ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
The amenability of hydrolysed cellulose material to low cost sulfate reduction electrondonor was examined with fluidized bed reactor (FBR) treating synthetic mine waste water. Thestudied cellulose material was dried Phalaris arundinacea reed, which was acid hydrolysed (1.5w/w % H2SO4, 7 w/w % solids) at 120oC to hydrolyse polymeric materials to biodegradablemonomers. The FBR was operated at 35oC, and ethanol has previously been used as the electrondonor. FBR was fed with synthetic waste water (pH 4.5) containing soluble fraction of Phalarisarundinacea hydrolysate, metals (Fe and Zn) and sulfate.The switch of the electron donor from ethanol to hydrolysate was successful. The acidic influentwas neutralized in the FBR by the alkalinity produced in the oxidation of Phalaris arundinaceahydrolysate. The main oxidation product of the soluble hydrolysate was acetate, which accumulatedin the FBR during overloading. The percent sulfate reduction remained in the range of 40-95 %.The highest obtained hydrogen sulfide production was 0.91 g L-1d-1 at a hydraulic retention time(HRT) of 9 h, while highest sulfate reduction was 8.4 g L-1d-1 (HRT 8 h). Iron and zinc precipitatedin the FBR, and highest metal precipitation rates were 1.14 g Fe L-1 d-1 and 30 mg Zn L-1d-1 (HRT 8h). The electron donor load was measured as soluble chemical oxygen demand (CODs), and highestCODs removal rate was 2.13 g L-1d-1 (HRT 9 h) and CODs percent oxidation 92 % (HRT 10 h).Soluble Phalaris arundinacea hydrolysate was found to be a suitable electron donor for sulfatereducing FBR and mine waste water treatment. The soluble fraction of Phalaris arundinaceahydrolysate was used very efficiently by sulfate-reducing bacteria (SRB). Additionally, batch bottleassays showed that SRB-enrichment also used solid, dried Phalaris arundinacea as electron donorfor sulfate reduction (total sulfide yield 340 mg L-1 in 14 days). The results of sulfate reduction andiron precipitation are shown in figures 1 A-B
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.326.pdf
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