E3S Web Conf.
Volume 267, 20217th International Conference on Energy Science and Chemical Engineering (ICESCE 2021)
|Number of page(s)||4|
|Section||Environmental Chemistry Research and Chemical Preparation Process|
|Published online||04 June 2021|
Method for improving of activated sludge drying by the appropriate foaming pre-treatment
1 College of Biological and Environmental Engineering, Changsha University, ChangSha 410022, China
2 Hunan Research Academy of Environmental Sciences, Changsha, Hunan, 410004, China
* Corresponding author: email@example.com
Due to the high viscosity and stickiness of dehydrated sludge, the combination of foaming pretreatment and drying process is an effective method to improve the drying performance of dehydrated sludge. In this study, alkali and industrial lignin fiber addition followed by mechanical whipping was employed for foaming the dewatered sludge. Using alkali alone as foaming agent, the optimal NaOH addition was found at 2.5 wt%, which was superior to adding CaO. Considering the maximum foaming efficiency, 2% industrial lignin fiber FH-300 collected as a conditioner and 1% NaOH was optimal. The foams in dewatered sludge were highly stable. The total number of bubbles of sludge with different densities had big differences. The diameters of bubbles concentrated on the range of 0.1 mm-0.3 mm.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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