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Open AccessArticle

Influent with Particulate Substrate, Clean, Innocuous and Sustainable Solution for Bulking Control and Mitigation in Activated Sludge Process

Department of Civil and Environmental Engineering, University of Bío-Bío, Avenida Collao 1202, Casilla 5-C, Concepción 378000, Chile
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Academic Editors: Qilin Wang, Dongbo Wang, Yingqun Ma, Jing Sun and Li Gao
Water 2021, 13(7), 984; https://doi.org/10.3390/w13070984
Received: 22 February 2021 / Revised: 25 March 2021 / Accepted: 27 March 2021 / Published: 2 April 2021
(This article belongs to the Special Issue Innovative Technologies for Wastewater and Water Treatment)
This research studies the incidence of the type of substrate, soluble or particulate, in the emergence, development, and inhibition of bulking in activated sludge systems. It was evaluated using the sludge volume index (SVI), mixing liquor-suspended solids (MLSS), microscopic analysis of biomass, and effluent suspended solids (ESS). In the first experiment, four sequencing batch reactors (SBRs) were fed with soluble substrate at a fixed mass, while the mass of the particulate substrate varied, as those (saccharose mass/flour mass) ratios were 3:1, 3:2, 3:3 and 3:4., with a deficit ranging from 20 to 30% compared to the ratio recommended. The four SBRs have similar MLSS, IVL, and ESS. From day 30, with a deficit from 80 to 90%, the influents have ratios 1/1 and 1/2 until 48 days. The SBRs present IVL between 600 and 730 mL/g and ESS from 370 to 440 mg/L; unlike influents with ratios 1/3 and 1/4, they present IVL between 170 and 185 mL/g, and ESS from 260 to 270 mg/L. The favorable effect of particulate matter is categorical. In the second set of experiments, two SBRs were studied: SBR 1 fed with saccharose, and SBR 2 with flour; there is a lack of nutrients causing bulking in SBRs. Once the nutrient deficiency condition is changed in day 11 to excess, after 22 days, the SVI was 190 mL/g, ESS was 360 mg/L, and MLSS was 2000 mg/L for influents with saccharose; the influent with flour, with an SVI of 80 mL/g, ESS of 100 mg/L, and MLSS of 4000 mg/L, shows faster and more consistent recovery with the particulate substrate. Therefore, the proposal is to add particulate substrate-like flour to active sludge plants facing bulking. It is a clean, innocuous and sustainable alternative to processes that use chemical reagents. View Full-Text
Keywords: particulate substrate; filamentous bacteria; bulking particulate substrate; filamentous bacteria; bulking
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MDPI and ACS Style

Cisterna-Osorio, P.; Calabran-Caceres, C.; Tiznado-Bustamante, G.; Bastias-Toro, N. Influent with Particulate Substrate, Clean, Innocuous and Sustainable Solution for Bulking Control and Mitigation in Activated Sludge Process. Water 2021, 13, 984. https://doi.org/10.3390/w13070984

AMA Style

Cisterna-Osorio P, Calabran-Caceres C, Tiznado-Bustamante G, Bastias-Toro N. Influent with Particulate Substrate, Clean, Innocuous and Sustainable Solution for Bulking Control and Mitigation in Activated Sludge Process. Water. 2021; 13(7):984. https://doi.org/10.3390/w13070984

Chicago/Turabian Style

Cisterna-Osorio, Pedro; Calabran-Caceres, Claudia; Tiznado-Bustamante, Giannina; Bastias-Toro, Nataly. 2021. "Influent with Particulate Substrate, Clean, Innocuous and Sustainable Solution for Bulking Control and Mitigation in Activated Sludge Process" Water 13, no. 7: 984. https://doi.org/10.3390/w13070984

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