Presentation on theme: "”PROSPECTS OF IMPLEMENTING INTEGRATED WASTE MANAGEMENT IN ROMANIA”"— Presentation transcript:
1 ”PROSPECTS OF IMPLEMENTING INTEGRATED WASTE MANAGEMENT IN ROMANIA” BETWEEN 2014 – 2020”25/27, June, 2014, Mamaia, RomaniaLEACHATE TREATMENT TECHNOLOGIES:INTERNATIONAL CASE STUDIESDipl. Ing. EMILIAN GHERDAN - CEOEURITEH SRLHomepage:Dipl. Ing. (FH) HUBERT WIENANDS - CTOWEHRLE Umwelt GmbH, GermanyHomepage:
2 Overview A: Basic Information about leachate treatment B: Case Studies process combination (Elimination concept)B1: MBR in leachate and MBT plantsB2: MBR + Activated CarbonB4: MBR + Nanofiltration + Activated CarbonC: Case Studies process combination (Concentration concept)C1: RO for raw leachate treatmentD: Case Studies process combination (Elimination + Concentration concept)D1: MBR + NanofiltrationD2: MBR + Reverse osmosis
3 Organic compounds in landfill leachate inorganic compounds in landfill leachateCOD in (mg/l)BOD in mg/lAOX in mg/l2.500 –300 –0,5 – 4,0
4 Which harmfull substances we have to reduce in the leachate? COD, BODNitrogen compoundsHeavy metallsAOX Adsorbed organic halogensHard, non biodegrable CODCarbon hydroxidesA reduction of the salts depends on the river quantity and quality,
5 or depending on the flow of the river GermanySpainGBFranceChina4002000…95%1.5001601001.000SewageplantRiverCODin mg/lSewage plantNH4-N% mg/l<10%Romania750125Chlorideno requirementsNo require-mentsor depending on the flow of the rivermg Cl-/lGreecePolandRequirementsExamples for International Effluent Values
6 Is it necessary to reduce the salt in each leachate treatment plant? Chlorid emmission from a landfill in t/a100 m3/d150 m3/d200 m3/d500 mg/l Cl18 t/a27 t/a36 t/a1.000 mg/l Cl54 t/a72 t/a1.500 mg/l Cl55 t/a77 t/a110 t/aOnly in Germany we put 1.6 Mio t/a Salt in average on the road
7 Treatment concept based upon Elimination or concentration? Elimination of harmfullsubstancesConcentration of harmfull and nonharmfull substancesAnaerobic BiologyFlocculation and precipitationAerobic BiologyUltrafiltrationActivated CarbonNanofiltrationChemical OxidationReverse OsmosisIncinerationEvaporation
8 Conditions for a fully nitrification process: reduction of organic parameters in a biological treatment step (MBR) with fully nitrificationBOD/CODCOD elim.BOD effluentNH4-N effluent0,260 – 70 %< 5 mg/l< 10 mg/l0,370 – 80%0,480 – 90 %0,590 – 98 %Conditions for a fully nitrification process:pH optimum between 6.8 and 7.2 – no inhibitionO2 concentration between 1.0 – 2.5 mgO2/lSludge age > 15 d
10 Treatment concepts which doesn´t work substainable, but very common in some east european countries YearsPretreatment:SBR with no fully NitrificationPosttreatment:Reverseosmose1 – 2Operates good for BOD removal, partly nitrification depending on pH and TemperatureGood reduction for salts and organic components, akzeptable yield by 80 %2 – 5akzeptable BOD removal, increasing hardness and pH, Nitrification breaks down for NH3-N inhibitionInfluent parameters, sulfic acid consumption and operation costs increasing,Yield decrease 70 %> 5Problems with NH3-N stripping leads to odour problems, no nitrification, pH problems, precipitation of anorganic matterHigh costs for membrane replacement, high sulfic acid consumption, high NH4-N concentration,,Yield 50 – 60 %SBR + RO with concentrat rejection in the landfill- Problems created during the plant lifetime
11 B: Case Studies Prozess combination (Elimination concept) AgendaB: Case Studies Prozess combination (Elimination concept)B 1: MBR Plants in landfill leachate and Mechanical solid waste treatment (MBT) plants
13 Leachate from municipal solid waste landfill, Laogang Shanghai Daily flow: 3 loops total 4,750 m3/dInlet concentration:COD: 11,500 mg/lNH4-N: 1,400 mg/lProcess / Equipment units:Membrane BioreactorProject:Designed and built by WEHRLEoperated by the client.Commissioning: 2011Outlet concentration:COD: ,000 mg/lNH4-N: mg/lLargest landfill leachate treatment plant in the world!
14 B: Case Studies Prozess combination (Elimination concept) AgendaB: Case Studies Prozess combination (Elimination concept)B 2: MBR Plants with activated carbon
23 pretreatment sandfiltration Flow scheme of two stage reverse osmosis plantAntiscalantRO1RO2leachate from laguneconcentrate RO backto landfill sitePermeate RO1Permeate RO2Concentrate RO2sulfuric acid 50 or 98 %pretreatment sandfiltration
24 Original Leachate Treatment Posttreatment (MBR)Spiral wounded0.45 mil spacerSpiral wounded0.28 mil spacer+ Suitable in low solid concentration and with a Sandfilter as pretreatment+ suitable in the first stageof a multistep RO+ membrane replacement cost appr. 60 – 40 €/m2+ Suitable with a pretreat-ment UF or MF+ suitable in a second stageof a multistep RO+ membrane replacement cost appr. 40 – 20 €/m2+ Suitable for higher solid concentrations+ CD Plate membrane+ 150 – 200 €/m2
27 Increasing Conductivity after starting concentrate recycling, Landfill Stade, Germanyconcentrate back to the landfill ?
28 D1: MBR + 1 stage RO and concentrate rejection in the landfill AgendaD: Case Studies Prozess combination (ellimination + concentration concept)D1: MBR + 1 stage RO and concentrate rejection in the landfill
29 Landfill leachate, Djebel Chékir / Tunisia Daily flow: m3/dInlet concentrations:COD: 30,000 mg/lNH4-N: 4,000 mg/lCl-: mg/lCondictivity: uS/cmProcess / Equipment units:Flotation +MBR BIOMEMBRAT® +ROProject:Designed and built byWEHRLE Umwelt GmbH,operated by the clientCommissioning: 2012Outlet concentrations:COD: mg/lNH4-N: < 5 mg/lCl-: < mg/l
30 D2: MBR + Nanofiltration and concentrate rejection in the landfill AgendaD: Case Studies Prozess combination (ellimination + concentration concept)D2: MBR + Nanofiltration and concentrate rejection in the landfill
31 Landfill Leachate, Hamici / Algeria SPA. AMENHYDDaily flow: m3/dInlet concentration:COD: ,000 mg/lNH4-N: ,650 mg/lProcess / Equipment Units:Membrane Bioreactor BIOMEMBRAT®NanofiltrationProject:Designed and built by WEHRLEoperated by the clientCommissioning: 2014Outlet concentration:COD: mg/lNH4-N: mg/l
32 Comparision between NF Concentrate and RO Concentrate rejection % NF-Konz.COD mg/l, SO4,NO3-N, NH4-N < 10% RO-Konz.COD 40 g/l, Cl, SO4,NH4-N mg/lCl, SO4, COD < 100mg/lNH4-N < 10 mg/lCOD < 100mg/lNH4-N < 10 mg/lNANOFILTRATIONREVERSE OSMOSECl, SO4, COD ca mg/l,NH4-N< 10 mg/lULTRAFILTRATIONMICRO/ULTRABIOLOGIESANDFILTER100 % LeachateCOD ca. 10 g/l, BOD, TKN, TP,Cl, SO4, Ca, Na,concentrate back to the landfill ?
33 Conclusion from WEHRLE experience about more then 25 years and over 250 installations in landfill leachate or MBT waste water treatmentLeachate treatment is difficult, but possible – more than plants over whole Europe can be visited. Be carefull in new technologies and new treatment concepts, at least the risk´s are on landfill operators side!landfill leachate contains harmfull pollutants - elimination is prefer to concentration!It is recommend to choose in the first treatment step an efficient biological process which can reach a maximum biological reduction. (NH4-N < 10 mg/l). In a post treatment step activated carbon or membran technology are more sustainable and cost effective (in comparison to an partly biological treatment in (low investment) SBR)Leachate has a high buffer capacity, so all treatment processes, where a pH change is necessary are very critical and has failed over the past 25 years (electroflotation and coagulation, stripping) .direct filtration technologies (RO) or other concentration technologies produce liquid residuals. Re - filtration of liquid residuals in the landfill are precarious and reduce the plant performance on the long end. (increasing of the buffer system, corrosion, higher concentrate amount) – and beside this it is not allowed under the EU landfill directive!!!!If possible, drain off the salts and do not lead them back into the landfill. This will ensure a stable operation on a long-term basis. If a Chloride reduction is required, separate the chlorides after the reduction of all the organics and the nitrogens. That gives new possibilities to dispose the salty concentrate.
34 THANK YOU FOR YOUR ATTENTION! Questions? Please contact: EMILIAN GHERDAN - CEOEURITEH SRLHomepage: