Disintegration of excess activated sludge by hydrogen peroxide oxidation

Kim, Tak-Hyun; Lee, Sang-Ryul; Nam, Youn-Ku; Yang, Jeongmok; Park, Chulhwan; Lee, Myun-Joo

doi:10.1016/j.desal.2008.06.023

Cited by 83 publications

(41 citation statements)

References 27 publications

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“…Unlike conventional inorganic oxidizing agents such as chlorine and hypochlorite, hydrogen peroxide yields no noxious or polluting byproducts as its only byproducts are water and oxygen (Ayling and Castrantas 1981). Kim et al (2009) studied the effect of combined pretreatment of WAS using alkali-H 2 O 2 combination and reported 49% decrease in TS content and 57.4 and 66.7% improvement in COD solubilization ratio and sludge settleablity (SVI) at pH 11 with 1.6 M H 2 O 2 dosage.…”

Section: Chemical-chemicalmentioning

confidence: 99%

Application of physico-chemical pretreatment methods to enhance the sludge disintegration and subsequent anaerobic digestion: an up to date review

Tyagi

2011

Rev Environ Sci Biotechnol

229

106

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Anaerobic digestion of waste activated sludge (WAS) is most commonly used at wastewater treatment facilities to stabilize the sludge. However, poor biodegradation efficiency of sludge and longer retention times (20-30 days) are the major limitations of anaerobic digestion method, which can be overcome by disintegrate the sludge and make intracellular material readily available to anaerobic biodegradation. Several sludge disintegration techniques (Thermal, chemical and mechanical) and their combinations were studied previously in order to improve the anaerobic digestibility of sludge, reduce the sludge retention time and enhance the production of biogas. However, none of the pretreatment technique shows a real breakthrough in enhancement of anaerobic digestibility of WAS due to associated drawbacks, such as high operational and capital cost, poor sanitization and energy intensive. On the other hand, hybrid pretreatment techniques endow with promising outcomes through neutralizing the associated drawbacks with individual pretreatment techniques. Nevertheless, the research on the application of hybrid pretreatment techniques is in its infant stage, presently. Therefore, the satisfactory research in this direction can lead to policy maker and environmental protection agency to select more robust and sustainable solution for sludge treatment. This review encompasses the up-to-date information about the thermal, chemical and mechanical sludge disintegration techniques (principle, performance at lab, pilot and full scale, advantages and disadvantages). A comparative evaluation of these techniques are also presented in terms of COD solubilization, dewaterability, pathogens removal, lab/pilot/full scale application, capital and, operation and maintenance cost involved and energy requirement.

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Section: Chemical-chemicalmentioning

confidence: 99%

Application of physico-chemical pretreatment methods to enhance the sludge disintegration and subsequent anaerobic digestion: an up to date review

Tyagi

2011

Rev Environ Sci Biotechnol

229

106

View full text Add to dashboard Cite

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“…Nevertheless, alkali treatment generates a series of drawbacks such as corrosion, odors and the need to add a chemical agent and then neutralize it. In addition, the cost of disintegrating sludge through a chemical treatment tends to be more expensive than through physical or biological treatment processes [21]. For this reason, preliminary biological processes are adopted, to minimize sludge production and thus reduce subsequent cost.…”

Section: Introductionmentioning

confidence: 99%

Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments

Ruiz-Hernando

Martinez-Elorza

Labanda

et al. 2013

Chemical Engineering Journal

140

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Sludges resulting from wastewater treatment processes have a characteristically high water content, which complicates handling operations such as pumping, transport and disposal. To enhance the dewatering of secondary sludge, the effect of ultrasound waves, thermal treatment and chemical conditioning with NaOH have been studied. Two features of treated sludges were examined: their rheological behavior and their dewaterability. The rheological tests consisted of recording shear stress when the shear rate increases and decreases continuously and linearly with time, and when it increases and decreases in steps. Steady-state viscosity and thixotropy were obtained from the rheological tests, and both decreased significantly in all cases with increased treatment intensity. Centrifugation of ultrasonicated and thermally treated sludges allowed the total solid content to be increased by approximately 16.2% and 17.6%, respectively. These dewatered sludges had a lower viscosity and thixotropy than the untreated sludge. In contrast, alkali conditioning barely allowed the sludge to be dewatered by centrifugation, despite decreasing its viscosity and thixotropy.

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“…As the pH of sludge sample increased under extremely high pH value of solution, bacterial surfaces were negatively charged, which created high electrostatic repulsion. This causes desorption of extracellular polymers and results in disruption of the sludge cells within certain pressure, therefore, bond water will be released from the cells and the sludge dewaterability improved [37]. As Table 2.2 depicted, experiments carried out at different pH proved that alkaline treatment led to a drier sludge solid cake in final with longer dewatering time [38].…”

Section: Acid-alkaline Treatmentmentioning

confidence: 91%

“…The mechanism of addition of individual oxidant to adjust the activated sludge is that the strong oxidizing ability of the oxidizing agent destroys the organic layer on the surface of the activated sludge floc and also reduces the surface negative charge to weaken the repulsive forces between particles, which are conducive to destabilization and reunion of floc [49,50]. In addition, the oxidant is able to decompose EPS and contribute to rupture of cells effectively [51].…”

Section: Individual Oxidant Additionmentioning

confidence: 99%

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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Disintegration of excess activated sludge by hydrogen peroxide oxidation

Cited by 83 publications

References 27 publications

Application of physico-chemical pretreatment methods to enhance the sludge disintegration and subsequent anaerobic digestion: an up to date review

Application of physico-chemical pretreatment methods to enhance the sludge disintegration and subsequent anaerobic digestion: an up to date review

Dewaterability of sewage sludge by ultrasonic, thermal and chemical treatments

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

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