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Designing, Constructing, Operating and Maintaining an
effective waste water and world class water reuse system networks in Oman
Mahmoud Abu El Saud
General Manager – Operations & Maintenance Division
Presentation to:
Oman Energy and Water Conference and Exhibition 2016
May 2016
• Objective • Haya Water Overview o Service Coverage o Sewerage Collection & Conveyance o STP o Treated Effluent Reuse
• STPs Processes Technologies
TABLE OF CONTENTS
Objective
• To provide a brief overview of Haya Water existing wastewater infrastructure
• To discuss wastewater reuse and how to maximize the usage
• To provide a brief overview on the Sewage Treatment Plant’s technologies used in Haya Water
HAYA WATER OVERVIEW
Haya Water
Haya Water is responsible for the Operation and Maintenance of Sewerage Treatment Plants, Pumping Stations, Sewerage and Treated Effluent Networks and Composting Plant throughout Muscat, including:
11 Sewage Treatment Plants, 48 Sewerage Pump Stations, 1,471 Km of Sewerage Network, 2 TE Pumping Stations, 296 Km of TE Network, 1 Composting Plant
Haya Water is currently treating approximately 140,706 m3/day of wastewater and reusing the treated effluent for irrigation purposes.
Haya Water Services
COLLECTION & CONVEYANCE
TREATMENT
REUSE EFFLUENT
COMPOST
ODOUR & GASES CONTROL AND
TREATMENT
Haya Water Service Coverage
SEWAGE COLLECTION & CONVEYANCE
Sewerage Network Technology
1. Gravity Networks • Pipeline -UPVC, GRP, HDPE, • Manholes- concrete cast in situ, Precast concrete, HDPE and polycrete • Sewerage pumping stations – Submersible pumps and dry installation
submersible pumps • Rising mains – GRP Pipes, and HDPE
2. Vacuum System
• Pipeline – HDPE • Vacuum interface valves
3. TE Networks • Pressurize pipeline – HDPE, DI and GRP • Valve chambers and measuring equipment, • Storage and balancing tanks • TE pumping stations – double suction split case centrifugal pumps
Schematic of Sewerage Networks
HAYA responsibility Sewer network
Area Length (km)
GM, Amerat & Qurayat 161.0
Bousher 549.5
Seeb 760.9
Total 1,471.4
Sewerage Collection Network
Seeb Area
Mabella
STP
MPS1 MPS2 MPS 3
Al Khoud
Coastal Strip - Vacuum System
SEWERAGE NETWORK
VS9
VS7
VS4
VS6 VS5 VS5A
VS8
VS3
VS2
VS1
Pressurize Sewer Main Gravity Sewerage Network Vacuum Network Main Collector Sewer
VS10
Bousher Area
Pressurize Sewer Main Gravity Sewerage Network STP
Al Ansab STP
SQ STP CPS
Airport Heights
SPS2 SPS1
PS16
PSQ9 PSQ10
PSQ3
PS19
PS18
LSQ1
PS17
PSIL11
LSQ6
PSQ8
PSQ13
PS2MQ
PS15
PSQ4 PSQ7
PSQ2
PSQ12
PSQ14
PS3MQ
PS3MQ
HAYA WATER SEWAGE TREATMENT PLANTS
HAYA WATER SEWAGE TREATMENT PLANTS
Sewerage Treatment Plants
No STP PROCESS Design
Capacity m3/Day
Avg. Inflow m3/Day
(Apr 2016) Inflow Collection
1 DARSAIT Activated Sludge 21,000 18,438 Network / PS
2 JIBROO Activated Sludge 150 92 Network /PS
3 Old ANSAB Activated Sludge 20,000 17,022 Tankers
4 New ANSAB MBR 57,300 59,300 Network/PS’s & Tankers
5 SAQ MBR 7,500 4,831 Network / PS
6 BOUSHER Activated Sludge 420 237 Network / PS
7 MANUMA Activated Sludge 80 146 Network / PS
8 AMERAT Activated Sludge / MBBR 650 / 200 931 Network
9 QURIYAT MBBR and MBR 1,000 / 300 392 Tankers
10 HAG MBR 200 155 Network
11 SEEB SBR 60,000 39,161 Network / PS
TOTAL 168,300 140,705
Treatment Effluent Quality April 2016
Parameter Unit Compliance
Standard Class A
Seeb STP
SBR/UF
Al Ansab STP
MBR
Darsayt STP* CAS
pH 6.0 – 9.0 7.20 7.45 7
BOD (5d @ 20ºC) mg/l < 15 5.36 3 6
Suspended Solids mg/l < 15 1.16 5.64 21.17
Ammonia Nitrogen mg/l < 15 1.56 2.55 2.34
Nitrate mg/L <50 14.92 14.71 10.72
Oil and grease mg/l < 5 0.20 0.20 0.20
Phosphorous (total as P) mg/l < 30 3.04 1.81 2.09
Faecal Coliforms /100ml < 1000 9.28 7.24 6.40
Residual Chlorine mg/l <=3 0.08 0.44 0.33
* Darsayt STP must comply with class B MECA Standards.
NEW ANSAB STP
Capacity : 57,300 m3/d
Technology: Membrane Bioreactor, MBR (Immersed Flat Sheet, KUBOTA)
Capacity : 20,000 m3/day
Technology : Conventional Activated Sludge
Old Al Ansab STP
SEEB STP
Huber Screen SBR Basin UF Cells
OSHG Centrifuge
OCU Capacity : 60,000 m3/day
Technology : SBR with Ultrafiltration
Capacity : 21,000 m3/day
Technology : Conventional Activated Sludge with Sand Filter (Tertiary Treatment)
Darsait STP
SAQ MBR
Capacity : 7,500 m3/d
Technology: Membrane Bioreactor, MBR (Immersed Hollow Fiber, Zenon)
STP PROCESS TECHNOLOGIES
HAYA TECHNOLOGY It is our endeavor to ensure the use of best practices, systems and
technologies to establish a world class Water Reuse System yielding to making Oman Greener and Healthier; hence a better and more enjoyable place to live and work.
Membrane Bioreactor (MBR) technology is among the most advanced and sophisticated systems available in the world that is used for municipal and industrial wastewater treatment – and was selected by Haya Water to produce high quality treated effluent for irrigation and coastal discharge.
SBR Sequential Batch Reactor flowed by Ultra Filtration is one of the approved technology for Sewage Treatment Plants in Haya Water to produce high quality TSE
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CONVENTIONAL ACTIVATED SLUDGE
Standard Biological sewerage treatment plants usually consist of: I. Reception chamber II. Preliminary treatment III. Aeration IV. Secondary settlement process V. Tertiary treatment
Overview of STP Technologies
Conventional Extended Aeration Activated Sludge Process
Conventional Extended Aeration Activated Sludge process is typical to Darsait, Al Ansab Tanker Facility, Bousher, Jibroo, Al Amerat and Manuma Sewage treatment Plants. The illustration below shows a simplified flow diagram for biological processes used for wastewater treatment. The influent wastewater (e.g. municipal wastewater) goes through several stages.
Grit& Grease
Primary Clarifier
Secondary Clarifier
Tertiary Filtration
Aeration Tanks
Return Activated Sludge Waste
Activated Sludge
Disinfection
Treated Effluent
Bar Screen
Influent Raw
Sewage
Primary Treatment Secondary Treatment Tertiary Treatment
Conventional Extended Aeration Activated Sludge Process
DARSAIT STP
Sequential Batch Reactor System (SBR)
SBR Cycle Illustration
2. React Fill
1. Mix Fill
3. React
4. Settle
5. Decant
ICEAS Basin Layout (Intermittent Cycle Extended Aeration System)
Pre-React Chamber
Baffle Wall
Main React Chamber Effluent
Screened & De-Gritted Sewage In Decanter
1. React 2. Settle
3. Decant Treated Effluent
Continuous Flow of Screened and Degritted Influent
ICEAS OPERATING CYCLE
Waste Sludge
SBR BASIN
FINE BUBBLE MEMBRANE DIFFUSERS Aeration System
Membrane Bioreactor System (MBR)
Membrane Bioreactor System (MBR)
This type of wastewater treatment technology is currently used in New Al Ansab, Sarooj and New Quriyat Sewage Treatment Facility. Future projects such as New Darsait and Al Amerat Sewage Treatment Plant would also utilize this type of process technology.
Pre-aeration Screening Area
Grit and oil Separator
Anoxic Zone Aeration Zone
Treated Effluent
MBR Zone
Head Works Area Biological Treatment Area MBR Area
Return Activated Sludge
Waste Activated Sludge
Membrane Bioreactor System (MBR)
Hollow Fiber Membrane used in SAQ STP Zenon Hollow Fiber Module
Flat sheet MBR
Comparison of Different Technologies
CAS SBR MBR The CAS process uses microorganisms to feed on organic contaminants in wastewater to remove Biochemical Oxygen Demand (BOD) and suspended solids, producing a high-quality effluent. The basic principle is that as microorganisms grow, they form particles (floc) that are allowed to settle at the bottom of the tank leaving a relatively clear (supernatant) liquid.
The conventional Sequencing Batch Reactor (SBR) activated sludge process operates on the fill and draw principle. The unit processes of fill, react, settle, decant and idle occur sequentially on a cyclic basis. In the conventional SBR configuration, flow is diverted from the basin during settling and decanting. This requires conventional SBRs to have two or more basins or an influent equalization tank to receive flow when basins are settling and decanting.
The MBR is the combination of Activated Sludge Treatment together with a separation of biological sludge by membranes which provide complete disinfection of the Treated Effluent (TE). The latter step replaces the Final Clarifier used in the Conventional Activated Sludge (CAS) which separates solids by gravity only.
Aerobic Reactor
Anoxic Reactor
Membrane Tank
CAS
MBR
Clarifier Aerobic Reactor
BIOLOGICAL TREATMENT
SBR
PREL
IMIN
ARY
TR
EATM
ENT
TER
TIA
RY
TREA
TMEN
T &
D
ISIN
FEC
TIO
N
DIS
INFE
CTI
ON
Aerobic Reactor
Anoxic Reactor
Raw Sewage
Membrane Tank
Pre-aeration
Aerated Grit
Removal
Screening
Activated Sludge Process
Raw Sewage
Screening Grit Removal
MBR
Clarifier Aerobic Reactor
BIOLOGICAL TREATMENT
NEW AL ANSAB STP OVERVIEW
• In 2010, the new Ansab STP was commissioned with a design capacity of 57,300 m3/d.
• Al Ansab STP receives 50% of the flow through tankers
• The second phase of the STP is planned to be operational by the end of year 2018 for an ultimate capacity of 125,000 m3/day.
AL ANSAB STP
Al Ansab STP MBR
Technology: Immersed Flat Sheet Membrane Bioreactor, MBR Membrane: Flat Sheet, KUBOTA
New Al Ansab Plant
AL ANSAB STP
TE Storage
Head Works
Biological Treatment
Old Al Ansab
Tanker Discharge
Overflow pond Bio-filter
Sludge Holding Tanks
Chemicals
Dewatering
Screenings/Grit Handling
Influent Flow
Electrical
Pre-aeration Tanks
Fine Screens Aerated Grit/Grease Removal Tanks
Blower Room
To Biological System
PRELIMINARY TREATMENT
Aerobic Reactor Anoxic Reactor
DO >1.0 mg/L
DO
0.5 mg/L
Raw Sewage
Membrane Tank
DO >2.0 mg/L
De-ox Zone
Permeate
Recirculation Flow 3 – 5 Q
DO <0.5 mg/L
Biological Treatment
• Aerobic Reactors
– Oxidation: BOD + O2 CO2 + H2O
– Nitrification: NH4+ +O2 NO2
- + NO3- +H2O
• Anoxic Reactors – Denitrification: NO3
- + O= N2 +H2O
• Anaerobic Reactors – Phosphorus Adsorption: PO4 O2 + TSS
Aerobes
Autotrophs
Poly-P
Organisms
Aerobes
SEEB STP OVERVIEW
The STP has a design capacity of 60,000 m3/d. Once completed phase II, Seeb STP capacity will reached a design capacity of 81,000 m3/d. The major processes in the STP comprise of screening, grit and grease removal, Sequential Batch Reactor (SBR) system, Ultrafiltration, disinfection, TE storage, Aerobic Digestion and Centrifuge dewatering of surplus sludge. Seeb STP commenced operations in June 2014 and it is currently as of April 2016 treating approximately 40,000 m3/day.
SEEB STP
SEEB STP
4 DIGESTERS (1 future)
UF x 6 cells 10,000 m3
TE Tank-2
OCU Centrifuge
TE Tank
FUTURE
FUTURE
CHAMBER
MPS 1
FOG
4 DIGESTERS (1 future)
A B C D A B
C D A B C D
SBR 1 SBR 2 SBR 3 SBR 4
SEEB STP - SBR
Pumping Station Pre-Treatment Secondary
Treatment Tertiary
Treatment Treated Effluent
Sludge Treatment
MPS-1 Screen, Grit & FOG S B R UF System TE Tank
Aerated Buffer Tank Centrifuge Aerobic Digestion
Emer
genc
y Se
a O
utfa
ll
FUTURE Sea Outfall
TE RAW SEWAGE
SEEB STP
Huber Screen SBR Basin UF Cells
OSHG Centrifuge OCU
TREATED EFFLUENT REUSE
Haya Water supplies treated effluent for a wide range of irrigation purposes across the Muscat area , including parks, public green areas, golf courses to keep them green and pleasant for the public. Treated water reuse also reduces dependence on groundwater or desalinated water sources ensuring the maximum use of renewable water resources.
A Greener Muscat
Area Length (km)
GM, Amerat & Qurayat 37.2 km
Bousher 112.2 km
Seeb 146.7 km
Total 296.1 km
Treated Effluent Networks
Haya Water STPs Sewage Inflow, TE Consumption and Overflows
Jan – Apr 2016
0
10,000
20,000
30,000
40,000
50,000
60,000 Da
rsai
t
Jibro
o
Amer
at
Qur
iyat
HAG
New
Ans
ab
Old
Ans
ab
Saro
oj
Bous
her
Man
uma
Seeb
M3/
D
Sewage Inflow TE Consumption Overflow (Sea outfall/Wadi)
Haya Water STPs Average YTD Flows (m3/d)
Sewage Inflow
TE Consumption Overflow
133,710.91 61,777.80 71,933.11
TE Produced vs TE Consumption Seeb Area
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
45,000
Jun Jul
Aug
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
Influent TE Network
M3/
d
From June 2015 to Apr 2016, 185,577 m3 of TE have been disposed to the sea only at Seeb Area.
Treated Effluent Facilities
TE Storage tank Al Ansab STP TE Pumping Stations Al Ansab STP
Al Ansab TE Tank
Treated Effluent Facilities
Al Khoud TE PS
Treated Effluent Facilities
Al Khoud TE Balancing Tank
Treated Effluent Facilities
Al Khoud TE Filling Station
Treated Effluent Storage
Area Storage Availability Capacity (m3)
GM, Amerat & Qurayat
• Darsayt STP TE tank • Qurayat STP TE • HAG STP • Amerat STP TE
3,000 300 400 300
Bousher • Al Ansab STP TE tank • Qurum Reservoir • SAQ STP TE tank
13,000 3,500
500
Seeb
• Seeb STP TE tanks • Al Khoud TE PS • Mabella TE PS • Al Khoud TE Balancing Tank • Mabella TE Balancing Tank
25,000 14,000 12,000
4,000 Future
TOTAL STORAGE CAPACITY 72,000
COMPOSTING PLANT KALA
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KALA
First project in the Sultanate of Oman to be CDM registered in the field of Waste Management.
First-of-its-kind composting project in the Middle East. Global recognition to the waste water management initiative
undertaken by Haya Water – Brand Enhancement. Global recognition of Haya Water’s environmental role. Carbon revenue earned through sale of carbon credits will cover a
part of the cost in operating the compost plant (175,000 credits over ten years).
Encourage implementation of similar projects in Oman and the region.
Support the country in reducing the Green House Gas emissions.
Receiving and Weighing of Raw Materials
Shredding of Green Waste
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Open Windrow System
Organics + Oxygen + Microbes = CO2 + H2O + New Biomass + Energy
Raw Material & O2 Compost
H2O Heat CO2
68
Windrow Turning & Aeration Oxygen concentrations of above 5% required for optimum composting
conditions.
Windrow Temperature Monitoring
Windrow Turning & Aeration
69
Heavy Metals
MECA Maximum concentration limits
(mg/kg)
Kala Compost Aug. 2014 (mg/kg)
Kala Compost Sep. 2014 (mg/kg)
Kala Compost Oct.2014 (mg/kg)
Cadmium (Cd) 20 1.6 1.8 1.4 Chromium (Cr) 1000 188 194 184 Copper (Cu) 1000 411 427 377 Lead (Pb) 1000 152 133 137 Mercury (Hg) 10 2.8 2.4 2.0 Molybdenum (Mo) 20 17 18 16 Nickel (Ni) 300 180 159 178 Selenium (Se) 50 6 6 5 Zinc (Zn) 3000 1060 1070 1130
Pathogens US EPA Pathogens Standard
Kala Compost Aug. 2014
Kala Compost Sep. 2014
Kala Compost Oct.2014
Fecal Coliform <1000 MPN/g DS < 1.94 < 2.02 0.00 Salmonella < 3 MPN/4g DS < 0.28 < 0.29 < 0.30 Viable Healminth Ova
< 1/4g DS 0.00 0.00 0.00
MECA & USEPA Standards
70
Kala Compost Packaging
Kala Compost Packed in: 1. Biodegradable Polyethylene Bags size 10 liters with handle. 2. Biodegradable Polyethylene Bags size 20 liters. 3. Biodegradable Polyethylene Bags size 50 liters.
71
S.N LOCATION Jan Feb Mar Apr May Jun Jul Age Sep Oct Nov Dec TRIPS Total Weight Ton.
1 Al Ansab STP 252 187 261 177 165 228 180 190 150 181 182 226 2379 28,334
2 Darsait STP 42 51 43 5 3 16 35 40 37 48 25 28 373 4,521
3 Quriyat STP 1 3 5 5 3 3 4 4 4 4 4 5 45 360
4 Seeb STP 29 3 26 30 39 27 44 13 14 15 29 49 318 3,839
Total 37,054
Item Jan Feb Mar Apr May Jun Jul Age Sep Oct Nov Dec TRIPS Total Weight Ton
Green Waste 47 55 78 118 131 175 147 210 117 60 82 116 1,336 3,380
Horse Bedding 3 8 0 5 7 1 1 7 6 3 2 3 46 271
Scrap Wood 4 5 3 6 3 6 8 16 7 6 10 8 82 176
Total 3,827
Item Jan Feb Mar Apr May Jun Jul Age Sep Oct Nov Dec Total
Bags 50 liters 13,670 40,030 30,128 35,134 25,079 13,918 22,965 35,066 46,929 40,136 40,194 38,163 381,412
Biosolids
Bulking Agents
Kala Compost Production
Quantity of Materials Treated in 2015
HAYA WATER SERVES THE SOCITY AND PROTECTS THE
ENVIRNMENT Reduced Carbon Footprint i. One of the by-products of the Haya Water project has been the
creation of the Kala Composting Plant that is located at Al Amerat. This enables the efficient reuse of sewage biosolids, and green waste and converts them to compost that can be used for agriculture, landscaping and for individual gardens – enabling a reduction in the overall production of harmful greenhouse gases.
ii. As a result today 100 per cent of all sewage biosolids generated by the company’s water reuse treatment project is treated and converted to compost – instead of being dumped into a landfill site. As a result, Haya Water was registered by UNFCCC under Clean Development Mechanism (CDM).
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Haya Water Contribution to the Environment
74
Thank You
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