Does anyone have any experience with in-line chlorinators such as the below product? If so, do you have any lessons learnt/ other recommendations for similar products? We are looking at using them for a project in Ethiopia for dosing gravity-fed water systems. I would also be interested in any recommendations for dosing water directly from a handpump.
I have used these for chlorination of water in Haiti that was reasonably successful although did have some issues with spares and one specialist part that was needed that had been discarded in error.
Reasonably successful but points to watch out for are that there is a minimum pressure required for operation and that may be an issue in your gravity fed system. Also the operation at a trickle flow is not good and so you would need to ensure that there was a certain flow or no flow to get better results.
The other thing is that the sustained operation will depend on having a supply of spares and a reasonably skilled person to maintain the system.
Similar to all hypochlorite injection systems there will be scaling issues in hard water areas which will increase the maintenance requirement.
The dosing is reasonably flow proportional but there is no control of the actual residual and so the residual achieved will vary depending on the solution strength and this may vary as batches are made up and because of thermal decay of hypochlorite.
Thank you for your response. It's useful to get some lessons learnt. Spare parts chains and complexity of O&M are my biggest concerns with this product.
I've since found out that the makers of Aquatabs have now developed two products to install onto the inlet to a tank or in-line, called the Aqua Flo and and Aqua Inline which are much cheaper than the Dosatron or similar devices, but still seem to provide a constant FRC in the water at the point of collection. I don't suppose you have any experience in these as well?
we have some dosatron system here in Bangladesh, they are pretty expensive and the spare part issue was already mentionned. The main problem we found is sand, coming through the sieve into the pump and blocking it. Here a frequently maintenance and cleaning might be needed.
Furthermore we are using TEKNA dosing pumps. That comes with a solar panel, charge controler and battery. To trigger the pump you would need a flow meter with a triger cable that triggers chlorine solution injection every e.g. 100l.
Best regards, Andreas*
You do need to think about sustainability as well as technical effectiveness.
Is an interesting paper that’s worth reading.
Don’t forget about the whole treatment chain - safe storage is essential if the chlorine is going to make much of a difference.
Hi Martin, I've recently been made aware of an automatic chlorinator for community water supplies called ZIMBA, that is manufactured in India, www.zimbawater.com. It has been used in some WaterAid projects in India, but I don't have any feedback on its performance. The manufacturer states that it works without electricity, has no moving parts, weighs around 11 kg and can be easily transported, and installed to a community water source in 30 minutes requiring no special tools, it is capable of chlorinating water at the rate of 15 litres per minute and being community scaled, is more cost effective than domestic water disinfecting systems. These units have been installed, and are operational, in several countries including India, Bangladesh, Kenya and Dominican Republic - in projects run by various NGOs and research organisations including UNICEF, WaterAid, EAWAG, Switzerland, ICDDR, Bangladesh and The Hope Foundation. It has also been used in disaster situations like the Nepal earthquake and Rohingya Refugee crisis. The unit costs around 300 US dollars excluding shipping. Have a look at their website and see what you think. Frank Lawson
This thread is public, all members of KnowledgePoint can read this page.