Reduction of the negative impact of wastewater sludge on the soil by electroosmotic dehydration

The aim of the study is to reduce the negative impact of sewage sludge from the production of cardboard and paper products on the soil by dewatering them with a dehydrator and preparing them for further disposal. Large-scale wastewater sludge from industrial enterprises during utilization is placed at disposal landfills which inevitably leads to a negative impact on the soil cover, littering of territories and withdrawal of the land fund from the economic turnover. In the course of the performed study, the well-known methods of dehydration of moisture-containing material were investigated and there was considered a technical solution to reduce the volume of formation of this type of waste using the example of cardboard and paper production. An electroosmotic installation is proposed, comprising an electrical insulation housing with electrodes: an anode made in the form of a current conductive cover and a cathode made in the form of a conductive perforated bottom of the housing which have a space between them for dehydrated waste. To study the process of sludge dewatering, a series of experiments was carried out on the dehydrator unit with variable voltage parameters between the electrodes. The results of the experimental study were the basis for statistical expressions of the mutual voltage influence between the electrodes, the duration of waste processing, the amount of removed moisture. A model has been obtained that describes the amount of moisture removed during waste treatment. The most productive operating mode of the installation, the time for treatment of waste portion have been established. It has been proven that with the help of an electroosmotic device, up to 70% of moisture is effectively removed from the volume of waste sludge. This makes it possible to significantly decrease their volumes, reduce areas for possible or temporary placement and reduce the ecological load on the environment.

waste water sludge, land littering, electroosmosis, dehydrator, moisture removal, negative impact

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