关键词: 进口需求, 进口需求, 恒定市场份额模型, 出口竞争力

Abstract:

The circulating aquaculture system always depends on nitrifying bacteria to transform toxic ammonia into nitrate-nitrogen, and this transformation process will reduce the pH of culture water. So it is very important to maintain the pH value. Most of the research about that are just concerned about the theoretical study without specific experiments. We got some water samples form the circulating aquaculture system, titrated these samples by different alkaline reagents. Through comparing with their titration curve, we found that sodium carbonate and sodium bicarbonate are more suitable to control the pH. Besides, we also found that the water in circulating aquaculture has buffering capacity.