Coagulation characteristics of electrochemically prepared polyaluminium chloride on humac acid removal from water
The treatment of surface natural water for drinking water production goes through the degradation of humic substances. The increasing demand of more efficient coagulation water treatment, especially regarding the removal of natural organic matter (NOM), has lead to the development of a new category...
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| Dokumentumtípus: | Könyv része |
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SZAB
Szeged
2012
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| Sorozat: | Proceedings of the International Symposium on Analytical and Environmental Problems
17 |
| Kulcsszavak: | Elektrokémia, Víztisztítás |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/76465 |
| Tartalmi kivonat: | The treatment of surface natural water for drinking water production goes through the degradation of humic substances. The increasing demand of more efficient coagulation water treatment, especially regarding the removal of natural organic matter (NOM), has lead to the development of a new category of coagulants, the pre-polymerised inorganic coagulants, such as polyaluminium chloride (PAC). An alternative preparation procedure for PAC (prehydrolyzed aluminium chloride with general formula Alm(OH)nCl3n-m) is presented in this paper. Using the principles of coagulant preparation and of the electrolysis process, the proposed procedure is based on the use a new method for the preparation of electrochemically obtained PAC (E-PAC) in an electrochemical reactor, equipped with plain-plate A1 anodes and stainless steel cathodes, and AICI3 aqueous solution as electrolyte, applied with successfully in our laboratory. Coagulation behaviors of E-PAC and conventional coagulants as alum and commercial product PAC were compared, using the so-called „Jar test" procedure, in accordance with water treatment standards, to remove humic acid (HA) from deionized water with addition of lmg/L of humic acid (commercial HA powder), selected for this study, due to the fact that it is a principal component of humic substances, which are typically the major component of NOM in water supplies. As part of the applied procedures, the level of residual turbidity, the amount of total organic carbon, the UV-254 absorbance and colour were evaluated, in oerder to assess the efficiency of the coagulation process in all situations (PAC, E-PAC and alum as coagulants). The results suggest than the electrochemically obtained E-PAC can be alternatively produced by electrolysis process easily controlled, resulting a product with better properties than the commercial PAC used for comparison to remove humic acid from synthetic water. |
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| Terjedelem/Fizikai jellemzők: | 366-370 |
| ISBN: | 978-963-315-066-5 |