Methods for treating waste waters using sulfidized red mud sorbents
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A red mud and wastewater technology, applied in chemical instruments and methods, water/sludge/sewage treatment, solid adsorbent liquid separation, etc., can solve problems such as unsuccessful red mud
Inactive Publication Date: 2014-10-15
约瑟夫·扬尼切利
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[0011] Therefore, the prior art has not been successful in using red mud for the manufacture of useful adsorbents capable of effectively adsorbing pollutant
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Embodiment 1
[0035] This example illustrates the preparation of red mud. A 1 kg sample of red mud received from the Sherwin Alumina Company of Corpus Christi, Texas was slurried at 15% solids in demineralized water and filtered on a Buchner funnel. The resulting filter cake was reslurried with demineralized water, refiltered, and used as starting material in Example 2. The red mud thus prepared was used in certain subsequent examples as described in detail herein.
Embodiment 2
[0037] This example illustrates the use of hydrogen sulfide (H 2 S) Preparation of sulfide red mud. Washed red mud from Example 1 (100 g) was slurried in demineralized water at 15% solids and the stirred slurry was saturated with hydrogen sulfide for 30 minutes at room temperature. The samples were dried overnight at 100°C and the resulting cake was comminuted.
Embodiment 3
[0039] This example shows the use of H under pressure in a Parr cartridge 2 S to prepare sulfide red mud. The vulcanization procedure of Example 2 was repeated using a laboratory Parr shot. After the slurry was saturated with hydrogen sulfide gas, the bomb was sealed and heated at 100° C. for 4 hours while stirring. The bombs were then cooled, depressurized, and the contents filtered, dried and comminuted.
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Abstract
Sorbents prepared according to the invention useful in remediation of polluted effluents including waste waters and other fluids such as air, the invention is particularly directed to use of sulfidized red muds in treatment of sanitary waste waters to substantially remove or reduce bacterial levels such as fecal coliform as well as phosphates and total dissolved solids (TDS). The sulfidized red mud sorbents of the invention are derived by sulfidation of red mud, a waste product of Bayer processing of bauxite ores, red muds being sulfidized by reaction with sulfidizing agents including H2S, NA2S, K2S, (NH4)2S and CaSX as examples. Sulfidized red muds used according to the invention typically exhibit a sulfur content from about 0.2 to about 10% above residual sulfur in the red mud used as the starting material for preparation of the sulfidized red mud sorbents used in the presently disclosed methods.
Description
[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Application No. 13 / 199,426, filed August 30, 2011, which is a continuation-in-part of U.S. Application No. 12 / 781,965, filed May 18, 2010, which is a continuation-in-part of U.S. Application No. 12 / 781,965, filed May 18, 2010, which is a continuation-in-part of No. 12 / 537,907, filed March 7, now U.S. Patent 7,807,058, which is a division of U.S. Application No. 11 / 277,282, now U.S. Patent 7,763,566, filed March 23, 2006. and patent disclosures are incorporated herein by reference. The disclosure of US Application Serial No. 12 / 796,066, filed June 8, 2010, which is a continuation-in-part of Application Serial No. 11 / 277,282, filed March 23, 2006, now US Patent 7,763,566, is also incorporated herein by reference. technical field [0003] In general, the present invention relates to adsorbents and methods of using said adsorbents in the treatment of fluids, such as waste s...
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