CN106630440A - TNT (trinitrotoluene) production wastewater treatment method - Google Patents

Abstract

The invention relates to a TNT (trinitrotoluene) production wastewater treatment method which includes the processes of acid wastewater and alkali wastewater mixing, solid-liquid separation, CO2 pressurized iron-aluminum composite powder reduction under the action of ultrasonic waves, anaerobic, aerobiotic and biological filtration tower treatment and the like. Treated wastewater can be stably discharged to reach standards.

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 is acid waste water, and another kind is alkaline waste water.At present the processing method of acid waste water is mainly at biology Reason.It is very big to the toxicity of microorganism due to containing nitrobenzene compounds in waste water, affect biological treatment effect, waste water to be difficult to Stably reaching standard is discharged.At present the processing method of alkaline waste water is mainly burning method, 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 basin, and sedimentation basin has regulatory function concurrently.Sedimentation time is 1h～3h.Irregularly from sedimentation basin Middle extraction sludge is filtered.Filter cake makees dangerous disposition of solid waste.Filtrate returns sedimentation basin.The supernatant waste water of sedimentation basin send Enter voltage-resistant reactor, cleaning iron aluminium composite powder is added into reactor, under ul-trasonic irradiation and be passed through industrial CO₂Reacted. The granularity of iron aluminium composite powder is less than 180 mesh, and the content of every kind of metal is not less than 5% in iron aluminium composite powder（The iron aluminium that return is used is answered Close powder not limited）, every liter of waste water addition iron aluminium composite powder 15g～40g.The stirring reaction time is under ul-trasonic irradiation 20min～50min.Reaction temperature is 25 DEG C～60 DEG C.CO₂Pressure be 0.3MPa～1.0MPa.Every cubic metre of waste water input The power of ultrasonic wave is 2kW～8kW.Reacted waste water carries out solid-liquor separation, the iron aluminium composite powder Returning reactor isolated. Waste water milk of lime or other alkaline matters after solid-liquor separation adjusts its pH value to 7.0～8.5, 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 precipitation Pond.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 DEG C.Into the process of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 6h～16h to waste water after anaerobism.After Aerobic Process for Treatment Waste 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 Thing is disposed, and filtrate returns Aerobic Pond.The supernatant waste water in biology aerobic pond send multi-layer biological filter tower to process.The filler of biological filtering tower combined working is Activated carbon or porous ceramic grain, are 1.0m～2.0m per thickness degree, and gross thickness is 2m～6m.The dominant bacteria of biological filtering tower combined working is photosynthetic Red pseudomonas in bacterium（Rhodopseudomonas）.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.

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 sediment produced in order to avoid acid precipitation reaction and the solid matter contained in itself in waste water are compound to iron aluminium Powder reduction has a negative impact, and is also beneficial to unreacted iron aluminium composite powder and recycles, therefore carries out separation of solid and liquid to it.It is useless Water is entered after iron aluminium composite powder reduction reactor, and the larger molecular organicses in waste water, particularly nitrobenzene matters pass through iron aluminium Composite powder reduces the effect of the strong reduction free radical for producing and destroys, and substantially reduces toxicity of the waste water to microorganism, is follow-up life Change is processed and created favorable conditions.It is passed through pressure CO₂Purpose be to maintain iron aluminium composite powder to reduce suitable pH value（2.0～5.0）； The effect of input ultrasonic wave is the mass transport process of Accelerating reduction reaction.Waste water milk of lime or other alkaline matters after reduction is adjusted Its pH value is saved, to meet the requirement of follow-up anaerobic and aerobic process.The premenstrual waste water for stating process in anaerobic processes, by micro- life The effect of thing, larger molecular organicses further become small organic molecule, are that more favorable condition is created in subsequent bio oxidation.Pass through Biological oxidation process, remaining most of organic matters are removed, while the pollutant such as removing to denitrogenate.Waste water finally enter activated carbon or Porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly red pseudomonas, the pollution such as further organics removal and nitrogen Thing, it is ensured that the waste water stably reaching standard discharge after process.

Relative to existing method, the present invention is greatly reduced useless using iron aluminium composite powder reduction destruction nitrobenzene matters Toxicity of the water to microorganism, and greatly improve the biodegradability energy of waste water；Relative to now widely used destruction nitrobenzene The method of material（Iron-carbon micro-electrolysis, metal powder reduction, Fenton methods etc.）, the outstanding advantages of the present invention are to adopt CO₂Replace mesh Front widely used sulfuric acid makees acidulant, does not introduce SO₄ ^2-Ion, largely reducing generation H₂The material base of S（TNT productions are useless Water contains S）, so as to significantly reduce H₂The pollution of S, while also mitigating SO₄ ^2-Suppression to microorganism during anaerobic and aerobic Effect, greatly improves the efficiency of biological treatment, it is ensured that the waste water energy stably reaching standard discharge after process；Pot is all had in TNT factories Stove, 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, have Obvious 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 separation of solid and liquid, the reduction of iron aluminium composite powder（20min、40℃、CO₂Pressure 0.6MPa, every liter of waste water add iron aluminium Composite powder 30g, the power of every cubic metre of waste water input ultrasonic wave are 4kW）, 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 67mg/L, nitrobenzene 1.0mg/L, BOD₅13mg/L, pH6.9, colourity 16.

Embodiment 2：5m is processed daily³Mixture manufacturing waste water（Composition： COD_Cr7100mg/L, nitrobenzene matters 835mg/L、pH6.3）, the reduction of Jing iron aluminium composite powder（40min、25℃、CO₂Pressure 0.3MPa, every liter of waste water add iron aluminium to be combined Powder 15g, the power of every cubic metre of waste water input ultrasonic wave are 2kW）, 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 70mg/L, nitre Base benzene class 1.1mg/L, BOD₅15mg/L, pH7.0, colourity 18.

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 basin, and sedimentation basin has regulatory function concurrently, and the sedimentation time is 1h～3h, irregularly from Extract sludge in sedimentation basin out to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation basin, the supernatant of sedimentation basin Waste water sends into voltage-resistant reactor, and cleaning iron aluminium composite powder is added into reactor, under ul-trasonic irradiation and is passed through industrial CO₂Carry out Reaction, the granularity of iron aluminium composite powder is less than 180 mesh, and the content of every kind of metal is not less than 5% in iron aluminium composite powder, and every liter of waste water adds Enter iron aluminium composite powder 15g～40g, the stirring reaction time is 20min～50min under ul-trasonic irradiation, and reaction temperature is 25 DEG C ～60 DEG C, CO₂Pressure be 0.3MPa～1.0MPa, the power of every cubic metre of waste water input ultrasonic wave is 2kW～8kW, reaction Waste water afterwards carries out solid-liquor separation, the iron aluminium composite powder Returning reactor isolated, waste water milk of lime after solid-liquor separation or Other alkaline matters adjust its pH value to 7.0～8.5, and subsequently into sedimentation basin 1h～3h is precipitated, and irregularly take out from sedimentation basin Go out sludge to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns sedimentation basin, and the supernatant waste water of sedimentation basin send anaerobism Reactor, 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 life Thing Aerobic Pond normal temperature process, the Aerobic Process for Treatment time is 6h～16h, and the waste water after Aerobic Process for Treatment enters sedimentation basin and precipitates 1h～3h, Irregularly extract sludge out from sedimentation basin to be filtered, filter cake makees dangerous disposition of solid waste, filtrate returns Aerobic Pond, precipitation The supernatant waste water in 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, and filler gross thickness is 2m～6m, the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, and the hydraulic load of biological filtering tower combined working is 30 m³/ m².d～90m³/m².d, the standard water discharge discharge or reuse of biological filtering tower combined working.