CN106698842A - Treatment method of coal tar wastewater - Google Patents

Abstract

A treatment method of coal tar wastewater, disclosed in the invention, comprises the processes of CO2 pressurized aluminum powder reduction under the action of ultrasonic waves, anaerobic treatment, aerobic treatment and biological filtration tower treatment, and treated wastewater is discharged after stably reaching standards.

Description

The processing method of Coal Tar Wastewater

Technical field

A kind of processing method of the waste water produced the present invention relates to coal tar processing and storage process.

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 contains 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 biological treatment. , it is necessary to add sulfuric acid in advanced oxidation preprocessing process, cause subsequent biological treatment（Such as anaerobism, hydrolysis acidification）During produce Raw H₂S, produces more serious secondary pollution；Simultaneously because SO₄ ^2-There are obvious inhibitory action, influence life to the growth of microorganism Thing treatment effect, waste water is difficult to stably reaching standard discharge.Exploitation secondary pollution is small, 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 small, can stablize The processing method of the Coal Tar Wastewater of qualified discharge, it is characterised in that the Coal Tar Wastewater feeding after adjusted pond is adjusted is pressure-resistant Reactor, adds reactor, and be passed through industrial CO by cleaning aluminium powder₂Reacted, the granularity of aluminium powder is less than 180 mesh, and every liter is given up Water adds aluminium powder 10g~50g, and mechanical agitation and the reaction time under ul-trasonic irradiation are 20min~40min, reaction temperature It it is 25 DEG C~60 DEG C, the power of every cubic metre of waste water input ultrasonic wave is 2kW~8kW, CO₂Pressure for 0.1MPa~ 1.0MPa.Reacted waste water carries out solid-liquor separation, the aluminium 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 to sedimentation basin.The supernatant waste water of sedimentation basin send Anaerobic reactor.Waste water stops 24h~96h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C.Waste water after anaerobism enters The normal temperature treatment of biology aerobic pond, the Aerobic Process for Treatment time is 8h~16h.Waste water after Aerobic Process for Treatment enter sedimentation basin precipitation 1h~ 3h, irregularly extracts sludge out from sedimentation basin and 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 to process.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, per thickness degree It is 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, after Coal Tar Wastewater enters aluminum reduction 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 aluminum reduction Reduce the effect of free radical by force and destroy, be that subsequent biochemical treatment creates favorable conditions.It is passed through pressure CO₂Purpose be maintain aluminium Powder reduces suitable pH value（2.0~5.0）, being input into ultrasonic wave can accelerate the mass transport process of reaction.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.Through the waste water of aforementioned processing 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.Processed by biological oxidation, 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 treatment.

Relative to existing method（Iron-carbon micro-electrolysis, metal powder reduction, Fenton methods etc.）, outstanding advantages of the invention are to adopt Use CO₂Make acidulant instead of now widely used sulfuric acid, 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 treatment Energy stably reaching standard discharge, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：1 cubic metre of Coal Tar Wastewater of day treatment（Volatile phenol 2400mg/L, COD15500mg/L, CN^-25.5mg/L、 NH₃-N57mg/L）, through aluminum reduction（20min、40℃、CO₂Pressure 0.6MPa, every liter of waste water add aluminium powder 40g, every 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（It is porous Ceramics filling layer gross thickness 4m, hydraulic load 35m³/m².d）The pollutant concentration of water outlet is respectively COD after treatment_Cr 69mg/L、 NH₃- N 7.3mg/L, volatile phenol 0.4mg/L, CN^-0.12mg/L。

Embodiment 2：3 cubic metres of Coal Tar Wastewaters of day treatment（Volatile phenol 920mg/L, COD8700mg/L, CN^-17mg/L、 NH₃-N48mg/L）, through aluminum reduction（40min、25℃、CO₂Pressure 0.1MPa, every liter of waste water add aluminium powder 10g, every 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 concentration of water outlet is respectively COD after treatment_Cr 57mg/L、NH₃-N 5.9mg/L, volatile phenol 0.3mg/L, CN^-0.10mg/L。

Claims (1)

1. a kind of processing method of Coal Tar Wastewater, it is characterised in that the Coal Tar Wastewater feeding after adjusted pond is adjusted is resistance to Pressure reactor, adds reactor, and be passed through industrial CO by cleaning aluminium powder₂Reacted, the granularity of aluminium powder is less than 180 mesh, every liter Waste water adds aluminium powder 10g~50g, and mechanical agitation and the reaction time under ul-trasonic irradiation are 20min~40min, reaction temperature It is 25 DEG C~60 DEG C to spend, and the power of every cubic metre of waste water input ultrasonic wave is 2kW~8kW, CO₂Pressure for 0.1MPa~ 1.0MPa, reacted waste water carries out solid-liquor separation, the aluminium 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 to 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 treatment 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.