20min～40min, reaction temperature For 25 DEG C～60 DEG C, 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 powder Returning reactor isolated.Waste water lime after solid-liquor separation Breast or other alkaline matters adjust its pH value to 6.8～8.5,1h～3h are precipitated subsequently into sedimentation basin, irregularly from sedimentation basin Middle extraction sludge is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation basin.The supernatant waste water of sedimentation basin send Anaerobic reactor.Waste water stops 24h～120h in anaerobic reactor, and anaerobism temperature is 25 DEG C～55 DEG C.Waste water after anaerobism Into the process of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 8h～16h.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 filter 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.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, per thickness Spend for 1.0m～2.0m, gross thickness is 2m～6m.The dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria （Rhodopseudomonas）.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 reaches Mark discharge or reuse.

The object of the present invention is achieved like this, and Coal Tar Wastewater is entered after iron powder reducing reactor, big point in waste water Sub- organic matter, particularly persistence organic pollutant（Containing phenyl ring and（Or）The organic matter of heterocycle etc.）Produced by iron powder reducing Reduce the effect of free radical by force and destroy, be that subsequent biochemical process creates favorable conditions.It is passed through pressure CO₂Purpose be maintain iron Powder reduces suitable pH value（2.0～5.0）, being input into ultrasonic wave can add the mass transport process of fast response.Waste water stone after reduction Grey breast or other alkaline matters adjust its pH value, to 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, larger molecular organicses further become small organic molecule, are subsequent bio oxygen Change and create more favorable condition.By biological oxidation process, remaining most of organic matters are removed, while go to denitrogenate to wait polluting Thing.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly red pseudomonas, enters The pollutant such as one step 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）, Jing iron powder reducings（20min、40℃、CO₂Pressure 0.6MPa, every liter of waste water add iron powder 40g, per cubic metre The ultrasonic power 4kW of waste water input）, anaerobism（PH8.5,72h, 25 DEG C～35 DEG C）, it is aerobic（12h）And biological filtering tower combined working（Porous Ceramics filling layer gross thickness 4m, hydraulic load 35m³/m².d）The pollutant levels of water outlet are respectively COD after process_Cr 63mg/L、 NH₃- N 6.8mg/L, volatile phenol 0.3mg/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）, Jing iron powder reducings（40min、25℃、CO₂Pressure 0.1MPa, every liter of waste water add iron powder 10g, per cubic metre The ultrasonic power 2kW of waste water input）, anaerobism（PH6.8,24h, 35 DEG C～55 DEG C）, it is aerobic（8h）And biological filtering tower combined working（Activated carbon Packing layer gross thickness 2m, hydraulic load 90m³/m².d）The pollutant levels of water outlet are respectively COD after process_Cr 53mg/L、NH₃-N 5.5mg/L, volatile phenol 0.2mg/L, CN^-0.09mg/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 powder reactor is added, and is passed through industrial CO₂Reacted, the granularity of iron powder is less than 180 mesh, per liter Waste water adds iron powder 10g～50g, and mechanical agitation and the reaction time under ul-trasonic irradiation are 20min～40min, and reaction is warm Spend for 25 DEG C～60 DEG C, 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 powder Returning reactor isolated, the waste water lime after solid-liquor separation Breast or other alkaline matters adjust its pH value to 6.8～8.5,1h～3h are precipitated subsequently into sedimentation basin, irregularly from sedimentation basin Middle extraction sludge is filtered, and 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 stops 24h～120h in anaerobic reactor, and anaerobism temperature is 25 DEG C～55 DEG C, the waste water after anaerobism Into the process of biology aerobic pond normal temperature, 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 extracts sludge out from sedimentation basin and is filtered, and filter 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, and the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, and filler is total Thickness is 2m～6m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, and the hydraulic load of biological filtering tower combined working is 30 m³/m².d～90m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.