Changes of physicochemical properties of sewage sludge during ozonation treatment: Correlation to sludge dewaterability

Zhang, Jian; Jun, Zhang; Tian, Yu; Li, Ning; Kong, Lingchao; Sun, Li; Yu, Miao; Zuo, Wei

doi:10.1016/j.cej.2016.04.151

Cited by 116 publications

(34 citation statements)

References 50 publications

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“…could decompose organic matter into inorganic materials (Murat et al 2010). Significant research efforts have been devoted to the application of ozone in sludge treatment (Chu et al 2009;Zhang et al 2016;Chacana et al 2017), which promote cell cracking and reduce the number of excess sludge, thus reducing the waste disposal of activated sludge (even to zero) and decreasing the chemical oxygen demand (COD), chromaticity, and turbidity in conventional activated sludge process with ozone treating partial backflow sludge. Ozone has also been shown to be a superior disinfectant compared to conventional disinfectants such as chlorine and its derivatives (Chong et al 2011;Mecha et al 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The ozone could directly disrupt viral and bacterial metabolism and reproduction by breaking down macromolecule polymers. Most studies have focused on ozone treatments on sewage sludge derived from the municipal wastewater treatment plants where wastewater was collected from industrial and domestic sources (Chu et al 2009;Zhang et al 2016;Chacana et al 2017;Chekli et al 2017). Very little research has been focused on the agricultural utilization of solely domestic sludge, which avoids the environmental pollution introduced by industrial sludge.…”

Section: Introductionmentioning

confidence: 99%

“…Such sludge could not be used in raw or dried form for agricultural application and composting, leading to the secondary environmental pollution caused by improper disposal of sludge (Bratina et al 2016). Ozone is a functional disinfectant, oxidizer, and reducer when used to treat sludge (Tian et al 2015;Zhang et al 2016). Furthermore, the sludge mineralization process during ozone treatments…”

mentioning

confidence: 99%

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Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition

Yang

Guo²,

Qiu

2018

Journal of Integrative Agriculture

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Here, the ozone-treated domestic sludge was diluted up to four different multiples and utilized as a nutritional source for hydroponic lettuce growth. Additionally, lettuce was cultured using the modified Hoagland nutrient solution as a control. The effects of ozone-treated domestic sludge on lettuce growth and nutrition were studied. Results showed that the lettuce treated with modified Hoagland inorganic nutrient solution had increased leaf number, plant height, fresh weight and dry weight compared to those treated with the ozone-treated domestic sludge dilution (P<0.05). However, the lettuce cultivated with the 2-fold ozone-treated sludge dilution showed significantly higher (P<0.05) contents of chlorophyll, soluble sugar and ascorbic acid (Vc) compared to that treated with modified Hoagland nutrient solution. And the nitrate concentration in the lettuce cultured with the 2-fold ozone-treated sludge dilution was 53.93% less than that cultured with the modified Hoagland nutrient solution, which was a significant improvement (P<0.05). This study suggested that the 2-fold ozone-treated sludge dilution is optimal for lettuce hydroponic nutrient requirements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition

Yang

Guo²,

Qiu

2018

Journal of Integrative Agriculture

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“…Recently, sludge minimization/pre‐treatment has been implemented to wastewater treatment plants to improve the anaerobic digestion process. Pre‐treatment processes are based on thermal (conventional heating; microwave irradiation), mechanical (high pressure homogenizer; ultrasonication; electric pulse power method; gamma irradiation; stirred ball mills; lysate‐thickening centrifugal technique; jetting and colliding method), chemical (acidic and alkaline treatment; ozonation; peroxidation), and biological techniques, or a combination of them . The application of these techniques keeps increasing for their positive effect on sludge processing, transportation, and landfilling, because all of these methods enhance sludge disintegration and solubilization of complex particulate matter.…”

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Sludge Pre‐Treatment Techniques to Enhance Sludge Dewaterability and Biogas Production

Taş

Yangin‐Gomec

Ölmez-Hancı

et al. 2017

CLEAN Soil Air Water

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Effectiveness of ultrasonication, microwave technologies, and enzyme addition prior to anaerobic digestion is investigated using sludge samples taken from the secondary settling tank of a domestic wastewater treatment plant to improve methane production, enhance dewaterability characteristics of the sludge, and to reduce excess sludge. Microwave pre‐treatment (1500 W, 10 min at 175 °C) results in better extra digester performance (compared to the control reactor) in terms of methane production (25 m3 ton−1 suspended solids (SS)) than ultrasound (no improvement) and enzyme pre‐treatment (11 m3 ton−1 SS). While methane production is not improved as a result of ultrasonication pre‐treatment (15 000 kJ kg−1 SS), a noticeable increase (19%) is observed in the case of microwave pre‐treatment. Higher compactibility values are obtained after ultrasonication and microwave application compared to the control (i.e., from 7.1 to 8.7 and 9.2%, respectively) before anaerobic digestion. Although ultrasonication and microwave application decrease the dewaterability of the raw sludge (capillary suction time (CST) from 827 to 1364 and 2290 s, respectively), similar dewaterability results are obtained at the end of the anaerobic digestion process for all pre‐treated sludge samples. An economic assessment of this study shows that pre‐treatment with microwave results in more than 10‐fold less net cost compared to the enzyme application.

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“…The ozonation was run for maximum of 170 minutes. 100 mL of activated sludge sample was withdrawn from the sampling port for analysis at different interval time, and another 100 mL of raw sample was return into the reactor to maintain its concentration and working volume [26]. Residual ozone coming out from the reactor was trapped with 2% potassium iodide.…”

Section: Ozonation Experimentsmentioning

confidence: 99%

Ozonation of return activated sludge for disintegration and solubilisation with synthesized titanium oxide as catalyst

et al. 2018

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Abstract.Ozonation of activated sludge in the present of titanium dioxide (TiO2) as catalyst to enhance the production of hydroxyl radical was evaluated in comparison to the sole ozonation process. In this process, the catalytic ozontion showed improvement in increasing ozone consumption and improving activated sludge disintegration and solubilisation. The reduction of total suspended solid (TSS), volatile suspended solid (VSS) and soluble chemical oxygen demand (SCOD) solubilisation was better in the catalytic ozonation system. Initial pH 7 of activated sludge was found best to disintegrate and solubilise the sludge flocs. However upon additional of sodium hydroxide (NaOH) in pH adjustment enhanced the solubilisation of organic matter from the flocs and cells, making the initial pH 9 is the best condition for activated sludge solubilisation. Yet the initial pH 7 of activated sludge supernatant was the best condition to achieve SCOD solubilisation due to sludge floc disintegration, when it had stronger correlation between TSS reduction and SCOD solubilisation (R 2 =0.961). Lower amount of catalyst of 100 mgTiO2/gTSS was found to disintegrate and solubilise the activated sludge better with 30.4% TSS reduction and 25.2% SCOD solubilisation efficiency, compared to 200 mgTiO2/gTSS with 21.9% and 17.1% TSS reduction and SCOD solubilisation, respectively.

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Changes of physicochemical properties of sewage sludge during ozonation treatment: Correlation to sludge dewaterability

Cited by 116 publications

References 50 publications

Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition

Effects of ozone-treated domestic sludge on hydroponic lettuce growth and nutrition

Comparative Assessment of Sludge Pre‐Treatment Techniques to Enhance Sludge Dewaterability and Biogas Production

Ozonation of return activated sludge for disintegration and solubilisation with synthesized titanium oxide as catalyst

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