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Sewage sludge disintegration by high-pressure homogenization: A sludge disintegration model

Journal of Environmental Sciences 2012年第5期24卷 814-820页

作者： Yuxuan Zhang Panyue Zhang panyue_zhang@*** Boqiang Ma Hao Wu Sheng Zhang Xin Xu Beijing Key Laboratory for Source Control Technology of Water Pollution Beijing Forestry University Beijing 100083 China

High-pressure homogenization （HPH） technology was applied as a pretreatment to disintegrate sewage sludge. The effects of homogenization pressure, homogenization cycle number, and total solid content on sludge disintegration were investigated. The sludge disintegration degree （DDCOD）, protein concentration, and polysaccharide concentration increased with the increase of homogenization pressure and homogenization cycle number, and decreased with the increase of sludge total solid （TS） content. The maximum DDCOD of 43.94% was achieved at 80 MPa with four homogenization cycles for a 9.58 g/L TS sludge sample. A HPH sludge disintegration model of DDCOD= kNaPb was established by multivariable linear regression to quantify the effects of homogenization parameters. The homogenization cycle exponent a and homogenization pressure exponent b were 0.4763 and 0.7324 respectively, showing that the effect of homogenization pressure （P） was more significant than that of homogenization cycle number （N）. The value of the rate constant k decreased with the increase of sludge total solid content. The specific energy consumption increased with the increment of sludge disintegration efficiency. Lower specific energy consumption was required for higher total solid content sludge.

关键词： high-pressure homogenization sludge disintegration homogenization pressure homogenization cycle number total solid content

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Main Pathways in Primary sludge disintegration by Sonication and Enhancement of Sonication

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Journal of Donghua University(English Edition) 2017年第1期34卷 21-26页

作者：王琦汤曼琳田晴李方杨波 College of Environmental Science and Engineering Donghua University Shanghai 201620 China

The main pathways of primary sludge(PS)ultrasonic disintegration were analyzed at the sonication frequency of 20 kH z and the thermal effect on PS disintegration was *** adding Na HCO3as a scavenger to entrap the free hydroxyl radicals,cavitation contributed to 82.91%of the total sonication *** power consumed by temperature rising accounted for more than40%of ultrasound power input at the power density of 0.215 W/m L and the sonication time of 10 *** the thermal insulation of polyfoam coating during sonication,a 18.37%of soluble chemical oxygen demand(SCOD)increment was *** the process of pre-heating the PS before sonication,64.15%of SCOD increment was *** with the particle size of 13.77μm for the sonicated PS,the sludge mean particle size decreased to 12.83 and11.98μm by applying polyfoam coating and pre-heating the PS to enhance the cavitation and thermal *** suggested that if thermal energy consumption was relieved during the sonication process of PS,more energy could be used to disintegrate the sludge.

关键词： primary sludge(PS) ultrasonic temperature effect sludge disintegration sludge deagglomeration

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Waste sludge disintegration, methanogenesis and final disposal via various pretreatments: Comparison of performance and effectiveness

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Environmental Science and Ecotechnology 2021年第4期8卷 119-129页

作者： Haiyang He Xiaodong Xin Wei Qiu Dong Li Zhicen Liu Jun Ma State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Department of Environmental Science and Engineering Huaqiao UniversityXiamen361021China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlSchool of Environmental Science and EngineeringNanjing University of Information Science&TechnologyNanjing210044China School of Geosciences The University of EdinburghEdinburghEH89JUUK

This study compared the three wastewater pretreatments of ozonation,Fe2þ-S2O82and freeze-thawing(F/T)in the disintegration,anaerobic digestion(AD)and final disposal of the *** F/T pretreatment increased the dewaterability and settleability of the sludge by 7.8%and 47.1%,*** ozonation pretreatment formed more volatile fatty acids(VFAs),with a peak value of 320.82 mg SCOD/L and controlled the release of *** Fe2þ-S2O82pretreatment removed heavy metals through the absorption and flocculation of ferric particles formed *** the anaerobic digestion of the sludge,the ozonation pretreatment accelerated the hydrolysis rate(k)rather than the biochemical methane potential(B0)of the sludge due to the high VFA content in the ***,the F/T pretreatment facilitated the B0 with great economic efficiency by enhancing the solubilisation of the *** Fe2þ-S2O82pretreatment decreased the methane production,the ferric particle was a unique advantage in the disintegration and harmless disposal of the *** digested sludge had more VFAs after ozonation pretreatment,which contributed to the recycling of *** addition,the lower sludge volume could save the expense of transportation and disposal by ozonation *** pretreatments had different *** comparative study provided information allowing the selection of the type of pretreatment to achieve different objectives of the treatment and disposal of sludge.

关键词： sludge disintegration Anaerobic sludge digestion Effectiveness comparison Different pretreatments

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Compared effects of “solid-based” hydrogen peroxide pretreatment on disintegration and properties of waste activated sludge

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Chinese Chemical Letters 2022年第3期33卷 1293-1297页

作者： Hai-Chao Luo Wan-Qian Guo Qi Zhao Hua-Zhe Wang Nan-Qi Ren State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China

The effects of two solid-based hydrogen peroxides sodium percarbonate(SPC) and calcium peroxide(CP)on waste activated sludge(WAS) disintegration were investigated. Both oxidants achieved efficient WAS disintegration for the synergistic effect of alkaline and oxidation. The strong alkaline condition led to the leakage of ammonia and the existence of abundant calcium ions accelerated the fixation of phosphorus via precipitation in CP WAS disintegration process. However, the spongy-like layer and low p H condition retarded the release of gaseous ammonia in SPC group. Hydroxyl radical was the main oxygen reactive species in SPC approaches which were more intense than CP by electron spin resonance(ESR) *** treated WAS contented more small particle size matter and total suspended solids(TSS) increased dramatically. In conclusion, CP pretreated sludge was more suitable for fertilization, while SPC was in favor of anaerobic digestion. This study clarified the differences between these two oxidants and their intermediates on nutrients release in sludge disintegration.

关键词： Waste activated sludge “Solid-based”hydrogen peroxide Oxygen reactive species sludge disintegration Nutrients release

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