Hangzhou Research Institute of China Coal Technology & Engineering Group, Hangzhou 311201, China E-mail:
Hangzhou Research Institute of China Coal Technology & Engineering Group, Hangzhou 311201, China.
Water Sci Technol. 2023 Nov;88(10):2491-2498. doi: 10.2166/wst.2023.366.
In this study, wet oxidation of excess sludge from the caprolactam wastewater treatment process was investigated. The effects of reaction conditions, including sludge concentration, the amount of sludge, reaction temperature and time and the oxygen supply amount, were discussed. The highest removal rates of chemical oxygen demand (COD) and volatile suspended solid (VSS) that can be attained at 78.6 and 89.3% were acquired separately under 260 °C for 60 min with an initial oxygen gas pressure of 1.3 MPa. The sludge was hydrolyzed and oxidized under hydrothermal conditions, producing small molecule organic acids, such as acetic, formic and oxalic acids, as the main products, which could be used as carbon sources for wastewater treatment. These results indicated that wet oxidation provides a favourable and feasible alternative method for the treatment of excess sludge from the coal chemical industry.
本研究考察了湿式氧化法处理己内酰胺废水处理过程中产生的剩余污泥。讨论了反应条件，包括污泥浓度、污泥量、反应温度和时间以及供氧量等对反应的影响。在初始氧压为 1.3MPa、260°C 下反应 60min 时，COD 和 VSS 的去除率分别可达 78.6%和 89.3%。在湿热条件下，污泥发生水解和氧化反应，生成小分子有机酸，如乙酸、甲酸和草酸等，作为主要产物，可作为废水处理的碳源。这些结果表明，湿式氧化为煤化工行业剩余污泥的处理提供了一种可行的替代方法。
