Biological Waste Water Treatment Plant
Type: Technologies
Creation: 2014-01-16 11:05 Updated: 2019-06-05 10:19
Compilers: Sabita Aryal
Reviewers: David Streiff, Alexandra Gavilano
Country/ region/ locations where the Technology has been applied and which are covered by this assessment
- Country: Nepal
- Region/ State/ Province: Dhulikhel
- Further specification of location (e.g. municipality, town, etc.), if relevant: Kavre
- Map: View Map
Description of the SLM Technology
Short description of the Technology
The technology adopted is a treatment plant that treats and purifies waste water being discharged from the hospital biologically.
Detailed description of the Technology
It is located in Dhulikhel Hospital premises, Kavre. This treatment plant purifies the waste water being discharged from the hospital biologically on a daily basis.
Biological action takes place in the horizontal and vertical reed bed with the help of bacteria present in the root nodules of Reed plant. The Reed plant helps in spreading the oxygen through its roots. Anaerobic decomposition takes place with the help of oxygen which is spread by the roots.
Purpose of the Technology: The main purpose of this plant is to make the water less toxic so that it does not pose any danger to the human health. It is a biological process in which the Reed plant treats the waste water coming from the hospital.
Establishment / maintenance activities and inputs: Dhulikhel Hospital Constructed Wetland (DHCW) was commissioned in July 1997. The design of DHCW was designed for an average waste water volume of 10m3/ day. But at present, the waste water production is in the range of 75m3/day. Recently, it has been expanded and designed to treat the waste water volume up to 90m3/day.
The plant is maintained by the specialists themselves and the investors are the hospital owners. The task of planning, design, drawing and estimates for the expansion was undertaken by ENPHO (Environment and Public Health Organization ) in association with WATSAN (Water and Sanitation) solution.
Natural / human environment: The treatment plant needs gravel for filtration in horizontal flow bed where the reed bed plant is planted. In addition, sand is required for filtration in vertical flow bed. A slight slope is maintained for the water to flow in one direction.
Photos of the Technology
- 📍 Dhulikhel, Kavre
- 📷 Kripa Thapa
