کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8869496 | 1622608 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Full scale study of Class A biosolids produced by thermal hydrolysis pretreatment and anaerobic digestion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
مهندسی ژئوتکنیک و زمین شناسی مهندسی
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چکیده انگلیسی
Biosolids are the solid by-product of wastewater treatment and contain high-organic matter and nutrient content, which can be utilized in food production and gardening. In 2014, this study's target nutrient recovery facility (NRF) in the Mid-Atlantic region of the U.S. adopted thermal hydrolysis pretreatment (THP) and anaerobic digestion (AD) to upgrade biosolids from Class B (lime-stabilized) to Class A. The pathogen, nutrients, and metals contents were compared with that of Class B biosolids from the same facility throughout a one-year period. Following optimization and equilibrium, stable biosolids were produced that satisfied all Environmental Protection Agency (EPA) Class A biosolids standards. Class A biosolids produced had fecal coliform density consistently below the 1000 MPN/g d.w. limit set by the EPA, at 35.85â¯Â±â¯81.10 MPN/g d.w. (nâ¯=â¯301). Metal concentrations were greater in Class A than Class B biosolids as a result of biosolids mass reduction, but these levels were substantially lower than regulatory limits. Metal concentrations were (in mg/kg d.w.): Asâ¯=â¯6.43â¯Â±â¯0.400 (nâ¯=â¯141), Cdâ¯=â¯3.39â¯Â±â¯0.117 (nâ¯=â¯147), Crâ¯=â¯88.4â¯Â±â¯2.00 (nâ¯=â¯148), Cuâ¯=â¯401â¯Â±â¯9.81 (nâ¯=â¯148), Pbâ¯=â¯68.1â¯Â±â¯2.19 (nâ¯=â¯148), Hgâ¯=â¯1.21â¯Â±â¯0.116 (nâ¯=â¯148), Moâ¯=â¯14.9â¯Â±â¯0.321 (nâ¯=â¯148), Niâ¯=â¯23.8â¯Â±â¯0.911 (nâ¯=â¯146), Seâ¯=â¯10.0â¯Â±â¯0.573 (nâ¯=â¯140), Znâ¯=â¯778â¯Â±â¯14.9 (nâ¯=â¯148), Kâ¯=â¯850â¯Â±â¯21.7 (nâ¯=â¯134). In addition, Class A biosolids were rich in total nitrogen (N) and higher in total phosphorus (TP), but low in potassium (K) content. Concentration of K was 850â¯Â±â¯21.7â¯mg/kg d.w. (nâ¯=â¯134), TKN was 52,000â¯Â±â¯13,300â¯mg/kg d.w. (nâ¯=â¯43), TP was 34,500â¯Â±â¯6130â¯mg/kg d.w. (nâ¯=â¯42), and ammonia-N was 7860â¯Â±â¯1350â¯mg/kg d.w. (nâ¯=â¯43).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Waste Management - Volume 78, August 2018, Pages 43-50
Journal: Waste Management - Volume 78, August 2018, Pages 43-50
نویسندگان
Xuanzhao Wang, Natasha Andrade, Jessica Shekarchi, Sarah J. Fischer, Alba Torrents, Mark Ramirez,