High rate production of concentrated sulfides from metal bearing wastewater in an expanded bed hydrogenotrophic sulfate reducing bioreactor

Ostermeyer, Pieter; Landuyt, Josefien Van; Bonin, Luiza; Folens, Karel; Williamson, Adam; Hennebel, Tom; Rabaey, Korneel

doi:10.1016/j.ese.2022.100173

Cited by 6 publications

(3 citation statements)

References 56 publications

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“…This study used PAM doses ranging from 25 to 150 mg/L, based on findings from prior research [9,36]. As presented in Figure 1c, the turbidity, COD, and TSS removals improved marginally with increasing PAM dosage and decreased with further increases in PAM dosage.…”

Section: Pammentioning

confidence: 99%

“…Ferroferric oxide (Fe 3 O 4 , 325 mesh, particle size > 44 µm, Meiqi Industry, Henan, China) was used as magnetic seeds. The jar test (Six-in-one electromotive stirrer, VELP) was used for the optimization trials of pH adjustment chemicals as well as the coagulant, flocculant, and MS. pH optimization was conducted using NaOH and Ca(OH) 2 with a PAC dosage of 0.75 g/L, which was determined based on the literature, where similar rubber wastewater studies [2,9,11] utilized this level to ensure observable coagulation effects. This dosage was observed to achieve high removal efficiency in later trials with PAC optimization.…”

Section: Experiments Of Magnetic Seed Coagulation (Msc)mentioning

confidence: 99%

“…Chemical precipitation, Fenton oxidation, ozonation, ultrasonic irradiation, and electrocoagulation have been the main technologies researched for NRIWW pretreatment processes [8]. Existing pretreatment technologies have significant limitations, including lower efficiency, less flexibility, a necessity for large areas, and high energy consumption during downstream processes (for the aerator in the aerobic treatment system) [9,10]. This problem typically occurs when rubber factories overwhelm their wastewater treatment plants due to increased production over time [6].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Pretreatment of Natural Rubber Industrial Wastewater Using Magnetic Seed Coagulation with Ca(OH)2

Wimalaweera,

Wei,

Ritigala

et al. 2024

Water

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The efficiency of magnetic seed coagulation (MSC) with pH adjustment by NaOH and Ca(OH)2 as a pretreatment for high-strength natural rubber industrial wastewater (NRIWW) was compared in this study. The high content of suspended solids (SSs) and other inhibitory substances of NRIWW is a primary issue which affects its subsequent secondary and tertiary treatment processes. The MSC process with polyaluminum chloride (PAC), anionic polymer (polyacrylamide—PAM)), and magnetic seeds (MS) (ferric oxide (Fe3O4)) was proven to be a cost-effective pretreatment of NRIWW, and Ca(OH)2 showed improved pretreatment performance, with turbidity, COD, and TSS removals of 95%, 56%, and 64%, respectively. Sedimentation was enhanced from 30 min by conventional coagulation to less than 5 min by the MSC. The organic components of NRIWW reacted with MS to generate Fe–OH/Fe–OH+ linkages through processes of surface complexing and hydrogen bonding. According to fractal analysis, the MSC process optimized with Ca(OH)2 produces less complex flocs that are uniform and densely packed. Additionally, MS served as an adsorbent and promoted the development of magnetic flocs by boosting their density and size. MSC with pH adjustment by Ca(OH)2 presents a robust and cost-effective pretreatment process for NRIWW.

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Section: Pammentioning

confidence: 99%

Section: Experiments Of Magnetic Seed Coagulation (Msc)mentioning

confidence: 99%