CN106673325A - Treatment method for phenol and cyanide wastewater generated by gas producer - Google Patents

Abstract

The invention discloses a treatment method for phenol and cyanide wastewater generated by a gas producer. The method comprises the procedures of filtration, CO2 pressurization, aluminum-zinc composite powder reduction, precipitation, hydrolytic acidification, aerobic treatment and biofilter treatment. The treated wastewater can be stably discharged up to the standard.

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.At present the processing method of wastewater containing phenol and cyanide mainly has biochemistry 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 A large amount of evaporations, thus make considerable part phenol and cyanogen have neither part nor lot in chemical reaction and enter 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 occur coal gas The wastewater containing phenol and cyanide that stove is produced is filtered, the feeding voltage-resistant reactor after filtration, and cleaning aluminum zinc composite powder is added into reactor, and It is passed through industrial CO₂Reacted, the granularity of aluminum zinc composite powder is less than 180 mesh, the content of each metal in aluminum zinc composite powder It is not less than 5%（The aluminum zinc composite powder that return is used is not limited）, every liter of waste water addition aluminum zinc composite powder 5g~10g, stirring is instead It is 2h~4h between seasonable, temperature is 25 DEG C~60 DEG C, CO₂Pressure be 0.1MPa~1.0MPa.Reacted waste water carries out liquid Gu separate, the aluminum zinc composite powder Returning reactor isolated.Waste water lime cream or other alkaline matters after solid-liquor separation is adjusted Its pH value is saved to 6~8, subsequently into sedimentation tank 1h~3h is precipitated, irregularly extracted sludge out from sedimentation tank and filtered, filter cake Make dangerous disposition of solid waste, filtrate returns sedimentation tank.The supernatant of sedimentation tank send hydrolysis acidification pool.Waste water is in hydrolysis acidification Room temperature stops 8h~24h in pond.Waste water after hydrolysis acidification into biology aerobic pond room temperature process, the Aerobic Process for Treatment time be 8h~ 12h.Waste water after Aerobic Process for Treatment enters sedimentation tank and precipitates 1h~3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filters Cake makees dangerous disposition of solid waste, and filtrate returns Aerobic Pond.The supernatant waste water of sedimentation tank send multi-layer biological filter tower to process.It is biological The filler of filter tower is activated carbon or porous ceramic grain, is 1m~2m per thickness degree, and gross thickness is 2m~6m.The dominant bacteria of biological filtering tower combined working Plant as the rhodopseudomonas in photosynthetic bacteria（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d~ 100m³/m².d.The standard water discharge discharge of biological filtering tower combined working or reuse.

The object of the present invention is achieved like this：Waste water enters the zinc of resistance to jewelling composite powder reduction reactor, big in waste water Molecular organic, particularly persistence organic pollutant（Organic substance containing phenyl ring, heterocycle）Produced by the reduction of aluminum zinc composite powder Strong reduction free radical effect and destroy, be subsequent biochemical process create favorable conditions.It is passed through pressure CO₂Purpose be maintain Aluminum zinc composite powder reduces suitable pH value（2.0~5.0）, the waste water lime cream or other alkaline matters after reduction adjust it PH, to meet sequential hydrolysis acidifying and the requirement of aerobic process.The premenstrual waste water for stating process in Hydrolysis Acidification, by micro- Biological effect, larger molecular organicses further become small organic molecule, are that more favorable condition is created in subsequent bio oxidation.It is logical Biological oxidation process is crossed, remaining most of Organic substances are removed.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, In the presence of microorganism, particularly rhodopseudomonas, further organics removal, it is ensured that the waste water stably reaching standard row after process Put.

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 are had mostly₂Can be from combustion Burn isolated in the waste gas for producing, can not only reduce processing cost, 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（pH8.2、COD_Cr8500mg/L, volatile phenol 910mg/L、CN^-4.2mg/L, T-N115mg/L）, through the reduction of aluminum zinc composite powder（Every liter of waste water add aluminum zinc composite powder 5g, when Between 4h, 25 DEG C, CO₂Pressure 0.1MPa）, hydrolysis acidification（24h、pH6.0）, aerobic biochemical（12h）With activated carbon biological filtering tower combined working（Water Power load is 40m³/m².d, activated carbon gross thickness 2m）Process, effluent quality is COD_Cr82mg/L、CN^-0.18mg/L, volatile phenol 0.37mg/L、T-N18mg/L。

Embodiment 2：It is daily to process 20m³The wastewater containing phenol and cyanide that gas generator is produced（pH8.3、COD_Cr8000mg/L, volatilization Phenol 860mg/L, CN^-3.9mg/L, T-N101mg/L）, through the reduction of aluminum zinc composite powder（Every liter of waste water adds aluminum zinc composite powder 10g, time 2h, 45 DEG C, CO₂Pressure 0.3MPa）, hydrolysis acidification（8h、pH8.0）, aerobic biochemical（8h）It is biological with porous ceramic grain Filter tower（Hydraulic load is 100m³/m².d, porous ceramic grain gross thickness 4m）Process, effluent quality is COD_Cr70mg/L、CN^- 0.10mg/L, volatile phenol 0.27mg/L, T-N16mg/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 for producing gas generator Cyanogen waste water is filtered, the feeding voltage-resistant reactor after filtration, and cleaning aluminum zinc composite powder is added into reactor, and is passed through industry CO₂Reacted, the granularity of aluminum zinc composite powder is less than 180 mesh, and the content of each metal in aluminum zinc composite powder is not less than 5%, Every liter of waste water adds aluminum zinc composite powder 5g~10g, and the stirring reaction time is 2h~4h, and temperature is 25 DEG C~60 DEG C, CO₂Pressure Power is 0.1MPa~1.0MPa, and reacted waste water carries out solid-liquor separation, and the aluminum zinc composite powder Returning reactor isolated, liquid is solid Waste water lime cream or other alkaline matters after separation adjusts its pH value to 6~8, and subsequently into sedimentation tank 1h~3h is precipitated, 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 in pond send hydrolysis acidification pool, waste water room temperature in hydrolysis acidification pool to stop 8h~24h, and the waste water after hydrolysis acidification is entered Biology aerobic pond room temperature is processed, and the Aerobic Process for Treatment time is 8h~12h, the waste water after Aerobic Process for Treatment enter sedimentation tank precipitation 1h~ 3h, irregularly extracts sludge out from sedimentation tank and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns Aerobic Pond, The supernatant waste water in biology aerobic pond send multi-layer biological filter tower to process, and the filler of biological filtering tower combined working is activated carbon or porous ceramic grain, filler Gross thickness is 2m~6m, and the dominant bacteria of biological filtering tower combined working is the rhodopseudomonas in photosynthetic bacteria, the hydraulic load of biological filtering tower combined working For 30 m³/m².d~100m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.