Coco-logs are created using coconut coir fiber and placed along river banks and lakes for soil erosion control, water treatment and stabilization. They are normally kept at the edge of river banks where they work as wave-breakers, reducing the impact of erosion.
Coconut coir is a hard, biodegradable and organic fiber. Its tensile strength helps protect steep surfaces from heavy flows and debris movement.
COCO LOGS :
As depicted in the picture below, the coconut coir fibers are compressed in a tubular coir mesh netting known as a cocolog.
Each coco log is reusable and can be used for more than a year. Once the coir of the log starts decaying, it is removed and used as a mulching mat for plantation, thus adding nutrition to the soil due to its biodegradable nature.
Mining discharge after proper treatment with lime and flocculent in settling ponds is allowed to pass through a bed of coco logs. These logs capture the silt and discharge it as clean water.
Since 2004, Fomento Resources have been using coco logs at their locations specifically for the treatment of water. The ability to trap soil particles or control the movement of debris is utilized in waste water treatment.
A bed of three coco-logs is supported by metal pegs and placed in the path before the final settling pond. The application of this bed reduces the water turbidity by 25 NTU units.
Cocolog used to arrest silt from the mine discharge
A series of settling ponds are constructed to divert and treat all mine runoffs. These walls of settlings ponds are lined with cocologs to arrest fine silt and discharge only clean water.
Walls of the settling ponds lined with coco-filter/logs
Series of silt arrestors lined with Coco filter