Abstract

The objective of this study was to investigate the effect of increasing CO₂ concentration on the growth and the capability of Tetraselmis chui. in removal of nitrate, ammonium and phosphate from shrimp pond wastewater (SPWW). The factorial experimental design was used with the treatment of SPWW percentage in culture medium, namely: 100% SPWW, 75% SPWW + 25% Sea Water (SW) and 75% SW + 25% SPWW coupled with three CO₂ concentration treatments: 390 ppm, 550 ppm and 1000 ppm using CO₂ system. Growth of T. chui. for lengh of cultivation period tended to be higher at treatments of 390 ppm CO₂ and 100% SPWW, however there was a declining growth over period of cultivation for both treatments. The growth rate of T. chui was higher for all percentage of SPWW treatments in culture medium at 390 ppm CO₂ concentration compared to other percentage of SPWW treatments and CO₂ concentration treatments. There was a decreasing of growth rate with increasing CO₂ concentration at 100% SPWW and 75% SPWW + 25% SW in culture medium. Nitrogen removal efficiency and removal rate by T. chui. were strongly affected by CO₂ concentration. However, there was no significant effect of increasing CO₂ concentration to removal efficiency and rate of PO₄ by T. chui.

摘要

这项研究的目的是研究增加CO ₂浓度对四合藻生长和能力的影响。去除虾塘废水中的硝酸盐，铵盐和磷酸盐（SPWW）。使用析因实验设计处理培养基中SPWW的百分比，即：100％SPWW，75％SPWW + 25％海水（SW）和75％SW + 25％SPWW以及三种CO ₂浓度处理：390 ppm，550 ppm和1000 ppm（使用CO ₂系统）。翠竹的生长。在390 ppm CO ₂处理下，培养期的持续时间往往更高和100％SPWW，但是两种处理方式在种植期间的增长均呈下降趋势。与其他百分比的SPWW处理和CO ₂浓度处理相比，在390 ppm CO ₂浓度的培养基中所有SPWW处理的百分数T. chui的生长速率更高。随着培养基中100％SPWW和75％SPWW + 25％SW的CO ₂浓度增加，生长速率降低。翠菊的氮去除效率和去除率。受CO ₂浓度的强烈影响。但是，增加CO ₂浓度对去除效率和PO ₄速率没有明显影响。由崔。