Phosphate recovery from animal manure wastewater by struvite crystallization and CO2 degasification reactor

• Autorzy: Zhang T. , Li P. , Fang C. , Jiang R.

Identyfikatory

DOI

10.2478/eces-2014-0008

Warianty tytułu

PL

Odzyskiwanie fosforanów ze ścieków obornika za pomocą krystalizacji struwitu i odgazowania z CO2 w reaktorze

• Języki publikacji: EN

Abstrakty

EN

The problem of phosphorus discharge is related to environmental protection and food security. Struvite crystallization is a useful technology for phosphate recovery from wastewater. In the research, struvite crystallization process with CO₂ degasification continuous U-shape reactor (CUSR) was application for phosphate recovery from animal manure wastewater. The result indicated PO₄^3--P recovery ratio could achieve 47-53% without magnesium addition when CUSR hydraulic retention time controlled at 60 min. With extra magnesium addition, PO₄^3--P recovery ratio could significant achieve 80-86% at magnesium addition amount 57.5 mg/dm³. PHREEQC modeling predictions trend of struvite crystallization was close to CUSR experimental results. The modeling calculation can provide a theoretical guide for operational parameters design. For seeding technology, high phosphate recovery efficiency was obtained and preformed struvite was the most effective seeding material. Surface characterization analysis demonstrated the dominant composition of chemical solids was struvite. Water extraction analysis indicated chemical solids recovery from animal manure wastewater could release PO₄^3--P slowly and be available as slow-release fertilizer.

PL

Problem uwalniania fosforu jest związany z ochroną środowiska i bezpieczeństwem żywności. Krystalizacja struwitu jest przydatną technologią odzysku fosforanów ze ścieków. W opisanych badaniach proces krystalizacji struwitu zastosowano do odzyskiwania fosforanów z gnojowicy, do tego celu wykorzystano reaktor ciągłego odgazowywania CO₂ w kształcie litery U (CUSR). Wyniki wskazują, że wskaźnik odzysku PO₄^3- może osiągnąć 47-53% P bez dodatku magnezu, gdy kontrolowany, hydrauliczny czas retencji CUSR wynosi 60 min. Po wprowadzeniu magnezu w ilości 57,5 mg/dm³ wskaźnik odzysku PO₄^3- może osiągnąć 80-86% P. Przewidywania modelu PHREEQC dotyczące krystalizacji struwitu był bliskie wynikom doświadczalnym CUSR. Obliczenia teoretyczne z wykorzystaniem modelu mogą stanowić wskazówkę do ustalania rzeczywistych parametrów eksploatacyjnych. Struwit otrzymany z gnojowicy może mieć zastosowanie w nasiennictwie. Analiza ekstrakcyjna wykazała, że materiał ten może powoli uwalniać PO₄^3-P i dzięki temu znajduje zastosowanie jako nawóz.

Słowa kluczowe

EN

animal manure wastewater; CO2 degasification; continuous U-shape reactor; CUSR; phosphate; struvite crystallization

PL

gnojowica; odgazowanie CO2; reaktor ciągły w kształcie litery U; CUSR; fosforan; krystalizacja struwitu

• Wydawca: Towarzystwo Chemii i Inżynierii Ekologicznej
• Czasopismo: Ecological Chemistry and Engineering. S
• Rocznik: 2014
• Tom: Vol. 21, nr 1
• Strony: 89--99
• Opis fizyczny: Bibliogr. 22 poz., tab., wykr., rys.

Twórcy

autor

Zhang T.

• Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China, phone [phone]

autor

Li P.

• Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China, phone [phone]

autor

Fang C.

• Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China, phone [phone]

autor

Jiang R.

• Key Laboratory of Plant-Soil Interactions of Ministry of Education, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China, phone [phone]

Bibliografia

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