冷水性鱼类工厂化养殖中臭氧催化氧化降解氨氮(6)

Removal of ammonia -N from recirculating aquaculture system of cold water fish by ozonation in the presence of bromide

LI U Yo ng ,CAO Guang -bin ,JIANG Shu -yi ,HAN Shi -cheng ,CHEN Zhong -xiang

(Heilong jiang River Fisheries Research Institute ,Chinese Academy of F ishery Sciences ,Harbin 150070,China )

Abstr act :With ozone generator and reaction tower ,the culture w ater with 5mg /L N aBr was fully mixed and the o -zone reacted with ammonia to dec ompose ammonia into N 2.Some experiments were carried out in a recirculating rainbow trout c ulture system with 9.2m 3water and 10kg ·m -3fish density .During water exchange period of 192hours ,the water samples were tested every 24hours to analyze pH and concentrations of DO ,ammonia ,nit rite ,ni -trate ,suspended solids and so on .By the experiments ,the ammonia decomposition capacity and application of o -zonation c ould be determined .The results showed that ozonation c ould effectively decompose the ammonia of aqua -culture water in the presence of bromide ,and the effic iency of decomposition reached 50.11%w hich was approxi -mately higher by 24.31%than direct oxygenated ef ficiency by ozonation .In the experiments ,nitrite and nitrate were accumulated ,and c oncent ration of nitrite decreased to 0.089mg /L on 192nd hour because nitrite was trans -formed into nitrate as the main nitrogen by -product by ozonation .T he pH should be adjusted owing to its gradually desc ending to 5.55on 192nd hour .In this experiment ,the c onditions of DO and suspended solids were suitable for cold water fish .Decomposition of ammonia by ozonation in the presenc e of bromide was beneficial for cold water fish recirculating culture system .

Key words :ammonia ;ozonation ;dec omposition ;bromide

Correspo nding author :CAO G uang -bin .E -mail :hscgb @http://www.77cn.com.cn

《水产科学》杂志2006年征订启事

《水产科学》杂志是由辽宁省水产学会主办的水产科技期刊,1982年创刊,国内外发行。是中文水产、渔业类核心期刊和全国农业系统优秀期刊之一,现已被俄罗斯《文摘杂志》、英国《动物学记录》、《国际农业与生物科学研究中心》、美国《剑桥科学文摘》等收录。国内方面,已被中国科学引文数据库、中国学术期刊综合评价数据库、《中国学术期刊(光盘版)》、中国期刊网和万方数字化期刊群中文科技期刊数据库收录。杂志主要刊载渔业资源、海淡水捕捞、水产养殖与增殖、水产生物病害及防治、水产饲料与营养、水产品保鲜与加工综合利用、渔船、渔业机械与仪器及水产基础科学等方面研究的新进展、新技术、新方法等。设有研究与应用、综述与专论、科普讲座、渔业信息等栏目。读者对象为水产科技工作者,大中专院校水产、生物、环保等专业师生,渔业行政、事业和企业单位有关管理和技术人员及广大知识渔民。欢迎渔业企业刊登广告。

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