|
|
|
| Mariculture Effluent Pretreatment Methods and Screening of Microalgae |
| WANG Wei-wei,CHEN Shu-xiu,QIAN Rui,XU Ning-ning,SUN Juan,ZHANG Zhuang-zhi |
|
|
|
|
Abstract The growth was compared in algae Chlorella spp ., Dunaliella salina , Phaeodactylum tricornutum and Isochrysis zhanjiangensis cultivated in effluents from Atlantic salmon (Salmo salar) mariculture pretreated by different methods including heating ,ozone disinfection and sodium hypochlorite disinfection to screen microalgae for large-scale cultivation ,and to enhance the efficiency of mariculture effluent treatment and recirculating utilization . The results showed that Chlorella spp . showed good growth in the effluents unpretreated and pretreated by the three methods .The other three species of algae were found to grow well in the effluents pretreated by heating and sodium hypochlorite disinfection ,but P .tricornutum ,I .zhanjiangensis and D .salina soon settled or died due to plankton emergence in the ozone disinfection group .The four species microalgae had P removal rate of 76% -99% in the effluents , with the minimal N (nitrate) removal rate (only 28% -59% ) by I .z hanj iangensis .Sodium hypochlorite disinfection led to low N removal (28% -81% ) by the four species of microalgae ,but P removal rates were more than 95% in this group .In conclusion ,mariculture effluents disinfected by sodium hypochlorite is suitable for microalgae grow th , but affect nitrogen removal . According to biomass production and nutrient removal , Chlorella spp . would be good candidate for large-scale cultivation in mariculture effluent .
|
|
Received: 25 March 2014
|
|
|
|
|
|
|
