Acido solfidrico nella letteratura internazionale

In order to improve H2 utilization efficiency and to reduce energy consumption during the hydrogenotrophic sulfate reduction process, a two-chambered microbial electrolysis system (MES) with a biocathode was constructed. The performance of MES in terms of sulfate removal and the electron utilization was studied. With an applied voltage of 0.8 V, biocathode removed about 109.8 mg x L(-1) of SO4(2-) from the wastewater within 36 h of operation, and average reductive rate reached 73.2 mg x (L x d)(-1). The highest current density obtained from the MES was 50-60 A x m(-3). The total coulomb efficiency achieved in a cycle was (43.3 +/10.7)%, and around 90% of the effective electrons were used by the cathode bacteria for SO4(2-) reduction. During the operation of MES, the major products of SO4(2-) bio-reduction are sulfide and hydrogen sulfide. With an applied voltage of 0.4 V, both the SO4(2-) removal rate and electron output decreased compared with that of 0.8 V; however, the electric charge efficiency obtained by the MES increased and reached 70% when 0.4 V was applied. Meanwhile, ignorable H2 gas was detected at the end of the cycle, indicating bacteria might directly use cathode as the electron donor thus enhanced energy efficiency. The bacteria could use cathode of the MES as electron donor to reduce SO4(2-) effectively, which may provide a new method to lower energy consumption of the hydrogenotrophic sulfate reduction process, making advanced treatment for sulfate containing wastewater more affordable for practical applications (52) Qiang N, Wang HY, Zhao AH, Yuan WX, Tai J, Chen M. [Odor emission rate of municipal solid waste from landfill working area]. Huan Jing Ke Xue 2014 Feb;35(2):513-9. Abstract: Emission rates of volatile organic compounds (VOCs), H2S and odor unit from the surface of a municipal solid waste (MSW) landfill working area were measured with a wind tunnel sampler. The results show that the emission rate of odor from the non-point source of landfill is the function of environmental temperature and surface sweeping velocity. The emission rate measured in the high temperature season can be 6 times higher of that in the low temperature season. Within the experimental range of 0.6-4 m x s(-1) wind sweeping velocity, the emission rate shows a linear relationship with wind sweeping velocity. In summer, the emission rates of VOCs (measured by PID as isobutylene), H2S and odor unit are 385-680 microg x (m(2) x s)(-1), 4-7 microg x (m(2) x s)(-1), and 46.5-136 OU x (m(2) x s)(-1) respectively. The continuous sweeping experiment shows that the emission rate measured with clean air sweeping is the maximum possible emission rate, which needs to be adjusted when it is used to estimate the odor concentration of more than 10 min sample time or an area emission load (53) Marin I, Sokolova A. Redescription of the stygobitic shrimp Troglocaris (Xiphocaridinella) jusbaschjani Birstein, 1948 (Decapoda: Caridea: Atyidae) from Agura River, Sochi, Russia, with remarks on other representatives of the genus from Caucasus. Zootaxa 2014;3754(3):277-98. Abstract: The complete re-description of Caucasian local endemic stygobitic atyid shrimp Troglocaris (Xiphocaridinella) jusbaschjani Birstein, 1948 is firstly presented after its original description given by Dr. Ya. A. Birstein (1948) under the name Troglocaris schmidti jusbaschjani. The species is still known exclusively from the type locality, hydrogen sulfide bathes of the small Agura River, Sochi area, Russian Federation. Remarks on morphology, coloration of both females and males and data on ecology of Troglocaris (Xiphocaridinella) jusbaschjani Birstein, 1948 as well as remarks on morphology of relative congeneric species from Caucassus, Troglocaris (Xiphocaridinella) kutaissiana (Sadowsky, 1930) (type species of the subgenus) and Troglocaris (Xiphocaridinella) fagei Birstein, 1939, are provided. Discussion on the validity of some subgenera within the genus Troglocaris s. str. Dormitzer, 1853 are also presented (54) Wang X, Chen M, Chen X, Ma J, Wen C, Pan J, et al. The effects of acute hydrogen sulfide poisoning on cytochrome p450 isoforms activity in rats. Biomed Res Int 2014;2014:209393.