CN106517693A - Coal tar wastewater treatment method - Google Patents

Abstract

The invention discloses a coal tar wastewater treatment method. The coal tar wastewater treatment method comprises the processes of CO2 pressurization, reducing, anaerobic, aerobic and biological filter-tower treatment conducted on iron-zinc composite powder under the effect of ultrasonic waves and the like, and stable and up-to-standard discharge of wastewater obtained after treatment can be achieved.

Description

The processing method of Coal Tar Wastewater

Technical field

The present invention relates to a kind of processing method of the waste water of coal tar processing and 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 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 atmospheric pollution.Biological treatment Method needs first to carry out advanced oxidation（Such as iron-carbon micro-electrolysis, metal powder reduction, Fenton methods etc.）Pretreatment, then carries out a biological disposal upon. In advanced oxidation preprocessing process, need to add sulphuric 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 are 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 Cleaning ferrum zinc composite powder is added reactor, and is passed through industrial CO by reactor₂Reacted.The granularity of ferrum zinc composite powder is less than 180 mesh, in ferrum zinc composite powder, the content of every kind of metal is not less than 5%（The ferrum zinc composite powder that return is used is not limited）, per liter It is 20min～40min that waste water adds ferrum zinc composite powder 10g～50g, mechanical agitation the response time under ul-trasonic irradiation, Reaction temperature is 25 DEG C～60 DEG C, and the power of every cubic metre of waste water input ultrasound wave is 2kW～8kW, CO₂Pressure be 0.1MPa～1.0MPa.Reacted waste water carries out solid-liquor separation, the ferrum zinc composite powder Returning reactor isolated.Solid-liquor separation Waste water lime cream or other alkaline matters afterwards adjusts its pH value to 6.8～8.5, precipitates 1h～3h subsequently into sedimentation tank, Irregularly extract sludge out from sedimentation tank to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation tank.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 room temperature, the Aerobic Process for Treatment time is 8h～16h to waste water after anaerobism.Waste water after Aerobic Process for Treatment 1h～3h being precipitated into sedimentation tank, irregularly sludge being extracted out from sedimentation tank and is filtered, filter cake is made at dangerous solid waste Put, filtrate returns Aerobic Pond.The supernatant waste water of sedimentation tank 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.During the dominant bacteria of biological filtering tower combined working is photosynthetic bacteria Rhodopseudomonas（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, after Coal Tar Wastewater enters ferrum zinc composite powder reduction reactor, in waste water Larger molecular organicses, particularly persistence organic pollutant（Containing phenyl ring and（Or）The Organic substance of heterocycle etc.）It is compound by ferrum zinc 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 ferrum zinc composite powder to reduce suitable pH value（2.0～5.0）, it is input into the mass transfer mistake that ultrasound wave can be accelerated to react Journey.Waste water lime cream 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 substance, is that more favorable condition is created in subsequent bio oxidation.By biological oxidation process, remaining most of Organic substances 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, in microorganism, particularly red In the presence of pseudomonass, 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 sulphuric 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 ferrum zinc composite powder（20min、40℃、CO₂Pressure 0.6MPa, every liter of waste water add ferrum zinc composite powder 40g, the ultrasonic power 4kW of every cubic metre of waste water input）, 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）After process, the pollutant levels of water outlet are respectively COD_Cr 53mg/L、NH₃- N 5.7mg/L, volatile phenol 0.2mg/L, CN^-0.09mg/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 ferrum zinc composite powder（40min、25℃、CO₂Pressure 0.1MPa, every liter of waste water add ferrum zinc composite powder 10g, the ultrasonic power 2kW of every cubic metre of waste water input）, 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）After process, the pollutant levels of water outlet are respectively COD_Cr 40mg/L、NH₃- N 5.0mg/L, volatile phenol 0.1mg/L, CN^-0.06mg/L。

Claims (1)

1. a kind of processing method of Coal Tar Wastewater, it is characterised in that will adjusted pond adjust after Coal Tar Wastewater send into it is resistance to Cleaning ferrum zinc composite powder is added reactor, and is passed through industrial CO by pressure reactor₂Reacted, the granularity of ferrum zinc composite powder is little In 180 mesh, ferrum zinc composite powder, the content of every kind of metal is not less than 5%, and every liter of waste water adds ferrum zinc composite powder 10g～50g, machine Tool is stirred and the response 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 ultrasound wave is 2kW～8kW, CO₂Pressure be 0.1MPa～1.0MPa, reacted waste water carries out liquid Gu separating, the ferrum zinc composite powder Returning reactor isolated, the waste water lime cream or other alkaline matters after solid-liquor separation is adjusted Its pH value is saved to 6.8～8.5,1h～3h is precipitated subsequently into sedimentation tank, irregularly extract sludge out from sedimentation tank and filtered, Filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation tank, and the supernatant waste water of sedimentation tank send anaerobic reactor, waste water detesting 24h～120h is stopped in oxygen reactor, and anaerobism temperature is 25 DEG C～55 DEG C, and the waste water after anaerobism enters biology aerobic Chi Changwenchu Reason, Aerobic Process for Treatment time are 8h～16h, and the waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h～3h, irregularly from sedimentation tank 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 tank 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 rhodopseudomonas 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.