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Phosphorus removal by microelectrolysis and sedimentation in the integrated devices

Bartosz Libecki Tomasz Mikołajczyk
Archives of Environmental Protection | 2021 | vol. 47 | No 1 | 3-9 | DOI: 10.24425/aep.2021.136442
Keywords ZVI phosphorus removal microelectrolysis coagulator
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Abstract

This paper presents the results of tests performed on an installation with an aerated microelectrolytic bed (MEL-bed) and sludge sedimentation. The systems were designed in two versions, differing in the aeration method, i.e., a mechanically aerated coagulator (MAC) and an automatically aerated coagulator (AAC). The experiment demonstrated a high (approx. 84%) efficiency of phosphorus removal from a model solution for both versions. The corroding bed was the source of iron in the solution. In the initial phase aeration method affected the phosphorus removal rate, flocculation and sedimentation processes. Physical and chemical changes in the MEL-bed packing were observed.
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Authors and Affiliations

Bartosz Libecki
1
ORCID: ORCID
Tomasz Mikołajczyk
1
ORCID: ORCID
  1. Department of Chemistry, Faculty of Environmental Management and Agriculture, University of Warmia and Mazury in Olsztyn, Poland

Optimization of induced crystallization reaction in a novel process of nutrients removal coupled with phosphorus recovery from domestic wastewater

Haiming Zou Yan Wang
Archives of Environmental Protection | 2017 | vol. 43 | No 4 | DOI: 10.1515/aep-2017-0037
Keywords phosphorus recovery induced crystallization (IC) Hydroxyapatite (HAP) domestic wastewater enhanced biological phosphorus removal (EBPR)
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Abstract

Phosphorus removal and recovery from domestic wastewater is urgent nowadays. A novel process of nutrients removal coupled with phosphorus recovery from domestic sewage was proposed and optimization of induced crystallization reaction was performed in this study. The results showed that 92.3% of phosphorus recovery via induced Hydroxyapatite crystallization was achieved at the optimum process parameters: reaction time of 80 min, seed crystal loads of 60 g/L, pH of 8.5, Ca/P mole ratio of 2.0 and 4.0 L/min aeration rate when the PO43--P concentration was 10 mg/L in the influent, displaying an excellent phosphorus recovery performance. Importantly, it was found that the effect of reaction temperature on induced Hydroxyapatite crystallization was slight, thus favoring practical application of phosphorus recovery method described in this study. From these results, the proposed method of induced HAP crystallization to recover phosphorus combined with nutrients removal can be an economical and effective technology, probably favoring the water pollution control and phosphate rock recycle.

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Authors and Affiliations

Haiming Zou
Yan Wang

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