ipn-israel water week

Report
IPN-ISRAEL WATER WEEK
Nitrogen Removal from Yamuna
River (India) using MBBR –
Pilot Summary
Keren Nof
Presented by: Ramiro Garza
September 2014
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Introduction
Aqwise Technology
Material and Methods
Results and Discussion
Summary and Conclusions
Questions
Proprietary and confidential
Introduction
River Water Pollution
 River Water Pollution – How?
− Due to fast urbanization and industrial growth – without appropriate
infrastructure for wastewater treatment
 The problem
− Threat to Natural Environment and human health
− Odor problems
− High Nitrate –
Blue baby syndrome
Algae Bloom
Proprietary and confidential
Case Study: Surface Water Treatment
HIGHLIGHTS
• Customer: Municipality of Agra
• Location: Yamuna River, Agra, India
• Capacity: 163,000 m3/d
REQUIREMENTS
• Need to provide safe drinking water
for population of 2 million people
SOLUTION
• Cost-efficient surface water treatment
• AGAR® MBBR and UF membrane polishing
• Adaptive to variable loads
River Water Treatment - Agra, India
Secondary effluent from WWTP’s was discharged into the river for years
resulting in elevated levels of soluble pollutants (BOD, TAN and NO3)
Proprietary and confidential
Nitrogen Compounds Removal Technologies
 Physico-chemical methods
Main Disadvantages:
− Ion-Exchange (IX)
Product brine
− Reverse Osmosis (RO)
Membrane: Scaling & Fouling
− Electrodialysis (ED)
 Biological methods
Advantages:
− Conventional Activated Sludge (CAS)
Cost effective
− Membrane Bio-Reactor (MBR)
Environmental friendly
− Sequencing Batch Reactor (SBR)
Nitrogen gas, N2 → Harmless
− Moving Bed Bio-Reactor (MBBR)
Proprietary and confidential
Pilot Plant
After the technology was selected a scaled down pilot (100m3/day) was operated for a year
Proprietary and confidential
Aqwise Technology
MBBR Technology
Free-Floating polyethylene media (Aqwise Biomass Carriers)
Moving Bed Biological Reactor
AGAR® MBBR Solutions
 Simple, single-through process
 Reduces soluble pollutants with
minimal process complexity
 Requires a significantly smaller
footprint
Proprietary and confidential
Innovation That Works
Aqwise Biomass Carriers protect biofilm against abrasion and ensure mass transfer efficiency
Recycled, high-density
polyethylene
Optimal oxygen and
nutrients transfer
Highly open
external design
Applicable for various
biological processes
> 650 m2/m3
Effective surface area
Proprietary and confidential
Customer Benefits
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SMALL FOOTPRINT
DURBLE & STABLE
Suitable for both new applications
and existing plant upgrades.
Highly resistant to hydraulic shock loads
with short recovery time after toxic loads.
COST EFFICIENT
LOW MAINTENANCE
Requires minimal civil works, short
project life cycle and lower Capex/Opex.
Simple maintenance and low
operational costs.
SCALABLE & FLEXIBLE
ECO FRIENDLY
Smooth upgrade or gradual expansion
based on just-in-time investment.
Recycled materials, less land usage, no
scenery obstruction and less sludge.
Proprietary and confidential
Materials and Methods
System Description
The system consists the following treatment units
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Pretreatment units: fine screen (5mm) and tube settler
Moving Bed Bio Reactor (MBBR)
Ultrafiltration for solids separation
Chlorination
External carbon
Mixer
Mixer
TubeSettler
UF
Disinfection
Inlet
Effluent
Air
Stage 1
Aerobic
Stage 2
Aerobic
Stage 3
Deox
Stage 4
Anoxic
Schematic pilot plant flow diagram
Stage 5
Aerobic
Proprietary and confidential
Design Data
 Influent Characteristics
Parameter
Design Temperature
COD
BOD5
TSS
TAN
Nitrate as N
Nitrite as N
Unit
°C
mg/l
mg/l
mg/l
mg/l
mg/l
mg/l
Inlet to the MBBR
15/30
99
29
34
17.95
5.1
0.7
 Effluent Requirements
Parameter
TAN
Nitrate as N
Unit
mg/l
mg/l
Value
1.65
9.0
Proprietary and confidential
Sampling Procedure
 Grab samples were taken daily from each of the following sampling
points: raw river water, tube-settler, MBBR stages, membrane filtration
effluent and final effluent following chlorination.
 Each of the sampling point was analyzed for pH, temperature, Dissolved
Oxygen (DO), TAN, nitrate (NO3), nitrite (NO2), soluble COD, TSS and
alkalinity
Proprietary and confidential
Results
Water Characteristics
Water temperature
Average 14°C
Min. 13°C
Average 31.9°C
Max. 34.6°C
Proprietary and confidential
Temperature Effect
TAN removal
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Average TAN effluent: 0.1±0.04 to 1.5±1.5mg/l
91 - 94% removal
97 - 99% removal
Proprietary and confidential
Temperature Effect
Nitrate removal
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Average Nitrate influent: 2.2 mg/l; after stages 1&2: 6.7 mg/l
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Average Nitrate effluent: 4.3 mg/l < 9 mg/l
Proprietary and confidential
Evaluation of each stage
MBBR stage 1 & 2
(Aerobic
)
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Removal Rates (RR) across the aerobic stages ranged between 0.45 to 2.6
gNH4/m2/d
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Relatively high removal rates in both aerobic stages emphasize the importance
and the need of two aerobic stages in sequence
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TAN effluent still above the required value  Additional aerobic stage is
required
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Although nitrification was the major mechanism for ammonia removal, about
0.04-0.96 mg/l TAN was assimilated to bacteria cells in each aerobic stage
(about 1% to 14%).
Proprietary and confidential
Evaluation of each stage
MBBR stage 3
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(Deox
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For reduction of DO concentration
Proprietary and confidential
Evaluation of each stage
MBBR stage 3
(Deox
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In order to ensure anoxic conditions, the addition of ethanol was required
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The Deox stage was not suitable for denitrification but
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allowed good conditions for the following anoxic stage
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0.5-1.0 mg/l Ammonia was assimilated in to the cells
Proprietary and confidential
Evaluation of each stage
MBBR stage 4
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(Anoxic
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Removal Rates (RR) across the anoxic stage are below 1 gNO3/m2/d, despite:
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Low DO concentration
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High C:N ratio
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Nitrite may disturb nitrate measurements (influent 0.1-5.0 mg/l)
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In order to prove this assumption, the denitrification was calculated based on
the change in the Alkalinity values
Proprietary and confidential
Evaluation of each stage
MBBR stage 4
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(Anoxic
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Higher nitrate removal should be obtained
Proprietary and confidential
Evaluation of each stage
MBBR stage 5
(Aerobic
)
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Stage 5 was designed in order to reduce the residual carbon source and ensure
final removal of ammonia
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Relatively low COD and TAN removal ; during the warmer months COD and
ammonia inlet concentrations were lower due to high activity in the previous
stages
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Assimilation was the main mechanism for TAN removal
Proprietary and confidential
Summary & Conclusions
Aqwise – Clear and Simple
 The system can consistently produce high drinking water
quality, reducing pollutants levels to below the required
concentrations
 The nitrification- denitrification processes were able to cope
very well with the changes in the contaminants
concentration in the water (temperature range between
13.0 to 34.6°C)
Proprietary and confidential
Questions ?
Anoxic stage
Aerobic stage
Proprietary and confidential
Contact Information
Contact us for further information about Aqwise solutions
Keren Nof
Senior Process Engineer
Email
Telephone
Website
[email protected]
+972-9-9591901
www.aqwise.com

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