Abstract
Na2S2O8/CuFe2O4 addition and hydrothermal pretreatment were combined in this paper to ameliorate the dewatering performance (DP) of sludge with specific-resistance of filtration (SRF), time of capillary suction (CST), and water content (Wc) as well as water types investigated. The results shown the synergistic effect between Na2S2O8/CuFe2O4 addition and hydrothermal pretreatment and the DP of sludge reached to the best when the hydrothermal temperature was 150oC, the addition amount of Na2S2O8 was 0.08 mmol/g-VSS and the mass ratio of Na2S2O8/CuFe2O4 was 2.0. Through the analysis of water distribution, it was also demonstrated that the sludge structure was destroyed with the surface moisture released. All the results obtained shown the significant impact of the combined methods on ameliorating DP of sludge and promoting sludge recovery and utilization.
Highlights
With the increase of water consumption caused by the advancement of residents' living standard, sludge as a by-product of sewage treatment has attracted more and more attention
The aim of the current study is to estimate the combined effect of hydrothermal treatment and Na2S2O8/CuFe2O4 magnetic oxidation on the dewatering performance (DP) of sludge with the influence factors like heating temperature, oxidation-catalyst amount and the ratio of Na2S2O8 to CuFe2O4 analyzed by three evaluation indexes, specific-resistance of filtration (SRF), time of capillary suction (CST), and water content (Wc)
The data show that the combined method of hydrothermal treatment and Na2S2O8/CuFe2O4 addition is more effective than the individual processes
Summary
With the increase of water consumption caused by the advancement of residents' living standard, sludge as a by-product of sewage treatment has attracted more and more attention. Based on the principle of "stabilization, innocuity and recycling" proposed in the 13th five-year plan, treatment methods such as composting, natural drying and incineration have been advocated. Usual dewatering methods for surplus sludge in sewage treatment plants are as follows: first add CaO to regulate the sludge properties, and dehydrate with the plate-and-frame filter press. This method is very effective in decreasing the volume of sludge (the moisture content of sludge can be reduced from 99% to about 80%), it still cannot meet the above requirements. It is necessary to pretreat the sludge, so as to further decrease the water content (Wc) of the sludge and meet the requirements of deep dewatering
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