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Mongolia, China

Sun Z.-L.,CAS Institute of Process Engineering | Sun Z.-L.,Yantai University | Xue S.-Z.,CAS Institute of Process Engineering | Yan C.-H.,CAS Institute of Process Engineering | And 2 more authors.
RSC Advances | Year: 2016

CO2 supplementation is usually a limiting factor in microalgal culture systems, especially when flue gases are used as the carbon source. In this study, tris(hydroxymethyl)aminomethane (THAM) was applied as a gas carrier to increase CO2 storage capacity in the culture medium and enhance microalgal biomass production. Abiotic experiments showed that the amount of CO2 absorbed by the medium within the same absorption time increased with increasing THAM concentration, and the gas absorptivity maintained a higher level (>60%) under the neutral pH conditions. Cell growth in shaker flasks illustrated that the biomass productivities of Scenedesmus dimorphus were significantly improved (31 to 66%) when the medium contained 2-8 mmol L-1 THAM. Meanwhile, THAM was not biodegraded during the cultivation. The biomass productivities achieved with 6 mmol L-1 THAM were much higher (32 to 33%) than that with routine culture when it was applied into an open raceway reactor system (2 m2), and the CO2 utilisation efficiency also increased by 6 to 12%. The results show that the addition of THAM as a gas carrier for enhancing CO2 input could be an easy-to-use and cost-effective approach for mass cultivation of microalgae. © 2016 The Royal Society of Chemistry. Source

Gu W.-R.,Elion Resources Group | Mou H.-J.,Elion Resources Group | Zhang S.-F.,Elion Resources Group
Xiandai Huagong/Modern Chemical Industry | Year: 2012

With L16(4 5) orthogonal method, the effects of concentration of acid and other five factors on the chemical regeneration process for waste perfluo-sulfonate ion membrane are studied. The optimal operation parameters are shown as follows: 15%-20% of concentration of hydrochloric acid, 60°C of water temperature, 12-24 hours of soaking time, 1-2 hours ultrasound and 0.2 mol/L of concentration of EDTA. Under the optimized condition, the impurities elements in the ion membrane are almost completely removed. The ion membrane capacity (IEC) of the regenerated ion membrane can reach up to 80%-85% of the new one. The SEM results show that, there are many holes detected on the membrane. It requires to be regenerated for further application. The perfluo-sulfonate acid ionic membrane after chemical regeneration can be recyclable for perfluo-sulfonic acid resin. Source

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