2019-Sustainable Industrial Processing Summit
SIPS2019 Volume 4: Kozlov Intl. Symp. / Sustainable Materials Recycling Processes and Products
| Editors: | F. Kongoli, S.V. Alexandrovich, D.V. Grigorievich, L.L. Igoryevich, I. Startsev, T.A. Vladimirovich |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2019 |
| Pages: | 193 pages |
| ISBN: | 978-1-989820-03-2 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Technology of Waste Water Purification with Extraction of Valuable Components and Implementation of Closed-Loop Water Circulation System
Oxana Fatkhutdinova1; A. Panshin2; Pavel Kozlov3;1CHELYABINSK ZINC PLANT, Chelyabinsk, Russian Federation; 2LLC "UMMC-HOLDING", Verkhnyaya Pyshma, Russian Federation; 3UMMC-HOLDING, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 145
Topic: 7
Abstract:
This paper discusses the results of the research carried out on the pilot zinc production wastewater treatment unit. The first stage of the pilot trials is chemical treatment of wastewaters (using reagents) and their concentration on the reverse osmosis unit. Deficiency of sulphurous zinc materials shows the need to engage recycled material in processing. During the recycling process, secondary raw materials are cleaned from impurities derived by sewage. Chlorides, sulfates and sodium fluorides are the main impurities removed by sewage. Standard limestone technology of wastewater treatment doesn't allow the possibility to remove the foregoing soluble impurities from the wastewaters. Return of wastewaters to the process isn't possible due to the harmful effect of sulphates, chloride, and fluoride on the process of zinc extraction.
Developed technology of the wastewater treatment allows use of the purified water in industrial production and directs the concentrate acquired from reverse osmosis to evaporation.
Optimal conditions and parameters of the following processes are defined:
- Chemical treatment of wastewater (adding reagents): рН = 11.3-11.6; residual hardness-less than 1.0 meq/l; heavy metals precipitation degree comprises 93-98.9%;
- Ultrafiltration: transmembrane pressure - 0.6 bar, partition coefficient - 85%; filtration rate - 375 l/m2h; filtrate turbidity - 0,6 NTU;
- Reverse osmosis: concentration of soluble salts using two-stage reverse osmosis (in the concentrate) is 2.27 mg/dm3 (at pressure on the 1st stage is 48-52 bar, on the 2nd _ 60-64 bar), total concentration of salts in the permeate is 27.4 mg/dm3
Keywords:
Metal; Recycling; Technology; Wastes; Zinc;References:
[1] Gvozdev V.D., Ksenofontov B.S., Purification of industrial wastewaters and utilization of sediments. Moscow: Chemistry, 1988. 111 p.[2] Frog B.N., Levchenko A.P., Water Preparation: tutorial for universities. Moscow: Publishing House of Moscow State University, 1996. 680 p.
[3] Technical Reference Book on Water Processing: in two volumes: translated from French. Saint Petersburg. 2007.1696 p. (in Russian).