Carbon footprint

Carbon footprint

showcase2A carbon footprint assessment enables a company to determine its status quo and implement a successful carbon reduction program. A regular calculation of the carbon footprint allows for monitoring of the effects of the program. It is the intent of EWS to adopt best practices in carbon footprint assessments and reduction programs within the Southern African context. The methodologies and experiences developed by Vitens-Evides International in conjunction EWS can be used by peer utilities for their own benefit.

2explorationpdfCoE showcase 2 - Carbon footprint

Background

The production and distribution of water as well as the collection and treatment of waste water is an essential aspect of our daily life. These activities involve the use of electricity, chemicals and other natural resources. Investigating this impact in a carbon footprint allows a water utility to prioritize initiatives to reduce its impact on the environment. eThekwini Water and Sanitation has initiated a number of projects to reduce its impact on the environment with a specific focus on energy reduction. Some of these initiatives are also showcases within the Centre of Expertise.

Status & Feedback

The showcase has been concluded in 2013.

Location

Contact

Dhevan Govender

Senior Manager: Commercial and Business

eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8689

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Results

Calculation model; guideline on how to calculate the carbon footprint

Training

A training on how to calculate the carbon footprint within the water and sanitation sector is available. Please contact Dhevan Govender (see contact) for more details.

All training will be offered by dedicated training institutes later this year.

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More information from your data

More information from your data

I2MTS Dashboard Picture  headerThe I2MTS (Integrated Innovating Maintenance Technologies & Solution) showcase, as applicable to the water supply and waste water infra elements of EWS, deals with the issue on how to maximise available data to optimize management/engineering decision making, improving operational efficiency, reducing non-revenue losses, and meeting regulatory compliances.

The ultimate aim is to assist EWS to provide clean and safe water to the local communities. This will be done through the introduction of a management dashboard that provides a hierarchical structured, KPI enabled, real-time, management information environment that runs on virtual servers within the EWS IT infrastructure.

The dashboard can be accessed anywhere in the world using remote desktop and VPN, and issues emails following alarmed situations, allowing key management and engineering staff to elicit timely responses. The dashboard allows any type of data to be interfaced and shows raw and refined data.2exploration


Background

Municipalities are required by law to deliver clean and safe water to local communities and to do this in the most cost effective manner (as they are using funding supplied by taxpayers).

Managers and engineers are using data from various sources to help them to make correct decisions and to react on alarmed situations. Some of the data sources are used for process control activities and includes SCADA type systems to control the waste water purification systems and to monitor custody transfer pricing for water purchases from neighboring municipalities.

A management dashboard aims to combine all available data sources within a single environment, and to present the data in a manner that will allow managers and engineers to view the status of their assets in real time, and to receive automated warnings in case of alarmed situations. This includes data used within SCADA control processes, however, it excludes any active process control.

Technology

The technology demonstrated involves the integration of available datasets into a virtual management information environment allowing for the data to be presented in raw/refined format and suitably alarmed through various types of limits.

Typical datasets includes; flow, volume, pressure, sales volumes, bursts/leakages (locations, types, etc.), current operating capacities, removal efficiencies, dissolved oxygen levels, regulatory compliances, maintenance status, and asset status.

The technology demonstrated also includes generating models to predict non-revenue losses using data from the available datasets. The asset status includes compliance to PAS 55 requirements.

Status & Feedback

The showcase is nearing its 90% completion status with a full demo on 15 May 2014.

Following this demo the dashboard will be optimized for a couple of months and presented to EWS by end August 2014.

Location

For the showcase the management dashboard includes the EWS DMA – Durban CBD and 16 Custody Transfer Points within the water supply side, and the Northern Works Sanitation Plant Liquid Treatment Process within the waste water side.

Contact

Simon Scruton Pr. Eng. MSc. Eng (Civil) MSAICE

Senior Manager: Non-Revenue Water Branch eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8744

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The management dashboard is developed by VEC Engineering Consultancy BV (VEC, Leiderdorp, Netherlands) with the maintenance and asset status inputs developed by IMS International BV (IMS, Tilburg, Netherlands).

Andries Vermaak

VEC Engineering Consultancy BV (www.vec-ec.nl)

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Results

After the 90% completion demo (15 June 2014) the City of Cape Town Metropolitan Municipality, City of Johannesburg Metropolitan Municipality, and the Nelson Mandela Bay Metropolitan Municipality (Port Elizabeth) will be given full access to the dashboard in order to “look over the shoulder of EWS” how the dashboard is developing until the completion of the showcase. This allows ample opportunity for these metropolitan municipalities to show concrete interest to also acquire the dashboard.

The dashboard also now includes sale volume data for the 16 Custody Transfer Points and the DMA – Durban CBD, allowing for potential losses within the overall system to become more visible.

Training

EWS staff will be trained to use the dashboard during the optimization period (Jun to Aug 2014).

Please contact Simon Scruton (see contact) for more details.

All training will be offered by dedicated training institutes later this year.

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UV disinfection of Waste Water effluent

UV disinfection of Waste Water effluent

uv largeAt many waste water treatment works, the last treatment step in the process is disinfection, where the amount of bacteria present in the effluent is reduced to levels required by legislation.

In this showcase, the application of closed vessel, medium pressure UV technology is demonstrated at a waste water plant which is suitable to compare traditional chlorination with UV technology.

The aim of the showcase is to demonstrate the suitability of modern UV disinfection technology.

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Background

In South Africa traditionally chlorine is used for the disinfection of municipal waste water, which is associated with many disadvantages. The benefits of the application of UV over chlorination are worldwide increasingly recognised and can be explained as follows: UV disinfection does not result in the production of disinfection byproducts, which improves the water quality in the river system where the effluent is discharged into.

Closed vessel UV technology is not associated with any health and safety aspects for operators, compared to the big risks for operators having to work with (gas) chlorine dosing systems.

UV disinfection systems are very robust and reliable and the disinfection is not dependent on the supply and/or availability of chlorine. UV kills also chlorine resistant pathogens, such as Cryptosoridium and Giardia.

Technology

UV-halmarThe application of ultra violet (UV) light technology systems, is found in drinkwater disinfection, waste water disinfection and water re-use.

In this showcase, the application of closed vessel, medium pressure UV technology is demonstrated at a waste water plant which is suitable to compare traditional chlorination with UV technology.

Status & Feedback

The showcase is expected to start in the second half of 2014.

Location

Amanzimtoti Waste water treatment works, KZN, eThekwini Water and Sanitation.

Contact

Dhevan Govender

Senior Manager: Commercial and Business

eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8689

This email address is being protected from spambots. You need JavaScript enabled to view it.

Results

The aim of the showcase is to demonstrate the suitability of modern UV disinfection technology.

Supporting this goal are the following activities;

  • Training of local operators on site.
  • Testing and validation of the UV system based on the microbiological results of the influent and effluent of the UV system, with a special focus on Cryposporidium and Giardia.
  • Presentation and sharing of results with the client and relevant metro cities in South Africa.

Training

Training is anticipated to be available early 2015.

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Thermophile sludge digestion

Thermophile sludge digestion

anaerobic digester_diagramThe principle of this showcase is to explore the yields of thermophillic digestion of sludge from a waste water treatment plant, the operational effects and integration into an existing process.

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Background

The WWTP in Phoenix, KZN, operates at mesophilic sludge digestion installation on site and is facing increasing energy and sludge handling costs.

eThekwini Water and Sanitation therefore could benefit from the benefits of application of thermophilic sludge digestion and eventually to turn the current mesophilic sludge digestion process into a thermophilic sludge digestion process.

Technology

Sewage plantThe digestion of sludge and reclaiming of energy is common practice in the Netherlands.

Colsen International b.v. has developed optimal thermophilic digestion methodology that could benefit the South-African water boards during water treatment in current installations and allow them to operate these in an environmental and economic neutral mode.

After the proof of concept is delivered (a pilot project) this might result in a great opportunity to refurbish the current installation to a full scale thermophilic digestion plant after success of the pilot project.

A successful technology demonstration at the pilot location could serve as an excellent show case for further implementation in South-Africa and other Africa areas with similar climatologic and environmental/economic conditions.

Status & Feedback

The showcase is expected to start in the second half of 2014.

Location

Phoenix waste water treatment works, eThekwini Water and Sanitation department, Durban.

Contact

Dhevan Govender

Senior Manager: Commercial and Business

eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8689

This email address is being protected from spambots. You need JavaScript enabled to view it.

Results

The aim of this showcase is to demonstrate the yields of thermophillic digestion on primary and waste activated sludge and its operational aspects.

A business model is envisaged for the conversion of current mesophillic digesters to thermophillic digesters.

Furthermore, the technology impact is addressed on the volumes and quality of digestate and effects on the effluent quality of the waste water treatment plant.

Training

Training is anticipated to be available early 2015.

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Phosphate recovery in effluent

Phosphate recovery in effluent

Phosphate recoveryIn this showcase, the recovery of nutrients (struvite) is demonstrated from the liquid fraction after the belt press at Northern Works WWTW.

The operational aspects of a Nutrient recovery installation are documented and the influence of phosphorous removal at the effluent of the belt press on the final effluent quality is investigated.

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Background

The application of Struvite precipitation technology on anaerobic effluent from the belt press reduces the phosphorous concentration in the final effluent at Northern Works.

In addition, it allows the municipality to recover valuable nutrients from its waste water and sell them as a fertilizer.

Technology

The liquid fraction of the belt press contains a high amount of ammonia and phosphorous.

Colsen International has developed a batch wise process to decrease the phosphorous concentration in the anaerobic effluent from the belt press: ANPHOS®. The phosphates are recovered in the form of struvite crystals ((MgNH4PO4.6H2O or MgKPO4.6H2O). This crystal can be sold as a fertilizer. The treated effluent will be drained from the ANPHOS® reaction tank and will be fed into the main line of the waste water treatment works.

Status & Feedback

The showcase is expected to start in the second half of 2014.

Location

Northern Waste water treatment works, KZN, eThekwini Water and Sanitation.

Contact

Dhevan Govender

Senior Manager: Commercial and Business

eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8689

This email address is being protected from spambots. You need JavaScript enabled to view it.

Results

The aim of this showcase is to demonstrate the Struvite precipitation technology on a municipal waste water treatment works in South Africa.and the operational aspects of Nutrient recovery installation.

Furthermore, the influence of phosphorous removal at the effluent of the belt press on the final effluent quality is documented.

Training

Training is anticipated to be available early 2015.

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Coating of water pipes and fittings

Coating of water pipes and fittings

pipe insideThe main objective of this project is to showcase a new technology to the water industry, for the coating of water pipes and fittings.

The coating will greatly improve corrosion protection and subsequent longevity of coated pipe network, in an economical manner.

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Background

With the proposed technology, the water authority will stand to maximise the expected lifespan of the water distribution network by ensuring that water pipes and fittings are given the best possible corrosion protection, with excellent adhesion to the metal without the need for a primer.

The water authority can also be safe in the knowledge that the coating does not leach any harmful chemicals in the water or the surrounding environment.

Technology

PPA 571 Aqua is a thermoplastic material. Contrary to Fusion Bonded Epoxy or any other thermoset material, PPA 571 thermoplastic coatings do not polymerize, they only fuse and bond to the metal when heated up. Thermoplastic materials are intrinsically very flexible and elastic, which confers very good impact and abrasion resistance to the coating.

Because the material does not need to polymerize, there is no risk of incomplete curing, which can often happen with FBE, leading to an impairment of the physical properties and resulting performances. PPA 571 Aqua can also be repaired using the same material: Plascoat supplies strands of PPA 571 material to allow repair of the coating in case any imperfection or defect arise during the coating process. PPA 571 Aqua also presents other advantages compared to Epoxy: they are fully UV resistant and Bisphenol A free.

In South Africa, Polyamide (Nylon) powder coating are quite popular, it has been widely specified by the Water Companies and just like PPA 571 Aqua, is based on thermoplastic technology.

However, PPA 571 Aqua differs from Nylon in the fact that it does not require the application of a primer to activate adhesion between the coating and the metal. This allows manufacturers to eliminate one production step, therefore saving on processing cost.

From a commercial point of view, PPA 571 Aqua is much more economical to use compared to Nylon. Nylon, FBE, sleeve, galvanised steel and bitumen are all used to coat the outside of Water Pipes and Fittings and PPA 571 Aqua presents numerous advantages against all these systems.

Status & Feedback

The showcase is expected to start in the second half of 2014.

Location

Contact

Simon Scruton Pr. Eng. MSc. Eng (Civil) MSAICE

Senior Manager: Non-Revenue Water Branch eThekwini Water and Sanitation

Tel: +27 (0) 31 311 8744

This email address is being protected from spambots. You need JavaScript enabled to view it.

Results

Preliminary results of the showcase will be based on application trials results: can the coating be applied easily by the coater, and does it give the expected level of performance: adhesion, integrity, thickness control + any other long term performance testing that the water authority may want to have performed.

Training

Training is anticipated to be available early 2015.

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