Purification of transporter-washery water with use of flocculant VPK-402 | Очистка транспортерно-моечной воды с применением флокулянта ВПК-402
2010
Puzanova, L.N. | Ryzhkova, E.P., All-Russia Reseach and Development Inst. of Sugar Industry, Kursk (Russian Federation)
Contaminants of conveyer flume water (CFW) are represented by mechanical impurities of mineral and organic origin (ground, tops, beet roots, septum, skin). Contaminations are condensed at mechanical purification facilities are removed to disposal fields by the hydraulic method. Concurrently, together with the conveyer flume deposit (CFD) up to 250-350% of water are removed from the recycled water system. From mechanical harvesting of sugar beet the contamination of sugar beet increased and on average reaches 15%, whereas settlers at mills are designed for contamination not more than 10%. This results in reducing the effect of water clarification and the degree of condensation of CFD forming thereby the excess of waste water and overconsumption of fresh water for resupply. Condensation of CFD by increasing water return and changing the structure of water phase are stimulated by using coagulants and flocculants. The flocculation ability of the domestic polyelectrolyte VPK-402 both for independent using to clarify CFW and together with lime was studied. The optimum consumption of flocculants is 0.02-0.08% of the weight of suspended substances, in combination with lime the consumption of CFD can be decreased twice. The changes in the conventional technology are introducing the stages of preparing and dosing of the working flocculant solution of in an amount of 0.005% of the weight of suspended substances of a suspension in pump absorbing communication feeding CFW in a vertical settler. An amount of lime milk is fed at the same place. The settling duration in a settle is 45 min. The implementation of the proposed technology will allow reducing the water removal from the system with CFD by 40%, promotes obtaining clarified CFW suitable for recycling with reduced microbiological contamination of sugar beet
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