Abstract
Anaerobic digestion is a crucial step with secondary treatment in wastewater treatment plants (WTPs) and sewage treatment plants (STPs). Historical evidences where the digester has encountered accumulation of struvite as phosphorus precipitate are due to high pH of anaerobic digestion hence more prone to struvite formation fouling and encrusting the sludge return lines, associated pumps, valves and increasing the maintenance cost. This study focuses on recovery of phosphorous (P) from struvite in available Indian conditions. The results lay a background for options both in terms of technique and technology for P recovery from sewage sludge. The recovered phosphorus in form of crystals has been investigated further by SEM-EDX studies for their morphology and structure. Further XRD results also confirm the intensity peaks of recovered P crystals to be similar with pure struvite crystals. The recovered phosphorous in form of magnesium aluminium phosphate (MAP) crystals can be used as fertilizer in agricultural industry.
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Acknowledgements
The authors would like to thank the officials at Delhi Jal Board (DJB) for providing the samples for the study of the project. We also thank IIT Delhi for training and access to X-ray diffractometry instruments. Due acknowledgement to Mr. Shashank Pandey and Mr. Murugan for their extensive laboratory support.
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Gupta, S., Kansal, A., Jasrotia, S. (2018). Phosphorous Recovery as Struvite from Anaerobically Digested Sewage Sludge Liquors in Delhi, India. In: Siddiqui, N., Tauseef, S., Bansal, K. (eds) Advances in Health and Environment Safety. Springer Transactions in Civil and Environmental Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7122-5_25
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DOI: https://doi.org/10.1007/978-981-10-7122-5_25
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