===Solids and Trash===
Excessive solids in wastewater are caused by trash entering the sewer system or generated by processes at the facility. It enters the wastewater stream and then has to be removed at the treatment process. Converting open sewer channels to piped sewers can dramatically reduce trash entering the wastewater stream. Trash traps at public markets for fish, meat and vegetable stalls is required.
[[Costs_for_Sanitation_Options_-_Markets|Costs for Sanitation Options for Markets]]
Trash traps are simple devices that prevent solid waste from flowing down the drains and causing drainage problems. Traps are often located at strategic locations on the wastewater collection system. Remember that trash traps must be cleaned frequently, and the screenings should be placed in covered receptacles and disposed of as solid waste.
[[File:Trashtrap1.jpg|right|200px]]
[[File:Trashtrap2.jpg|right|200px]]
[[File:Markets.png|right|200px]]
There are two main types of trash traps for markets. The first - pictured to the right - is a mesh box developed by researchers in Kuala Lumpur for channelized sewers. Its design is flexible and easy to install. It can be designed to fit into sewer channels at strategic locations selected to trap the most solids. Hinged lids and doors make this unit especially easy to clean and maintain. Plastic coated metal components protect against corrosion, making this an extremely durable product.
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The second style of trap suitable for markets is shown in the diagram to the leftright. Designed for piped and not canalized sewers this one is made of concrete and can be retrofit. This is a low cost option that can be constructed on-site using locally available materials and labor.<br/>
''[[Practitioner's Tool / Costs_for_Sanitation_Options_-_Markets|Costs for Sanitation Optionsfor Markets]]''
''====Other Pretreatment Issues for Markets: ''====Markets with food preparation or utensil washing should follow the [[Food_Service_(Practitioner's Tool / Determining Pretreatment Needs – Grease)|pretreatment recommendations for restaurants]], including installing grease traps.
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