Tank vent system

Process Plant First Level Deck A total flow rate capacity of 8000m³, working with 4 (four) pumps of 1000m³/hr flow rate in each tank can provide high level of aeration or oxidation.

Main Considerations

• This presentation is an alternative technique to prevent theproblems which come from the installation of a sewagetreatment plant related to the construction services andenvironmental impact onshore

• This proposal, despite its bold look, is a paradigm change forsewage treatment environment and presents notechnological challenges as it is based on the classic sewagetreatment processes converted to work in a subseaenvironment

• The feasibility of an underwater process, is based on theapplication of a process of aeration / oxidation that enablesmore precise control of air flow and / or oxygen applied to agiven volume of effluent

• This treatment is made possible due to the possibility of asubstantial reduction in the area of the treatment plant,through the application of new technologies that use theventure and vortex process which are already in use on shipsfor the treatment of ballast water

Main Considerations

• The presentation describes the basic concepts to be appliedto the development of the project, to be further developedon the basis of information yet to be provided

• The results to be obtained for the specifications of theeffluents to be discharged into the ocean, can follow aschedule of progress according to the project evolutioncurve

• We consider in order, the following factors are most strikingin the deployment cost of this offshore project whencompared to onshore:

1. Depth determined for the subsea facilities2. Meteorological window for service at sea

RESPONSIBLES

Main Technical Partnership

The new proposal for the sewage outfalls is to simply adapt the subsea offshore technology currently in use in the offshore oil industry.

The New Concept

Environmental safety is crucial for the offshore oil industry and necessary to becertified through current international regulations. Assurance of high qualitystandards is achieved by having the entire project, construction and installationby a third party certification body. All subsea operations can be monitored fromonshore.The cost for the installation, operation and maintenance in shallow offshorewaters is not very high, relative to the cost of a new onshore sewage treatmentstation, underground pipe installation and mainly when we also considerenvironmental impact, like in Victoria.

Location Plan

Submerged Barge Treatment System

Sewage flowrate:Figures obtained from the CRD indicate 66,000 cubic metersor 66 Mega Liters from Macaulay and 40,000 cubic meters or40 Mega Liters from the Clover point are discharged throughthe deep sea outfalls daily.This totals 106 Million liters/ day or 4416m³/hr .

Contaminants (From a newspaper):Between tests in 2010 and 2013, the average fecal coliformcount in Victoria's wastewater pipes went from 5.3 and 5.7million bacteria per 100 milliliters of water up to 7.2 and 9.3million bacteria per 100 milliliters of water.For reference: B.C. guidelines peg safe levels at 200 fecalcoliforms per 100 milliliters for recreational beaches, and 14fecal coliforms per 100 milliliters for shellfish harvesting.

From the report “Responsible Sewage Treatment Victoria” RSTV

Preliminary Data

Classic Sewage Treatment Process

All the construction and subsea installation technologies are fully developed and already applied to many offshore facilities

Example of offshore system in operation by others

STATOIL

Sewage treatment stage to be done underwater

Submarine manifold system for aeration

The use of the Venturi and vortex technology in the process, has the advantage of generating high oxidation levels in sewageeffluent which enables the reduction of area of the treatment plant

Submerged Barge with tanks for Denitrification and Nitrification treatment to be installed in specific quantities all along the offshore discharge system.

Air inletAir inlet Buoy system

Sea level

Submerged Barge Tanks To the Secondary Treatment improvement

To open sea

Treated waterSewage Water

Seabed

Barge Tank for aeration

From stage 1

Pumping RoomUV Room

Living quarters and main control room

The technology that enables high oxidation effluent also makes possible to build a compact process plant.Based on this argument a viable process operation

can be achieved within the subsea installationin accordance with the concept below.

How can the subsea application be made possible

Structural Treatment Tank Layout

Ultra Violet treatment unit

Overflow piping system Mud piping system

Transformer Room3MW - 13.8 KV –380 V

Pumps and UV Electrical Panel Control Room– 380 V

Out

Automation and Remote Control Room

Tank vent system Tank vent system

First level Equipment Layout

Manifold Vortex and Venturi Unitfor Aeration/oxidation

In

Pump Room Treatment tankTreatment tank

Mud treatment unit

Cross Section

First level treatment area

Mud suction system

Pump Room Treatment tankTreatment tank

Mud treatment unit

First level treatment area

Mud suction system

BSWMS(Ballast and Sewage Water Management System) Similar process is applied to the modern ballast systems

Additional Secondary Treatment SystemAfter appropriate studies are completed and appropriate level of contaminants removal is established, if necessary, complementary barges can be sunk into the sea to work to complement the sewage treatment. These barges/tanks will work with a ballast system to rise and sink in accordance with the needs for maintenance and system operation.

Specific pipeline can send the treated “solids” and “mud” to be treated onshore or in a connection to process module on the barge main deck.

Barge Main Deck:Submarine manifold module can be installed on the main deck to improve the oxidation process

Installation Details

Existing Pumping station

Shore line

Barge New outfalls pipeline

Existing outfalls

On shore by-pass to be built

new

Alternative engineering studies to drill the outfalls pipeline Special gasket and reinforcement device for hot tapping of existing outfalls pipeline

To be developed according to the actual outfalls pipeline piping structure

Possible cycles to improve aeration and/or Secondary Treatment

Cycle 1(Manifold system)

Cycle 2(Sunk barge tanks)

Main flow of the sewage outfall

Disinfectant gasesor Chemicals Injection

Alternative 2

Venturi systemMain Water Flow by pump

Secondary Flow

Surface Air injectionwith Venturi System

Underwater manifold

For the sewage flow rate of 4400m³/hr, we are considering a pumping system with 32 pumps of similar capacity to the one described below.

This will provide spare flow capacity by doubling the total capacity close to 8000m³/Hr.

Facility sewage flow rate and spare for maintenance program

Suspension and solid clean up process

Hi SEA technology

Similar visual aspects for the UV room

Alternative device for UV Disinfection supplier

UV treatment unit

Los Angeles Ultraviolet disinfection room

Pumping Room

Submarine Manifolds for air injection using high technology Venturi can be installed in specific quantities all along the offshore discharge system.

Air inletAir inlet Buoy system

Sea level

1MW Ozone Generator

sewage water

To the open sea

Treated waterSewage Water

Esquimalt and Clover Point Areas

Ozone injection

Alternative Schematic System for the Outfalls Upgrade

Alternative Technology for Ozone Application

Tsunami Hazard

Extracted from NSEMO tsunami report

Project Finance conditions can be provided.Necessary a Letter of Intent to develop the project finance to be presented.

Submarine Sewage Master Basic Plan Months

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

ActivitiesSea bed topography and researchFEED developmentDocumentation for BIDLicensesBID and contract signatureBarge procurementEPC for BargeEPC for ModulesMain deck IntegrationBarge transport for location and installationNew outfalls EPCSubmarine barge and pipeline integration servicesCommissioning and pre-operation

END