CN106673340A - Treatment method for TNT (trinitrotoluene) production wastewater - Google Patents

Abstract

The invention relates to a treatment method for TNT (trinitrotoluene) production wastewater. The treatment method comprises the following steps of mixing of acid wastewater and alkaline wastewater, solid and liquid separation, CO2 (carbon dioxide) pressurizing and reduction by manganese powder, anaerobic treatment, aerobic treatment, biological filter tower treatment, and the like. The treated wastewater can stably reach standard, and can be drained.

Description

TNT produces the processing method of waste water

Technical field

The present invention relates to a kind of processing method of the waste water of TNT production generations.

Background technology

TNT is a kind of explosive, is dual-use product.The organic waste water pollutant COD concentration that its production is produced is high, into Divide complexity, intractability is big.If the waste water is not processed is directly discharged into environment, severe contamination will be caused to environment.TNT productions are produced Two kinds of waste water, one kind are acid waste water, and another kind is alkaline waste water.The processing method of acid waste water is mainly at biology at present Reason.It is due to containing nitrobenzene compounds in waste water, very big to the toxicity of microorganism, affect biological treatment effect, waste water to be difficult to Stably reaching standard is discharged.The processing method of alkaline waste water is mainly burning method at present, due to containing a large amount of nitrobenzenes in waste water Compound, produces a large amount of NO during burning_x, major polluting atmosphere environment.Exploitation secondary pollution is little, the TNT lifes of energy stably reaching standard discharge The processing method for producing waste water has larger practical value.

The content of the invention

For the problem of current TNT production wastewater treatments method, the purpose of the present invention is that searching secondary pollution is little, can stablize The TNT of qualified discharge produces the processing method of waste water, it is characterised in that mix acid waste water and alkaline waste water that TNT produces generation Close, mixed waste water enters sedimentation tank, and sedimentation tank has regulatory function concurrently.Sedimentation time is 1h~3h.Irregularly from sedimentation tank Middle extraction sludge is filtered.Filter cake makees dangerous disposition of solid waste.Filtrate returns sedimentation tank.The supernatant waste water of sedimentation tank send Enter voltage-resistant reactor, cleaning manganese powder is added into reactor, and is passed through industrial CO₂Normal-temperature reaction is carried out, the granularity of manganese powder is less than 180 Mesh, every liter of waste water add manganese powder 15g~40g, and the stirring reaction time is 2h~4h, and reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure Power is 0.3MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, the manganese powder Returning reactor isolated.After solid-liquor separation Waste water lime cream or other alkaline matters adjust its pH value to 7.0~8.5, precipitate 1h~3h subsequently into sedimentation tank, no Periodically extract sludge out from sedimentation tank to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation tank.Sedimentation tank Supernatant waste water send anaerobic reactor.Waste water stops 24h~120h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C.Detest Into the process of biology aerobic pond room temperature, the Aerobic Process for Treatment time is 6h~16h to waste water after oxygen.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 Return 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 that activated carbon or porous are made pottery Grain, is 1.0m~2.0m per thickness degree, and gross thickness is 2m~6m.The dominant bacteria of biological filtering tower combined working is the red false list in photosynthetic bacteria Born of the same parents bacterium（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d~90m³/m².d.Biological filtering tower combined working goes out Water qualified discharge or reuse.

The object of the present invention is achieved like this, after the acid waste water and alkaline waste water that TNT productions are produced mixes, waste water meeting Generation acid precipitation reaction.The precipitate produced in order to avoid acid precipitation reaction and the solid matter for containing in waste water in itself are reduced to manganese powder Have a negative impact, be also beneficial to unreacted manganese powder and recycle, therefore solid-liquid separation is carried out to which.Waste water enters manganese powder also After former reactor, the larger molecular organicses in waste water, particularly nitrobenzene matters reduce the strong reduction for producing certainly by manganese powder Destroyed by the effect of base, substantially reduce toxicity of the waste water to microorganism, be that subsequent biochemical process creates favorable conditions.It is passed through pressure Power CO₂Purpose be to maintain manganese powder to reduce suitable pH value（2.0~5.0）, the waste water lime cream or other alkalescence after reduction Material adjusts its pH value, to meet the requirement of follow-up anaerobic and aerobic process.The premenstrual waste water for stating process leads in anaerobic processes The effect of microorganism is crossed, larger molecular organicses further become small organic molecule, be that more favourable bar is created in subsequent bio oxidation Part.By biological oxidation process, remaining most of Organic substances are removed, while the pollutant such as removing to denitrogenate.Waste water is finally entered Activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly rhodopseudomonas, further organics removal and The pollutant such as nitrogen, it is ensured that the waste water stably reaching standard discharge after process.

Relative to existing method, the present invention greatly reduces waste water to micro- using manganese powder reduction destruction nitrobenzene matters Biological toxicity, and greatly improve the biodegradability energy of waste water；Relative to now widely used destruction nitrobenzene matters Method（Iron-carbon micro-electrolysis, metal powder reduction, Fenton methods etc.）, the outstanding advantages of the present invention are to adopt CO₂Replace at present extensively The sulphuric acid for using makees acidulant, does not introduce SO₄ ^2-Ion, largely reducing generation H₂The material base of S（TNT production waste water contains S）, so as to significantly reduce H₂The pollution of S, while also mitigating SO₄ ^2-Suppression to microorganism during anaerobic and aerobic is made With greatly improving the efficiency of biological treatment, it is ensured that the waste water energy stably reaching standard discharge after process；Boiler is all had in TNT factories, The CO that fuel combustion is produced₂Waste gas can make full use of, and can not only reduce processing cost, and can reduce carbon emission, with bright Aobvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：1m is processed daily³TNT mixture manufacturing waste water（Composition： COD_Cr7100mg/L, nitrobenzene matters 835mg/ L、pH6.3）, Jing solid-liquid separation, manganese powder reduction（2h、40℃、CO₂Pressure 0.6MPa, every liter of waste water add manganese powder 30g）, anaerobism （PH8.5,96h, 25 DEG C~35 DEG C）, it is aerobic（12h）And biological filtering tower combined working（Porous ceramic grain packing layer gross thickness 4m, hydraulic load 90m³/m².d）The COD of water outlet after process_CrFor 88mg/L, nitrobenzene 1.9mg/L, BOD₅17mg/L, pH6.7, colourity 25.

Embodiment 2：5m is processed daily³Mixture manufacturing waste water（Composition： COD_Cr7100mg/L, nitrobenzene matters 835mg/L、pH6.3）, the reduction of Jing manganese powders（4h、25℃、CO₂Pressure 0.3MPa, every liter of waste water add manganese powder 15g）, anaerobism （PH7.0,24h, 35 DEG C~55 DEG C）, it is aerobic（6h）And biological filtering tower combined working（Active carbon filler layer gross thickness 2m, hydraulic load 40m³/ m².d）The COD of water outlet after process_CrFor 93mg/L, nitrobenzene 2.2mg/L, BOD₅20mg/L, pH6.8, colourity 29.

Claims (1)

1. a kind of TNT produces the processing method of the waste water for producing, it is characterised in that TNT is produced the acid waste water and alkalescence for producing Waste water mixes, and mixed waste water enters sedimentation tank, and sedimentation tank has regulatory function concurrently, and the sedimentation time is 1h~3h, irregularly from Extract sludge out to be filtered in sedimentation tank, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation tank, the supernatant of sedimentation tank Waste water sends into voltage-resistant reactor, cleaning manganese powder is added reactor, and is passed through industrial CO₂Reacted, the granularity of manganese powder is less than 180 mesh, every liter of waste water add manganese powder 15g~40g, and the stirring reaction time is 2h~4h, and reaction temperature is 25 DEG C~60 DEG C, CO₂ Pressure be 0.3MPa~1.0MPa, reacted waste water carries out solid-liquor separation, and the manganese powder Returning reactor isolated, liquid divide admittedly Waste water lime cream or other alkaline matters after adjusts its pH value to 7.0~8.5, subsequently into sedimentation tank precipitation 1h~ 3h, irregularly from sedimentation tank extracts sludge out and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns sedimentation tank, The supernatant waste water of sedimentation tank send anaerobic reactor, waste water to stop 24h~120h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C, the waste water after anaerobism into biology aerobic pond room temperature process, the Aerobic Process for Treatment time be 6h~16h, the 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, filler gross thickness are 2m~6m, and the dominant bacteria of biological filtering tower combined working is the rhodopseudomonas in photosynthetic bacteria, biological filter The hydraulic load of tower is 30 m³/m².d~90m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.