CN106673346A - Method for treating wastewater with coal tar - Google Patents

Abstract

The invention provides a method for treating wastewater with coal tar. The method includes working procedures of CO2 pressurization and manganese and zinc composite powder reduction, anaerobic, aerobic and biological filtration tower treatment and the like. The method has the advantage that the wastewater treated by the aid of the method can stably reach standards and then can be discharged.

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 MnZn composite powder reactor is added, and is passed through industrial CO₂Reacted, the granularity of MnZn composite powder is less than 180 mesh, the content of every kind of metal is not less than 5% in MnZn composite powder（The MnZn composite powder that return is used is not limited）, per liter Waste water adds MnZn composite powder 10g~50g, and the stirring reaction time is 1h~3h, and reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure Power is 0.1MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, the MnZn composite powder Returning reactor isolated.Liquid is consolidated Waste water milk of lime or other alkaline matters after separation adjusts its pH value to 6.8~8.5, subsequently into 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 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℃.Into the process of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 8h~16h to waste water after anaerobism.It is useless after Aerobic Process for Treatment Water enters sedimentation basin and precipitates 1h~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous solid waste Dispose, 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, it is 1.0m~2.0m per thickness degree, 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.It is biological The standard water discharge discharge of filter tower or reuse.

The object of the present invention is achieved like this, and Coal Tar Wastewater is entered after MnZn 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 MnZn 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 MnZn composite powder to reduce suitable pH value（2.0~5.0）, the waste water milk of lime or other basic species after reduction Matter adjusts its pH value, to meet the requirement of follow-up anaerobic and aerobic process.The premenstrual waste water for stating process passes through in anaerobic processes The effect of microorganism, larger molecular organicses further become small organic molecule, are that more favorable condition is created in subsequent bio oxidation. By biological oxidation process, remaining most of organic matters are removed, while the pollutant such as removing to denitrogenate.Waste water finally enters activity Charcoal or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly red pseudomonas, further organics removal and nitrogen etc. Pollutant, 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 MnZns composite powder（1h、40℃、CO₂Pressure 0.6MPa, every liter of waste water add MnZn composite powder 40g）, 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, water Power load 35m³/m².d）The pollutant levels of water outlet are respectively COD after process_Cr 63mg/L、NH₃- N 8.6mg/L, volatile phenol 0.3mg/L、CN^-0.12mg/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 MnZns composite powder（3h、25℃、CO₂Pressure 0.1MPa, every liter of waste water add MnZn composite powder 10g）, anaerobism（PH6.8,24h, 35 DEG C~55 DEG C）, it is aerobic（8h）And biological filtering tower combined working（Active carbon filler layer gross thickness 2m, waterpower Load 90m³/m².d）The pollutant levels of water outlet are respectively COD after process_Cr 49mg/L、NH₃- N 5.9mg/L, volatile phenol 0.2mg/L、CN^-0.08mg/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 MnZn composite powder reactor is added, and is passed through industrial CO₂Reacted, the granularity of MnZn composite powder is little The content of every kind of metal is not less than 5% in 180 mesh, MnZn composite powder, and every liter of waste water adds MnZn composite powder 10g~50g, stirs The reaction time is mixed for 1h~3h, reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa, it is reacted useless Water carries out solid-liquor separation, the MnZn composite powder Returning reactor isolated, the waste water milk of lime or other alkali after solid-liquor separation Property material adjust its pH value to 6.8~8.5, precipitate 1h~3h subsequently into sedimentation basin, irregularly extract sludge out from sedimentation basin Filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation basin, and the supernatant waste water of sedimentation basin send anaerobic reaction Device, waste water stops 24h~120h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C, and the waste water after anaerobism enters biological Aerobic Pond normal temperature process, 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, no Periodically extract sludge out from sedimentation basin to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns Aerobic Pond, sedimentation basin Supernatant waste water send multi-layer biological filter tower to process, the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, is 1.0m per thickness degree ~2.0m, gross thickness is 2m~6m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, the water of biological filtering tower combined working Power load is 30 m³/m².d~90m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.