Bear Valley Ventures
The Tiger Toilet is a pour-flush pit latrine toilet that uses vermifiltration to treat waste.
The Tiger Toilet sanitation technology consists of a bathroom superstructure and a pit-biodigester employing vermifilration technology. The vermifiltration technology uses earthworms to decompose the waste from latrines rapidly into vermi-compost, while liquids drain out of the system. The Tiger Toilet is currently being developed and sold by EaSol Pvt Ltd.
Locally manufactured vermicimposting toilets.
Goal 6: Clean water and sanitation
Target users include households in rural communities, households in peri-urban areas, and people living in displaced-person camps.
The Tiger Toilet superstructures are constructed with concrete using a designed cast. The vermifiltration technology, consisting of tiger worms, bedding material and drainage material, are installed into a excavated pit (sized for the population of users). All materials can be sourced locally by the manufacturer and the users.
The manufacturer currently sells and installs Tiger Toilets across India in addition to providing support to monitor performance every 3-4 months.
Over 4500 toilets have been distributed by TBF Environmental Solutions.
Type of toilet
Method of evacuation
How the fecal sludge is stored
The holding volume of the containment
Time until emptying is estimated to be needed
The Tiger Toilet system was designed to counter the problem of latrine filling through vermifiltration. This passive process degrades and recycles waste by integrating composting worms, bedding materials, and a drainage layer into a pit latrine. In this design, vermifiltration has resulted in 100% degredation of faecal solids, leaving 15% of the waste weight remaining in the pit in the form of vermi-compost. The optimal design produced with the Tiger Toilet results in an average COD removal of 87% and a 99% reduction in pathogens.
The schematic of the biodigester unit is given below and details the layers and material flow direction of the pit and the waste materials.
Provided by the manufacturer.
Replacement components for the toilet superstructure can be sourced locally. The biodigester pit does not include any moving parts thus minimizing the need for replacement components.
The pit of a Tiger Toilet can operate for five years without requiring emptying.
The tiger toilet aims to reduce construction cost, eliminate energy input required for the self-regulating digestion ecosystem, and provide safer user operation because the handling of sludge is not required. There is less maintenance than traditional pit latrine, and no need to connect to a central sewer system.
The technology utilized in this product was shown to be feasible and that the presence of worms increased the faecal reduction rate. Testing by Bear Valley Ventures has found that the worm-based digester can allow for household-scale pits to operate for five years without needing to be emptied because worms reduce solids by over 80%.
The Tiger Toilet system was designed to enable the safe removal of vermi-compost and to prevent the handling of undigested waste by humans. To ensure safety, users must be instructed to not handle the undigested waste immediately after it is deposited into the pit.
The Tiger Toilet is mainly sold as both the toilet superstructure and the biodigester; however the vermifitration biodigester technology can be purchased independently and coupled with existing toilet technology and superstructures.
Furlong, C. et. al., 2015, The development of an onsite sanitation system based on vermifiltration: the ‘Tiger Toilet’. Journal of Water, Sanitation & Hygiene for Development, 5 (4), pp. 608–613.
Furlong, C. et. al., 2014, The Tiger Toilet: From Concept to Reality. IWA specialist conference on Municipal Water Management and Sanitation in Developing Countries.
This paper discusses general information about vermifiltration:
Furlong, C. et. al.,2014 Processing of human faeces by wet term filtration for improved on-site sanitation. Journal of Water, Sanitation & Hygiene for Development, 4(2), pp. 231.
In context photographs (0)
You can use the form below to contribute a photo of this product.
In context files & documents (0)
Feedback from users, customers & distributors
Please let us know your experience in using this product through comments below.