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Title: | Process for purifying wastewater by separating sulphate ion as ettringite with aluminium hydroxylated products recovered from water | Other Titles: | Procedeu de epurare a apelor uzate prin separarea ionului sulfat ca etringit cu produsi hidroxilati ai aluminiului recuparati din apa | Authors: | Dinu, Laurentiu Razvan Cosma, Cristiana Patroescu, Viorel Ion Badescu, Valeriu Bumbac, Costel Pascu, Luoana Florentina Lehr, Carol Blaziu |
Affiliations: | National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND National Research and Development Institute for Industrial Ecology, ECOIND |
Keywords: | Ettringite;Industrial wastewater;Precipitation | Issue Date: | 30-Aug-2016 | Abstract: | The invention relates to a process for purifying usual acidic wastewater such as pit water and industrial wastewater. The process, as claimed by the invention, consists in the recovery of aluminium from wastewater, in one step of semi-selective precipitation, at a pH of 4.5...5.5, as amorphous hydroxylated products, mostly Al(OH)3, reacting in the reaction of ettringite formation, and the utilization of the products obtained thereby for precipitating sulphate ions as ettringite, either only after some intermediary treatment steps which allow the concentration of sulphate ions in the water to be reduced by precipitation as CaSO4 x2H2O up to 1 450...1 750 mg/l, or directly in the ettringite precipitation reaction stage for purifying wastewater polluted with sulphate ions. |
Description: | Patent Assignee Name(s) and Code(s): ECOIND INST NAT CERC DEZVOLTARE ECOLOGIE RO 133716 A0 |
URI: | http://hdl.handle.net/123456789/843 |
Appears in Collections: | Patents |
Files in This Item:
File | Description | Size | Format | Existing users please |
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documentatie RO 131634-A0.pdf | 36.42 kB | Adobe PDF | Request a copy | |
2016 brevet RO131634-A0.pdf | 92.3 kB | Adobe PDF | Request a copy | |
Cerere de brevet Dinu L..pdf | Poster presentation | 1.38 MB | Adobe PDF | Request a copy |
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