The moisture content of the thickened sludge from the screw thickener dewatering machine typically ranges between 75%-85%. This moisture content is generally related to the nature of the sludge, the coagulation condition, and the process of the screw thickener itself.
The nature of sludge determines how easily water can be removed. For instance, sludge with oil content and粘iness is generally more difficult to treat, resulting in higher moisture content. Sludge from papermaking is usually easier to handle. The flocculation process is related to the preliminary treatment process of wastewater, the selection and ratio of additives, etc., because the premise of using a screw press to treat sludge is whether the sludge can flocculate.
The technology for the screw press is sourced from Japan, and we offer quotations for wastewater treatment equipment. However, a direct import may not be suitable for domestic use, hence the need for real-case practice and continuous adaptation to meet local demands. Therefore, the modifications to the screw press for different domestic process manufacturers also vary.
Low-temperature Sludge Drying Technology
The sludge from the wastewater treatment plant is dewatered to 80% using a screw press dewatering machine in the sludge dewatering room, then conveyed by screw conveyors to the wet sludge storage in the deep dewatering workshop. A sludge pump is set beneath the storage, transporting the sludge to the low-temperature drying machine for further dewatering to below 30% moisture content. The dewatered sludge is then conveyed to the dry sludge storage by screw conveyors and scraper conveyors, and finally transported externally for resource utilization.
The sludge drying workshop is equipped with a feeding platform. If the moisture content of the sludge after deep dewatering does not reach the design value, the sludge is transported from the dry sludge storage to the front feeding platform via sludge transport vehicles, poured into the wet material storage, and then reprocessed for further dewatering. The condensate from the deep dewatering of sludge is directly discharged into the factory's wastewater pipeline, which then enters the factory's wastewater treatment system. The odors generated by the drying system are treated through newly constructed biofilters, north of the wastewater treatment equipment, and emitted. All sludge transport vehicles and storage bins must be equipped with enclosed devices to prevent environmental impact on the city and factory areas during transportation.
Wastewater treatment equipment has the advantages of small footprint, simple operation and maintenance, wide application range, and the ability to self-clean without clogging and run continuously with low noise, compared to plate and frame sludge dewatering machines, centrifugal sludge dewatering machines, and belt sludge dewatering machines. The dewatering effect (sludge cake moisture content) has become a focus for many. In fact, the dewatering effect of the screw press sludge dewatering machine is excellent, with a sludge cake moisture content between 75-80%. Some customers have reported that the sludge cake moisture content is high or fluctuates, so let's discuss the reasons for this issue.
The moisture content of the sludge cake discharged by the screw press dewatering machine is mainly influenced by the following aspects:
Spiral shaft variable frequency drive
a. When the frequency of the helical shaft variable-frequency converter is low, the corresponding rotational speed of the helical shaft in the sewage treatment equipment is slow. This results in a longer concentration and dewatering time for sludge within the helical screw body, leading to a lower moisture content in the resulting sludge cake. Consequently, the processing volume in the same period of time is reduced.
b. As the frequency of the helical shaft variable-frequency drive increases, the corresponding rotational speed of the helical shaft also rises, shortening the thickening and dewatering time of sludge within the helical main body. This results in a higher moisture content in the resulting sludge cake, thereby increasing the processing volume within the same time frame.
Wastewater Treatment Equipment Quotation - Hengman Environmental Protection (Online Inquiry) - North Wastewater Treatment Equipment provided by Dezhou Hengman Environmental Protection Technology Co., Ltd. "Screw Press Sludge Dewatering Machine, Microfilter Solid-Liquid Separator" Choose Dezhou Hengman Environmental Protection Technology Co., Ltd. The company is located in: Lingcheng Economic and Technological Development Zone, Aotong Industrial Park, Dezhou City, Shandong Province. For many years, Hengman Environmental Protection has been committed to providing excellent service to our customers. Contact: Manager He. Welcome all new and old customers to call, write, and visit for business discussions. Hengman Environmental Protection looks forward to becoming your long-term partner!
