Characteristics and mechanisms of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543

Huang

Chen

et al. 2017

Sci Rep

Self Cite

A strain was isolated from biological sludge to produce EPS by using anaerobically digested swine wastewater (ADSW). Potential of the EPS in ADSW treatment were discussed. Results showed that the optimal fermentation medium for EPS production was determined as 4 g K2HPO4, 2 g KH2PO4, and 2 g sucrose dissolved in 1 L ADSW. After fermentation for 60 h, 2.98 g EPS with main backbone of polysaccharides can be extracted from 1 L of fermentation broth. The EPS showed good performances in ADSW treatment, after conditioned by this EPS, removal efficiencies of COD, ammonia, and TP reached 70.2%, 76.5% and 82.8%, respectively, which were higher than that obtained when chemicals were selected as conditioning agents. Removal efficiencies were further improved when the EPS and polyaluminum chloride (PAC) were used simultaneously, and finally reached 91.6%, 90.8%, and 92.5%, respectively, under the optimized conditioning process by the composite of EPS of 16 mg/L, PAC of 12 g/L, pH of 7.5, and agitation speed of 200 r/min.

Section: Resultssupporting

confidence: 69%

Section: Resultsmentioning

confidence: 99%

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Enhanced anaerobically digested swine wastewater treatment by the composite of polyaluminum chloride (PAC) and Bacillus megatherium G106 derived EPS

Huang

Chen

et al. 2017

Sci Rep

Self Cite

“…Along with the increasing requirement to environmental quality, production, characterization of bioflocculants, and their performances have been investigated in the treatment of dying wastewater (Liu et al 2009), swine wastewater (Guo et al 2013), and heavy metal ions (Guo 2015). As a result, active ingredients of the bioflocculants and their mechanisms during flocculation process were not entirely clear.…”

Section: Introductionmentioning

confidence: 99%

Characterization and flocculation mechanism of a bioflocculant from potato starch wastewater

Appl Microbiol Biotechnol

Lau

Zhang

et al. 2015

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Novel bioflocculants (BS-MBF) were prepared using the wastewater supernatant from anaerobic co-digestion of corn straw and molasses wastewater as a nutrient resource. Acetic acid and ethanol were the dominant fermentation products during the anaerobic digestion process and were estimated to be 50.5% and 30.0%, respectively, after 150 d of operation. Equal volumes of bioflocculant producing bacteria F2 (Rhizobium radiobacter) and F6 (Bacillus sphaericus) were mixed to form F + , which was inoculated to wastewater supernatant at different times. A maximum flocculation activity of 91.3% was achieved, and 2.32 g/L of purified bioflocculant was extracted when a compound medium from 110-d wastewater supernatant was used. The removal efficiencies of heavy metals from simulated electroplating wastewater were tested by using these prepared bioflocculants. The optimal conditions for heavy metal removal to BS-MBF were found to be at 374 mg/L at an initial pH of 6.0 and a contact time of 40 min. The adsorption capacities for Cu 2+ and Zn 2+ reached more than 90%, while for Cr 6+ it reached approximately 30%. Overall, the study showed for the first time that wastewater supernatant from anaerobic co-digestion of corn straw and molasses wastewater can be used for producing bioflocculants, which can be effectively used to remove heavy metals from electroplating wastewater.

“…In view of the serious health and environmental concerns caused by the traditional flocculants, and the increasing demand for environmental friendly flocculants, bioflocculant, secreted during microorganisms’ metabolic process, has been attracted scientific attention due to its biodegradability and negligible secondary pollution, and has been regarded efficiently in removing suspended solids, organics, dye pigments, heavy metal ions and so on, from wastewaters on laboratory scales (Guo, ). Currently, high costs associated with relatively expensive substrates (such as beef extract, peptone and so on) gradually became impediments for the production and application of the bioflocculant (Zhao et al ., ), and thus, attempts have been made to get new efficient mutant and seeking for low‐cost substrates to reduce the production cost (More et al ., ; Guo & Ma, ; Guo et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced efficiencies of sludge dewatering and domestic wastewater treatment by using the bioflocculant from rice stover

Chen

et al. 2016

Water & Environment J

Self Cite

Potential of a bioflocculant from rice stover was studied in sludge dewatering and domestic wastewater treatment. Production of this bioflocculant showed good correspondence to cell growth, after fermentation for 60 h, the fermentation liquor was obtained, from 1.0 L of which a value of 2.37 g bioflocculant can be extracted, and the main backbone of this bioflocculant was polysaccharides. Without adjusting the sludge's initial pH value of 6.5, when incubated with 18 mg/L of this bioflocculant, dry solids (DS) and specific resistance to filtration (SRF) of the typical wastewater activated sludge reached 18.5% and 4.7 3 10 12 m/kg, respectively, which was better than the ones achieved by Al 2 (SO 4 ) 3 and FeCl 3 flocculants. For domestic wastewater treatment, after treated by 12 mg/L of this bioflocculant at pH value of 7.5, removal efficiencies of chemical oxygen demand (COD) and turbidity can reach 91.8 and 89.7%, respectively, which were better than the ones achieved by the traditional flocculants such as Al 2 (SO 4 ) 3 , FeCl 3 , and polyaluminum chloride (PAC). This study suggested that the bioflocculant from rice stover has great potentials as an alternative flocculant to conventional flocculants in sludge dewatering and domestic wastewater treatment.