Tag:sodium aluminate

№11|2012

POTABLE WATER SUPPLY

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UDC 628.161.3

FESENKO L. N., Ignatenko S. I., Fedotov R. V.

Desiliconization of drinking water by modified media filtration

Summary

A brief evaluation of water desiliconization technologies is given. The results of experimental investigations of eliminating silicic acid compounds from water by deposition on aluminum and iron hydroxides, contact coagulation in a granular bed and modified media filtration are presented. Activated aluminum oxide filtering media modified with 0.5% sodium aluminate solution attains twice as much sorption capacity (compared to media regeneration with alkali) in relation to orthosilicates. Herein 95–97% desiliconization efficiency is ensured alongside with simultaneous reduction of water hardness. Non-waste technology of underground water desiliconization with modifying chemical reuse and generation of crystalline dewatered alumosilicate used in ceramics production as process wastes was developed.

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№9|2020

DRINKING WATER SUPPLY

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UDC 628.161.3

Fedotov R. V.

Removal of silicon compounds from underground water by filtration through a modified media

Summary

A brief analysis of water desiliconization technologies is given. The results of experimental studies on the removal of silicic acid compounds from water by filtration through a modified media are presented. It is shown that the use of a filtering media made of activated alumina modified with 0.5% sodium aluminate solution acquires a sorption capacity twice as high as the media regenerated with alkali in relation to orthosilicates, and provides for 95–97% water desiliconization while reducing in-parallel the water hardness. The sorption capacity of the modified activated alumina in relation to silicon is 16kg in terms of SiO2 per 1 m3 of sorbent, which is twice as much in silicon holding capacity compared with the technology of desiliconization by regeneration of activated alumina with caustic soda. The working exchange capacity of the modified activated alumina in terms of the absorbed total hardness is 300–350 g-eq/m3, which is comparable to sulfonated carbon and KU-1 cation exchanger. A non-waste technology of desiliconization of groundwater with re-using the modifying chemical agent generated in the form of dehydrated crystalline aluminosilicate as a commercial raw material for the production of ceramic products has been developed.

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№11|2011

 

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UDC 628.169.7

Matyushenko A. I., Priimak L. V.

Utilization of fluorine-containing sludge in ground water conditioning

Summary

The results of studying hydroxide fluorine-containing sludge treatment with the purpose of fluorine separation in the form of insoluble compound and regeneration of reduced chemical in the form of sodium aluminate are given. Environmental and economic evaluation of fluorine-containing sludge utilization with account of reduced ground rent for sludge beds and sludge disposal fee evidenced the high efficiency of the proposed flow diagram.

Key words

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