solution finder

solution finder

Urinal

Applicable to

Application level

Not applicable

Management level

Not applicable

Inputs

Flushwater
Urine

Outputs

Urine
+ Flushwater
Author/Compiled by
Eawag (Swiss Federal Institute of Aquatic Science and Technology)
Martin Wafler (seecon international gmbh)
Dorothee Spuhler (seecon international gmbh)
Beat Stauffer (seecon international gmbh)
Executive Summary

A urinal is used only for collecting urine. Urinals are generally for men, although models for women have also been developed. Most urinals use water for flushing, but waterless urinals are becoming increasingly popular.

Advantages
Waterless urinals do not require a constant source of water
Can be built and repaired with locally available materials
Low capital and operating costs
Disadvantages
Problems with odours may occur if not used and maintained correctly
Models for women are not widely available
In Out

Urine, Freshwater

Urine and Yellowwater

Urinals for women consist of raised foot-steps and a sloped channel or catchment area that conducts the urine to a collection technology. For men, urinals can be either vertical wall-mounted units, or squat slabs over which the user squats.

The urinal can be used with or without water and the plumbing can be developed accordingly. If water is used, it is mainly used for cleaning and limiting odours (with a water-seal).


Design Considerations

For water-based urinals, the water use per flush ranges from less than 2 L in current designs to almost 20 L of flushwater in outdated models. Water-saving or waterless technologies should be favoured. To minimize odours and nitrogen loss in simple waterless urinal designs, the collection pipe should be submerged in the urine tank to provide a basic liquid seal.

 

Waterless urinals are available in a range of styles and complexities. Some urinals come equipped with an odour seal that may have a mechanical closure, a membrane, or a sealing liquid.

By putting a small target, or painted fly near the drain, the amount of spraying or splashing can be reduced; this type of user-guidance can help improve the cleanliness of the facility. Because the urinal is exclusively for urine it is important to also provide a toilet to be used for faeces.

Appropriateness

Urinals can be used in homes as well as within publicfacilities. In some cases, the provision of a urinal is useful to prevent the misuse of dry systems (e.g. UDDT).Portable waterless urinals have been developed for use at large festivals, concerts and other gatherings, to improve the sanitation facilities and reduce the point load of wastewater discharged at the site. In this way, a large volume of urine can be collected (and either used or discharged at a more appropriate location or time). The remaining toilets can be reduced in number or used more efficiently.

 

Health Aspects/Acceptance

The urinal is a comfortable and easily accepted user interface. Although simple in construction and design, urinals can have a large impact on the well-being of a community. When men have access to a urinal, they may urinate less often in public, which reduces unwanted odours and makes women feel more comfortable. Men have generally accepted waterless urinals, as they do not call for any change of behaviour.

Operation & Maintenance

Maintenance is simple, but should be done frequently, especially for waterless urinals. All of the surfaces should be cleaned regularly (bowl, slab and wall) to prevent odours and to minimize the formation of stains.

Particularly, in waterless urinals, calcium- and magnesium- based minerals and salts can precipitate and build up in pipes and on surfaces where urine is constantly present. Washing the bowl with a mild acid (e.g., vinegar) and/or hot water can prevent the build-up of mineral deposits and scaling. Stronger (> 24% acetic) acid or a caustic soda solution (2 parts water to 1 part soda) can be used for removing blockages. However, in some cases manual removal may be required.

For waterless urinals, it is critical to regularly check the functioning of the odour seal.


 

Applicability

Urinals can be used in homes as well as within publicfacilities. In some cases, the provision of a urinal is useful to prevent the misuse of dry systems (e.g. UDDT).Portable waterless urinals have been developed for use at large festivals, concerts and other gatherings, to improve the sanitation facilities and reduce the point load of wastewater discharged at the site. In this way, a large volume of urine can be collected (and either used or discharged at a more appropriate location or time). The remaining toilets can be reduced in number or used more efficiently.

 

Library references

Technology Review of Urine Diversion Components

The publication explains the purposes of urine diversion, its benefits and challenges, urine precipitation, urine treatment and reuse in agriculture. Further, it provides an overview on design and operational aspects for equipment needed, such as waterless urinals and urine diversion toilets including supplier information and indicative costs. Overall, it pulls together scattered knowledge around the topic of urine diversion in a concise manner.

MUENCH, E. von ; WINKER, M. ; (2011): Overview of Urine Diversion Components such as Waterless Urinals, Urine Diversion Toilets, Urine Storage and Reuse Systems. Eschborn: Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH URL [Accessed: 16.10.2013]

Smart Sanitation Solutions

Smart Sanitation Solutions presents examples of low-cost household and community-based sanitation solutions that have proven effective and affordable. A wide range of innovative technologies for toilets, collection, transportation, treatment and use of sanitation products that have already helped thousands of poor families to improve their lives is illustrated.

NWP (2006): Examples of innovative, low-cost technologies for toilets, collection, transportation, treatment and use of sanitation products. (= Smart water solutions ). Amsterdam: Netherlands Water Partnership (NWP) URL [Accessed: 13.04.2010]

This is the compact version of the factsheet.

Read Extended Version

Alternative Versions to

No Structure Described.