Harvesting microalgae from wastewater treatment systems with natural flocculants: Effect on biomass settling and biogas production

Gutiérrez, Raquel; Passos, Fabiana; Ferrer, Ivet; Uggetti, Enrica; García, Jesús Miguel Bairán

doi:10.1016/j.algal.2015.03.010

Cited by 107 publications

(69 citation statements)

References 25 publications

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“…For pH values of approximately 8, the MBM recovery from a raceway pond, which treats wastewater, were greater than 90% by using 50 mg/L of Tanfloc ® SG 30 as the coagulant. In contrast, the same study conditions of Gutierrez et al 31 were established in this study efficiency of 96.7% using Tanfloc ® Pop modified tannin as coagulant. When cationic starch is used as a coagulant in MBM recovery, with doses between 80 and 150 mg/L, the removal efficiencies were above 80% for a wide range between pH 7and 11.…”

Section: Resultsmentioning

confidence: 76%

Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

Cassini

Francisco

Antunes

et al. 2017

Braz. arch. biol. technol.

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Section: Resultsmentioning

confidence: 76%

Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

Cassini

Francisco

Antunes

et al. 2017

Braz. arch. biol. technol.

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“…Further, the separation of solids from biofilm sloughing requires high-cost processes, such as centrifuging or filtration, which needs deeper investigation. While recent work suggests natural flocculants can be used to improve settling (e.g., Gutiérrez et al, 2015), it has not been proven beyond pilot scale, and the storage and management of such chemicals may not be feasible at a small-scale treatment works.…”

Section: Application Of Algal P Systemsmentioning

confidence: 99%

A Review of Phosphorus Removal Technologies and Their Applicability to Small-Scale Domestic Wastewater Treatment Systems

Bunce

Ndam

Ofiţeru

et al. 2018

Front. Environ. Sci.

386

226

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The removal of phosphorus (P) from domestic wastewater is primarily to reduce the potential for eutrophication in receiving waters, and is mandated and common in many countries. However, most P-removal technologies have been developed for use at larger wastewater treatment plants that have economies-of-scale, rigorous monitoring, and in-house operating expertise. Smaller treatment plants often do not have these luxuries, which is problematic because there is concern that P releases from small treatment systems may have greater environmental impact than previously believed. Here P-removal technologies are reviewed with the goal of determining which treatment options are amenable to small-scale applications. Significant progress has been made in developing some technologies for small-scale application, namely sorptive media. However, as this review shows, there is a shortage of treatment technologies for P-removal at smaller scales, particularly sustainable and reliable options that demand minimal operating and maintenance expertise or are suited to northern latitudes. In view of emerging regulatory pressure, investment should be made in developing new or adapting existing P-removal technologies, specifically for implementation at small-scale treatment works.

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“…Gutiérrez et al verified wastewater treatment with microalgae culture with an initial microalgae concentration of 0.6 kg · m −3 using tannin basis flocculants (Ecotan and Tanfloc) and obtained maximum settling velocities of 5.67 × 10 −4 m · s −1 (Ecotan) and 3.50 × 10 −4 m · s −1 (Tanfloc). These results are similar to the ones obtained in this work, in which the settling velocity reached for concentration of 0.66 kg · m −3 was equal to 4.56 × 10 −4 m · s −1 .…”

Section: Resultsmentioning

confidence: 99%

Experimental validation of hindered settling models and flux theory applied in continuous flow process for harvesting Acutodesmus obliquus

Hanashiro¹,

Stoco²,

Oliveira

et al. 2019

Can J Chem Eng

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Batch settling and flux theory were used to predict the best working conditions in a continuous flow process for havesting Acutodesmus obliquus using a tannin‐basis flocculant. From batch tests, a settling velocity model was proposed. Three different models were tested: two exponential functions; and one power‐law function. The power‐law function presented a lower variance (1.356 × 10−9) and R2 equal to 0.995. This suggested model was applied in flux theory, and the system performance was predicted by feed flowrate and initial microalgae concentration in continuous flow process. In experimental tests, a pilot settler (0.045 m3) was used to validate the proposed model. Nine different experimental conditions of feed flowrate and initial microalgae concentrations were used to evaluate the settling behaviour of the unit. The flux theory predicted better results when the applied solids flux was near limiting the solids flux. Experimental results showed that in the proposed working condition of 10−5 m3 s−1 feed flowrate and 58 kg · m−3 initial microalgae concentration, the highest biomass removal was 98.3 %, and sludge concentration profiles could stabilize over time. Overall, these results demonstrate a potential application of the batch tests and theory flux to predict a continuous flow process, considering biomass purification.

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Harvesting microalgae from wastewater treatment systems with natural flocculants: Effect on biomass settling and biogas production

Abstract: 19Research on new sources of bioenergy is nowadays driving attention to microalgae. Cost-effective biomass harvesting 20 and thickening pose a challenge for massive microalgae production for biofuels. In this study, coagulation-flocculation

Cited by 107 publications

References 25 publications

Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

A Review of Phosphorus Removal Technologies and Their Applicability to Small-Scale Domestic Wastewater Treatment Systems

Experimental validation of hindered settling models and flux theory applied in continuous flow process for harvesting Acutodesmus obliquus

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