Closed loop model for a water supply axel 7

PowerPoint Presentation

Closed loop model for a water supply and water treatment system in the HQ of INA in Costa Rica (San Jose)

Initial situation

Dipl.-Ing. Axel M. Haase / Aquamark & Education Consultants AMECs Ltda.

The cost in 2014 (only potable water supply) were around 74 Mio. Colones. Extrapolated app 140.000 US$/a. The water price is variable between 1600 and 1900 Colones/m (today max. 3,65 $/m). That is corresponding with 0,37 $ cent/Liter.


Approach to solving the problem (Ultimate objective for large scale size):

Additional cost for the AyA waste water grid connection could increase the price up to 6 US$/m plus connecting cost and pipeline building

Decoupling of rain and waste water channels and pipes during the reconstruction phaseConnection of roof ages in a rain water collection and usage gritUsing of the existing waste water buffer tank (160m) and build up a constructed wetland (ca. 2.500m) and possible parallel use for a large organic vegetable productionBuild up an UF plant for drinking water (quality) in the area of Granja Modelo and use in all the INA area.Build of a rain water plant with cascading buffers system, main buffer including Ultra Filtration and Reverse Osmosis Plant (depend of the quality of the spring water and required drinking water quality)

ImpactAn semi - autarkic pilot plant will be installed, constructed and used in INAOperation by trained specialists independent of INAUp to 250.000 Liter of purified wastewater can be used daily3.000 people daily could be supported with guaranteed water qualityNo pollution anymore

Benefits

INA is a water semi - self supplier Independent of additional cost of AyA (waste water grid connection)Independent of rising prices of AyA and inflation Less cost of INA depend of planned reconstructionThe sustain use of the own spring Guarantee of constant water qualityAvoiding of contamination of Rio VirillaExample, demonstration and pilot plant of INA for environment protectionContribution for ISO 14001 certification


BenefitsCalculability of cost through an operator modelReduction of water prices and cost over yearsAdditional organic plant production for the local marketSustainable training school for instruction curse for technicians in the INA HQ area Transferability to other INA places and country wideUsable as information, demonstration and training center for technicians, universities, government and public interested individualsThrough further investment also an energy autarkic water supply is possible


Approach to solving the problem


Plan A


Plan A in detail


Smaller scale in training, education & evaluation size

The main difference to the large scale version with a proposed closed loop model for the complete INA area (Blue shaded) is the downsized area for training, education and evaluation purposes (Proof of concept).

The main objective here is to train the students, technicians, trainers and other interested people in the theory and practice an on rainwater use, constructed wetland, ultra filtration, reverse osmosis and the technical, financial and operational principles of a closed loop model.


Water saving

One of the easiest, fastest and cheapest ways to increase efficiencies of integrated water management is to reduce the required amount of water in the overall system. Old water taps, now water saving toilet flushing, shower heads without flow restrictors, leaking pipes etc. are one of the biggest contributors of excess water use. We would want to analyze with the students the exact water consumption prior to project implementation and discuss and show different opportunities of water saving measures without jeopardizing the comfort level. Obviously during and after the project has finished we would do the same analytic exercise giving us valuable data for the planned large scale water management system at the whole INA compound.


Rain water

This available area will be used for rainwater harvesting to deliver relative clean rain water into newly built rain water collection tanks. Looking at available rain water statistics we expect plenty and heavy rain (monsoon type raining patterns) during different periods.

During rainy season and depending on (storage) efficiencies outside the rainy season, this water will become the primary source of raw water for this buildings.


Rain water collection

The current is providing ample rain water collection surface. Rain water is not collected, instead it creates problems such as floods, erosion and is contributing unnecessary hydraulic load (rain water and waste water stream are not separated) towards the undersized and fractured waste water system.


Well waterDirectly located at our demonstration area is an existing well. On top of the well is a pump house holding the pump and the controls.

Currently the well and the pump is not in use due to technical problems. However, in the past it has delivered sufficient quantity of sweet water to the existing water distribution line into the INA buildings.

A detailed water analysis of the water remains to be done in order to evaluate its current quality level and the required purification stage for drinking water purpose


Well water and buffer tank

The raw water buffer tank made out of concrete is on the right side in the above picture. Currently the water tank can be filled either by the well water or grid water supplied by the public water utility. In the future, this tank will be filled by collected rain water (Priority 1), well water (Priority 2 and depending on result of water analysis) and once the well pump has been repaired / replaced and public water (Priority 3) supplied by the public utility (AIA).


Water purificationThe right picture shows the existing raw water buffer tank (left), the pump house (center) pumping raw water into water distribution tank (foundation on the far right in the above picture) and the filtration house (in between pump house and distribution tank).In the future we would like to install in this filter house a modern, small Ultrafiltration / Reverse Osmosis water treatment unit for training, demonstration and evaluation purposes.


Revers osmosis

DOW FILMTEC XFRLE 400/34 element embodies Dow s latest innovations in treatment of challenging waters with high biological and organic fouling tendencies such as municipal or industrial wastewater or challenging surface water:- Proven fouling resistance chemistry of the DOW FILMTEC BW30XFR- 400/34i operating at over 30% lower pressure Large 34 -mil spacer optimized for pressure drop minimization reducing the impact of fouling and enhancing the cleaning efficiency Wide chemical tolerance allowing effective and efficient cleaning of biofilms, organic compounds and scale at cleaning pH from 1 to 13 high rejection of special solutes such as Nitrate, Ammonium or Silica High integrity achieved with proprietary I LEC technology (interlocking end-caps), minimizing the risk of o- ring leaks that can contribute to poor water quality

Spiral Wound Reverse Osmosis Elements


Membrane Filtration


Water distribution according WHO standard

By utilizing the existing water distribution tank we can ensure safe and sufficient drinking water distribution (incl. water sampling) into the existing distribution network.Depending on available budget and interest of teaching & learning we can also install a smaller sized Photovoltaic system contributing clean energy towards the integrated water management system.


Waste water purification

At the side area of the existing building is plenty of unused space under the existing trees. Here we would want to design and implement with the students a small sized constructed wetland purifying mixed household type waste water. That waste water can be collected and pretreated (3 chamber system) tapping into the already existing waste water stream.


Waste water treatment

The purified water leaving the wetland is already clean enough for irrigation purposes, thereby reducing the demand of drinking water quality water. Since we expect the wetland to produce 24/7 cleaned waste water we would further polish this recycled water by using ultrafiltration technology installed at the filter house. The clean water leaving the Ultrafiltration can be used for any hygienically safe water application such as toilet flushing, hand wash or other washing purposes other than drinking water purposes.


Training and education

If we are looking at the above involved technologies we can identify the following core technologies usedWater saving technologiesRain water harvesting Membrane based water filtration (potable water, waste water, sea water desalination)Constructed wetlands (with and without pumps)Stand-alone systems (energy autarkic systems)In all of those technology areas German technologies and German small and medium enterprises are well positioned worldwide. On the Costa Rica side those technologies and expertise is neither hardly known nor readily available.


Plan B


Rain and Waste water supply


Construction side almacen


Pump house Industria Plastico


Almacen


Rough calculation with develoPPP Demo/Training site


Thanks for your attention

Dipl.-Ing. Axel M. Haase / Aquamark & Education Consultants AMECs Ltda.For more information click [email protected]+506 6227 5227 or+49 172 8808 300https://www.facebook.com/aquamarkcr/

Technology

Closed loop model for a water supply axel 7