The picture below illustrates an overview of a Drinking water treatment facility which Express Drainage Solutions Kenya Limited can design, supply and construct.
Express Drainage Solutions Kenya Limited are capable of designing, supplying and constructing Large drinking water treatment facilities which can draw water from the source either by gravity flow or pumps. The water flows through intake tunnels into a distribution chamber in each plant’s raw water building. Other vertical pumps which we can install draw the water through a series of traveling screens, which prevent large debris, such as fish and seaweed, from entering the system. It is then pumped to the main treatment plant to begin the treatment process.
Express Drainage Solutions Kenya Limited systems always ensure that the water flows through rapid mixers where polyaluminum chloride is added. The chemical reaction causes dirt, clay, and bacteria to form a product known as floc in a process called flocculation, which settles easily out of water. In flocculation basins, large paddles gently stir the water causing the floc to increase in size and density helping it to settle at the bottom of the basin.
Express Drainage Solutions Kenya Limited design, supply and construction also ensure that the water flows to settling basins. The sludge at the bottom of the basin is removed by scrapers and sent to the waste water system. The partially treated water flows to the filter beds. Chlorine is added to the water for disinfection. The water flows through layers of sand, gravel, and anthracite coal. The filters remove particles, such as viruses, cysts, bacteria and any remaining floc.
Filters are cleaned by backwashing, in which clean water removes the collected sludge from the top of the filter to settling clarifiers. When the backwash water settles, the clear water is recycled back into the water treatment process and the sludge is removed. The picture below illustrates a municipal drinking water treatment plant.
Before water enters the distribution system, more chlorine is added to prevent bacteria build up. Fluoride is also added to fight tooth decay. Caustic soda is added to neutralize the acidity and prevent the corrosion of pipes. Finally, high service pumps push the treated water from a clear well reservoir into the distribution system.
Water is sampled and tested throughout the treatment plant to make sure that treatment processes are working and that the water is safe before it leaves the plant. We collaborate with world renown and ISO registered laboratories for all our water testing services.
The picture below illustrates Borehole submersible chlorine-sack drinking water treatment process which Express Drainage Solutions Kenya Limited can design, supply and install in a borehole or well for domestic or small community use.
The immersed sack containing chlorine releases chlorine continuously into the water causing water purification process at the Point of Source (P.O.S). This same process is the one we also use in wells. We have a team of professionals who are ardent, passionate and enthusiastic in attending to our clients needs pertaining to water purification in Boreholes and Wells.
The picture below illustrates the process of cleaning and disinfecting boreholes which Express Drainage Solutions Kenya Limited can design, supply and install;
Express Drainage Solutions Kenya Limited undertakes the following when carrying out maintenance, repair, cleaning and disinfecting boreholes; a clogged borehole due to silt yield less water than is expected.
- Flush the sediment from the borehole. We apply a method called Jetting which is illustrated in the diagram above. Express Drainage Solutions Kenya Limited pumps highly pressurized clean water into the borehole to remove any debris inside the borehole and especially silt. The overflowing water which comes out of the bore hole carries the debris and one can inspect to ensure that the process is complete when no more debris comes out. After Jetting we apply disinfection through chlorination. The chlorine compound we most commonly use is high-strength calcium hypochlorite (HSCH) in powder or granular form which contains 60 to 80% available chlorine. Sodium hypochlorite in liquid bleach form is also used but this only contains about 5% available chlorine. Express Drainage Solutions Kenya Limited have devised a certain formula to calculate the amount of chlorine needed for this purpose.
- This method is also useful after earthquakes when borehole water becomes easily contaminated more so at the underground where the damage is most profuse.