CN106673319A - 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 iron 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

A kind of processing method of the waste water produced the present invention relates to TNT productions.

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.The processing method of current acid waste water is mainly biological place Reason.Due to containing nitrobenzene compounds in waste water, the toxicity to microorganism is very big, influences biological treatment effect, and waste water is difficult to Stably reaching standard is discharged.The processing method of current 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, severe contamination atmospheric environment.Exploitation secondary pollution is small, 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 small, can stablize The TNT of qualified discharge produces the processing method of waste water, it is characterised in that the acid waste water and alkaline waste water for producing TNT productions are mixed 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 to sedimentation basin.The supernatant waste water of sedimentation basin send Enter voltage-resistant reactor, cleaning iron powder is added into reactor, and be passed through industrial CO₂Reacted, the granularity of iron powder is less than 180 mesh, Every liter of waste water adds iron powder 15g~40g, and the stirring reaction time is 2h~4h, and reaction temperature is 25 DEG C~60 DEG C, CO₂Pressure It is 0.3MPa~1.0MPa.Reacted waste water carries out solid-liquor separation, the iron powder Returning reactor isolated.After solid-liquor separation Waste water milk of lime or other alkaline matters adjust its pH value to 7.0~8.5, and 1h~3h is precipitated subsequently into sedimentation basin, indefinite Phase extracts sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate returns to sedimentation basin.Sedimentation basin Supernatant waste water send anaerobic reactor.Waste water stops 24h~120h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C.Anaerobism Into the treatment of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 6h~16h to waste water afterwards.Waste water after Aerobic Process for Treatment enters precipitation 1h~3h is precipitated in pond, is irregularly extracted sludge out from sedimentation basin and is filtered, and filter cake makees dangerous disposition of solid waste, and filtrate is returned Return 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 be 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 the red false unit cell in photosynthetic bacteria Bacterium（Rhodopseudomonas）.The hydraulic load of biological filtering tower combined working is 30 m³/m².d~90m³/m².d.The water outlet of biological filtering tower combined working 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 mix, waste water meeting Generation acid precipitation reaction.The solid matter contained in itself in the sediment and waste water that are produced in order to avoid acid precipitation reaction is to iron powder reducing Have a negative impact, be also beneficial to unreacted iron powder and recycle, therefore separation of solid and liquid is carried out to it.Waste water enters iron powder also After former reactor, the strong reduction that the larger molecular organicses in waste water, particularly nitrobenzene matters are produced by iron powder reducing from Destroyed by the effect of base, substantially reduce toxicity of the waste water to microorganism, be that subsequent biochemical treatment creates favorable conditions.It is passed through pressure Power CO₂Purpose be maintain the suitable pH value of iron powder reducing（2.0~5.0）, waste water milk of lime or other alkalescence after reduction Material adjusts its pH value, to meet the requirement of follow-up anaerobic and aerobic process.Through the waste water of aforementioned processing in anaerobic processes, lead to 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.Processed by biological oxidation, remaining most of organic matters 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 red pseudomonas, further organics removal and The pollutants such as nitrogen, it is ensured that the waste water stably reaching standard discharge after treatment.

Relative to existing method, the present invention destroys nitrobenzene matters, greatly reduces waste water to micro- using iron powder reducing 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.）, outstanding advantages of the invention are to use CO₂Instead of extensive at present The sulfuric 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 treatment；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）, through separation of solid and liquid, iron powder reducing（2h、40℃、CO₂Pressure 0.6MPa, every liter of waste water add iron 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 treatment_CrIt is 78mg/L, nitrobenzene 1.3mg/L, BOD₅12mg/L, pH6.8, colourity 23.

Embodiment 2：5m is processed daily³Mixture manufacturing waste water（Composition： COD_Cr7100mg/L, nitrobenzene matters 835mg/L、pH6.3）, through iron powder reducing（4h、25℃、CO₂Pressure 0.3MPa, every liter of waste water add iron 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 treatment_CrIt is 82mg/L, nitrobenzene 1.5mg/L, BOD₅14mg/L, pH6.9, colourity 25.

Claims (1)

1. a kind of TNT produces the processing method of the waste water for producing, it is characterised in that the acid waste water and alkalescence for producing TNT productions 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 to sedimentation basin, the supernatant of sedimentation basin Waste water sends into voltage-resistant reactor, cleaning iron powder is added into reactor, and be passed through industrial CO₂Reacted, the granularity of iron powder is less than 180 mesh, every liter of waste water adds iron 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 iron powder Returning reactor isolated, liquid divides admittedly Waste water milk of lime or other alkaline matters after adjust 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 to sedimentation basin, The supernatant waste water of sedimentation basin send anaerobic reactor, waste water to stop 24h~120h in anaerobic reactor, and anaerobism temperature is 25 DEG C~55 DEG C, into the treatment of biology aerobic pond normal temperature, the Aerobic Process for Treatment time is 6h~16h, the waste water after Aerobic Process for Treatment to the waste water after anaerobism 1h~3h is precipitated into sedimentation basin, irregularly sludge is extracted out from sedimentation basin and is filtered, filter cake is made at dangerous solid waste Put, filtrate returns to 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 for activated carbon or Porous ceramic grain, filler gross thickness is 2m~6m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas 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.