کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4481385 1623102 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An exploratory study on seawater-catalysed urine phosphorus recovery (SUPR)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
An exploratory study on seawater-catalysed urine phosphorus recovery (SUPR)
چکیده انگلیسی


• The ureolysis can largely assist the P recovery efficiency in SUPR system.
• 40% of ureolysis is adequate for achieving >90% P recovery efficiency within 10 min.
• The precipitates from SUPR can be directly applied as fertilizer with abundant N&P.

Phosphorus (P) is a crucial and non-renewable resource, while it is excessively discharged via sewage, significant amounts originating from human urine. Recovery of P from source-separated urine presents an opportunity not only to recover this precious resource but also to improve downstream sewage treatment works. This paper proposes a simple and economic method to recover urine derived P by using seawater as a low-cost precipitant to form struvite, as Hong Kong has practised seawater toilet flushing as an alternative water resource since 1958. Chemical reactions, process conditions and precipitate composition for P precipitation in urine have been investigated to develop this new urine P recovery approach. This study concluded that ureolysis extent in a urine-seawater mixture determines the reaction pH that in turn influences the P recovery efficiency significantly; 98% of urine P can precipitate with seawater within 10 min when 40–75% of the urea in urine is ureolysed; the urine to seawater ratio alters the composition of the precipitates. The P content in the precipitates was found to be more than 9% when the urine fraction was 40% or higher. Magnesium ammonium phosphate (MAP) was confirmed to be the predominant component of the precipitates.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 66, 1 December 2014, Pages 75–84
نویسندگان
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