Optimalization of Metals Ions Extraction from Industrial Wastewater Sludge with Chelating Agents / Optymalizacja Procesu Ekstrakcji Jonów Metali Z Przemysłowych Osadów Ściekowych Za Pomocą Roztworów Związków Chelatujących

Karwowska, Beata

doi:10.2478/v10265-012-0036-2

Cited by 4 publications

(1 citation statement)

References 17 publications

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“…The content of heavy metals in combined organic acid solution is in accordance with liquid fertilizer regulations. Although previous studies usually use citric acid to leach out heavy metals from SS by 0.5M citric acid [43,44], the concentration of citric acid is very low (<0.01 M) in combined organic acid. Thus, heavy metals aren't leached out by combined organic acid.…”

Section: Comprehensive Comparison Of Combinedmentioning

confidence: 99%

Sustainable Utilization of Sewage Sludge through the Synthesis of Liquid Fertilizer

2021

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In a world with a growing human population, resources are becoming increasingly scarce. To ensure food supply, fertilizers are often used to accelerate growth when planting agricultural products. Sewage sludge (SS), containing as high as 10–15 wt% Phosphorus (P), can be synthesized into liquid fertilizer. P species in SS can generally be classified into four types: inorganic phosphorus (IP), organic phosphorus (OP), nonapatite inorganic phosphorus (NAIP), and apatite phosphorus (AP). However, OP is not leached out by wet chemical methods and NAIP is not bioavailable. This study investigated the P-form conversion (OP and NAIP to AP) in SS by adding 8 wt% CaO at 300 °C. SS through pretreatment can easily leach out P when combined with organic acid. The content of heavy metals is in accordance with fertilizer regulations in a leaching solution. The solution was mixed with potassium and ammonia compounds to synthesize a liquid fertilizer. To ensure the safe and efficient use of liquid fertilizer and undertake an analysis of heavy metals, an aquatic organisms (D. magna) toxicity test, and the growth of plants test were both used. The liquid fertilizer can be demonstrated to accelerate the growth of plants while not causing the death of D. magna in short time, as the liquid fertilizer has enough nutrients to help the D. magna to survive.

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Section: Comprehensive Comparison Of Combinedmentioning

confidence: 99%