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

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Windrow Turning & Aeration Oxygen concentrations of above 5% required for optimum composting

conditions.

Windrow Temperature Monitoring

Windrow Turning & Aeration

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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

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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.

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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

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Thank You