Performance of aerobic granular sludge in different bioreactors

Zhao, Xia; Chen, Zhonglin; Shen, Jiayi; Wang, Xiaochun

doi:10.1080/09593330.2013.856955

Cited by 21 publications

(8 citation statements)

References 4 publications

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“…The development of sludge granulation is one of the important factors contributed towards the successful operation in UASB [41]. This finding is consistent with the founding by Zhao et al, [42] and Wu et al, [43], whom reported that the pollutants removal efficiency (i.e: COD) was improved by utilizing the granular sludge in wastewater treatment and the size of sludge granule could be proportional with the production of biogas.…”

Section: Biodegradability Of Rice Straw Leachatesupporting

confidence: 82%

Assessment of potential biogas production from rice straw leachate in upflow anaerobic sludge blanket reactor

Rosli¹,

Idrus²,

N.³

et al. 2016

ijsgce

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This study evaluates the potential of Rice Straw Leachate (RSL) to generate biogas and investigate its biodegradability by determining the differences between the theoretical yield and the actual one at its increasing organic loading rate. Seven litre working volume of Up-Flow Anaerobic Sludge Blanket (UASB) reactor is employed under mesophilic condition at temperature of 38 for approximately 17 consecutive weeks. The process performance was evaluated based on the efficiency of COD removal and Specific Methane Production (SMP) in relation to the other parameters such as pH, Organic Loading Rate (OLR), Total Ammonia Nitrogen (TAN) and alkalinity ratio. The OLR were varied at 0.43, 0.55, 0.9 and 1.55g COD/L/d with average COD removal of 79%, 81.2%, 76.1%, and 75.8% respectively. The stability of anaerobic digestion of RSL in UASB was found maintained at an increasing OLR with indicator of pH, TAN and IA/PA ratio that always maintain in the range of 6.5-6.8, below 200mg/L and 0.3 respectively. Meanwhile, the optimum average SMP and COD removal efficiency were 0.18L CH 4 g -1 COD rem and 81.2% respectively, at applied OLR of 0.55g COD/L/d. This study also revealed a relatively high deviation of SMP from its theoretical value, indicating its low degradability and the limitation of nutrient factors present in RSL.

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Section: Biodegradability Of Rice Straw Leachatesupporting

confidence: 82%

Assessment of potential biogas production from rice straw leachate in upflow anaerobic sludge blanket reactor

Rosli¹,

Idrus²,

N.³

et al. 2016

ijsgce

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“…A study conducted to determine the removal of nitrogen in AGMBR reported about 60% total nitrogen removal in the AGMBR [ 111 ]. Another study to determine the performance of AGMBR reported the removal of COD, total phosphorus, nitrate-nitrogen and total nitrogen as 93.17%, 90.42%, 95% and 95%, respectively [ 157 ].…”

Section: Current Research Trends For Membrane Fouling Abatement Inmentioning

confidence: 99%

Membrane Bioreactor (MBR) Technology for Wastewater Treatment and Reclamation: Membrane Fouling

2016

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The membrane bioreactor (MBR) has emerged as an efficient compact technology for municipal and industrial wastewater treatment. The major drawback impeding wider application of MBRs is membrane fouling, which significantly reduces membrane performance and lifespan, resulting in a significant increase in maintenance and operating costs. Finding sustainable membrane fouling mitigation strategies in MBRs has been one of the main concerns over the last two decades. This paper provides an overview of membrane fouling and studies conducted to identify mitigating strategies for fouling in MBRs. Classes of foulants, including biofoulants, organic foulants and inorganic foulants, as well as factors influencing membrane fouling are outlined. Recent research attempts on fouling control, including addition of coagulants and adsorbents, combination of aerobic granulation with MBRs, introduction of granular materials with air scouring in the MBR tank, and quorum quenching are presented. The addition of coagulants and adsorbents shows a significant membrane fouling reduction, but further research is needed to establish optimum dosages of the various coagulants/adsorbents. Similarly, the integration of aerobic granulation with MBRs, which targets biofoulants and organic foulants, shows outstanding filtration performance and a significant reduction in fouling rate, as well as excellent nutrients removal. However, further research is needed on the enhancement of long-term granule integrity. Quorum quenching also offers a strong potential for fouling control, but pilot-scale testing is required to explore the feasibility of full-scale application.

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“…In recent years, there are more and more researchers focusing on the study about aerobic granular sludge (AGS), for example, it was found that the ratio of flocculent sludge should be kept a low level so as to maintain the stable operation of the granular sludge reactor because of the kinetic superiority of flocculent sludge over granular sludge, rather than microbial competition [21]. The distribution of A c c e p t e d M a n u s c r i p t extracellular polymeric substances (EPS), hydraulic shear parameters and reactor configuration have a important influence on the structural stability of AGS [22][23][24]. Moreover, the concentration of Cu2+ and carbon source also plays a key role in performance of AGS [25][26].…”

Section: Introductionmentioning

confidence: 99%

Decreasing effect and mechanism of moisture content of sludge biomass by granulation process

Zhao

Shen

et al. 2015

Environmental Technology

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Disposal of a high volume of sludge significantly raises water treatment costs. A method for cultivating aerobic granules in a sequencing batch airlift bioreactor to significantly produce lower moisture content is described. Results indicate that optimization of settling time and control of the shear stresses acted on the granules. The diameter of the granule was within the range of 1.0-4.0 mm, and its sludge volume index was stabilized at 40-50 mL g(-1). Its specific gravity was increased by a factor of 0.0392, and specific oxygen uptake rate reached 60.126 mg h(-1) g(-1). Moreover, the percentage of its moisture content in the reactor ranged from 96.73% to 97.67%, and sludge volume was reduced to approximately 60%, greatly due to the presence of extracellular polymeric substances in the granules, as well as changes in their hydrophobic protein content. The removal rate of chemical oxygen demand and [Formula: see text] reaches up to 92.6% and 98%, respectively. The removal rates of total phosphorus is over 85%. Therefore, aerobic granular sludge process illustrates a good biological activity.

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Performance of aerobic granular sludge in different bioreactors

Cited by 21 publications

References 4 publications

Assessment of potential biogas production from rice straw leachate in upflow anaerobic sludge blanket reactor

Assessment of potential biogas production from rice straw leachate in upflow anaerobic sludge blanket reactor

Membrane Bioreactor (MBR) Technology for Wastewater Treatment and Reclamation: Membrane Fouling

Decreasing effect and mechanism of moisture content of sludge biomass by granulation process

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