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Removal of Struvite to Prevent Problems Associated with its Accumulation in Wastewater Treatment Works

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Abstract:

Deposition of struvite within the infrastructure of wastewater treatment works can cause significant operating difficulties. A laboratory-scale, two-stage, continuously stirred tank reactor was developed to remove struvite to prevent problems associated with its deposition. Before any experimental work was conducted, the mixing regime within the system was determined using a pH-tracer response method. Perfect mixing conditions were achieved once the stirring speed reached 500 rpm. Experiments were conducted examining the effects of various process parameters such as retention time, pH, recycling rate, and ammonium concentration. By increasing the hydraulic retention time, the residual magnesium concentration decreased, with the optimum conditions occurring at 125 minutes.

Keywords: CONTINUOUSLY STIRRED TANK REACTOR; MAGNESIUM AMMONIUM PHOSPHATE; MIXING REGIME; PARTICLE-SIZE ANALYSIS; REYNOLDS NUMBER; SCALE-UP; SIEVING; STRUVITE; TRACER-RESPONSE EXPERIMENTS; WASTEWATER TREATMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143004X151491

Publication date: September 1, 2004

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  • Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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