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”PROSPECTS OF IMPLEMENTING INTEGRATED WASTE MANAGEMENT IN ROMANIA”

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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, Romania LEACHATE TREATMENT TECHNOLOGIES: INTERNATIONAL CASE STUDIES Dipl. Ing. EMILIAN GHERDAN - CEO EURITEH SRL Homepage: Dipl. Ing. (FH) HUBERT WIENANDS - CTO WEHRLE Umwelt GmbH, Germany Homepage:

2 Overview 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

3 Organic compounds in landfill leachate
inorganic compounds in landfill leachate COD in (mg/l) BOD in mg/l AOX in mg/l 2.500 – 300 – 0,5 – 4,0

4 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 or depending on the flow of the river
Germany Spain GB France China 400 200 0…95% 1.500 160 100 1.000 Sewage plant River COD in mg/l Sewage plant NH4-N % mg/l <10% Romania 750 125 Chloride no requirements No require-ments or depending on the flow of the river mg Cl-/l Greece Poland Requirements Examples for International Effluent Values

6 Is it necessary to reduce the salt in each leachate treatment plant?
Chlorid emmission from a landfill in t/a 100 m3/d 150 m3/d 200 m3/d 500 mg/l Cl 18 t/a 27 t/a 36 t/a 1.000 mg/l Cl 54 t/a 72 t/a 1.500 mg/l Cl 55 t/a 77 t/a 110 t/a Only 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 harmfull substances Concentration of harmfull and non harmfull substances Anaerobic Biology Flocculation and precipitation Aerobic Biology Ultrafiltration Activated Carbon Nanofiltration Chemical Oxidation Reverse Osmosis Incineration Evaporation

8 Conditions for a fully nitrification process:
reduction of organic parameters in a biological treatment step (MBR) with fully nitrification BOD/COD COD elim. BOD effluent NH4-N effluent 0,2 60 – 70 % < 5 mg/l < 10 mg/l 0,3 70 – 80% 0,4 80 – 90 % 0,5 90 – 98 % Conditions for a fully nitrification process: pH optimum between 6.8 and 7.2 – no inhibition O2 concentration between 1.0 – 2.5 mgO2/l Sludge age > 15 d

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

10 Treatment concepts which doesn´t work substainable, but very common in some east european countries
Years Pretreatment: 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

11 B: Case Studies Prozess combination (Elimination concept)
Agenda B: Case Studies Prozess combination (Elimination concept) B 1: MBR Plants in landfill leachate and Mechanical solid waste treatment (MBT) plants

12 flow sheet: MBR with external membranes

13 Leachate from municipal solid waste landfill, Laogang Shanghai
Daily flow: 3 loops total 4,750 m3/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: ,000 mg/l NH4-N: mg/l Largest landfill leachate treatment plant in the world!

14 B: Case Studies Prozess combination (Elimination concept)
Agenda B: Case Studies Prozess combination (Elimination concept) B 2: MBR Plants with activated carbon

15 Membrane BioReactor (MBR) + activated carbon (AC)
flow scheme

16 Leachate plant CAP LORIENT / FRANCE
Outlet concentrations: COD: 300 mg/l NH4-N: 50 kg/d 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: * 10 m3 Commissioning:

17 B: Case Studies Prozess combination (Elimination concept)
Agenda B: Case Studies Prozess combination (Elimination concept) B 3: MBR plus nanofiltration and physikal-chemical concentrate treatment

18 Membrane BioReactor (MBR) + Nanofiltration [+ physical/chemical treatment]

19 Leachate from municipal solid waste landfill, Riederberg / Austria
Country Tirol Daily flow: 80 m3/d Inlet concentration: COD: 15,000 mg/l NH4-N: 3,500 mg/l AOX: 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 NH4-N: < 10 mg/l AOX: < 0,5 mg/l Cl-: mg/l

20 Separative efficency membrane processes
50 bar 75 bar 120 bar Separative efficency membrane processes 15 – 25 bar 0 % NH3-N 50-95 % NH3-N 100 % NH3-N 5-50 % NH3-N

21 C: Case Studies Prozess combination (concentration concept)
Agenda C: Case Studies Prozess combination (concentration concept) C1: Reverse Osmosis (multi stage)

22 REVERSE OSMOSIS - Principle
Permeate Reverse Pressure

23 pretreatment sandfiltration
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 Original Leachate Treatment
Posttreatment (MBR) Spiral wounded 0.45 mil spacer Spiral wounded 0.28 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 €/m2 + Suitable with a pretreat-ment UF or MF + suitable in a second stage of a multistep RO + membrane replacement cost appr. 40 – 20 €/m2 + Suitable for higher solid concentrations + CD Plate membrane + 150 – 200 €/m2

25 Reverse Osmosis Plant – spiral wounded membranes
Landfill Grammatiko, Greece Daily flow: 175 m3/d Inlet concentration: COD: 2,000 mg/l Ntot: 1,800 mg/l

26 Reverse Osmosis Plant Da Phuoc, Vietnam – disk membrane
Daily flow: 240 m3/d Inlet concentration: COD: 20,000 mg/l NH4-N: 800 mg/l Conductivity: 25,000 µS/cm

27 Increasing Conductivity after starting concentrate recycling,
Landfill Stade, Germany concentrate back to the landfill ?

28 D1: MBR + 1 stage RO and concentrate rejection in the landfill
Agenda D: 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/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: mg/l NH4-N: < 5 mg/l Cl-: < mg/l

30 D2: MBR + Nanofiltration and concentrate rejection in the landfill
Agenda D: Case Studies Prozess combination (ellimination + concentration concept) D2: MBR + Nanofiltration and concentrate rejection in the landfill

31 Landfill Leachate, Hamici / Algeria
SPA. AMENHYD Daily flow: m3/d Inlet concentration: COD: ,000 mg/l NH4-N: ,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: mg/l NH4-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/l Cl, SO4, COD < 100mg/l NH4-N < 10 mg/l COD < 100mg/l NH4-N < 10 mg/l NANOFILTRATION REVERSE OSMOSE Cl, SO4, COD ca mg/l, NH4-N< 10 mg/l ULTRAFILTRATION MICRO/ULTRA BIOLOGIE SANDFILTER 100 % Leachate COD 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 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 THANK YOU FOR YOUR ATTENTION! Questions? Please contact:
EMILIAN GHERDAN - CEO EURITEH SRL Homepage:


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