For the problem as high energy consumption and sludge increment during the municipal sludge management process with advanced oxidation technology of sulfate radical, the <span style="white-space:nowrap;"&...For the problem as high energy consumption and sludge increment during the municipal sludge management process with advanced oxidation technology of sulfate radical, the <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub></span> composite CaO reaction system was set up. Meanwhile, systematical studies had been carried out for coordinated conditioning of municipal concentrated sludge. The scientific process parameters were determined with the help of sludge capillary suction time, sewage sludge moisture content and other core indicators and the effect of traditional polyacrylamide flocculation method, Fenton method and activated persulfate method were compared. The results showed that in the neutral concentrated sludge conditioning, there were outstanding advantages for <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub> </span>composite CaO reaction system compared with Fenton, CPAM, and SO<sup>-</sup><sub style="margin-left:-7px;">4</sub><span style="white-space:normal;"></span> methods and the optimal parameters for dosage were as follows: <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub></span>: 80 - 120 mg<span style="white-space:nowrap;">·</span>g<sup>-1</sup> DS, n(Fe2+):n(SPS) = 0.8:1, CaO: 200 mg<span style="white-space:nowrap;">·</span>g<sup>-1</sup> DS. To achieve similar performance index, the dosage of Fe<sup>2+</sup> per ton for sludge could be reduced by 20%, the loss rate for iron in filtrate was 0.5%, dewatering of sludge by suction filtration was within 50 s and the moisture content for dewatering cake was 53.7%, which significantly improved the economy and practicability of SO<sup>-</sup><sub style="margin-left:-7px;">4</sub> <span style="white-space:normal;"></span>advanced oxidation technology, and the results were expected to form a useful supplement to the popularization and application of SO<sup>-</sup><sub style="margin-left:-7px;">4</sub><span style="white-space:normal;"></span> advanced oxidation technology.展开更多
文摘For the problem as high energy consumption and sludge increment during the municipal sludge management process with advanced oxidation technology of sulfate radical, the <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub></span> composite CaO reaction system was set up. Meanwhile, systematical studies had been carried out for coordinated conditioning of municipal concentrated sludge. The scientific process parameters were determined with the help of sludge capillary suction time, sewage sludge moisture content and other core indicators and the effect of traditional polyacrylamide flocculation method, Fenton method and activated persulfate method were compared. The results showed that in the neutral concentrated sludge conditioning, there were outstanding advantages for <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub> </span>composite CaO reaction system compared with Fenton, CPAM, and SO<sup>-</sup><sub style="margin-left:-7px;">4</sub><span style="white-space:normal;"></span> methods and the optimal parameters for dosage were as follows: <span style="white-space:nowrap;">Fe<sup>2+</sup>/S<sub>2</sub>O<sup>2-</sup><sub style="margin-left:-7px;">8</sub></span>: 80 - 120 mg<span style="white-space:nowrap;">·</span>g<sup>-1</sup> DS, n(Fe2+):n(SPS) = 0.8:1, CaO: 200 mg<span style="white-space:nowrap;">·</span>g<sup>-1</sup> DS. To achieve similar performance index, the dosage of Fe<sup>2+</sup> per ton for sludge could be reduced by 20%, the loss rate for iron in filtrate was 0.5%, dewatering of sludge by suction filtration was within 50 s and the moisture content for dewatering cake was 53.7%, which significantly improved the economy and practicability of SO<sup>-</sup><sub style="margin-left:-7px;">4</sub> <span style="white-space:normal;"></span>advanced oxidation technology, and the results were expected to form a useful supplement to the popularization and application of SO<sup>-</sup><sub style="margin-left:-7px;">4</sub><span style="white-space:normal;"></span> advanced oxidation technology.