磷酸铵镁沉淀技术回收养殖场废水中磷的研究进展

养殖场废水中含有丰富的磷元素,如果未经处理直接排放会造成大量磷元素的浪费。采用磷酸铵镁沉淀技术可以有效处理并回收废水中的磷元素。通过探索工艺条件发现,当pH值为9.5时,以氯化镁作为镁源,Mg、N、P物质的量比为1.2∶1.2∶1时,以0.5~1.0 mm、2 g的白云石作为晶种可以使磷酸根的去除率实现99%,而磷灰石作为晶种对磷酸根的去除率仅有97.46%,但两种晶种材料都能使处理后的废水水质符合污水综合排放标准,获得的沉淀产物形貌规则且具有很高的经济效益。最后对两种晶种材料进行经济成本核算发现,无论是磷灰石还是白云石,所需的经济成本都相差不大,其中白云石处理废水所需的费用为79.62元,而磷灰石则需要84.53元,说明晶种诱导养殖场废水中磷酸根的回收具有很高的经济性。

Photon Polarizationin Photonic Crystal Fibers under Compton Scattering

Using the quantum invariant theory and unitary transformation means, we study the influences of multi-photon nonlinear Compton scattering on the photon polarization in photonic crystal fibers(PCF). The results show that the photon polarization of the incident photon changes a lot due to scattered optical, and its general geometric phase factor, Hamiton number and evolution operator are definited both by the incident and scattered optical.