Electrolysis using Pt/SS electrodes for aluminum recovery from drinking water treatment sludge
- PDF / 1,316,230 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 35 Downloads / 219 Views
ORIGINAL ARTICLE
Electrolysis using Pt/SS electrodes for aluminum recovery from drinking water treatment sludge Rizkiy Amaliyah Barakwan1 · Wahyu Budi Pratiwi1 · Yulinah Trihadiningrum1 · Arseto Yekti Bagastyo1 Received: 4 February 2020 / Accepted: 5 August 2020 © Springer Japan KK, part of Springer Nature 2020
Abstract Alum sludge from the drinking water treatment plant (DWTP) of Surabaya City, Indonesia, potentially contains high aluminum and organic pollutant contents. Aluminum is sourced from the use of aluminum sulfate as a coagulant during the water treatment process. Whereas, the organic pollutant is from domestic and industrial wastewater discharges into the raw water source. Aims of this study were to characterize the alum sludge of the Surabaya DWTP, to determine suitable electrode materials and optimum electrical current for aluminum recovery using electrolysis. The sludge was characterized according to metal concentrations and chemical oxygen demand (COD). Cyclic voltammetry, a common method for determining appropriate electrode materials for electrolysis, was conducted to confirm platinum (Pt) and stainless steel A304 (SS A304) as suitable electrodes. A polarization test was applied to determine the current for electrolysis. Electrolysis using these electrodes was conducted in one compartment reactor for 6 h. The results showed that the sludge had high concentrations of aluminum and organic substance. The suitable anode and cathode in the electrolysis of acidified alum sludge at pH 3 were Pt and SS A304, respectively. Aluminum recovery efficiency was achieved at 300 mA (52.10%), in which metal impurities were low, and COD removal was 24%. Keywords Acidified sludge · Aluminum recovery · Cyclic voltammetry · Drinking water sludge · Electrolysis
Introduction Aluminum sulfate or alum is widely used as a coagulant in drinking water treatment [1]. The drinking water treatment plant (DWTP) of Surabaya City in Indonesia generated about 253.65 m3/day of alum contained sludge in early 2016 and increased to 626 m 3/day at the end of 2017 [2, 3]. The sludge of which aluminum concentration varied between 1194 and 126,100 mg/L, was directly discharged into Surabaya river [4, 5]. The high aluminum concentration can cause accumulation in river sediment, aquatic biota, and humans via the food chain [6]. This bioaccumulation is potentially toxic to Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10163-020-01097-0) contains supplementary material, which is available to authorized users. * Yulinah Trihadiningrum [email protected] 1
Department of Environmental Engineering, Faculty of Civil, Planning, and Geo‑Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia
aquatic biota and humans, by resulting in central nervous system failure, memory loss, dementia, lethargy, and severe trembling [1]. Effort for aluminum recovery from DWTP sludge is potential to be undertaken for minimizing the toxic property of the slu
Data Loading...
