First Data on Variations in the Contents of Macro- and Microelements and Precious Metals in Vertical Sections in Industrial Wastes of the Fiagdon Tailing Dump (Republic of North Ossetia–Alania)

2019 ◽  
Vol 487 (1) ◽  
pp. 782-785
Author(s):  
A. G. Gurbanov ◽  
O. A. Bogatikov ◽  
A. B. Leksin ◽  
V. M. Gazeev ◽  
O. A. Gurbanova ◽  
...  
2019 ◽  
Vol 487 (1) ◽  
pp. 69-72
Author(s):  
A. G. Gurbanov ◽  
O. A. Bogatikov ◽  
A. B. Leksin ◽  
V. M. Gazeev ◽  
O. A. Gurbanova ◽  
...  

The new data published firstly obtained by quantitative methods (XRF and ICP MS) on the terms of the average content of macro- and microelements in industrial wastes of the Fiagdon tailing dump exceed the data used for calculation of the metals reserves stored in tailing pond. While elevated content of precious metals, especially Platinum, revealed for the first time. This makes more attractive measure from an economic point of view. The development of a method for the complete utilization of waste, with the extraction of economically valuable and environmentally hazardous elements.


2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Norasikin Othman ◽  
Chan Kit Hie ◽  
Chiong Tung ◽  
Hanapi Mat ◽  
Masahiro Goto

The recovery of precious metals such as silver from photographic wastes is required in order to save raw materials and to protect the environment from dispersed compound, especially heavy metals. For that matter, several technologies have been used such as precipitation, electrolytic, and ion exchange processes which offer some advantages as well as drawbacks over others. Recently, emulsion liquid membrane extraction has been recognized to be a potential process for industrial wastes treatment and recovery of heavy metals. This process has the ability to selectively separate and rapidly concentrate metals through its very thin layer liquid membrane which has a large interfacial area. An attempt was made to recover silver from liquid photographic wastes using tetramethylthiuram disulfide as a mobile carrier. The important variables affecting the emulsion liquid membrane (ELM) process including residence time, surfactant concentration, carrier concentration, level of agitation and phase ratio between emulsion and feed phase were investigated. The results showed that tetramethylthiuram disulfide is selective towards silver (>80%) compared to other metals in the photographic waste. The highest silver extraction is obtained using 0.05 M tetramethylthiuram disulfide, 3% (w/v) Span 80, 300 rpm stirring speed, 1.0 M thiourea in 0.1 M HCl stripping agent, 1:3 of treat ratio, and toluene as the diluent.


2002 ◽  
Vol 46 (1-2) ◽  
pp. 333-336 ◽  
Author(s):  
N. Noda ◽  
S. Yoshie ◽  
T. Miyano ◽  
S. Tsuneda ◽  
A. Hirata ◽  
...  

The wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of acids such as nitric acid and of salts. Biological nitrogen removal from this wastewater was attempted by using a circulating bioreactor system equipped with an anoxic packed bed or an anoxic fluidized bed and an aerobic three-phase fluidized bed. The system was found to effectively remove nitrogen from the diluted wastewater (T-N; 1,000–4,000 mg litre−1). The microbial population structure of activated sludge in an anoxic reactor was analyzed by denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S ribosomal DNA (rDNA) fragments. DGGE analysis under different operating conditions demonstrated the presence of some distinguishable bands in the separation pattern, which were most likely derived from many different species constituting the microbial communities. Furthermore, the population diversity varied in accordance with the nitrate-loading rate, water temperature and reactor condition. Some major DGGE bands were excised, reamplified and directly sequenced. It was revealed that the dominant population in the anoxic reactor were affiliated with the β subclass of the class Proteobacteria.


2002 ◽  
Vol 46 (11-12) ◽  
pp. 93-98 ◽  
Author(s):  
S. Yoshie ◽  
N. Noda ◽  
T. Miyano ◽  
S. Tsuneda ◽  
A. Hirata ◽  
...  

The metallurgic wastewater generated from the processes of recovering precious metals from industrial wastes contains high concentrations of nitrogen compounds such as ammonia and nitric acid and of salts such as sodium chloride and sodium sulfate. Biological nitrogen removal from this wastewater was attempted by a circulating bioreactor system equipped with an anoxic packed bed and an aerobic fluidized bed. The anoxic packed bed of this system was found to effectively remove nitrite and nitrate from the wastewater by denitrification at a removal ratio of 97%. As a result of denitrification activity tests at various NaCl concentrations, the sludge obtained from the anoxic packed bed exhibited accumulation of nitrite at 5.0 and 8.4% NaCl concentrations, suggesting that the reduction of nitrite is the key step in the denitrification pathway under hypersaline conditions. The microbial community analysis by denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S ribosomal DNA (rDNA) fragments revealed that the community diversity varied in accordance with water temperature, nitrate-loading rate and ionic strength. When particular major DGGE bands were excised, reamplified and directly sequenced, the dominant species in the anoxic packed bed were affiliated with the beta and gamma subclasses of the class Proteobacteria such as Alcaligenes defragrans and Pseudomonas spp., respectively.


Author(s):  
А.Г. Гурбанов ◽  
А.Б. Лексин ◽  
В.М. Газеев ◽  
О.А. Гурбанова ◽  
А.Б. Лолаев ◽  
...  

Актуальность исследований: выявлены дополнительные доказательства необхо- димости комплексной утилизации захороненных промышленных отходов с предварительным извлечением из них экономически ценных, включая благородные и экологически опасные метал- лы; выявлена высокая степень загрязнения почв в долине р. Хаником-дон. Цель исследований: на основании геохимических данных определить масштабы и степень загрязнения почв на территории, прилегающей к Фиагдонскому хвостохранилищу. В статье, на основании результатов геохимических исследований почв сельхозугодий (огородов) в поселе- ниях Куыртат и Горный Дзуарикау и природных пастбищ (ПП), проведенных количественными методами (РФА и ICP MS), оценены степень и масштабы их загрязнения промышленными отхо- дами, хранящимися в Фиагдонском хвостохранилище. Впервые приведены данные о содержании экономически ценных и экологически опасных элементов в почвах огородов и природных паст- бищ и рассмотрена геохимическая роль почвообразующих аргиллитов нижнеюрского возраста в формировании почв. Показано, что механизм загрязнения почв обусловлен ветровой эрозией поверхностного слоя хвостохранилища, а затем и из катастрофических воронок на его по- верхности. Кроме того, на основании результатов анализов, показавших резко повышенные содержания в аргиллитах базовых металлов (Fe, Cu, Zn, Ba, Pb, As), высказано предположение о наличии еще одного природного источника загрязнения почв ПП – почвообразующих аргилли- тов, так как в процессе длительного формирования в горных условиях почв ПП они вполне мог- ли обогатиться указанными выше базовыми металлами. Подчеркнуто, что наличие высоких концентраций базовых металлов в нижнеюрской аргиллитовой толще дало возможность пред- полагать, что эти металлы могли быть мобилизованы с помощью механизма «конвективной ячейки», согласно латераль-секреционной гипотезе, из черносланцевой толщи аргиллитов с формированием промышленно значимых рудных жильных тел полиметаллических месторожде- ний Кадат и Какадур. Research relevance: revealed additional evidence of the need for complex disposal of buried industrial waste with preliminary extraction of economically valuable, including noble and environmentally dangerous metals; revealed a high degree of soil contamination in the valley of the Khanikom-don river. Research objective based on geochemical data is to determine the extent and degree of soil contamination in the territory adjacent to the Fiagdon tailing dump. In the article, based on the results of geochemical studies with quantitative methods (XRF and ICP MS) of soils of agricultural lands (orchards) in the Kurtat and Mountain Dzuarikau settlements and from natural pastures, estimated the extent and magnitude of contamination by industrial wastes stored in the Fiagdon tailing dump. Data on the content of economically valuable and environmentally dangerous elements in the soils of vegetable gardens and natural pastures are presented for the fi rst time, and the geochemical role of soil-forming mudstones of the lower Jurassic age in the formation of soils is considered. It is shown that the mechanism of soil contamination is caused by wind erosion of the surface layer of the tailing dump, and then from catastrophic craters on its surface. In addition, based on the results of analyses showing sharply increased content of base metals in mudstones (Fe, Cu, Zn, Ba, Pb, As), it is suggested that there is another natural source of soil contamination of NP - soil-forming mudstones. Because during the long-term formation of NP soils in mountain conditions, they may well have been enriched with the above-mentioned base metals. It is emphasized that the presence of high concentrations of base metals in the lower Jurassic mudstone column made it possible to assume that these metals could be mobilized using the "convective cell" mechanism according to the lateral-secretion hypothesis, from the black-shale mudstone column with the formation of industrially signifi cant ore vein bodies of the Kadat and Kakadur polymetallic deposits.


2015 ◽  
Vol 2 (3) ◽  
pp. 26-31
Author(s):  
K. Węglarzy ◽  
Yu. Shliva ◽  
B. Matros ◽  
G. Sych

Aim. To optimize the methane digestion process while using different recipes of substrate components of ag- ricultural origin. Methods. The chemical composition of separate components of the substrate of agricultural by-products, industrial wastes, fats of the agrorefi nery and corn silage was studied. Dry (organic) mass, crude protein (fat) fi ber, loose ash, nitrogen-free exhaust were estimated in the components and the productivity of biogas was determined along with the methane content. These data were used as a basis for daily recipes of the substrate and the analysis of biogas production at the biogas station in Kostkowice. Results. The application of by-products of agricultural production solves the problem of their storage on boards and in open containers, which reduces investment costs, related to the installation of units for their storage. Conclusions. The return on investment for obtaining electric energy out of agricultural biogas depends considerably on the kind of the substrate used and on technological and market conditions.


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