Characterization and secondary sludge dewatering performance of a novel combined aluminum-ferrous-starch flocculant (CAFS)

Hong, Peng; Zhong, Songxiong; Xiang, Jiangxin; Lin, Qintie; Yao, Chuang; Dong, Jiahua; Yin, Geping; Yao, Kun; Zeng, Siyuan; Zhong, Jie

doi:10.1016/j.ces.2017.08.005

Cited by 41 publications

(14 citation statements)

References 29 publications

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“…Therefore, sludge conditioning before sludge dewatering is particularly important. Conditioning can change the physicochemical properties of the sludge and increase cohesion, the size of the particles, and the efficiency of sludge dewatering [11]. At present, sludge conditioning includes physical, chemical, and microbial conditioning [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Shi

Sun

et al. 2019

Polymers

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Carboxymethyl chitosan (CMCS), acrylamide, and methacryloxyethyltrimethyl ammonium chloride were used as co-monomers to produce a sludge dewatering agent carboxymethyl chitosan-graft-poly(acrylamide-methacryloxyethyltrimethyl ammonium chloride) (CCPAD) by UV-induced graft polymerization. Single-factor experiments and response surface methodology were employed to investigate and optimize the grafting rate, grafting efficiency, and intrinsic viscosity influenced by the total monomer concentration, CMCS concentration, cationic degree, pH value, and illumination time. The structure, surface morphology, and thermal stability of CCPAD were characterized by infrared spectroscopy, hydrogen nuclear magnetic resonance, X-ray diffraction, scanning electron microscopy, and differential thermal-thermogravimetry. The raw sludge with 97.9% water content was sourced from the concentrated tank of a sewage treatment plant and used in the sludge condition experiments. In addition, CCPAD was applied as the sludge conditioner to investigate the effects of cationic degree, intrinsic viscosity, and pH on the supernatant turbidity, moisture content, specific resistance to filtration, and sludge settling ratio. Moreover, the mechanism of sludge conditioning by CCPAD was discussed by examining the zeta potential and extracellular polymeric substance (EPS) content of the supernatant. The sludge dewatering results confirmed that CCPAD had excellent performance for improving sludge dewaterability.

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Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Shi

Sun

et al. 2019

Polymers

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“…Other scholars have also made certain achievements in the comprehensive utilization of aluminum ash. For example, the aluminum ash is used to prepare refractory materials [11,12], steelmaking deoxidizer [13,14], inorganic flocculants [15][16][17], chemical raw materials [18][19][20], and building materials [21,22]. Nevertheless, most of the above applications are in the theoretical and laboratory stages, which have a high production cost, and may cause secondary pollution.…”

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confidence: 99%

Preparation and Performance Optimization of Original Aluminum Ash Coating Based on Plasma Spraying

Zhang

et al. 2019

Coatings

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As an industrial solid waste, the original aluminum ash (OAA) will cause serious pollution to the air and soil. How to reuse the OAA has been a research difficulty. Thus, a method of preparing a plasma spray powder using OAA is proposed. The OAA was hydrolyzed and ball milled, and the flowability of original aluminum ash spray powder (OAASP) was evaluated by the angle of repose. The coating properties were determined via analyzing the microstructure and the phase of the coating, and the effects of plasma spray parameters on the coating properties were investigated by the orthogonal experiment to optimize spray parameters. The results show that the angle of repose of OAASP after granulation was less than 40°, which met the requirements of plasma spraying. When the spraying current was 600 A, the spraying voltage was 60 V, the main gas flow was 33 slpm, and the powder flow rate was 22 g/min, and the prepared original aluminum ash coating (OAAC) had excellent comprehensive performance. After the spraying process parameters were optimized, the microhardness of the coating was 606.54 HV, which is about twice the hardness of the substrate; the abrasion rate was 12.86 × 10−3 g/min; the porosity was 0.16%; and the adhesive strength was 16 MPa. When the amount of Al2O3 added was 50%, the hardness of the coating was increased by 17.61%.

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“…The sludge cake formed by the CAFS had lower compressibility than that of the traditional flocculants. Namely, the CAFS flocculant had a better dewatering efficiency (Peng et al 2017 ). Under the same conditions of pH and dosage as the traditional flocculants, the FCMC and SRF of sludge were 68.10% and 2.12 × 10 12 m/kg, respectively, after sludge dewatering with chitosan-grafting-dimethy ldiallyl ammonium chloride (chitosan-g-DMDAAC).…”

Section: Recent Applications Of Biopolymer-based Flocculantsmentioning

confidence: 99%

Biopolymer-based flocculants: a review of recent technologies

Jiang

Li²,

Tang

et al. 2021

Environ Sci Pollut Res

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Biopolymer-based flocculants have become a potential substitute for inorganic coagulants and synthetic organic flocculants due to their wide natural reserves, environmental friendliness, easy natural degradation, and high material safety. In recent years, with more and more attention to clean technologies, a lot of researches on the modification and application of biopolymer-based flocculants have been carried out. The present paper reviews the latest important information about the base materials of biopolymer-based flocculants, including chitosan, starch, cellulose, and lignin etc. This review also highlights the various modification methods of these base materials according to reaction types in detail. Via the recent researches, the flocculation mechanisms of biopolymer-based flocculants, such as adsorption, bridging, charge neutralization, net trapping, and sweeping, as well as, some other special mechanisms are comprehensively summarized. This paper also focuses on the water treatment conditions, the removal efficiency, and advantages of biopolymer-based flocculants in applications. Further, this review sheds light on the future perspectives of biopolymer-based flocculants, which may make progress in the sources of base materials, modification processes, multi-function, and deepening application researches. We believe that this review can guide the further researches and developments of biopolymer-based flocculants in the future, to develop them with a higher efficiency, a lower cost, more safety, and multi-function for more diversified applications.

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Characterization and secondary sludge dewatering performance of a novel combined aluminum-ferrous-starch flocculant (CAFS)

Cited by 41 publications

References 29 publications

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Synthesis, Characterization, and Sludge Dewaterability Evaluation of the Chitosan-Based Flocculant CCPAD

Preparation and Performance Optimization of Original Aluminum Ash Coating Based on Plasma Spraying

Biopolymer-based flocculants: a review of recent technologies

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