Ultraviolet radiation pre-treatment modifies dairy wastewater, improving its utility as a medium for algal cultivation

Passero, Maxine; Cragin, Benjamin; Hall, Amy R.; Staley, Nathan; Coats, Erik R.; McDonald, Armando G.; Feris, Kevin P.

doi:10.1016/j.algal.2014.09.008

Cited by 21 publications

(13 citation statements)

References 35 publications

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“…Microalgae was not so highly efficient in removing organic substance compared to nitrogen and phosphorous. The maximum COD removal percentage and removal rate of 54.82% and 41.31 mg·L -1 day -1 , respectively, are achieved in 25% RDW, which is higher than that reported by In addition, lower utility of the organic substances in RDW for microalgae growth could also lead to worse COD removal performance (Passero et al, 2014). After the second day, the steadily rise of COD in 5% RDW and 10% RDW might be attributed to soluble organic compounds released by algae (Fig.…”

Section: Nutrient Removalmentioning

confidence: 54%

Cultivation of Chlorella sp. using raw dairy wastewater for nutrient removal and biodiesel production: Characteristics comparison of indoor bench-scale and outdoor pilot-scale cultures

Wang

et al. 2015

Bioresource Technology

138

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Section: Nutrient Removalmentioning

confidence: 54%

Cultivation of Chlorella sp. using raw dairy wastewater for nutrient removal and biodiesel production: Characteristics comparison of indoor bench-scale and outdoor pilot-scale cultures

Wang

et al. 2015

Bioresource Technology

138

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“…Fermenter liquor characteristics for the period of operations associated with this study were as follows (n=26): 2410±470 mgCOD HAc L −1 , 1230±1720 mgCOD HPr L −1 , 982±238 mgCOD HBu L −1 , 456±53 mgCOD HVa L −1 , and 41±27 mgCOD HCa L −1 . In a previous study (Hanson et al 2016) the VFA fraction (COD basis) of dairy manure fermenter liquor was estimated at 70%; based on Enrichment reactor effluent data, the non-biodegradable fraction was approximately 10% (Passero et al 2014). Limited analysis on nutrients showed ammonia-N ranging from 448–1143 mgN L −1 and orthophosphate ranging from 25–131 mgP L −1 ; thus, the fermenter liquor substrate was not macronutrient deficient.…”

Section: Methodsmentioning

confidence: 99%

Polyhydroxyalkanoate synthesis by mixed microbial consortia cultured on fermented dairy manure: Effect of aeration on process rates/yields and the associated microbial ecology

2016

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Polyhydroxyalkanoates (PHAs) are biodegradable polymers that can substitute for petroleum-based plastics in a variety of applications. One avenue to commercial PHA production involves coupling waste-based synthesis with the use of mixed microbial consortia (MMC). In this regard, production requires maximizing the enrichment of a MMC capable of feast-famine PHA synthesis, with the metabolic response induced through imposition of aerobic-dynamic feeding (ADF) conditions. However, the concept of PHA production in complex matrices remains unrefined; process operational improvements are needed, along with an enhanced understanding of the MMC. Research presented herein investigated the effect of aeration on feast-famine PHA synthesis, with four independent aeration state systems studied; MMC were fed volatile fatty acid (VFA)-rich fermented dairy manure. Regardless of the aeration state, all MMC exhibited a feast-famine response based on observed carbon cycling. Moreover, there was no statistical difference in PHA synthesis rates, with qPHA ranging from 0.10–0.19 CmmolPHA gVSS−1 min−1; VFA uptake rates exhibited similar statistical indifferences. PHA production assessments on the enriched MMC resulted in maximum intracellular concentrations ranging from 22.5–90.7% (mgPHA mgVSS−1); at maximum concentration, the mean hydroxyvalerate mol content was 73±0.6%. While a typical feast-famine dissolved oxygen (DO) pattern was observed at maximum aeration, less resolution was observed at decreasing aeration rates, suggesting that DO may not be an optimal process monitoring parameter. At lower aeration states, nitrogen cycling patterns, supported by molecular investigations targeting AOBs and NOBs, indicate that NO2 and NO3 sustained feast-famine PHA synthesis. Next-generation sequencing analysis of the respective MMC revealed numerous and diverse genera exhibiting the potential to achieve PHA synthesis, suggesting functional redundancy embedded in the diverse MMC. Ultimately, results demonstrate that aeration can be controlled in waste-based ADF systems to sustain PHA production potential, while enriching for a diverse MMC that exhibits potential functional redundancy. Reduced aeration could also enhance cost competitiveness of waste-based PHA production, with potential further benefits associated with nitrogen treatment.

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“…Carbohydrate content of lipid-free RBB after CH 2 Cl 2 extraction was analyzed as previously described [26,27]. In short, polysaccharides were first hydrolyzed into monosaccharides with 2 M trifluoroacetic acid (TFA) at 105 • C and then reduced by NaBD 4 and followed by acetylation with acetic anhydride.…”

Section: Chemical Compositionmentioning

confidence: 99%

Production and characterization of bio-oil and biochar from the pyrolysis of residual bacterial biomass from a polyhydroxyalkanoate production process

Wei

Liang

Guho

et al. 2015

Journal of Analytical and Applied Pyrolysis

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a b s t r a c tPolyhydroxyalkanoate (PHA) production generates a significant amount of residual bacterial biomass (RBB) after PHA extraction. The RBB as a zero-value waste contains proteins, carbohydrates, phenolics, and ash, which can be managed and converted to bio-oil and biochar products by pyrolysis. Thermogravimetric analysis (TGA) was used to investigate the thermodegradation kinetics of RBB and pyrolysis-GCMS studies were employed to determine potential chemical products. Pyrolysis was conducted on a laboratory-scale auger reactor at 500 • C. The bio-oil and biochar yield were 28 and 46%, respectively. The pyrolysis bio-oil was characterized by the combination of GCMS, high-pressure liquid chromatography (HPLC), and electrospray ionization mass spectrometry (ESI-MS). The bio-oil was dominated by nitrogen-containing, hydrocarbons, and aromatic compounds. The biochar was studied for its specific surface area and pore size, chemical functionality by Fourier transform infrared (FTIR) and Raman spectroscopies, and butane absorption activity. Biochar was comprised of a large part of polycondensed phenolic and majorly disordered amorphous carbon.

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Ultraviolet radiation pre-treatment modifies dairy wastewater, improving its utility as a medium for algal cultivation

Cited by 21 publications

References 35 publications

Cultivation of Chlorella sp. using raw dairy wastewater for nutrient removal and biodiesel production: Characteristics comparison of indoor bench-scale and outdoor pilot-scale cultures

Cultivation of Chlorella sp. using raw dairy wastewater for nutrient removal and biodiesel production: Characteristics comparison of indoor bench-scale and outdoor pilot-scale cultures

Polyhydroxyalkanoate synthesis by mixed microbial consortia cultured on fermented dairy manure: Effect of aeration on process rates/yields and the associated microbial ecology

Production and characterization of bio-oil and biochar from the pyrolysis of residual bacterial biomass from a polyhydroxyalkanoate production process

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