CN106698841A - Treatment method of deaminized landfill leachate - Google Patents

Abstract

The invention provides a treatment method of deaminized landfill leachate. The treatment method comprises the following processes: preneutralization with CO2, liquid-solid separation, pressurization of manganese powder for reduction with CO2, anaerobic reaction, aerobic reaction, treatment with a biological filtration tower and the like. Waste water after treatment can achieve stable up-to-standard discharge.

Description

The processing method of the percolate after deamination treatment

Technical field

The present invention relates to a kind of processing method of the percolate after being processed through deamination.

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 being 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 matter）, thereby resulting in Biochemical method percolate can not be up to standard Discharge.Usual percolate first uses blow-off method deamination, then through biological treatment, eventually passes counter-infiltration or advanced oxidation（Such as Fenton methods, catalytic oxidation etc.）Further treatment could qualified discharge.Reverse-osmosis treated can produce concentrated water, this part concentrated water General recharge landfill waste, thus causes the salinity of percolate to increase, and 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 the percolate CO after being processed through deamination₂（CO₂Can Being industrial CO₂, or fuel combustion, the CO that mineral are decomposed, fermentation process 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 to refuse landfill landfill.After adjusted pond regulation Waste water sends into voltage-resistant reactor, cleaning manganese powder is added into reactor, and be passed through industrial CO₂Reacted, the granularity of manganese powder is less than 180 mesh, every liter of waste water adds manganese powder 10g~40g, and the stirring reaction time is 1h~3h, 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, the manganese 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 anaerobic reactor.Waste water 24h~120h is stopped in anaerobic reactor, anaerobism temperature is 25 DEG C~55 DEG C.Waste water after anaerobism enters biology aerobic pond normal temperature Treatment, the Aerobic Process for Treatment time is 6h~16h.Waste water after Aerobic Process for Treatment enters sedimentation basin, and the sedimentation time is 1h~3h.Irregularly Extract sludge out from sedimentation basin to be filtered, filter cake returns to refuse landfill landfill, filtrate returns to Aerobic Pond.The supernatant of sedimentation basin Waste 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, Gross thickness is 2m~4m.The dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria（Rhodopseudomonas）. 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.

The object of the present invention is achieved like this, through deamination process percolate solid matter it is more, basicity compared with Height, if using plus milk of lime carry out stripping deamination technique, the percolate contains more Ca²⁺, it and CO₂It is anti-in percolate CaCO should be generated₃.Before manganese powder reduction reactor is entered, CO is used₂Preneutralization precipitation is carried out, and carries out solid-liquor separation, it is to avoid solid-state Material and generation CaCO₃Influence to manganese powder reduction, is also beneficial to the complete manganese powder recycling of unreacted.The waste water isolated Into after manganese powder reduction reactor, the larger molecular organicses in waste water, particularly persistence organic pollutant（Containing phenyl ring and（Or） The organic matter of heterocycle etc.）The effect of the strong reduction free radical for producing is reduced by manganese powder and is destroyed, be that subsequent biochemical treatment is created Advantage.It is passed through pressure CO₂Purpose be to maintain manganese powder to reduce suitable pH value（2.0~5.0）, the waste water stone after reduction Grey breast or other alkaline matters adjust its pH value, to meet the requirement of follow-up anaerobic and aerobic process.Through the waste water of aforementioned processing In anaerobic processes, by the effect of microorganism, larger molecular organicses further become small organic molecule, are subsequent bio oxygen Change and create more favorable condition.Processed by biological oxidation, remaining most of organic matters are removed, while going to denitrogenate the pollution such as phosphorus Thing.Waste water finally enters activated carbon or porous ceramic grain biological filtering tower combined working, in the presence of microorganism, particularly red pseudomonas, enters The pollutant such as one step organics removal and nitrogen phosphorus, it is ensured that the waste water stably reaching standard discharge after treatment.

Relative to existing method, outstanding advantages of the invention are reduced using manganese powder, by the persistence in percolate Organic pollution is destroyed, and is that subsequent biological treatment creates favorable conditions, so as to ensure the waste water stably reaching standard discharge after treatment；Phase For the metal deoxidization used in other wastewater treatments, using CO₂Make acidulant instead of now widely used sulfuric acid, no 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-To detesting Oxygen and it is aerobic during microorganism inhibitory action, greatly improve the efficiency of biological treatment；Contain in refuse landfill landfill waste gas There is abundant CO₂Waste gas is available for utilizing, and can not only reduce processing cost, and can reduce carbon emission；Waste water energy after treatment is steady Qualified discharge is determined, 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）, through CO₂Preneutralization, solid-liquor separation, manganese powder reduction（1h、40℃、CO₂Pressure 0.8MPa, every liter of waste water add manganese powder 30g）, anaerobism（PH8.5,96h, 25 DEG C~35 DEG C）, it is aerobic（10h）And biological filtering tower combined working（Porous ceramic grain packing layer gross thickness 4m, water Power load 100m³/m².d）The COD of water outlet after treatment_CrIt is 87mg/L, NH₃-N 7.8mg/L、T-P0.4mg/L。

Embodiment 2：5m is processed daily³Deamination percolate（Composition: COD_Cr18000 mg/L、NH₃-N43 mg/L、 T-P13mg/L）, through CO₂Preneutralization, solid-liquor separation, manganese powder reduction（2h、25℃、CO₂Pressure 0.3MPa, every liter of waste water add manganese Powder 10g）, 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, water Power load 50m³/m².d）The COD of water outlet after treatment_CrIt is 59mg/L, NH₃-N 4.9mg/L、T-P0.4mg/L。

Claims (1)

1. it is a kind of through deamination process after percolate processing method, it is characterised in that the rubbish after being processed through deamination 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, cleaning manganese powder is added reactor, and lead to by the waste water feeding voltage-resistant reactor after adjusted pond regulation Enter industrial CO₂Reacted, the granularity of manganese powder is less than 180 mesh, every liter of waste water adds manganese powder 10g~40g, the stirring reaction time is 1h~3h, reaction temperature be 25 DEG C~60 DEG C, CO₂Pressure be 0.3MPa~1.0MPa, reacted waste water carries out liquid and divides admittedly From the manganese powder Returning reactor isolated, waste water milk of lime or other alkaline matters after solid-liquor separation adjust its pH value and arrives 7.0~8.5, subsequently into anaerobic reactor, waste water stops 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 Into sedimentation basin, the sedimentation time is 1h~3h, irregularly extracts sludge out from sedimentation basin and is filtered, and filter cake returns to garbage loading embeading Field landfill, filtrate returns to Aerobic Pond, and the supernatant waste water of sedimentation basin send multi-layer biological filter tower to process, and the filler of biological filtering tower combined working is active Charcoal or porous ceramic grain, filler gross thickness are 2m~4m, and the dominant bacteria of biological filtering tower combined working is the red pseudomonas in photosynthetic bacteria, 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.