CN106587517A - Deaminized landfill leachate treatment method - Google Patents

Abstract

The invention provides a deaminized landfill leachate treatment method. The treatment method comprises the processes of preneutralization by means of CO2, liquid-solid separation, iron-aluminum composite powder reduction through CO2 pressurization under an ultrasonic wave effect, anaerobic treatment, aerobiotic treatment, biologic filtering tower treatment and the like. Treated waste water can be stably discharged in an up-to-standard mode.

Description

The processing method of the percolate after deamination process

Technical field

The present invention relates to a kind of processing method of the percolate Jing after deamination process.

Background technology

Garbage loading embeading inevitably produces percolate.Pollutants from landfill leachate COD concentration is high, and composition is multiple Miscellaneous, intractability is big.If the waste water is not processed is directly discharged into environment, severe contamination will be caused to environment.Current percolate The main method combined using biological treatment and materializing strategy is processed.It is a considerable amount of due to containing in percolate Persistence organic pollutant（Containing phenyl ring and（Or）Heterocycle Organic substance）, thereby resulting in Biochemical method percolate can not be up to standard Discharge.Generally percolate first uses blow-off method deamination, then Jing biological treatments, eventually passes reverse osmosiss or advanced oxidation（Such as Fenton methods, catalytic oxidation etc.）Further processing could qualified discharge.Reverse-osmosis treated can produce concentrated water, this part concentrated water General recharge landfill waste, the salinity for thus causing percolate increases, reverse-osmosis treated is adversely affected, when serious Reverse osmosis treatment system is caused to be paralysed.Advanced oxidation processes processing cost is high.Development cost is low, the rubbish of energy stably reaching standard discharge oozes The processing method of filtrate has larger practical value.

The content of the invention

For the problem that current method for treating garbage percolation liquid is present, the purpose of the present invention is to find low cost, can stablize The processing method of the percolate of qualified discharge, it is characterised in that by the percolate CO Jing after deamination process₂（CO₂Can Being industrial CO₂, or fuel combustion, the CO that mineral decompose, sweat is produced₂）PH value is neutralized less than 7, liquid is carried out Gu separating, the waste water isolated enters regulating reservoir, and the solid isolated returns refuse landfill landfill.After adjusted pond is adjusted Waste water sends into voltage-resistant reactor, and cleaning ferrum aluminum composite powder is added into reactor, under ul-trasonic irradiation and is passed through industrial CO₂Carry out Reaction.The granularity of ferrum aluminum composite powder is less than 180 mesh, and the content of every kind of metal is not less than 5% in ferrum aluminum composite powder（What return was used Ferrum aluminum composite powder is not limited）.Every liter of waste water adds ferrum aluminum composite powder 10g～40g.The stirring reaction time be 20min～ 45min.Reaction temperature is 25 DEG C～60 DEG C, CO₂Pressure be 0.3MPa～1.0MPa.Every cubic metre of waste water is input into ultrasound wave Power is 2kW～8kW.Reacted waste water carries out solid-liquor separation, the ferrum aluminum composite powder Returning reactor isolated.Solid-liquor separation Waste water lime cream or other alkaline matters afterwards adjusts its pH value to 7.0～8.5, subsequently into anaerobic reactor.Waste water exists Anaerobic reactor stops 24h～120h, and anaerobism temperature is 25 DEG C～55 DEG C.Waste water after anaerobism enters biology aerobic Chi Changwenchu Reason, the Aerobic Process for Treatment time is 6h～16h.Waste water after Aerobic Process for Treatment enters sedimentation tank, and the sedimentation time is 1h～3h.Irregularly from Extract sludge in sedimentation tank out to be filtered, filter cake returns refuse landfill landfill, filtrate returns Aerobic Pond.The upper waste cleaning of sedimentation tank Water send multi-layer biological filter tower to process.The filler of biological filtering tower combined working is activated carbon or porous ceramic grain, is 0.5m～2.0m per thickness degree, always Thickness is 2m～4m.The dominant bacteria of biological filtering tower combined working is the rhodopseudomonas in photosynthetic bacteria（Rhodopseudomonas）.It is raw The hydraulic load of thing filter tower is 40 m³/m².d～100m³/m².d.The standard water discharge discharge of biological filtering tower combined working.

The object of the present invention is achieved like this, Jing deaminations process percolate solid matter it is more, basicity compared with Height, if using adding lime cream to carry out stripping deamination technique, the percolate contains more Ca²⁺, it and CO₂It is anti-in percolate CaCO should be generated₃.Before into ferrum aluminum composite powder reduction reactor, CO is used₂Preneutralization precipitation is carried out, and carries out solid-liquor separation, kept away Exempt from solid matter and generate CaCO₃Impact to the reduction of ferrum aluminum composite powder, is also beneficial to the complete ferrum aluminum composite powder of unreacted and reclaims Recycle.The waste water isolated is entered after ferrum aluminum composite powder reduction reactor, the larger molecular organicses in waste water, particularly persistently Property organic pollution（Containing phenyl ring and（Or）The Organic substance of heterocycle etc.）The strong reduction free radical for producing is reduced by ferrum aluminum composite powder Effect and destroy, be subsequent biochemical process create favorable conditions.It is passed through pressure CO₂Purpose be to maintain the reduction of ferrum aluminum composite powder Suitable pH value（2.0～5.0）, the effect for being input into ultrasound wave is to speed up the mass transport process of reduction reaction.Waste water after reduction is used Lime cream or other alkaline matters adjust its pH value, to meet the requirement of follow-up anaerobic and aerobic process.It is premenstrual to state the useless of process In anaerobic processes, by the effect of microorganism, larger molecular organicses further become small organic molecule to water, are subsequent bio More favorable condition is created in oxidation.By biological oxidation process, remaining most of Organic substances are removed, while going to denitrogenate the dirts such as phosphorus Dye thing.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly rhodopseudomonas, The further pollutant such as organics removal and nitrogen phosphorus, 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 reduced using ferrum aluminum composite powder, by percolate Persistence organic pollutant is destroyed, and is that subsequent biological treatment creates favorable conditions, so as to ensure the waste water stably reaching standard after processing Discharge；Relative to the metal deoxidization used in other wastewater treatments, using CO₂Now widely used sulphuric acid is replaced to make acid Agent, does not introduce SO₄ ^2-Ion, eliminates generation H₂The material base of S, so as to avoid H₂The pollution of S, while it also avoid SO₄ ^2-Inhibitory action to microorganism during anaerobic and aerobic, greatly improves the efficiency of biological treatment；Refuse landfill is filled Containing abundant CO in waste gas₂Waste gas is available for utilizing, and can not only reduce processing cost, and can reduce carbon emission；After process Waste water energy stably reaching standard is discharged, with obvious economic benefit and environmental benefit.

Specific implementation method

Embodiment 1：1m is processed daily³Deamination percolate（Composition：COD_Cr45000 mg/L、NH₃-N115 mg/L、T- P30mg/L）, Jing CO₂Preneutralization, solid-liquor separation, the reduction of ferrum aluminum composite powder（20min、40℃、CO₂Pressure 0.8MPa, every liter of waste water Ferrum aluminum composite powder 30g, every cubic metre of waste water is added to be input into the power 4kW of ultrasound wave）, anaerobism（PH8.5,96h, 25 DEG C～35 ℃）, it is aerobic（10h）And biological filtering tower combined working（Porous ceramic grain packing layer gross thickness 4m, hydraulic load 100m³/m².d）Water outlet after process COD_CrFor 61mg/L, NH₃-N 6.3mg/L、T-P0.2mg/L。

Embodiment 2：5m is processed daily³Deamination percolate（Composition: COD_Cr18000 mg/L、NH₃-N43 mg/L、 T-P13mg/L）, Jing CO₂Preneutralization, solid-liquor separation, the reduction of ferrum aluminum composite powder（35min、25℃、CO₂Pressure 0.3MPa, per liter give up Water adds ferrum aluminum composite powder 10g, every cubic metre of waste water to be input into the power 2kW of ultrasound wave）, anaerobism（PH7.0,24h, 35 DEG C～55 ℃）, it is aerobic（6h）And biological filtering tower combined working（Active carbon filler layer gross thickness 2m, hydraulic load 50m³/m².d）Water outlet after process COD_CrFor 53mg/L, NH₃-N 5.4mg/L、T-P0.2mg/L。

Claims (1)

1. it is a kind of Jing deamination process after percolate processing method, it is characterised in that by Jing deamination process after rubbish Percolate CO₂PH value is neutralized less than 7, solid-liquor separation is carried out, the waste water isolated enters regulating reservoir, and the solid isolated is returned Refuse landfill landfill is returned, the waste water after adjusted pond is adjusted sends into voltage-resistant reactor, and cleaning ferrum aluminum composite powder is added into reaction Device, under ul-trasonic irradiation and is passed through industrial CO₂Reacted, the granularity of ferrum aluminum composite powder is less than 180 mesh, in ferrum aluminum composite powder The content of every kind of metal is not less than 5%, and every liter of waste water adds ferrum aluminum composite powder 10g～40g, the stirring reaction time be 20min～ 45min, reaction temperature is 25 DEG C～60 DEG C, CO₂Pressure be 0.3MPa～1.0MPa, every cubic metre of waste water input ultrasound wave Power is 2kW～8kW, and reacted waste water carries out solid-liquor separation, the ferrum aluminum composite powder Returning reactor isolated, solid-liquor separation Waste water lime cream or other alkaline matters afterwards adjusts its pH value to 7.0～8.5, and subsequently into anaerobic reactor, waste water exists Anaerobic reactor stops 24h～120h, and anaerobism temperature is 25 DEG C～55 DEG C, and the waste water after anaerobism enters biology aerobic Chi Changwenchu Reason, the Aerobic Process for Treatment time is 6h～16h, and the waste water after Aerobic Process for Treatment enters sedimentation tank, and the sedimentation time is 1h～3h, irregularly from Extract sludge in sedimentation tank out to be filtered, filter cake returns refuse landfill landfill, filtrate returns Aerobic Pond, the upper waste cleaning of sedimentation tank Water 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～4m, biological The dominant bacteria of filter tower is the rhodopseudomonas in photosynthetic bacteria, and the hydraulic load of biological filtering tower combined working is 40 m³/m².d～100m³/ m².d, the standard water discharge discharge of biological filtering tower combined working.