CASE STUDY LOCHALINE TTU

THE MODULAR

WATER EXPERTS TREATMENT

Project Title: Lochaline WTW (TTU) Project Manager: Daniel Sutherland – RSE Water Technologies Muir of Ord Client: ESD for Scottish Water Project Value: £3.1M Design Start: 8th July 2016 Manufacture Start: 18th July 2016 Delivery to Site: 1st March 2017 Commissioned / WIS: 15th May 2017 Works Address: Lochaline, PA80 5UY

www.ross-eng.com Case Study / Lochaline TTU

Project Overview:

The Lochaline WTW was identifi ed for replacement An e ective cryptosporidium barrier was required at Lochaline WTW. To with a membrane treatment plant as part of the achieve this a Nanofi ltration (NF) Scottish Water SR15 Water Quality Enhancement Membrane based process was installed adjacent to the existing plant. The Intervention Programme due to the risk of water maximum raw water fl ow to the works quality failures and growth in demand in the local was 90m³/day during Phase 1 of this supply zone. project, however the NF plant delivered during this phase, was sized to deliver the full Phase 2 (Growth) deployable output of up to 195m³/day.

Through the Scottish Water Alliance with ESD, RSE Group was engaged to design, manufacture and install a 195m3/d Nanofi ltration Transportable Treatment Unit (TTU) membrane plant operating at 85% recovery, on the Lochaline WTW Lochaline site.

Phase 1a of the project included Inlet Strainers, Membrane Feed Pumps, Recirculation Pumps, Nanofi ltration Membranes, CIP facility, Sodium Hypochlorite dosing, Chlorine Contact Pipe, Remineralisation Tank, Chemical Waste Tank, Site Control System, Oban Telemetry and Welfare Facilities, all housed within the TTU. Other work included a Dechlorination Chamber, Standby Generator, and Septic Tank

Fig 1 - Works location map Phase 1b of the project included a new 146.3m³ capacity Clear Water Tank (CWT-1) and a Treated Water Pumping Station.

Phase 2 (Growth) will involve the construction of a new Service Reservoir and changes to the Treated Water Pumping Station installed under Phase 1b. This work has not yet been allocated to any Contractor.

Lochaline - Site before the new works were carried out Case Study / Lochaline TTU

Project Overview: The TTU product allows us the take the Clients requirements and Specifi cation Documentation right through design to manufacture in our own workshops.

An innovative design approach was pioneering approach which led to them build that would originally be carried required due to site topography and bringing the main process line within out on site can now be fabricated, access constraints, this allowed for the the dosing unit, negating the need for painted and constructed in a controlled incorporation of a modularised welfare extensive pipework runs and reduced environment allowing us to incorporate unit to accommodate all of Scottish the installation and maintenance the mechanical and electrical elements Water’s operational requirements, and requirements. in the design and build of the treatment has been well received by our clients. process. The commissioning of the The TTU was designed and assembled at plant is carried out before we even Utilising our group manufacturing Ross-shire Engineering’s base in Muir of get to site. Once we are happy that capability ensures a collaborative Ord before undergoing comprehensive everything is working to 100% then we approach for our clients. As principle testing. can separate the units and transport contractor RSE manufactured and to site, with the knowledge that once With all construction at a single location produced the 4 section module TTU. it gets to site then it is going to be our product is unique, as our company Our sister chemical dosing company a full turnkey solution, working fi rst has grown and evolved our facilities have PSI were engaged to manufacture time and give the maximum customer grown with us. A lot of the traditional civil a modular solution for the Sodium satisfaction. Hypochlorite dosing. PSI adopted a

Lochaline TTU Floorplan Case Study / Lochaline TTU

Lochaline WTW – 3D Elevation Lochaline WTW – 3D model

Lochaline WTW – 3D Section Case Study / Lochaline TTU

Our design team transforms an outline Water Treatment plant concept, into the Modular Build Solution using the latest Auto Desk Inventor software. From that we can produce fabrication drawings which can then be sent out to our workshop.

We have control over the manufacturing The capability in design approach and Following testing and commissioning of the plant as our design office is philosophy allows us to grow out with the Lochaline plant is separated into its only a short 2 minute walk away from . four modules and carefully prepared the workshop. Having our o ce and for the 118 mile journey by road to its manufacturing facility in the same The units can be closed, fully clad, permanent home via the A9, the A82 location saves time compared to a sealed and ready to be shipped by road and the crossing. traditional drive to site to monitor the or boat to anywhere in the world. This construction of the plant. philosophy is scalable and is something that RSE are continuously developing. Case Study / Lochaline TTU

Water Quality Tables

The raw water treatment plant and in particular pre-treatment, NF membranes, CIP and post treatment remineralisation were selected based on suitability for operation to treat the following raw water quality envelope.

Raw Water Quality Envelope (Alt Achad Forsa – raw water source)

Parameter Unit No. Samples Maximum Mean Minimum 95%ile

Colour Deg Hazen 53 90 11.1 2 29.9

Conductivity µS/cm at 20°C 4 89 82.3 78 88.1

Hydrogen Ion pH value 32 7.8 7.5 7.2 7.7

Suspended Solids Mg/l 4 4.0 3.3 2 4.0

Total Organic Carbon Mg C/l 29 4.5 1.6 <0.5 3.8

Turbidity NTU 48 2.4 0.4 0.2 1.4

UV Transmittance % 29 96.4 85.7 55.2 95.7

Bromide µg Br/l 2 48 43.3 38.6 47.5

Aluminium µg Al/l 29 121 51.3 11 97.2

Dissolved Iron µg Fe/l 2 93 63.5 34 90.1

Iron µg Fe/l 49 299 55.9 <7 164

Manganese µgMn/l 51 11.7 1.9 0.7 5.6

Presumptive E. Coli CFU in 100ml 32 220 18.1 0 102

Presumptive Coliforms CFU in 100ml 32 1600 235 6 632 Case Study / Lochaline TTU

Water to Supply – Treated Water Quality Targets

Parameter Unit RSE Target The Public Water Supplies The Water Supply (Scotland) (Water Quality) (England & Wales) Regs 2014 No. 364 Regs 2016 No. 614

Colour Deg Hazen 5 20 20

Total Iron µgFe/l 50 200 200

Total Manganese µgMg/l 10 50 50

Total Aluminium µgAl/l 50 200 200

Total Organic Carbon mgC/l 2 No abnormal change No abnormal change

Total THM µg/l 40 100 100

Turbidity NTU 0.4 4 4

Free Chlorine mg/l 0.2–2.0 - -

Hydrogen Ion pH Value 7.8-9.2 6.5-9.5 6.5-9.5

Treated Water – Performance Test Results

Parameter Unit Minimum Maximum Mean 95th Percentile Count

Colour Deg Hazen <2 2 <2 <2 36

Hydrogen ion pH value 7.8 7.9 7.8 7.9 7

Turbidity NTU <0.2 0.2 <0.2 <0.2 36

THM: Total mg/l <3.2 10.7 6 9.2 34

Aluminium µgAl/l 9 20 13.5 18.5 36

Iron µgFe/l <7 13 <7 <7 36

Manganese µgMn/l <1 <1 <1 <1 36

Coliform bacteria cfu/100 ml 0 0 0 0 30

E. coli cfu/100 ml 0 0 0 0 30

Note:- ‘<’ denotes laboratory detection limit. Case Study / Lochaline TTU

Membrane Cleaning

Foam Ball Cleaning Yes Frequency Daily (Every 4 hours; duration 10 minutes) Frequency of CIP Cleaning Every 3 months Chemicals used for CIP cleaning Citric Acid / Sodium Hypochlorite

Sodium Hypochlorite dosing PSI adopted a pioneering approach which led to bringing the main process line within the dosing unit, negating the need for extensive pipework runs and reduced the installation and maintenance requirements.

Chlorine Contact Pipe (CCP) The Chlorinated Water fl ows through the Chlorine Contact Pipe (CCP) to ensure that there is the required contact time for disinfection. Incorporating the CCP within the modular construction has reduced the amount of civils work on site

Waste Water Tank The Waste Water Tank has been incorporated within the modular structure, which has allowed it to be constructed in steel and reduce the amount of civil work on site.

Laboratory and Welfare Facilities Case Study / Lochaline TTU

Quotes

The project was successfully completed on time, defect free with acceptance from Scottish water. Scottish Water operatives are pleased with the new plant’s performance, see post below from Douglas Millican, Scottish Water CEO, following a recent visit to the site.

Jeff Forrester - ESD, Delivery Project Manager

Challenges to a project like Lochaline are disruption to the local community which we want to keep to a minimum.

The advantages of a Transportable Treatment Unit (TTU) is that the programme is reduced, management of traffi c is reduced to a minimum and there is less disruption to the local community, this is very important as it allows them to be engaged and on board with the project. This has been very successful on the Lochaline project. Residents live very close to the site, keeping them engaged allows them to see the time scale for disruptions has been vastly reduced due to the method of constriction that was chosen.” Case Study / Lochaline TTU

Quotes

Paul Gerard – ESD – Design Lead & Process Engineer

The Lochaline WTW was awarded to EDS from SW in May 2016.

With the assistance from RSE, the design was agreed, developed and a full working solution was delivered to site within 8 months in January 2017.

The project rocketed along at a very high speed and worked fi rst time. This was only through the strong collaboration between ESD, SW and RSE Design and Delivery teams.

The early engagement with RSE has allowed the innovative modular approach to water treatment and has transformed the industry, especially in more remote locations. Lochaline is a successful example of supply chain collaboration, working together to provide a positive and successful outcome for SW and their customers.

The challenges on this project were the time frames due to the water quality at Lochaline, the site size and location”

Gavin Steel, Scottish Water’s Regional Communities Manager for the Highlands, said:

“This project is a great example of Scottish Water, ESD and Ross-shire Engineering working together to deliver a positive result for our customers.” Case Study / Lochaline TTU

Scope Summary

An effective cryptosporidium barrier was installed at Lochaline WTW. To achieve this a Nanofi ltration Membrane based process with a deployable output of up to 195 m³/day. Also included are provision for Welfare Facilities, Membrane Feed Pumps, new Clear Water Tank (CWT-1) of capacity 146.3m³, Remineralisation Tank, Chlorine Contact Pipe, Dechlorination Chamber, Standby Generator, Site Control System, Telemetry and new Septic Tank

• Membrane Plant building including laboratory and welfare facilities • Membrane Filter Feed Pumps • Strainers • Nanofi ltration Membrane Modules • Membrane Clean In Place (CIP) and Neutralisation facility • Permeate Tank • Permeate Pumps • Disinfection (Sodium Hypochlorite dosing and Chlorine Contact Pipe (CCP)) • pH Correction (Limestone Contact Tank) • Relift Pumps • Final Water Flow Monitoring • Water Quality Sampling for control and Regulatory purposes • Waste Water Tank • Motor Control Centres • Local Control Panels • Telemetry

Addition Site scope included:

• Dechlorination Chamber • Standby Generator • Septic Tank • Civil Groundworks & Drainage • TTU Building Foundations • Services • Clean Water Tank • Treated Water Pumping Station