添加氮损失抑制剂对蓝藻泥堆肥质量的影响

对脱水蓝藻进行大型生产性堆肥实验。研究堆肥过程中,氮损失抑制剂过磷酸钙的添加对堆肥物料各类理化性质的影响。研究结果表明,过磷酸钙加入的处理组与未加过磷酸钙的对照组堆制37 d后堆肥物料均可腐熟,且堆肥肥效均符合NY525-2002的相关要求。添加过磷酸钙处理组有机质含量为490 g/kg,全N、全P和全K含量分别为20.75、10.02和11.32 g/kg,总养分含量达到9.77%,堆肥品质明显优于对照处理。同时,在微生物的作用下,对照组中微囊藻毒素MC-RR与微囊藻毒素MC-LR去除率分别达到89.8%与78.3%。值得一提的是,添加过磷酸钙后,MC-RR和MC-LR的去除率得到进一步提高,分别达到了92.96%和100%,较好地保证了蓝藻堆肥农用的安全性,为脱水蓝藻好氧堆肥化提供了可行性依据。

Effect of adding nitrogen loss inhibitor on quality of dehydrated blue-green algae compost

The dewatered blue-green algae composting were investigated in this study through production composting test. The physical and chemical properties of compost product were studied with addition of nitrogen loss inhibitor-calcium superphosphate in compostiong process. The results showed that the composting materials could reach maturity after 37 days for treatment and control group, and the compost fertilizer met the related organic fertilizer standard (NY525-2002). However, the product quality of treatment group with addition of calcium superphosphate was better than the control group, total N, total P, and total K were 490 g/kg, 20.75, 10.02 and 11.32 g/kg, respectively. In addition, during the composting, algae toxin MC-RR and MC-LR removal efficiencies were 89.8% and 78.3%, respectively due to the biodegradation of microorganisms in control group. It is noteworthy that the removal efficiencies of MC-RR and MC-LR presented were further enhanced in treatment group as the corresponding removal rates increased to 92.3% and 100%, respectively, which ensured the security and feasibility of the application of algae compost in agricultural field.