电气石/H2O2-诱导结晶新技术回收制药废水中磷资源的研究

To solve the problem of low phosphorus removal and recovery efficiencies in the conventional pharmaceutical wastewater treatment processes, a schorl/H2O2 (schorl/hydrogen peroxide, S/HP) catalytic oxidation process coupled with induced crystallization (IC) called S/HP-IC process was developed. In the novel process, firstly，organophosphates was transformed into inorganic phosphate by the S/HP stage, and simultaneously amounts of organic contaminants were removed. Then, the inorganic phosphate was recovered by IC. Compared with the conventional pharmaceutical wastewater treatment methods, including biological and chemical phosphorus removal processes, S/HP-IC has obvious advantages. It could achieve high and stable pollutants removal rates, and the effluent could meet the discharge standard consequently. Moreover, phosphorus from the pharmaceutical wastewater could be recovered and recycled, which complies with the ideas of sustainable development. In this research project, organic pollutant removal and phosphorus recovery performances of S/HP-IC would be investigated. Phosphorus transformation and the degradation pathways of organic pollutants would be analyzed to explain S/HP-IC mechanism. The researches on its application are proposed, including parameters optimization and comprehensive evaluation on the novel process. The above researches would provide theoretical and technological supports for the new phosphorus recovery and advanced treatment process for pharmaceutical wastewater.

针对传统制药废水处理工艺除磷效率低、磷资源难以回收的问题，本项目创新性的提出了将电气石/H2O2催化氧化技术与诱导结晶磷回收技术相耦合的新工艺。该新工艺首先利用电气石/H2O2技术将含磷制药废水中的有机磷转化为无机磷，同时去除大量有机污染物；再通过诱导结晶法回收废水中的无机磷，从而实现磷资源的回收与可持续利用。与含磷制药废水传统的生物除磷和化学除磷处理工艺相比，该新技术不仅可以获得高效稳定的污染物去除效率，满足污水排放达标的要求；而且可以实现磷资源的回收与再利用，提高磷元素循环效率，符合循环经济和可持续发展理念。本项目将研究该新技术对于高磷浓度制药废水中污染物处理效果及磷回收效能，确定不同形态磷之间的转化规律，解析废水中含磷物质的降解途径，阐明工艺除磷机理；优化新工艺的运行参数，评价新工艺效能。从理论研究和应用技术两个方面开发该项新技术，为含磷制药废水的深度处理和磷资源回收提供理论支撑。

针对传统制药废水处理工艺除磷效率低、磷资源难以回收的问题，本项目提出了将电气石/H2O2催化氧化技术与诱导结晶磷回收技术相耦合的新工艺。本项目研究了以下内容：（1）考察了电气石和过氧化氢投加量、初始pH、磷霉素钠初始浓度等对有机磷转化为无机磷效率的影响，并结合动力学方程，计算了相关动力学参数；（2）分析了有机磷的去除机理、降解产物和途径，结果表明：在电气石/H2O2系统中，同时存在催化与吸附过程，且催化对吸附具有促进作用；氧化过程以非均相Fenton为主；氧化产物可能为甲酸和乙酸；（3）考察了诱导结晶对磷的去除效果，对结晶产物进行了表征。结果表明：结晶反应器对磷的去除率可达95%以上，电气石表面被大量的含钙含磷物质覆盖，产物中可能含有羟基磷酸钙和碳酸钙。.通过该项目的研究，发表了7篇论文，其中5篇被SCI、EI收录，1项发明专利获得授权，完成了预期目标。