Effects of seawater salinity on nitr

Effects of seawater salinity on nitrite accumulation in short-range nitrification to nitrite as end product

Abstract： The effect of seawater salinity on nitrite accumulation in short-range nitrification to nitrite as the end productwas studied by using a SBR. Experimental results indicated that the growth of nitrobacteria was inhibited and veryhigh levels of nitrite accumulation at different salinities were achieved under the conditions of 25-28 ℃, pH 7.5-8.0, and the influent ammonia nitrogen of 40-70 mg/L when seawater flow used to flush toilet was less than 35%(salinity 12393 mg/L, Cl- 6778 mg/L) of total domestic wastewater flow, which is mainly ascribed to much highchlorine concentration of seawater. Results showed that high seawater salinity is available for short-range nitrificationto nitrite as the end product. When the seawater flow used to flush toilet accounting for above 70% of the totaldomestic wastewater flow, the removal efficiency of ammonia was still above 80% despite the removal of organicsdeclined obviously(less than 60% ). It was found that the effect of seawater salinity on the removal of organics wasnegative rather than positive one as shown for ammonia removal. 作 者： Yu De-shuang    PENG Yong-zhen    ZHANG Kui   作者单位： Yu De-shuang(School of Environmental Engineering and Science, Qingdao University, Qingdao 266071, China)

PENG Yong-zhen(School of Environment and Energy Engineering, Beijing Polytechnic University, Beijing 100022, China)

ZHANG Kui(Pingdingshan Institute of Technology, Pingdingshan 467001, China) 

期 刊： 环境科学学报(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(2)  分类号： X703  Keywords： seawater salinity    short range nitrification-denitrification to nitrite as the end product    nitrite accumulation    organics removal efficiency    ammonia removal efficiency   

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