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H. Asilian M.Sc. Ph.D. Sh. Moradian fard M.Sc. A. Rezaei M.Sc. Ph.D. S. B. Mortazavi M.Sc. Ph.D. A. Khavanin M.Sc. Ph.D. 《International Journal of Environmental Science and Technology》2006,3(2):153-157
In this study acrylic water base color was removed from synthetic wastewater using coagulation process. Experiments were conducted on the sample containing 100 mg/L and 400 mg/L of acrylic water base color. Destruction of color by means of coagulation/flocculation techniques using ferrous sulfate, alum, lime and polyelectrolyte (cationic, anionic and non ionic). The study was performed in a systematic approach searching optimum values of alum and FeSO4 concentration, pH and temperature. All the experiments were run in a laboratory scale.The obtained results show that treatment with alum and ferrous sulfate alone proved to be very effective in removing the color (> 99 %) and part of COD (60–70 %) from aqueous solution. Lime alone did not significant change on COD and color removal. 相似文献
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Mahmoud Behnia Ahmad Rahmani Shahraki Zabihallah Moradian 《Geotechnical and Geological Engineering》2018,36(4):1975-1989
Many surface and underground structures are constructed in heterogeneous rock formations. These formations have a combination of weak and strong rock layers. Due to the alternation of the weak and strong layers, selecting the equivalent and appropriate geomechanical parameters for these formations is challenging. One of these problems is choosing the equivalent strength (i.e., uniaxial compressive strength) of intact rock for a group of rocks. Based on the volume of weak and strong parts and their strength, the equivalent strength of heterogeneous rocks changes. Marinos and Hoek (Bull Eng Geol Environ 60(2):85–92, 2001) presented the “weighted average method” for defining the uniaxial compressive strength (UCS) of heterogeneous rock masses based on the volume of weak and strong parts. Laubscher (1977) used the volume ratio of the strength of a weak part to a strong part (UCS weak/UCS strong) to determine the equivalent strength. In this study, the two methods are compared and their validity is evaluated by experimental data and numerical analyses. The geomechanical parameters of two heterogeneous formations (Aghajari and Lahbari) in the west of Iran were estimated using these methods. The results of the present study obtained through numerical analyses using particle flow code are compared with those of previous studies and discussed. Laboratory and numerical results show UCS decrease and approach to weak strength with an increasing in volume of weak part. When strength ratio of strong to weak rock increase, equivalent strength decrease more severely. The findings show that Laubscher’s method gives more appropriate results than the weighted average method. 相似文献
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Summary Spectacular large (3 cm) euhedral trapezohedra composed of single crystals of analcime or aggregates of pumpellyite occur in three stratigraphically adjacent phonolitic lavas from Aghda. The trapezohedra contain concentrically arranged inclusions of plagioclase, pyroxene, titanomagnetite and apatite which are fresh in the analcime but extensively altered in the pumpellyite. The analcime crystals are remarkably homogeneous in composition and are interpreted as having formed by ion-exchange pseudomorphous replacement of primary leucite. In the lower phonolite, however, the analcime became unstable and was replaced by pumpellyite which has a wide compositional range, reflecting variable input of Fe, Mg, Ca and Al from the precursor analcime and alteration of inclusions. The occurrence of analcime and pumpellyite at Aghda is indicative of zeolite facies conditions with low fCO
2and H2O activity and probably high Pfluid.
With 5 Figures 相似文献
Große pseudomorphe Trapezoeder von Analcim im Pumpellyit nach Leuzit, Aghda-Gebiet Zentraliran
Zusammenfassung Ungewöhnlich große idiomorphe Trapezoeder, die aus einzelnen Kristallen von Analcim oder aus Aggregaten von Pumpellyit bestehen, kommen in drei stratigraphisch benachbarten phonolitischen Lagen von Aghda vor. Die Trapezoeder enthalten konzentrisch verteilte Einschlüsse von Plagioklas, Pyroxen, Titanomagnetit und Apatit, die im Analcim frisch, im Pumpellyit jedoch intensiv umgewandelt sind. Die Analcim-Kristalle sind von bemerkenswerter Homogenität in ihrer Zusammensetzung und werden auf pseudomorphe Verdrängung von primärem Leucit durch Ionenaustausch zurück-geführt. Im unteren Phonolit ist der Analcim jedoch instabil geworden, und wurde durch Pumpellyit ersetzt, der ein weites Spektrum von Zusammensetzungen erkennen läßt und auf variierende Zufuhr von Fe, Mg, Ca, and Al vom Vorläuferanalcim und auf Umwandlung von Einschlüssen hinweist. Das Vorkommen von Analcim und Pumpellyit bei Aghda ist ein Hinweis auf Zeolithfazies-Bedingungen mit niedrigen fCO 2 und H2O und hohem Pfluid.
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At a glance of its stratighraphy, the Taftan Volcano can be classified as three groups： pre-, syn- and post-volcanic deposits. The pre-volcanic deposits consist mostly of flysch facies and colored mélange complex. The syn-volcanic deposits are mainly the product of the Taftan Volcano which is mostly composed of pyroclastic and lava flows from the main body of this volcano. The post-volcanic deposits are mostly epiclastic and reworked materials from the Taftan Volcano due to its erosion and weathering. Major and trace elements, and Sr/Rb isotopic compositions determined on whole-rock samples from the Taftan Volcano showed that the volcano was formed at the continental margin. The whole-rock isotopic composition of the Taftan Volcano showed a feature of strong enrichment with ^87Sr/^86Sr=0.705326-0.705921. Geochronological samples of the Tartan Volcano determined by the ^40K/^40Ar method gave an age range of 6.95±0.72 to 0.71±0.03 Ma. The rare-earth element patterns are characterized by high LREE and nearly strongly linear patterns for MREE to HREE, suggesting that distinctive minerals such as olivine and pyroxene crystallized in the early magmatic stage and then were involved in reaction between the lower crust and residual magma. The integrated isotope and trace element systematics and tectonic structure beneath the Taftan Volcano suggested the lower-crust assimilation by the primary magma. The primary magma had generated from a heterogeneous mantle source and a secondary petrogenetical process. This magma could have been affected by the subduction of the Oman Sea undemeath the continental Eurasia plate. 相似文献
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