Freeze-thaw combined with activated carbon improves electrochemical dewaterability of sludge: analysis of sludge floc structure and dewatering mechanism.

Kai Hui, Lei Song, Zhenzhou Yin, Hongwei Song, Zehao Wang, Wenjian Gao, Lili Xuan

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Article in Environmental science and pollution research international, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

7 authors.

Kai HuiSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Lei SongSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China. songlei2013@imut.edu.cn.ORCID http://orcid.org/0000-0001-5091-217X

Zhenzhou YinSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Hongwei SongSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Zehao WangSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Wenjian GaoSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Lili XuanSchool of Civil Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China.

Funding

National Natural Science Foundation of China (CN) 21107041Natural Science Foundation of Inner Mongolia 2020MS05028

6 · The paper itself

Abstract

Freeze-thaw (F/T) and electrochemistry both are environment-friendly and efficient sludge treatment technologies. In this study, the sludge samples were frozen at - 15 °C, and 20% g/gTss activated carbon (AC) was added to the dissolved sludge. Finally, the uniformly mixed sludge was treated at a voltage of 15 V for 25 min. During the experiment, the effect of F/T on the floc structure was analyzed by a laser particle analyzer and scanning electron microscope. F/T treatment improved the dewatering performance of the sludge and promoted the aggregation of sludge flocs into larger particles either. At the same time, the median diameter (D50) increased from 45.27 to 128.94 μm. AC was added to the thawed sludge solution before electrochemical treatment (EP). The conductivity of AC enhanced the effect of EP, thereby cracking the sludge flocs. Therefore, the three-dimensional excitation-emission matrix (3D-EEM) intensity of tightly bound extracellular polymeric substances (TB-EPS) decreased significantly. The protein in TB-EPS decreased from 54 to 33%, and the D50 was also reduced to 105.3 μm. The final specific resistance of filtration and water content were reduced by 96.39% and 32.17%, respectively. The dehydrated cake elemental analysis showed that increased AC improved the sludge cake's combustion efficiency significantly. Moreover, the preliminary economic analysis indicated that the cost of this research was low, which implied the potential application value of combined treatment.

Indexed as

SewageWaste Disposal, FluidCharcoalExtracellular Polymeric Substance MatrixFiltrationWaterCharcoalSewageWaterCarbon-based materialEconomic analysisElectrochemical pretreatmentExtracellular polymeric substancesFreezing treatmentWaste activated sludge

Identifiers

PMID34731422

DOI10.1007/s11356-021-16837-4

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.