废光盘回收废水的处理方法研究

探讨了混凝和氧化法处理废光盘回收产生的废水。通过试验，探讨了PFS、PAC混凝和Fenton、次氯酸钠氧化的反应条件和对COD的去除效果，并选择了较住的混凝剂和氧化剂，优化两者的组合方式，得出了Fenton氧化＋PFS混凝联合处理废光盘回收废水的方法。此方法的全程COD去除率可达90．3％。     

Fractal Geometry of Particle Aggregates Formed in Calcium Sulfite Slurry

The solid-liquid separation is an important operation for the regenerated slurry of dual-alkali FGD system, and calcium sulfite could predominate in particle aggregates of the slurry. The settling velocity of calcium sulfite particles is a key parameter for the solid-liquid separation design. However, the settling velocity predicted by Stokes' Law could be suitable only for a spherical aggregate, but not for the irregular one. In this work, fractal geometry was introduced in order to characterize highly irregular geometric shapes. The sizes of calcium sulfite particle aggregates were analyzed using a metallographic phase microscope and image analysis. The results showed that particle aggregates had fractal features. The fractal dimensions could reveal the characteristics of the aggregates' geometry and aggregation process. An exponential relation between the fractal dimension D2 and the particle size l was determined as AμlD2. According to fractal theory, a parameter can be used to modify Stokes settling velocity close to actual settling velocity. The results could be valuable for the design of solid-liquid separation processes.     

高负荷厌氧氨氧化反应器的研究进展

剖析了常见的高负荷厌氧氨氧化反应器的构型特点,归纳了颗粒污泥反应器（上流式厌氧污泥床、膨胀颗粒污泥床和气提式反应器）、生物膜反应器和复合式反应器的优缺点。系统总结了高负荷厌氧氨氧化反应器的调控要点,包括操作条件（负荷、回流等）调控、环境条件（pH值、温度、溶解氧等）调控、营养物质（基质比、钙离子浓度、无机碳源等）调控、抑制剂调控和微生物（接种源、优势种、聚集体、生物量和活性等）调控。最后指出,实现高负荷厌氧氨氧化反应器全面应用的关键是突破复杂水质障碍和在低温条件下进行有效调控。     

溶解氧对亚硫酸盐型自养反硝化的影响

亚硫酸盐可代替碳源作为电子供体被脱氮硫杆菌利用进行反硝化,去除水中硝酸盐.亚硫酸钠可作为脱氧剂,在30℃,10.17 mmol/L的亚硫酸钠可在4 min内将水中DO降至0 mg/L.添加相同量亚硫酸钠,半封闭状态下,DO容易上升,稳定周期短,一个周期内硝态氮去除率仅为46.74％;而全封闭状态下,DO可长期稳定在0 ...     

pH对亚硫酸盐型自养反硝化的影响研究

亚硫酸盐自养反硝化是一种新型低碳源含硝废水的处理方法,亚硫酸盐代替碳源作为电子供体被脱氮硫杆菌利用进行硫自养反硝化作用,将水中的硝酸盐去除.亚硫酸盐型自养反硝化进行反应的最佳pH为7～8,pH>8或pH<7时反硝化效果下降,当pH升至8～8.5时加入盐酸将pH调至7～8,可消除pH抑制,恢复污泥活性.本实验结果将为pH...