Animal manure sludge dewatering
As the volume of livestock farming waste increases, the management thereof requires additional attention in that the manure can differ widely in consistency.
The handling of liquid, semi-solid and solid sludges require different handling techniques and equipment to streamline the production, collection, transfer, treatment, storage and utilisation.
Belt and screw presses are currently the most common equipment used to dewater manure sludges. The low capture rate of suspended solids and low separation efficiency with high maintenance costs requires a rethink of these methods.
Currently, dewatering and composting represent the most common methods used to treat and valorize animal manure sludge allowing their utilization as a soil enhancer. The use of dewatered and composted livestock manure is favoured over untreated liquid manure due to its lower volume and smaller particle size, allowing easier handling and facilitating more uniform application.
The Total Suspended Solids (TSS) and Biochemical Oxygen Demand (BOD) of the filtrate (wastewater) from the dewatering process must be kept under control. These levels must adhere to environmental regulations when released or reused.
The dewatering of sludge produced from animal manure is currently performed with belt and screw press technology to reduce effluent charges and BOD levels. These presses are found to be problematic because of high maintenance and low efficiency.
Sinowatek presents the Fournier Rotary PressTM to address the problems mentioned above, since the characteristics of this technology guarantee low energy consumption and separation efficiency with low maintenance costs.
With a cake dryness around 35% total solids (TS) and a capture rate of more than95%, this technology ensures that the total suspended solids (TSS) in the filtrate is so low that little additional treatment processes for the filtrate are necessary for environmental regulation purposes.
Benefits for the client:
- The Fournier Rotary PressTM ensures high consistency and good cake dryness using very little electrical power while operating with minimum operator assistance.
- The higher cake dryness reduces the biological oxygen demand (BOD) of the residual water.
- The dryer waste is lighter in weight, resulting in lower storage and logistic costs.
- The Fournier Rotary PressTM is an expandable technology, allowing up to 8 channels to be added to the unit to accommodate future increases in sludge volumes.