STASH(Sludge drying Unit )

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Sludge drying Unit ( efficient and scientific disposal of the Resultant sludge from STP/ETPs)

We adopt the technology of direct low temperature drying for sludge . The direct low

temperature drying makes hot effect on sludge, producing high thermal efficiency. Low

temperature also protects organism in the sludge from splitting and volatilization, while the

circulation of the hot air takes only water out from the sludge.

The sludge with moisture content 80% , enters into the oven from above, it is cut into

granules or strips by the slicing machine, and falls into the slow-moving mesh belt by gravity .

The temperature of circulating air entering the drying oven can be controlled between 60 ~70

℃, Humidity < 10% (@ 60 ℃). The dry air absorbs the moisture of the sludge and leaves the

drying box, the humid air temperature is controlled at 30~40 ℃ and the humidity is >50%.

The wet air enters the cooler regenerator ( Heat Exchanger ) , dehumidifies in the condenser

and returns the volatile organic compounds to the liquid phase after condensation, and the

condensed water can be discharged directly to the homogenizer for further treatment. The

whole drying process take place without exhaust gas emissions, doesn’t need any additional

agents. 

Sludge generated from filter press, belt filter, screw press or centrifugal dehydrator

with 80%~85% water content could be reduced to less than 20% water content of treated dry

sludge. The system can be operated efficiently under normal humidity and temperature of

the environment.

Our system is suitable for dispersing, drying and centralized disposal of urban sewage

sludge and can solve the problem of difficult disposal of urban sewage sludge.