Reduction in excess sludge production in a dairy wastewater treatment plant via nozzle-cavitation treatment: Case study of an on-farm wastewater treatment plant

Hirooka, Kayako; Asano, Ryoki; Yokoyama, Akira; Okazaki, Masao; Sakamoto, Akira; Nakai, Yutaka

doi:10.1016/j.biortech.2009.01.011

Cited by 40 publications

(17 citation statements)

References 17 publications

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“…It has been also observed that the VCS achieved better energy efficiency compared to high-speed homogenizer (HSH). Hirooka et al (2009) have reported the application of nozzle-cavitation treatment to reduce excess sludge production in a dairy wastewater treatment plant. The sludge disintegration system comprised a pump, a disintegration tank and a cavitation nozzle.…”

Section: Sludge Decompositionmentioning

confidence: 99%

Hydrodynamic Cavitation for Food and Water Processing

Gogate

2010

Food Bioprocess Technol

153

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Hydrodynamic cavitation, which was and is still looked upon as an unavoidable nuisance in the flow systems, can be a serious contender as an alternative to acoustic cavitation for intensification of different physical and chemical processing applications. Hydrodynamic cavitation results in the generation of hot spots, highly reactive free radicals and turbulence associated with liquid circulation currents, which can result in the intensification of various physical/chemical operations. The present work highlights the different aspects of hydrodynamic cavitation including the basic mechanism, bubble dynamics analysis with recommendations for optimum operating parameters, reactor designs and an overview of applications in different areas of food and water processing. The major applications discussed in the work include food sterilization, microbial cell disruption for the release or extraction of enzymes, water disinfection and wastewater treatment. It appears that hydrodynamic cavitation results in conditions similar to those generated using acoustic cavitation but at comparatively much larger scale of operation and with better energy efficiencies.

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Section: Sludge Decompositionmentioning

confidence: 99%

Hydrodynamic Cavitation for Food and Water Processing

Gogate

2010

Food Bioprocess Technol

153

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“…A number of sludge disintegration processes including thermal [6], ozonation [7], alkaline [8], fenton [9], mechanical [10], biological [11], ultrasound [12], disperser [13], microwave [14], and biological [15] have been investigated for pretreatment of waste sludge. Recently, pretreatment techniques have been incorporated in MBRs to control excess sludge, including ozone, thermal [1], and cavitation [16] pretreatments. Alkaline pretreatment include usage of chemicals such as NaOH, KOH, Mg(OH) 2 , and Ca(OH) 2 .…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

Effect of alkaline and ozone pretreatment on sludge reduction potential of a membrane bioreactor treating high-strength domestic wastewater

Kumar

Arulazhagan

et al. 2014

Desalination and Water Treatment

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A B S T R A C TThe wide application and utilization of the activated sludge process has resulted in the production of excess sludge, posing a serious disposal problem. Many efforts have been dedicated to reduce the excess sludge by treatments such as digestion and dewatering. In this study, an aerobic submerged membrane bioreactor (MBR) was used to study the effect of alkaline and ozone pretreatment on the efficiency of sludge reduction. For this purpose, two MBRs were fabricated. Among the two MBRs, one acted as a control reactor (CMBR) and the other acted as an experimental reactor (EMBR). The MBRs were operated with mixed liquor suspended solids (MLSS) concentrations in the range of 7,000-7,200 mg/L for a period of 120 d. In the EMBR, part of the MLSS was withdrawn at a ratio of 1.5% of Q and was pretreated by alkali-ozone. The sludge pretreatment was carried out at pH 11 and an ozone dosage of 0.09 gO 3 /g MLSS. During the pretreatment, 40% COD solubilization and 30% suspended solid reduction were observed. The pretreated sludge was returned to the reactor for further degradation, where it was found to be 37% degraded. During the 120 d of reactor operation, both of the MBRs maintained a relatively constant transmembrane pressure. The sludge digestion does not have any impact on the COD removal efficiency of the reactor.

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“…[1] Similarly, the esterified phosphate group, an important bond for milk caseins that are conjugated proteins and represent about 80% of milk proteins, is found to be the largest phosphorus contributor, followed by another two phosphorus sources, i.e., the phosphoric acid and the detergent used for rinsing the milking pipelines. [2,3] In the past, discharging milking parlor wastewater to a stream, a road ditch leading to a stream, or field drain tile leading to a stream was largely ignored because of the small volume with a lower level of pollution potential for the environment.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous removal of nutrients from milking parlor wastewater using an AO₂sequencing batch reactor (SBR) system

Zhu

2015

Journal of Environmental Science and Health, Part A

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The feasibility of using a lab-scale, anaerobic-aerobic-anoxic-aerobic sequencing batch reactor ((AO)2 SBR) to simultaneously remove biological organics, nitrogen and phosphorus from dairy milking parlor wastewater was investigated in this study. Three hydraulic retention times (HRT = 2.1, 2.7, and 3.5 days) and three mixing-to-process time ratios (TM/TP = 0.43, 0.57, and 0.68) were evaluated as two controlling factors using a 3 × 3 experimental design to determine the optimal combination. Results showed that the HRT of 2.7 days with TM/TP = 0.57 was the best to achieve simultaneous nutrients removal for the influent with initial soluble chemical oxygen demand (SCOD) of about 2000 mg L(-1) (only 0.55 mg L(-1) NH4-N, < 0.1 mg L(-1) nitrate, and 0.14 mg L(-1) soluble phosphorus in the effluent). Good correlations between pH and ORP, and ORP and DO, were also obtained with correlation coefficients all higher than or equal to 0.975. These relationships could be used to develop real-time control strategies to optimize the duration of each operating phase in the (AO)2 SBR system to save energy and enhance treatment efficiency.

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Reduction in excess sludge production in a dairy wastewater treatment plant via nozzle-cavitation treatment: Case study of an on-farm wastewater treatment plant

Cited by 40 publications

References 17 publications

Hydrodynamic Cavitation for Food and Water Processing

Hydrodynamic Cavitation for Food and Water Processing

Effect of alkaline and ozone pretreatment on sludge reduction potential of a membrane bioreactor treating high-strength domestic wastewater

Simultaneous removal of nutrients from milking parlor wastewater using an AO₂sequencing batch reactor (SBR) system

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Reduction in excess sludge production in a dairy wastewater treatment plant via nozzle-cavitation treatment: Case study of an on-farm wastewater treatment plant

Cited by 40 publications

References 17 publications

Hydrodynamic Cavitation for Food and Water Processing

Hydrodynamic Cavitation for Food and Water Processing

Effect of alkaline and ozone pretreatment on sludge reduction potential of a membrane bioreactor treating high-strength domestic wastewater

Simultaneous removal of nutrients from milking parlor wastewater using an AO2sequencing batch reactor (SBR) system

Contact Info

Product

Resources

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Simultaneous removal of nutrients from milking parlor wastewater using an AO₂sequencing batch reactor (SBR) system