生物絮团养殖中水质调控的碳源策略初探

为探讨生物絮团养殖技术中不同碳源补给对水体常规指标的影响,该研究在累积了一定量氨氮、亚硝酸盐氮的鳙鱼养殖水体中分别添加葡萄糖、蔗糖、麦芽糊精、红糖、糖蜜、乙酸钠6种可溶性碳源,分析它们对水体pH值、ρ(溶氧)、ρ(氨氮)、ρ(亚硝酸盐氮)的影响,探讨不同碳源对生物絮团养殖水体质量影响及内在规律。结果表明,蔗糖在养殖水体中转化氨氮和亚硝酸盐氮的效果最佳,乙酸钠次之;葡萄糖和麦芽糊精转化氨氮的效果也较显著,但转化亚硝酸盐氮的效果却明显差于蔗糖;糖蜜转化氨氮和亚硝酸盐氮效果较差,对水体的pH值和ρ(溶解氧)影响也较小;而葡萄糖、蔗糖和麦芽糊精降低水体的pH值和ρ(溶解氧)明显;乙酸钠是该研究所选6种碳源中唯一能升高水体pH值的碳源,其对于ρ(溶解氧)的降低最为剧烈。在6种不同碳源调节碳氮比的生物絮团鳙养殖试验中,蔗糖是最佳碳源选择,从成本角度考虑葡萄糖也具有较高的性价比。

Effects of Different Carbon Sources on the Water of Aristichthys nobilis Richardson Aquaculture by Biofloc

In order to explore the effects of different carbon sources on the water of Aristichthys nobilis Richardson culture by biofloc as well as regular,glucose,sucrose,dextrin,brown sugar and molasses 5 soluble carbon source were added into the water of Aristichthys nobilis Richardson culture containing a certain amount of ammonia nitrogen,nitrite nitrogen to research their effects on pH value,dissolved oxygen,ammonia-nitrogen,nitrite nitrogen value.The results showed that sucrose had the best effect in converting ammonia nitrogen and nitrite nitrogen;glucose and dextrin had significant effect in converting ammonia nitrogen.However,compared with sucrose,glucose and dextrin had bad effect in converting nitrite nitrogen molasses had bad effect in converting ammonia nitrogen and nitrite nitrogen,and had little effect on pH value and dissolved oxygen;glucose,sucrose and dextrin had significant effect in decreasing pH value and dissolved oxygen;brown sugar had good effect in converting nitrite nitrogen,whereas it had little effect in converting ammonia nitrogen.Therefore,sucrose was the best carbon source,and if the cost factor was taken into account,glucose also had a high cost performance.