Assessment of activated sludge stability in lab-scale experiments

Broeck, Rob M.R. Van den; Impe, Jan Van; Smets, Ilse

doi:10.1016/j.jbiotec.2009.02.019

Cited by 21 publications

(23 citation statements)

References 20 publications

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“…(). The FVI values in the two bioflocs treatments were ~100 mL g −1 TSS and hence the bioflocs had the capacity to remain stable and suspended in the water column without excessive settling (Van den Broeck, Van Impe & Smets ). In short, it could be concluded that the water quality in which the bioflocs maintained was acceptable for shrimp culture.…”

Section: Discussionmentioning

confidence: 99%

Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities ofLitopenaeus vannamei(Boone) in zero-water exchange culture tanks

et al. 2012

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A 30‐day experiment was performed to investigate the effects of bioflocs on water quality, and survival, growth and digestive enzyme activities of the white shrimp Litopenaeus vannamei. Altogether 28 shrimp (7.4 ± 0.1 g) were stocked in each 150 L tank. Two bioflocs treatments and one control were managed: ‘bioflocs 1’ and ‘bioflocs 2’ based on two different densities of the bioflocs, and clean water control without the bioflocs. Brown sugar was added to the bioflocs 1 and bioflocs 2 treatment tanks accounting for 28% and 80% of the shrimp feed respectively (corresponding to proximate C/N ratios of 10 and 14 in daily additions of organic matter respectively), so as to promote bioflocs production and approximately 14 mL L−1 in treatment bioflocs 1 and 20 mL L−1 in treatment bioflocs 2 were maintained from day 15. Monitoring of selected water quality parameters throughout the whole experiment period showed that all parameters remained within recommended levels for shrimp culture in the bioflocs treatments at zero‐water exchange, especially low total ammonia nitrogen and nitrite nitrogen levels. By the end of the experiment, shrimp survival rates were above 86%, with no significant differences (P > 0.05) among the three groups. Both weight gain rate and special growth rate tended to increase in the bioflocs treatments compared to those in the control. Meanwhile, the overall specific activities of protease, amylase, cellulase and lipase of the shrimp in the bioflocs treatments were all higher than those in the control; and for the specific activity of the same digestive enzyme, the differences between the bioflocs treatments and the control performed inconsistently among different organs: hepatopancreas, stomach and intestine. Present results suggest that the bioflocs can not only maintain favourable water quality conditions for shrimp culture and help shrimp grow well in zero‐water exchange culture systems, but may also have a positive effect on digestive enzyme activities of the shrimp.

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Section: Discussionmentioning

confidence: 99%

Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities ofLitopenaeus vannamei(Boone) in zero-water exchange culture tanks

et al. 2012

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“…Undoubtedly, in order to solve the number of problems occurring during activated sludge studies, it is reasonable to conduct investigations in a laboratory scale. The transfer from the industrial to laboratory scale requires a period of adaptation of the activated sludge community to the conditions of the SBR [19,20]. The adaptation period should be neither too short, or else sludge will not be stabilized, nor too long, or else experiment will be time consuming.…”

Section: Resultsmentioning

confidence: 99%

“…Setting of adaptation regimes and periods makes it possible to conduct the research without considering the reaction of activated sludge to stress caused by repeated volume reductions and stabilization of the main factors. To avoid mistakes in the experimental results, it is important to assess quantitatively in advance whether conditions in the activated sludge have stabilized [19,20]. The common practice assumes that the optimal period for adaptation lasts 2-2.5 sludge ages [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Bioindication assessment of activated sludge Adaptation in a Lab-Scale Experiment

Babko

Kuzmina

Jaromin-Gleń

et al. 2015

Ecological Chemistry and Engineering S

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The adaptation of activated sludge from the Hajdow sewage treatment plant in a laboratory SBR was studied. The structure of the ciliate assembly was considered as a criterion. 32 ciliate species were found during the experiment. The composition and changes in the ciliate community structure during the process of activated sludge adaptation was examined. In the process of adaptation, reduction was observed in the number of ciliate species together with an increase in assembly total abundance. The decrease in the Shannon diversity index and equitability index in the adaptation process was observed. In the process of adaptation, two states of ciliate assembly were marked out - unstable transient period and stable period. During the transient period, reduction of ammonium utilization efficiency down to 50% and its subsequent increase up to 80% in the stable period were observed. In the transient period, the Simpson dominance index remained low but increased in the stable period. At a temperature of 10°C, the transient period lasted from six to nine days. After the stabilization process, the diversity of the ciliate assemblage remained at a lower level. Rarefaction methods showed that the number of potential ecological niches of ciliate amounted to 30 in the adaptation period, whereas there were only 15-20 ecological niches in adapted sludge.

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“…Để xử lý các chất hữu cơ dễ sinh hủy trong môi trường nước thì phương pháp được ưu tiên lựa chọn đó là phương pháp sinh học và dạng kỹ thuật thường được sử dụng khi hàm lượng chất hữu cơ không quá cao là bùn hoạt tính hoặc lọc sinh học hiếu khí [1][2][3][4][5]. Tuy nhiên, cả hai dạng kỹ thuật này đòi hỏi phải cấp khí trong suốt quá trình xử lý, do vậy chi phí xử lý tăng lên.…”

Section: đặT Vấn đề unclassified

Treatment of Organics and Ammonium in Milk Manufacturing Wastewater using Combined Biofilter and Plant Process

Nguyen¹

2017

NST

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The objective of this study was to treat biological ammonium and organic matter from milk manufacturing wastewater in Binh Dinh using combined biofilter and plant process. The treatment efficiency of biofilter-plant method in section biosysterm was higher than that of individually biofilter and plant method to be observed. The obtained experiment results showed that the outflowing physico-chemical parameters as COD, NH4+ of milk production wastewater after treatment by the combined use of biofilter and plant treatment reached QCVN 40: 2011/BTNMT for industrial wastewater sort A.

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Assessment of activated sludge stability in lab-scale experiments

Cited by 21 publications

References 20 publications

Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities ofLitopenaeus vannamei(Boone) in zero-water exchange culture tanks

Effects of bioflocs on water quality, and survival, growth and digestive enzyme activities ofLitopenaeus vannamei(Boone) in zero-water exchange culture tanks

Bioindication assessment of activated sludge Adaptation in a Lab-Scale Experiment

Treatment of Organics and Ammonium in Milk Manufacturing Wastewater using Combined Biofilter and Plant Process

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