超声空化作用于水中天然有机质特性研究

利用超声空化作用去除水中天然有机质(Natural Organic Matter,简称NOM)不会产生消毒副产物.研究了采用低频高功耗率的超声处理富里酸溶液,结果表明:由于超声空化的热解及氧化作用,随着声功率及富里酸溶液浓度的增加,溶液的pH、ORP逐渐减小,溶液的温度、浊度逐渐增加,体系中加入盐酸后能够放大超声作用.作为水中NOM浓度的替代参数,UV<,254>在超声作用下缓慢增加,而总有机碳(TOC)的超声降解符合准一级反应规律,在20min超声作用之后,TOC去除率由21.2%增至31.6%,加入盐酸后,由24.7%增至34.8%.该研究可为超声协同其他工艺进行水处理提供放大设计依据.

Research on the characteristics of natural organic matter during ultrasonic cavitations

Ultrasonic cavitations can remove natural organic matter(NOM)and have no production of toxic by-products.Fulvic acid solution was treated by low frequency-high power sonication in this paper. It has been shown that strong cavitations in aqueous solution cause shock wave and reactive free radicals by the violent collapse of cavitations bubbles. With the increase of sound power and Fulvic acid solution concentration, the pH and ORP of solution decreased gradually, meanwhile the temperature and turbidity of solution increased gradually. Adding hydrochlorid acid in the treatment can amplify ultrasonic cavitations. As the substituting parameters of NOM concentration, UV₂₅₄ increased slowly by ultrasonic cavitations, while the degradation of TOC by ultrasonic cavitations is first-order reaction.The removal rate of TOC increased from 21.2% to 31.6% by ultrasonic cavitations for 20 minutes, and from 24.7% to 34.8% with the addition of hydrochlorid acid This paper provides the initial basis for the scale design of water treatment by ultrasonic combining with other technology.