Composition and Purification of Wastewater
from the Alkaline Hydrolysis of Rice Shuck
L. A. ZEMNUKHOVA1,2, O. D. AREFYEVA2 and A. A. KOVSHUN2
1 Institute of Chemistry, Far East Branch of the Russian Academy of Sciences Far East Federal University,
Pr. 100-letiya Vladivostoka 159, Vladivostok 690022 (Russia)
2 Far East Federal University,
Ul. Sukhanova 8, Vladivostok 690950 (Russia),
arod@marbio.dvgu.ru
Keywords: rice shuck, alkaline hydrolysis, purification methods, silicon dioxide
Pages: 471–476
Abstract
Alkaline hydrolyzates obtained from rice shuck processing were investigated. Results of the purification of alkaline hydrolyzates by means of coagulation, neutralization with the release of silicic acid, and sorption are presented. It is demonstrated that the purification methods used do not provide the requirements for preliminarily purified and fresh water for use in manufacturing unbleached cellulose with respect to the main hydrochemical parameters (coloration, mineralization, pH). It is established that alkaline hydrolyzates can be utilized with the formation of amorphous silicon dioxide which has a broad range of applications.
UDC 542.06:628.386:633.258
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