Modern Technologies in Rainwater Harvesting. Fritz Poerschke, Director R&D - WISY AG Germany

Transcription

1 Modern Technologies in Rainwater Harvesting Fritz Poerschke, Director R&D - WISY AG Germany

2 THE MAGIC OF H2O

3 Rain All Sweetwater has once been Rain

4 Rainwater Harvesting Is A Part Of Water Management Solutions o Storage of rainwater for utilization in a vessel instead of direct infiltration into the groundwater o o o Advantages of RWH Merging modern and indigenious technologies in rural areas Creating awareness and carry RWH to more popularity a need is: to create jobs to create responsibility to include women in decision making processes about water issues

5 How Does Modern Rainwater Harvesting Work? 1. Collection 2. Filtration 3. Storage 4. Extraction 5. Utilisation

6 Design & Construction Details Of Modern o Learnig from History Rain Water Harvesting o Four Steps To Ensure The Best Possible Water Quality 1. guidline for best types of filter 2. smooth inlet to ensure interaction between the stored water and the sediments 3. overflow device to burst the surface tension for removing swimming particles 4. floating suction o Storage of Harvested Rainwater in cold, dark and a cleanest possible storage vessel o The discussed four steps are the same: in high tech rwh system in a Mall or a simple rwh system in rural areas.. the difference is only in material and products.

7 Rainwater Harvesting 1. Collection - All rooflike surfaces are perfect. - Water can be collected by gutter and downpipe or by surface water intake in case of flat roofs - Water from roads, gardens, parking lots, are second choice because of possibly a greater amount and diversity of contamination.

8 Rainwater Harvesting 2. Filtration - Rainwater must be filtered before it is stored. - Simple physical filtration is sufficient - The filter removes particles like sand, dust, tile pieces etc. to ensure long life of pumps, sealings, and faucets - The filter removes biological matter leafs, Insects, birdsdrop, rodents, etc. to ensure microbiological stability

9 4. Rainwater Harvesting 2. Why Filtration Is A Microbiological Need? 1. Bacteria are essential for human life! e.g. Coli Bacteria live in symbiosis within the human intestine, without them digestion is not possible. 2. Bacteria cause diseases and foulness Oxygen and the distribution of oxygen in the stored water makes the whole difference Oxygene prevents anaerobian reactions and promotes the life of the aerobian bacteria. They are: Eating Biological matter, using Oxygen, producing Carbondioxide That are the good ones which we whish to have in the stored rainwater!

10 Examples of existing filtration systems Example 1: Sand & Stones Filter

11 Example 2: Filter with a horizontal sieve and rinsing water

12 Example 3: Filter with a inclined sieve

13 Hon. Eng. Norbert Winkler had a genius idea which is working much better: Filtering by ahesion! The principle: water jet is attraced by a solid surface and it changes its velocity, e.g. not only its speed but also its direction changes!

14 The result: WISY filter with a perpendicular sieve! WISY Filter Collector for vertical pipes WISY Vortex Fine Filter for horizontal pipes

15 Rainwater Harvesting 3. Storage Rainwater should be stored in a cool and dark place at best underground Above ground container should prevent sunlight inside the tank. Good protection from the sun is necesary to avoid warming of the water. Big containers can be divided to keep a certain amount of water, for example for use as fire fighting water

16 Rainwater Harvesting 4. Extraction The best method is the use of a submersible pressure pump Extraction by suction pump is possible when special care is taken that the hose stays filled with Water, including a non return valve or automatic filling device. Placing the pump by the side of the tank is possible but has the risk of water loss through the pump or bad sealings

17 WISY Rainwater Harvesting System 4 Steps To Clean And Store Water Step 1: Filtration of Rainwater 1 1 Step 2: 4 Water enters cistern softly and oxygen is distributed evenly 3 2 Step 3: Extraction of water in the cleanest level of the cistern, by floating filters Step 4: Overflow removes floating particles

18 WISY Rainwater Harvesting System Step 1: WISY Vortex Fine Filter - For horizontal pipes Pipe diameter 100 mm Pipe diameter 150 mm - Filtration with 0,28 mm mesh Size - Self cleaning - No energy consumption - Oxygenation of filtered water - Automatic transport of dirt - Three sizes Pipe diameter 300 mm

19 WISY Rainwater Harvesting System WISY Filter Collector - For vertical Downspout Pipes - Filtration with 0,28 mm mesh Size - Self cleaning - No energy consumption - Oxygenation of filtered water - Automatic transport of dirt -

20 WISY Rainwater Harvesting System Step 2 Water Inflow WISY Smoothing Inlet Dispersed Water and oxygen - Distribution of the fresh water In an upward direction - Slows down speed of fresh water - Allows new particles to settle - Keeps old sediment undisturbed Soil sediment - Spreads the oxygen from fresh water in the tank

21 WISY Rainwater Harvesting System Step 3 Floating fine suction filter - For highest functional security of your pump. - For the extraction of rainwater out of cisterns and other storages, ponds and wells from the cleanest part of the tank. - The floating ball is made of ecologically harmless polyethylene, the other components of stainless-steel.

22 WISY Rainwater Harvesting System Step 4 Multisiphon - Multifunctional overflow unit - Made of impact-resistant ABS plastic. - Connects to an overflow pipe. - Removes surface debris. - No drain smells, - Prevents rodents from entering into the tank - Prevents sewage backwash from entering into the tank

23 Rain Harvesting Is Not The Solution Of All Water Problems But There Is NO Solution Without RWH!!! Local and decentralized availability with little demand for Infrastructure Rainfall is independent from political and financial situations Decentralized Rainwater collection reduces fast water runoff Ability of collecting Rain makes us independent from weather extremes Reduction of flooding Rainwater is free of minerals, irrigated soil stays fertile

24 RAINWATER QUALITY TEST REPORTS Result Parameter Unit Panasonic Warehouse Subang Jaya UITM 1 Lagenda National Standard For Drinking Water Quality Test Method Turbidity NTU <5.0 HACH 2100P Colour PtCo/TCU <15 TCU Hardness as CaCO 3 mg/l <500 PHARO 100 METHOD 32 HANNA hardness test kit TDS mg/l TDS Meter Bacteria Presence /Absence test Cfu/ml ND Coliform = 16 ND ND ND (0) 3M TM Petrifilm TM E.coli/Coliform Count Plate ph HANNA ph test pen

25 Saftey and Maintenance easy and reliable water testing quality of rainwater

26 Best Practice Is To Avoid Or Minimize Water Usage... Wherever Possible! some Examples: Water-saving tapware Toilets without water flushing system Using grey water Drip irrigation in agiculture

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