Experiment Study on the effects of natural zeolite on sludge dewatering performance and nitrogen losses

DOI

10.2991/icmaee-14.2014.25How to use a DOI?

Keywords

Sewage sludge,Dewatering, Natural zeolite, Skeleton builder, Nitrogen nutrient

Abstract

Chemical conditioning pretreatment does not always improve sludge dewaterability sufficiently for flocculated sludges with high compressibilities. Physical conditioners, often knows as skeleton builders, are commonly used to improve the dewaterability of sewage sludge. In this study, natural zeolite was used as a skeleton builder, in combination with cationic polyacrylamide (CPAM) or ferric chloride. The filter ability of co-conditioned sludge was affected by the dose of the natural zeolite was evaluated using Specific Resistance to Filtration(SRF) as well as moisture content (MC). The results showed that pretreating the sludge with a combination of natural zeolite and CPAM or ferric chloride can improve sludge dewaterability over CPAM or ferric chloride conditioning alone. When used 2.5kg/tonne CPAM and natural zeolite to adjust the sludge, the maximum reduction of the SRF is form 1.4294×1013m/kg to 1.009×1013m/kg, and the maximum reduction of the moisture content (MC) is from 86.04% to 82.17%. Experiments demonstrated that the natural zeolite(>140meshes) can reduce the concentration of ammonia nitrogen in the reject water, the maximum reduction of the concentration of ammonia nitrogen is from 7.079mg/L to 2.921mg/L. So it can improve the mass of the nitrogen nutrient in sewage sludge after dehydration and improve agricultural potential of the sludge.Use 2.5% dry solid (DS) of ferric chloride in combination with the optimum partical size (>140meshes) to adjust the sludge, the maximumreduction of the SRF is from 1.38×1013m/kg to 1.09×1013m/kg.

Copyright

© 2014, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Haibo Shi
AU  - Jianzhong Zhu
AU  - Jianbiao Chen
AU  - Xudong Qiu
PY  - 2014/03
DA  - 2014/03
TI  - Experiment Study on the effects of natural zeolite on sludge dewatering performance and nitrogen losses
BT  - Proceedings of the International Conference on Material and Environmental Engineering (ICMAEE 2014)
PB  - Atlantis Press
SP  - 91
EP  - 94
SN  - 1951-6851
UR  - https://doi.org/10.2991/icmaee-14.2014.25
DO  - 10.2991/icmaee-14.2014.25
ID  - Shi2014/03
ER  -