Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching

Wong, Jonathan W C; Zhou, Jun; Kurade, Mayur B.; Murugesan, Kumarasamy

doi:10.1016/j.biortech.2014.10.099

Cited by 67 publications

(31 citation statements)

References 32 publications

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“…It has been indicated that the breakage of flocs has a crucial effect on dewatering sludge under acidification condition (Wong et al ). During bioleaching, the addition of ferrous ion (Fe 2+ ) not only affected sludge pH, but also played a role in neutralizing the negative charge of sludge flocs.…”

Section: Resultsmentioning

confidence: 99%

“…Besides, it is superior to destructing pathogens and controlling sludge odour (Benmoussa et al ; Filali‐Meknassi et al ). In recent years, the potential of bioleaching to improve sludge dewaterabilty has been demonstrated (Liu, Zhou, et al ; Huo et al ; Zhou et al ; Wong et al ; Liu et al ; Mohammadi et al ). Its treatment efficiency is jointly affected by extracellular polymeric substances (EPS), pH, Fe 3+ concentration, particle size and microbial composition (Li ; Li & Yang ; Huo et al ; Liu et al ).…”

Section: Introductionmentioning

confidence: 99%

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Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Liu

Zhang

et al. 2018

Water & Environment J

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In view of the merits of bioleaching and surfactant for sludge treatment, the possibility of surfactant with bioleaching pretreatment applied to improve sludge dewaterability was investigated in this work. The results showed that cetyl trimethyl ammonium chloride (CTAC) with bioleaching pretreatment was highly efficient in dewatering sludge. The optimal CTAC dosage and bioleaching pH for this combination were 120 mg/g (dry solids) and 3.55, respectively, under which the water content of filtrated cake was 68.94% and the specific resistance to filtration was 0.12 × 1013 m/kg with a reduction of 94.92%. Although CTAC and bioleaching both had positive effects on sludge dewatering, their combination was more efficient. The significant enhancement of sludge dewaterability was mainly contributed from the breakage and charge neutralization of sludge flocs, and the release of extracellular polymeric substances (EPS). In addition, the positive correlation between supernatant EPS concentration and sludge dewaterability was observed under experimental conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Liu

Zhang

et al. 2018

Water & Environment J

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“…And the level of pH reduction is directly dependent on the amount of ferric or ferrous salts added [46]. The previous study [46] has indicated that both CST and SRF decreased dramatically when pH was adjusted to acidic condition. This means that acidification is a feasible method to improve the sludge dewatering performance.…”

Section: Effect Of Combination Of Ferrous and Ferric Ionsmentioning

confidence: 99%

“…Due to low energy consumption, high separation rate and simple operation process [75], this technology has wide applications in the seawater desalination, landfill leachate treatment and water purification [62]. Many studies [46,81,82] indicated that the dewaterability of activated sludge containing high-suspended solid could be enhanced by FO membrane technology, which provided great results with satisfactory water flux performance and high rejection rate of nutrients.…”

Section: 1 Current Knowledge and Gapsmentioning

confidence: 99%

“…Monovalent salts (e.g., NaCl and KCl) are effective to generate high osmotic pressure and provide enough water flux, however, the draw solution recovery increase the cost and reverse salt flux [79]. Hau et al [80] used high charge of EDTA as a novel draw solute for dewatering high nutrient activated sludge. The results showed lower salt leakage could be obtained due to larger size of as draw solution to concentrate sludge containing high nutrient, which indicated better performance with high water flux and mitigating reverse salt flux compared with the reference solute NaCl.…”

Section: Applications Of Fo In Wastewatermentioning

confidence: 99%

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Evaluating the dewaterability of waste activated sludge via iron dosing and forward osmosis membrane filtration

Zhang¹

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The activated sludge process has been widely applied in the wastewater treatment for the past 100 years because of its high efficiency. The water content in waste activated sludge (WAS) accounts for over 90% [1], which leads to higher operating costs for disposal and transportation of sludge. However, to-date, the efficiency of the sludge dewateribility remains as a major challenge and progressive research are currently been conducted.To remove the water from WAS, several feasible methods are used in the majority of wastewater treatment plants, which can be categorized as: thickening, stabilization, dewatering, conditioning and disposal [2]. In this study, chemical conditioning by combination of ferrous and ferric ions and forward osmosis (FO) membrane filtration are chosen to increase the sludge dewatering performance due to their advantages of cost-effective and simple operating procedure. Based on the experimental results, both ferrous and ferric ions can enhance the sludge dewaterabilty. However, ferric is verified to be more efficient than ferrous. This is due to the higher charge density of ferric and better bridging properties that provides stronger flocculation for water removal. In addition, Forward osmosis process is not a promising technique for enhancing anaerobic digested (AD) sludge dewaterability. The digestion would break the cell into small substances, which leads to a deteriorative membrane fouling. Although applying iron conditioning and FO process together increases the rejection percentage of nutrients, the water flux performance is still unsatisfactory because of the serious membrane fouling.ii Acknowledge Firstly, I would like to express my gratitude to Dr. Liu Ye, my supervisor always provided me many precious suggestions and helped me in many ways during the whole thesis process. I am so thankful that I can work with her to finish this interesting topic.

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Study of bioleaching under different hydraulic retention time for enhancing the dewaterability of digestate

Gao

Zhu

et al. 2015

Appl Microbiol Biotechnol

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Dewatering of kitchen waste digestate is a key problem to solve so as to increase the application of kitchen waste after anaerobic digestion. In this study, the effects of bioleaching under different hydraulic retention time (HRT = 2, 2.5, and 3 days) on dewaterability of kitchen waste digestate were evaluated. A 12-stage plug flow bioreactor with 180 L working volume was used for digestate bioleaching. The bioleached digestate under different HRTs were collected and dewatered by plate-and-frame filter press. The results showed that the moisture contents of digestate cakes were 67.87 % at 2 days of HRT, 58.06 % at 2.5 days of HRT, and 54.45 % at 3 days of HRT, respectively, indicating the longer the HRT, the lower the moisture content of filter cake. Balanced between the cost and practical need, 2.5 days can be used as the HRT in engineering application. Under the condition of HRT of 2.5 days, the pH, specific resistance to filtration (SRF), capillary suction time (CST), and sedimentation rate of digestate changed from the initial values of 8.08, 210.6 s, 23.4 × 10(12) m kg(-1) and 10 % to 3.21, 32.7 s, 2.44 × 10(12) m kg(-1) and 76.8 %, respectively. Based on the observations above, the authors conclude that bioleaching technology is an effective method to enhance digestate dewaterability and reduce the cost of subsequent reutilization.

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Influence of ferrous ions on extracellular polymeric substances content and sludge dewaterability during bioleaching

Cited by 67 publications

References 32 publications

Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Dewatering characteristics of sludge conditioned by surfactant with bioleaching pretreatment

Evaluating the dewaterability of waste activated sludge via iron dosing and forward osmosis membrane filtration

Study of bioleaching under different hydraulic retention time for enhancing the dewaterability of digestate

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