论文部分内容阅读
将不同粒径荔枝核、聚乙烯醇(PVA)和海藻酸钠复合获得多孔固体碳源,对复合碳源的微观形貌、孔隙结构进行表征,并在人工配制的工厂化循环养殖废水中考察了其作为反硝化碳源的释碳速率及脱氮效果。结果表明,扫描电镜显示粒径250μm复合碳源的外表面致密,孔隙较少,而含粒径150μm和粒径75μm荔枝核的复合碳源外表面孔隙较多,内部孔隙发达。脱氮过程中,粒径75μm复合碳源的硝酸盐去除率在第3天可达到100%,无亚硝酸盐积累。粒径150μm复合碳源NO_3~--N去除率逐渐上升至94.71%,NO_2~--N质量浓度则逐渐降低至0.74 mg/L。粒径250μm复合碳源脱氮效果较差,NO_3~--N去除率为30%。粒径75μm和粒径150μm复合碳源孔隙发达,碳源释碳能力强,短时间内硝酸盐去除率高,可作为海水养殖废水反硝化脱氮的固体碳源填料。
Porous solid carbon source was obtained by compounding litchi nucleus, polyvinyl alcohol (PVA) and sodium alginate with different particle size. The morphology and pore structure of the composite carbon source were characterized and investigated in the artificial recycled industrial wastewater As a carbon denitrification source of carbon release rate and denitrification effect. The results showed that the surface of the composite carbon source with 250μm particle size was compact with fewer pores. The composite carbon source with particle size of 150μm and particle size of 75μm had more pores on the outer surface and developed internal pores. During the denitrification process, the nitrate removal rate of the composite carbon source with particle size of 75 μm can reach 100% on the third day without nitrite accumulation. The removal rate of NO_3 ~ --N with 150μm composite carbon source gradually increased to 94.71%, while the NO_2 ~ - N concentration gradually decreased to 0.74 mg / L. The denitrification effect of composite carbon source with particle size of 250μm is poor, and the NO_3 ~ - N removal rate is 30%. The composite carbon source with particle size of 75μm and particle size of 150μm has developed pores with high carbon releasing ability and high removal rate of nitrate in a short period of time. It can be used as solid carbon source for denitrification and denitrification of mariculture wastewater.