Effect of Iron-Carbon Micro-Electrolysis-Fenton on the Dewatering Performance of Sludge

In this paper, combined with iron-carbon micro-electrolysis-Fenton method, the sludge was adjusted, and the cracking performance and dewatering performance of the sludge were studied. Single factor experiments show that when the amount of iron powder is 1.2 g/L, the reaction time is 45 min, H₂ O ₂When the dosage was 4.2 g/L, the protein and polysaccharide content in the sludge decreased by 46.8 and 20.6, respectively. Compared with the original sludge %. Compared with the original sludge, the COD of the supernatant of the solution increased by 10.1%. The minimum moisture content of the treated sludge cake was 69%, and the SRF value was significantly reduced.The lowest value is 2.687×10 ¹² m/kg. During the micro-electric dust removal sludge, the Fe ²⁺can form a Fenton reagent with H₂ O ₂, thereby reducing the amount of additional iron powder that needs to be added in the conventional Fenton reaction. Three-dimensional fluorescence spectroscopy analysis showed that the humic acid and fulvic acid in the supernatant of the iron-carbon micro-electrolysis-Fenton conditioning solution increased more than after single electrolysis, indicating that the dehydration performance of the sludge was better.The Fenton reagent is formed , thereby reducing the amount of iron powder that needs to be added extra in the conventional Fenton reaction.

Experimental continuous sludge microwave system to enhance dehydration ability and hydrogen production from anaerobic digestion of sludge

Dehydrating large amounts of sludge produced by sewage treatment plants is difficult. Microwave pretreatment can effectively and significantly improve the dewaterability and hydrogen production of sludge subjected to anaerobic digestion. The aim of this study was to investigate the effects of different microwave conditions on hydrogen production from anaerobic digestion and dewaterability of sludge. Based on an analysis of the electric field distribution, a spiral reactor was designed and a continuous microwave system was built to conduct intermittent and continuous experiments under different conditions. Settling Volume, Capillary Suction Time, particle size, and moisture content of the sludge were measured. The results show that sludge pretreatment in continuous experiments has equally remarkable dehydration performance as in intermittent experiments; the minimum moisture content was 77.29% in the intermittent experiment under a microwave power of 300W and an exposure time of 60sec, and that in the continuous experiment was 77.56% under a microwave power of 400W and an exposure time of 60sec. The peak measured by Differential Scanning Calorimeter appeared earliest under a microwave power of 600W and an exposure time of 180sec. The heat flux at the peak was 4.343W/g, which is relatively small. This indicates that microwave pretreatment induced desirable effects. The maximum yield of hydrogen production was 7.967% under the conditions of microwave power of 500W, exposure time of 120sec, and water bath at 55°C. This research provides a theoretical and experimental basis for the development of a continuous microwave sludge-conditioning system.