Phosphorus recovery from sewage with a sustainable and low-cost treatment system

被引:6
作者
Chaves, Vitor Tonzar [1 ]
Morita, Dione Mari [1 ]
Soares Chao, Iara Regina [2 ]
Contrera, Ronan Cleber [1 ]
机构
[1] Univ Sao Paulo, EP, Dept Engn Hidraul & Ambiental PHA, Ave Prof Almeida Prado 83,Trav 2, BR-05508900 Sao Paulo, SP, Brazil
[2] Co Saneamento Basico Estado Sao Paulo Sabesp, Dept Prospeccao Tecnol Propriedade Intelectual TX, Rua Costa Carvalho 300, BR-05429000 Sao Paulo, SP, Brazil
关键词
constructed wetland; ferric sludge; phosphorus recovery; sustainable sewage treatment; water treatment sludge; CONSTRUCTED WETLAND SYSTEM; REMOVAL; ADSORPTION; SLUDGE;
D O I
10.2166/wst.2019.332
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This study proposes a technology conceived based on an integrative approach that aims to promote phosphorus recovery and to recycle ferric water treatment sludge (FWTS), using it as a phosphorus adsorbent which may be applied as a soil ameliorant after reaching saturation. The assessed pilot plant operated with a daily influent flow of 360 litres and presented a removal efficiency of 94.4% +/- 3.2% for chemical oxygen demand (COD) and of 91.2% +/- 7.8% for suspended solids. It also presented promising results for phosphorus removal. The maximum efficiency of dissolved reactive phosphorus removal was 95% on the first day and it decreased until reaching adsorbent saturation. The estimated breakthrough time was one year in the condition in which the filling medium of a second constructed wetland was only FWTS. In this situation, the effluent phosphorus concentration was 0.2 mg center dot L-1. The authors concluded that the application of FWTS in a constructed wetland bed is an interesting alternative. Batch adsorption experiments were run using phosphorus stock solution. Langmuir and Freundlich adsorption isotherm models were obtained for different initial pH values. The maximum adsorption capacity decreased as the initial pH was increased; values ranged from 4.76 mg P center dot g(-1) (pH = 3.9) to 1.44 mg P center dot g(-1) (pH = 9.0).
引用
收藏
页码:846 / 854
页数:9
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