[Preparation and Application of Magnetic Water Treatment Materials Based on Iron Sludge].

In recent years, solid waste iron sludge (red mud, iron-containing water treatment residues, and iron-rich sludge) has been widely used to remove pollutants in the water environment; however, the difficulty of separating powdered iron sludge from the water environment media makes it impossible to apply it as a water treatment material on a large scale, and preparing iron sludge into magnetic materials that are easy to be separated is one of the effective strategies to solve this bottleneck. According to the existing research on iron sludge-based magnetic materials at home and abroad, the preparation methods of magnetic materials using iron sludge as raw materials are summarized, including a series of methods, including the thermal decomposition method, hydrothermal and solvothermal method, co-precipitation method, reduction roasting method, and carbonization method. Additionally, it is pointed out that the currently commonly used preparation methods are thermal decomposition, hydrothermal and solvothermal, and co-precipitation.

[Lab-scale SNAD Process in Wastewater Treatment Plant].

Outside the municipal waste water treatment plant(WWTP) which located in Mentougou District, Beijing, the effluent of the anoxic/oxic(A/O) phosphorus removal process served as the substrate to operate a completely autotrophic nitrogen removal over nitrite(CANON) filter reactor.. After the reactor was successfully activated, glucose was added to the influent as the organic carbon source.

[Effect of Two-Stage Aeration on Nitrogen Removal Performance of Aerobic Granular Sludge].

Four mini experiments were conducted at different conditions. The heterotrophic microorganisms on the aerobic granular sludge surface consumed organic compounds at the initial stage of aeration. The denitrification rate and the efficiency of NO-N and NO-N removal were relatively low.