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Seite 1 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Dipl. Ing. (FH) HUBERT WIENANDS - CTO WEHRLE Umwelt GmbH, Germany Homepage: www.wehrle-environmental.com.

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Presentation on theme: "Seite 1 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Dipl. Ing. (FH) HUBERT WIENANDS - CTO WEHRLE Umwelt GmbH, Germany Homepage: www.wehrle-environmental.com."— Presentation transcript:

1 Seite 1 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Dipl. Ing. (FH) HUBERT WIENANDS - CTO WEHRLE Umwelt GmbH, Germany Homepage: LEACHATE TREATMENT TECHNOLOGIES: INTERNATIONAL CASE STUDIES Dipl. Ing. EMILIAN GHERDAN - CEO EURITEH SRL Homepage: ”PROSPECTS OF IMPLEMENTING INTEGRATED WASTE MANAGEMENT IN ROMANIA” BETWEEN 2014 – 2020” 25/27, June, 2014, Mamaia, Romania

2 Seite 2 Leachate treatment technologies 26 June, 2014, Mamaia, Romania A: Basic Information about leachate treatment B: Case Studies process combination (Elimination concept) B1: MBR in leachate and MBT plants B2: MBR + Activated Carbon B4: MBR + Nanofiltration + Activated Carbon C: Case Studies process combination (Concentration concept) C1: RO for raw leachate treatment D: Case Studies process combination (Elimination + Concentration concept) D1: MBR + Nanofiltration D2: MBR + Reverse osmosis Overview

3 Seite 3 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Organic compounds in landfill leachate inorganic compounds in landfill leachate COD in (mg/l)BOD in mg/lAOX in mg/l – – ,5 – 4,0

4 Seite 4 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Which harmfull substances we have to reduce in the leachate? COD, BOD Nitrogen compounds Heavy metalls AOX Adsorbed organic halogens Hard, non biodegrable COD Carbon hydroxides A reduction of the salts depends on the river quantity and quality,

5 Seite 5 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Germany Spain GB France China …95% Sewage plant River COD in mg/l Sewage plant River NH 4 -N % mg/l < 10% Romania Sewage plant River Chloride in mg/l no requirements No require- ments or depending on the flow of the river mg Cl-/l Greece Poland Requirements mg Cl-/l Examples for International Effluent Values

6 Seite 6 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Only in Germany we put 1.6 Mio t/a Salt in average on the road 100 m3/d150 m3/d200 m3/d 500 mg/l Cl18 t/a27 t/a36 t/a mg/l Cl36 t/a54 t/a72 t/a mg/l Cl55 t/a77 t/a110 t/a Chlorid emmission from a landfill in t/a Is it necessary to reduce the salt in each leachate treatment plant?

7 Seite 7 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Elimination of harmfull substances Concentration of harmfull and non harmfull substances Anaerobic Biology Flocculation and precipitation Aerobic Biology Nanofiltration Activated Carbon Reverse Osmosis Chemical Oxidation Ultrafiltration Incineration Evaporation Treatment concept based upon Elimination or concentration?

8 Seite 8 Leachate treatment technologies 26 June, 2014, Mamaia, Romania reduction of organic parameters in a biological treatment step (MBR) with fully nitrification BOD/CODCOD elim.BOD effluentNH4-N effluent 0,260 – 70 %< 5 mg/l< 10 mg/l 0,370 – 80%< 5 mg/l< 10 mg/l 0,480 – 90 %< 5 mg/l< 10 mg/l 0,590 – 98 %< 5 mg/l< 10 mg/l pH optimum between 6.8 and 7.2 – no inhibition O2 concentration between 1.0 – 2.5 mgO2/l Sludge age > 15 d Conditions for a fully nitrification process:

9 Seite 9 Leachate treatment technologies 26 June, 2014, Mamaia, Romania EFFLUENT REQUIREMENT LEVEL Aerated Lagoon MBR % COD elimination NH4-N < 10 mg/l SBR Nitrifikation % BOD eli. NH4-N < 100 mg/l 3 Step RO % COD eli. NH4-N retention > 97 % SBR % BOD reduction TECHNOLOGY LEVEL Partial BOD reduction Partial Nitrification Fully Nitrification “Hard” COD elimination Salt / Chloride retention NF % COD eli. AK % COD eli. MBR % COD elimination NH4-N < 10 mg/l MBR % COD elimination NH4-N < 10 mg/l MBR % COD elimination NH4-N < 10 mg/l MBR % COD elimination NH4-N < 10 mg/l NF % COD eli. Reverse Osmosis % COD eli. NH4-N reten.> 97 % RO Chloride retention Possible treatment combinations

10 Seite 10 Leachate treatment technologies 26 June, 2014, Mamaia, Romania YearsPretreatment: SBR with no fully Nitrification Posttreatment: Reverseosmose 1 – 2 Operates good for BOD removal, partly nitrification depending on pH and Temperature Good reduction for salts and organic components, akzeptable yield by 80 % 2 – 5 akzeptable BOD removal, increasing hardness and pH, Nitrification breaks down for NH3-N inhibition Influent parameters, sulfic acid consumption and operation costs increasing, Yield decrease 70 % > 5 Problems with NH3-N stripping leads to odour problems, no nitrification, pH problems, precipitation of anorganic matter High 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 Treatment concepts which doesn´t work substainable, but very common in some east european countries

11 Seite 11 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda B: Case Studies Prozess combination (Elimination concept) B 1: MBR Plants in landfill leachate and Mechanical solid waste treatment (MBT) plants

12 Seite 12 Leachate treatment technologies 26 June, 2014, Mamaia, Romania flow sheet: MBR with external membranes

13 Seite 13 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Leachate from municipal solid waste landfill, Laogang Shanghai  Daily flow: 3 loops total 4,750 m 3 /d  Inlet concentration: COD:11,500 mg/l NH4-N: 1,400 mg/l  Process / Equipment units: Membrane Bioreactor  Project: Designed and built by WEHRLE operated by the client. Commissioning: 2011  Outlet concentration: COD: 1,000 mg/l NH 4 -N: 150 mg/l Largest landfill leachate treatment plant in the world!

14 Seite 14 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda B: Case Studies Prozess combination (Elimination concept) B 2: MBR Plants with activated carbon

15 Seite 15 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Membrane BioReactor (MBR) + activated carbon (AC) flow scheme

16 Seite 16 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Leachate plant CAP LORIENT / FRANCE  Daily Flow:140 m3/d  Inlet concentration: COD: mg/l NH4-N: mg/l  Plant concept: Denitrification:2 * 25 m3 Nitrification:3 * 25 m3 Ultrafiltration:Cross Flow Activated carbon: 2 * 10 m3  Commissioning: 2003 Outlet concentrations: COD:300 mg/l NH4-N: 50 kg/d

17 Seite 17 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda B: Case Studies Prozess combination (Elimination concept) B 3: MBR plus nanofiltration and physikal- chemical concentrate treatment

18 Seite 18 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Membrane BioReactor (MBR) + Nanofiltration [+ physical/chemical treatment]

19 Seite 19 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Leachate from municipal solid waste landfill, Riederberg / Austria  Daily flow:80 m3/d  Inlet concentration: COD:15,000 mg/l NH4-N: 3,500 mg/l AOX: 2 mg/l Cl-: mg/l  Process / Equipment units: MBR BIOMEMBRAT® plus Nanofiltration +Activated Carbon  Project: Designed, built and operated by WEHRLE Umwelt GmbH Commissioning: 2012 Outlet concentration: COD: < 300 mg/l NH 4 -N: < 10 mg/l AOX: < 0,5 mg/l Cl-: 8.000mg/l Country Tirol

20 Seite 20 Leachate treatment technologies 26 June, 2014, Mamaia, Romania 50 bar 75 bar 120 bar Separative efficency membrane processes 15 – 25 bar % NH3-N 5-50 % NH3-N 0 % NH3-N 100 % NH3-N

21 Seite 21 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda C: Case Studies Prozess combination (concentration concept) C1: Reverse Osmosis (multi stage)

22 Seite 22 Leachate treatment technologies 26 June, 2014, Mamaia, Romania REVERSE OSMOSIS - Principle Permeate Pressur e Reverse

23 Seite 23 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Flow scheme of two stage reverse osmosis plant Antiscalant RO1 RO2 leachate from lagune concentrate RO back to landfill site Permeate RO1 Permeate RO2 Concentrate RO2 sulfuric acid 50 or 98 % pretreatment sandfiltration

24 Seite 24 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Original Leachate Treatment + Suitable for higher solid concentrations + CD Plate membrane – 200 €/m 2 Spiral wounded 0.45 mil spacer + Suitable in low solid concentration and with a Sandfilter as pretreatment + suitable in the first stage of a multistep RO + membrane replacement cost appr. 60 – 40 €/m 2 Spiral wounded 0.28 mil spacer + Suitable with a pretreat- ment UF or MF + suitable in a second stage of a multistep RO + membrane replacement cost appr. 40 – 20 €/m 2 Posttreatment (MBR)

25 Seite 25 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Daily flow:175 m 3 /d Inlet concentration: COD: 2,000 mg/l N tot :1,800 mg/l Reverse Osmosis Plant – spiral wounded membranes Landfill Grammatiko, Greece

26 Seite 26 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Daily flow:240 m 3 /d Inlet concentration: COD:20,000 mg/l NH 4 -N:800 mg/l Conductivity:25,000 µS/cm Reverse Osmosis Plant Da Phuoc, Vietnam – disk membrane

27 Seite 27 Leachate treatment technologies 26 June, 2014, Mamaia, Romania concentrate back to the landfill ? Increasing Conductivity after starting concentrate recycling, Landfill Stade, Germany

28 Seite 28 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda D: Case Studies Prozess combination (ellimination + concentration concept) D1: MBR + 1 stage RO and concentrate rejection in the landfill

29 Seite 29 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Landfill leachate, Djebel Chékir / Tunisia  Daily flow: 440 m3/d  Inlet concentrations: COD: 30,000 mg/l NH4-N: 4,000 mg/l Cl-: mg/l Condictivity: uS/cm  Process / Equipment units: Flotation + MBR BIOMEMBRAT® + RO  Project: Designed and built by WEHRLE Umwelt GmbH, operated by the client Commissioning: 2012  Outlet concentrations: COD: 90 mg/l NH4-N: < 5 mg/l Cl-: < mg/l

30 Seite 30 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Agenda D: Case Studies Prozess combination (ellimination + concentration concept) D2: MBR + Nanofiltration and concentrate rejection in the landfill

31 Seite 31 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Landfill Leachate, Hamici / Algeria  Daily flow: 80 m 3 /d  Inlet concentration: COD: 10,000 mg/l NH4-N: 2,650 mg/l  Process / Equipment Units: Membrane Bioreactor BIOMEMBRAT® Nanofiltration  Project: Designed and built by WEHRLE operated by the client  Commissioning: 2014  Outlet concentration: COD: 500 mg/l NH 4 -N: 50 mg/l SPA. AMENHYD

32 Seite 32 Leachate treatment technologies 26 June, 2014, Mamaia, Romania 100 % Leachate COD ca. 10 g/l, BOD, TKN, TP, Cl, SO4, Ca, Na, % NF-Konz. COD mg/l, SO4, NO3-N, NH4-N < % RO-Konz. COD 40 g/l, Cl, SO4, NH4-N mg/l SANDFILTER MICRO/ULTRA REVERSE OSMOSE COD < 100mg/l NH4-N < 10 mg/l BIOLOGIE ULTRAFILTRATION NANOFILTRATION Cl, SO4, COD < 100mg/l NH4-N < 10 mg/l Cl, SO4, COD ca mg/l, NH4-N< 10 mg/l concentrate back to the landfill ? Comparision between NF Concentrate and RO Concentrate rejection

33 Seite 33 Leachate treatment technologies 26 June, 2014, Mamaia, Romania Conclusion from WEHRLE experience about more then 25 years and over 250 installations in landfill leachate or MBT waste water treatment Leachate 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 Seite 34 Leachate treatment technologies 26 June, 2014, Mamaia, Romania THANK YOU FOR YOUR ATTENTION! EMILIAN GHERDAN - CEO EURITEH SRL Homepage: Questions? Please contact:


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