Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes

Ma, Degang; Su, Meizhong; Qian, Jiaru; Wang, Qian; Meng, Fanyi; XiaoMei, Ge; Yu, Ye; Song, Chunfeng

doi:10.1016/j.seppur.2020.116822

Cited by 52 publications

(11 citation statements)

References 61 publications

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“…There are also known processes combining electrokinetic treatment and bioleaching (Xu et al 2017 ). Although the method is simple, it can be used under various conditions (in situ and ex situ), is relatively inexpensive and environmentally friendly, but has not yet found an application on a larger than laboratory scale (Ma et al 2020 ).…”

Section: Problem Of Micropollutantsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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This literature review outlines the most important—agricultural and non-agricultural—types of sewage sludge management. The potential of waste sludge protein hydrolysates obtained by chemical sludge conditioning was reported. The discussed areas include acidic and alkaline hydrolysis, lime conditioning, polyelectrolyte dewatering and other supporting techniques such as ultrasounds, microwave or thermal methods. The legislative aspects related to the indication of the development method and admission to various applications based on specified criteria were discussed. Particular attention was devoted to the legally regulated content of toxic elements: cadmium, lead, nickel, mercury, chromium and microelements that may be toxic: copper and zinc. Various methods of extracting valuable proteins from sewage sludge have been proposed: chemical, physical and enzymatic. While developing the process concept, you need to consider extraction efficiency (time, temperature, humidity, pH), drainage efficiency of post-extraction residues and directions of their management. The final process optimization is crucial. Despite the development of assumptions for various technologies, excess sewage sludge remains a big problem for sewage treatment plants. The high costs of enzymatic hydrolysis, thermal hydrolysis and ultrasonic methods and the need for a neutralizing agent in acid solubilization limit the rapid implementation of these processes in industrial practice. Graphical abstract

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Section: Problem Of Micropollutantsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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“…Electroosmotic dewatering is preferable to traditional dewatering techniques when dealing with low-permeability materials, such as fine soils, sediments, and sludge [7]. The pioneering work conducted by Casagrande to accelerate dewatering in consolidated clay soils with low hydraulic conductivity [8] is a technique that has been successfully applied to industrial applications, including soil consolidation [9,10], remediation of contaminated soils [11][12][13], food engineering [14], the dewatering of sludge [15], residues from metallurgical processes [16][17][18][19], and the nuclear industry [20], among other applications.…”

Section: Introductionmentioning

confidence: 99%

A Network Model for Electroosmotic and Pressure-Driven Flow in Porous Microfluidic Channels

et al. 2022

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In this work, the network simulation method is presented as a tool for the numerical resolution of the electroosmotic and pressure-driven flow problem in microchannels with rectangular and cylindrical geometries. Based on the Brinkman equation for steady flow and constant porosity, the network model is designed using spatial discretization. An equivalent electrical circuit is obtained by establishing an analogy between the physical variable fluid velocity and electric potential. The network model is solved quickly and easily employing an electrical circuit resolution code, providing solutions for the velocity profile in the channel cross-section and the total circulating flow. After simulating two practical cases, the suitability of the grid is discussed, relating the relative errors made in the variables of interest with the number of cells used. Finally, two other applications, one for rectangular geometries and the other for cylindrical channels, show the effects the main parameters controlling the flow in these types of channels have on velocities and total flow: the zeta potential of the soil pores, applied potential and pressure gradients, and the boundary condition modified by the zeta potential in the walls of the channel.

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“…However, McBride and Martinez [19] reported that this practice could conjointly cause an increase of total dissolved organic matter, which in turn could enhance leachability of metals. Different types of processes (chemical, biological and electrochemical) have been proposed to eliminate toxic metals from municipal sewage sludge [24][25][26][27]. Biosolid cleanup is thus a promising tool to minimize contamination of soils and waters.…”

Section: Introductionmentioning

confidence: 99%

Cleanup of sewage sludge spiked with Cd, Cu, and Zn: Sludge quality and distribution of metals in the “soil-plant-water” system

Barraoui

Blais

Labrecque³

2021

Chemosphere

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Heavy metal removal from sewage sludge under citric acid and electroosmotic leaching processes

Cited by 52 publications

References 61 publications

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

A Network Model for Electroosmotic and Pressure-Driven Flow in Porous Microfluidic Channels

Cleanup of sewage sludge spiked with Cd, Cu, and Zn: Sludge quality and distribution of metals in the “soil-plant-water” system

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