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Recovery and re-use of domestic wastewaters using integrated algal ponding systems
Expanded Title:Algal biomass was harvested from the pilot-scale Integrated High rate Algal Ponds (IHRAP) at EBRU in Grahamstown treating domestic wastewater. Laboratory-based pot trials were undertaken in a controlled environment over three growth seasons using algal biomass as a soil amendment and also as a foliar feed application in a range of vegetable types. Chemical commercial fertiliser (2:3:2 N:P:K) was applied as a control based on equivalent nitrogen concentration. From the results of both laboratory and field-scale studies, it has been shown that algal biomass increased yield comparable to, and sometimes exceeding, yield increases shown with the use of chemical fertiliser The studies on utilisation of IHRAP treated water and algal biomass led to the consideration of its application in an Integrated Wastewater Resource Recovery study. The Bushman’s River Sewage Treatment Works and surrounding community was identified as a site for the demonstration of the concept due to its under-performance in meeting current effluent discharge standards. A preliminary planning study was undertaken and showed that a wastewater resource recovery system demonstration plant set up at Bushman’s River or similar sites would not only demonstrate well-researched IHRAP technology, but would also provide an insight into entrepreneurial opportunities that would be available in horticulture, agriculture and mariculture, and therefore lead to employment opportunity and possibly the self-sufficiency, or even profitability, of sewage treatment works to the wider community. The laboratory studies of algal biomass utilisation and the Bushman’s River case study provide the baseline for follow-up investigations. It is recommended that a demonstration plant such as that proposed in the Bushman’s River case study be constructed to subject the concept to a detailed and rigorous investigation and a detailed economic study be undertaken into all aspects of the integrated wastewater resource recovery concept in order to gain support and confidence within the political and sanitation sectors for roll out in the developing world.
Date Published:01/04/2009
Document Type:Research Report
Document Subjects:Wastewater Management - Industrial, Mine water - Mine water treatment
Document Format:Report
Document File Type:pdf
Research Report Type:Technical
WRC Report No:TT 390/09
ISBN No:978-1-77005-827-9
ISBN Set No:978-1-86845-853-9
Authors:Horan SJ; Horan MP; Mohale NG ; Whittington-Jones KJ
Project No:K5/1619
Organizations:Environmental Biotechnology Research Unit Rhodes University
Document Size:6 722 KB
Attachments:EXECUTIVE SUMMARY TT 390.pdf.docx
Table of Contents for TT 390.pdf
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