Solar Sludge Drying Model

The greenhouses of solar drying for urban residual sludge represent an economic alternative to the classic thermal dryers.

Solar sludge drying model.

Also the automation degree of sewage sludge feeding and removal is variable. As the sludge dries the mole granulizes it into a uniform consistent pelletized end product. The solar sludge drying systems can be erected on a variety of flat or inclined surfaces in a range of climates and can be adapted to retrofit existing drying beds. The sludge is transported.

For the largest plant production rate of 25 900 kg sludge hr with ds i i of 22 land requirement for the drying system was 56 of the existing area. Solar radiation along with bio drying. The basic principle of the system is drying of sewage sludge in a glasshouse using the incident solar radiation. Total areas occupied by gsds and solar panels at wwtps were equivalent to 0 1 for wwtp 37 to 71 for wwtp 14 of the existing wwtp areas.

Windrow operation and regular addition of fresh sludge maximize bio drying and promote easy storage of sludge on a 6 months to 1 year cycle in the greenhouse. Disposal of that sludge which contain 20 dry solids is very difficult without drying process. Solar sludge drying excels in fulfilling key economic and environmental goals. The limits of mechanical sludge drying sometimes create the need for thermal drying by water evaporation.

According to a multiplicative model for sludge solar drying developed by seginer and bux 15 a corresponding drying rate between 6 3 and 9 3 kg h 2 o m 2 á day can be calculated based on the. For wwtp 2 production rate of 13 223 kg sludge hr with ds i i of 26 requirement decreased to 18. Solar energy is used to extract water from sewage sludge a simple and cheap process that not only reduces the sludge considerably in terms of volume but also saves truck mileage and c0 2 emissions. The combined sludge turning and transporting system is at the heart of the drying plant.

Ventilation with dry air from the outside. Sludge can be dried in batches using a semi continuous process by means of a fully. A special sludge turning system performs both spreading and turning of the sludge as well as its transport from one side to the other. Dewatered sludge and drying sludge are mixed and shaped into windrows by the soliamix windrow turner.

Drying sludge for optimal recovery. Three processes are available. The huber solar regenerative sludge dryer srt is able to meet the most different specific customer requirements whether as a pure solar dryer or all year round dryer operated with additional heat. Suez has developed a number of sludge drying processes that allow the sludge to be recovered for a multitude of uses as fertilisers co products for composting or as fuel for incineration plants.

After mechanical dewatering sludge contains 20 dry solids.