why has reverse osmosis become the state-of-the-art ... · why reverse osmosis for landfill...
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Why Reverse Osmosis for Landfill Leachate Treatment ?
Why has
Reverse Osmosis
become the
State-of-the-art-technology
for treating leachate
from landfills across Europe?
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Leachate Formation in Landfills
Rain
Evaporation
Leachate
Production/Consump-tion by Chemical /
Biological Processes
Waste Humidity
GroundWater
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Why Treatment of Landfill Leachate ?
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Rough Mass Balance for components dissolved in Leachate
57%
43% COD
BOD5
85%
15%
In-organic
Municipal Waste Water
Landfill Leachate
Partly
„Hard COD“Not biodegradable
Landfill Leachate Pretreated Waste
>90%
<10%
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Performance of Processes for Treatment of LL
CO
D
NH
4 -N A
OX
H.
Metals
Advantages Disadvantages
Adsorption at Activated Carbon
Easy Handling, Re-generation possible
Big Qnty of Waste for Disposal / Regenration
Biological Process Suitable as First Treatment Step
Limited Performance, Sludge Disposal required
Chemical Oxidat. Small Qnty of residues High Energy Demand
Evaporation/ Drying
Process suitable for further processing of concentrated liquids
Very high Energy Demand, product for disposal, Material problems
Flocculation/Settling
Easy handling Poor Performance, chemicals required, high sludge quantity
Rembrane Process(Reverse Osmosis)
Best Quality of Purified WaterHigh Availability
Disposal/Infiltration of Residual Leachate (concentrate) necessary
Stripping Usable Product (Ammonia)
Limited Application, Treatm. of Exhaust Gas required
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Characteristics of RO for LL Treatment
Best Quality of Product Water (Permeate)
Small Footprint
Reliable at variations of Quantity and Quality
Switch-ON / Switch-OFF Operation possible
Plug & Play Installation
Treated LL (Permeate) is utilizable
Modular Construction with high Flexibility
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Product Water Quality of some Treatment Processes
.
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Product Water Quality after RO ( 1 / 2 stages)
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Footprint of Treatment Plants for LL
Biological Treatm. Plant for 4 m³/h (100 m³/d)
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Footprint of Treatment Plants for LL
RO – Treatment Plant for 4 m³/h (100 m³/d)
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Indifferent to Variations in LL Composition: COD Removal
0
2000
4000
6000
8000
10000
Date
11/ Jul/
19/ Jul/
1/ Aug/
9/ Aug/
25/ Aug/
7/ Sep/
20/ Sep/
4/ Oct/
24/ Oct/
2/ Nov/
COD RawwaterCOD Permeate
Average: 6547 mg/l
mg/l
Average reduction: 99,88%
Average: 8 mg/l
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Indifferent to Variations in LL Composition: Ammonia Removal
0
500
1000
1500
2000
2500
3000
6. J
ul.
12. J
ul.
18. J
ul.
24. J
ul.
30. J
ul.
5. A
ug.
NH4-N RawwaterNH4-N Permeate
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Switch OFF /Switch ON - Operation
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“ Plug and Play”: Containerized Mobile Installations
Qd=30 m3/day
Qd=90 m3/day
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“ Plug and Play”: Modular System Elements
DegazifierDegazifier
System ContainerSystem Container
Electric Power Supply
Electric Power Supply
Raw WaterStorage TankRaw WaterStorage TankTank ContainerTank Container
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Products of LL Treatment
Utilization / Disposal of Products
Process Bio / Bio + AC Reverse Osmosis
Treated LL
To Sewer (aftertreatment)
No Utilization
Direct Discharge to Nature
Utilization: IrrigationProcess Water
ResiduesSludge to LandfillSpent AC to external Disposal / Regeneration
Concentrate to Landfill orexternal Disposal
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Products of LL Treatment: Water Management by RO
Source Dr. Peters