Skip to main content

Research Repository

Advanced Search

Treatment challenge of a cyanobacterium Romeria elegans bloom in a South Australian wastewater treatment plant: a case study.

Praptiwi, Radisti A.; Pestana, Carlos J.; Sawade, Emma T.; Swain, Nick; Schroeder, Gretchen; Newcombe, Gayle

Authors

Radisti A. Praptiwi

Emma T. Sawade

Nick Swain

Gretchen Schroeder

Gayle Newcombe



Abstract

A bloom of the non-toxic cyanobacterium Romeria elegans in waste stabilisation ponds (WSPs) within Angaston waste water treatment plant (WWTP) has posed an unprecedented treatment challenge for the local water utility. The water from the WSPs is chlorinated for safety prior to reuse on nearby farmland. Cyanobacteria concentrations of approximately 1.2 × 106 cells mL−1 increased the chlorine demand dramatically. Operators continuously increased the disinfectant dose up to 50 mg L−1 to achieve operational guideline values for combined chlorine (0.5-1.0 mg L−1) prior to reuse. Despite this, attempts to achieve targeted combined chlorine residual (CCR) failed. In this study, samples from the waste stabilisation pond at Angaston WWTP were chlorinated over a range of doses. Combined chlorine, disinfection by-product formation, cyanobacteria cell concentration, Escherichia coli inactivation, as well as dissolved organic carbon and free ammonia were monitored. This study shows that, in the occurrence of cyanobacterial blooms, CCR does not directly suggest pathogen removal efficiency and is therefore not an ideal parameter to evaluate the effectiveness of disinfection process in WWTP. Instead, E. coli removal is a more direct and practical parameter for the determination of the efficiency of the disinfection process.

Citation

PRAPTIWI, R.A., PESTANA, C.J., SAWADE, E.T., SWAIN, N., SCHROEDER, G. and NEWCOMBE, G. 2017. Treatment challenge of a cyanobacterium Romeria elegans bloom in a South Australian wastewater treatment plant: a case study. Environmental technology [online], 38(6), 782-788. Available from: https://doi.org/10.1080/09593330.2016.1262454

Journal Article Type Article
Acceptance Date Nov 12, 2016
Online Publication Date Dec 11, 2016
Publication Date Mar 31, 2017
Deposit Date Jun 24, 2021
Publicly Available Date Jun 24, 2021
Journal Environmental Technology
Print ISSN 0959-3330
Electronic ISSN 1479-487X
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 38
Issue 6
Pages 782-788
DOI https://doi.org/10.1080/09593330.2016.1262454
Keywords Chlorination; Wastewater; Cyanobacteria; Romeria elegans; Water reuse
Public URL https://rgu-repository.worktribe.com/output/1148147