CN106673341A - Method for treating phenol and cyanide wastewater generated by gas producers - Google Patents

Abstract

The invention discloses a method for treating phenol and cyanide wastewater generated by gas producers. The method includes filtering, CO2 pressurization and manganese powder reduction, precipitation, hydrolytic acidification, aerobic and biological filtration tower treatment working procedures and the like. The method has the advantages that the phenol and cyanide wastewater treated by the aid of the method can stably reach standards and then can be discharged.

Description

The processing method of the wastewater containing phenol and cyanide that gas generator is produced

Technical field

The present invention relates to a kind of processing method of the wastewater containing phenol and cyanide of gas generator generation.

Background technology

Coal gas is a class widely used fuel in production and life, and it is to be by one in gas generator by coal Row chemical reaction and be obtained.During cooled coal gas is prepared, wastewater containing phenol and cyanide is inevitably resulted from（Waste water containing phenol and cyanogen）, If the waste water is directly discharged into environment and will cause severe contamination to environment.The processing method of wastewater containing phenol and cyanide mainly has biochemistry at present Processing method, independent burning method, controlling the water circulation coal slurry facture and it is mixed into drying tower Feedstock treating method.The process of biochemistry treatment method Effect is unstable, relatively costly；Although individually very well, processing cost is very high for burning method treatment effect；Controlling the water circulation coal slurry facture Coal slurry industry investment it is big, many producers are without this system, it is difficult to implement.It is mixed into drying tower Feedstock treating method, low-temperature zone It is a large amount of to evaporate, considerable part phenol and cyanogen is had neither part nor lot in chemical reaction and is entered air.Development cost is low, high treating effect The processing method of the wastewater containing phenol and cyanide that gas generator is produced has larger practical value.

The content of the invention

The problem of the processing method of the wastewater containing phenol and cyanide produced for current gas generator, the purpose of the present invention is at searching Reason low cost, the processing method of the wastewater containing phenol and cyanide of the gas generator generation of high treating effect, it is characterised in that coal gas is occurred The wastewater containing phenol and cyanide that stove is produced is filtered, the feeding voltage-resistant reactor after filtration, cleaning manganese powder is added reactor, and is passed through work Industry CO₂Reacted, the granularity of manganese powder is less than 180 mesh, every liter of waste water adds manganese powder 5g~10g, the stirring reaction time be 2h~ 4h, temperature are 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, separates The manganese powder Returning reactor for going out.Waste water lime cream or other alkaline matters after solid-liquor separation adjusts its pH value to 6~8, so Sedimentation tank being entered afterwards and precipitating 1h~3h, irregularly extracted sludge out from sedimentation tank and filtered, filter cake makees dangerous solid waste Dispose, filtrate returns sedimentation tank.The supernatant of sedimentation tank send hydrolysis acidification pool.Waste water in hydrolysis acidification pool room temperature stop 8h~ 24h.Into the process of biology aerobic pond room temperature, the Aerobic Process for Treatment time is 8h~12h to waste water after hydrolysis acidification.After Aerobic Process for Treatment Waste water enters sedimentation tank and precipitates 1h~3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous solid waste Thing is disposed, and 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 is activity Charcoal or porous ceramic grain, are 1m~2m 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~100m³/m².d.Biological filter The standard water discharge discharge of tower or reuse.

The object of the present invention is achieved like this：Waste water enters pressure manganese powder reduction reactor, and the macromole in waste water has Machine thing, particularly persistence organic pollutant（Organic substance containing phenyl ring, heterocycle）The strong reduction freedom for producing is reduced by manganese powder The effect of base and destroy, be subsequent biochemical process create favorable conditions.It is passed through pressure CO₂Purpose be to maintain manganese powder reduction suitable PH value（2.0~5.0）, the waste water lime cream or other alkaline matters after reduction adjusts its pH, to meet sequential hydrolysis acid Change the requirement with aerobic process.In Hydrolysis Acidification, by the effect of microorganism, macromole has the premenstrual waste water for stating process Machine thing further becomes small organic molecule, is that more favorable condition is created in subsequent bio oxidation.It is by biological oxidation process, remaining Most of Organic substances be removed.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in microorganism, particularly red vacation In the presence of Zymomonas mobiliss, further organics removal, it is ensured that the waste water stably reaching standard discharge after process.

Relative to existing method, the outstanding advantages of the present invention are to adopt CO₂Now widely used sulphuric acid is replaced to be acidified Agent, does not introduce SO₄ ^2-Ion, essentially eliminates generation H₂The material base of S（Contain a small amount of S in wastewater containing phenol and cyanide）, so as to subtract significantly Light H₂The pollution of S, while it also avoid SO₄ ^2-To hydrolysis acidification and it is aerobic during microorganism inhibitory action, greatly improve The efficiency of biological treatment；The producer of gas generator is had, subsequent combustion device, CO needed for the present invention is had mostly₂Can be from combustion It is isolated in the waste gas that burning is produced, processing cost can be not only reduced, and carbon emission can be reduced；Waste water energy after process is steady Determine qualified discharge, and be adapted to focusing on for the wastewater containing phenol and cyanide that remaining multiple stage gas generator is produced, investment reduction, with obvious Economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：It is daily to process 1m³The wastewater containing phenol and cyanide that gas generator is produced（pH8.1、COD_Cr8200mg/L, volatile phenol 940mg/L、CN^-4.1mg/L, T-N118mg/L）, reduce through manganese powder（Every liter of waste water adds manganese powder 5g, time 4h, 25 DEG C, CO₂ Pressure 0.1MPa）, hydrolysis acidification（24h、pH6.0）, aerobic biochemical（12h）With activated carbon biological filtering tower combined working（Hydraulic load is 40m³/ m².d, activated carbon gross thickness 2m）Process, effluent quality is COD_Cr80mg/L、CN^-0.15mg/L, volatile phenol 0.32mg/L, T- N16mg/L。

Embodiment 2：It is daily to process 20m³The wastewater containing phenol and cyanide that gas generator is produced（pH8.3、COD_Cr7900mg/L, volatilization Phenol 830mg/L, CN^-3.6mg/L, T-N105mg/L）, reduce through manganese powder（Every liter of waste water add manganese powder 10g, time 2h, 45 ℃、CO₂Pressure 0.3MPa）, hydrolysis acidification（8h、pH8.0）, aerobic biochemical（8h）With porous ceramic grain biological filtering tower combined working（Hydraulic load For 100m³/m².d, porous ceramic grain gross thickness 4m）Process, effluent quality is COD_Cr74mg/L、CN^-0.10mg/L, volatile phenol 0.23mg/L, T-N14mg/L.

Claims (1)

1. a kind of processing method of the wastewater containing phenol and cyanide that gas generator is produced, it is characterised in that the phenol that gas generator is produced Cyanogen waste water is filtered, the feeding voltage-resistant reactor after filtration, cleaning manganese powder is added reactor, and is passed through industrial CO₂Carry out Reaction, the granularity of manganese powder are less than 180 mesh, and every liter of waste water adds manganese powder 5g~10g, and the stirring reaction time is 2h~4h, and temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa, reacted waste water carries out solid-liquor separation, and the manganese powder isolated is returned Reactor is returned, the waste water lime cream or other alkaline matters after solid-liquor separation adjusts its pH value to 6~8, subsequently into precipitation 1h~3h is precipitated in pond, is irregularly extracted sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate is returned Sedimentation tank is returned, the supernatant of sedimentation tank send hydrolysis acidification pool, waste water room temperature in hydrolysis acidification pool to stop 8h~24h, hydrolysis acid Waste water after change is 8h~12h into the process of biology aerobic pond room temperature, Aerobic Process for Treatment time, and the waste water after Aerobic Process for Treatment enters heavy 1h~3h is precipitated in shallow lake pond, is irregularly extracted sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, filtrate Aerobic Pond is returned, the supernatant waste water of sedimentation tank send multi-layer biological filter tower to process, the filler of biological filtering tower combined working is that activated carbon or porous are made pottery Grain, filler gross thickness are 2m~6m, and the dominant bacteria of biological filtering tower combined working is the rhodopseudomonas in photosynthetic bacteria, the water of biological filtering tower combined working Power load is 30 m³/m².d~100m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.