The activated-sludge fauna and performance of five sewage treatment plants in Beijing, China

Shenggui, Chen; Xu, Muqi; Cao, Hong; Zhu, Jiang; Zhou, Kexin; Xu, Jun; Yang, Xiao; Gan, Yiping; Weiyan, Liu; Zhai, Jiaji; Shao, Yang

doi:10.1016/j.ejop.2004.01.003

Cited by 49 publications

(29 citation statements)

References 17 publications

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“…Since wastewater treatment is a process of increasing importance in a world with an ever-growing human population, the presence and action of microbial communities has received particular attention in recent years. Consequently, revised lists of protozoa have been made (Madoni & Ghetti 1981;Augustin & Foissner 1992;Madoni et al 1993;Foissner & Berger 1996;Martin-Cereceda et al 1996;Amann et al 1998;Ettl 2001;Madoni 2002;Chen et al 2004). Of the 228 protozoa species listed for the activated-sludge plants, about 160 belong to the phylum Ciliophora, but only a limited number of these have been observed frequently (Table I).…”

Section: Activated-sludge Processmentioning

confidence: 99%

Protozoa in wastewater treatment processes: A minireview

Madoni

2011

Italian Journal of Zoology

178

114

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Biological wastewater treatment is a process of increasing importance in a world with an ever-increasing human population. Wastewater treatment facilities are designed to maintain the high density and activity levels of those microorganisms that carry out the various purification processes. Protozoa are one of the most common components in these man-made ecosystems and play an important role in wastewater purification processes. Protozoa are responsible for improving the quality of the effluent, maintaining the density of dispersed bacterial populations by predation. Studies of the relationships between protozoa and physicochemical and operational parameters have revealed that the species structure of these communities is an indicator of plant efficiency. The Sludge Biotic Index (SBI), an index based on the structure and abundance of the microfauna inhabiting the activated sludge and mixed liquor, has been devised to monitor activated-sludge plant performance. Heavy metals and other pollutants are toxic to most microorganisms at certain concentrations. These toxicants are common pollutants of sewage, particularly where there is industrial waste input. The protozoa community is a complex assemblage of interacting organisms, often including species that are sensitive, resistant or intermediate in their tolerance to pollutants. Many studies conducted on contaminated activated sludge and mixed liquor have revealed changes in the dynamics of the protozoa community. Tests on the acute toxicity of pollutants on ciliates have revealed that these microorganisms are useful bioindicators for evaluating the toxicity of waters polluted by different concentrations of metals.

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Section: Activated-sludge Processmentioning

confidence: 99%

Protozoa in wastewater treatment processes: A minireview

Madoni

2011

Italian Journal of Zoology

178

114

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“…While seasonal changes of different components of the microfauna in BWTSs have been monitored by some researchers (Chen et al 2004;Martín-Cereceda et al 2001), microfauna community dynamics have seldom been related with sludge bulking. In this study, besides the annual cyclic changes, we observed significant differences in the community structures at different SVI levels, as shown in Figs (Fig.…”

Section: Discussion Sludge Bulking As the Driving Force For Changes Imentioning

confidence: 99%

Dynamics of the microfauna community in a full-scale municipal wastewater treatment plant experiencing sludge bulking

et al. 2013

European Journal of Protistology

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We investigated the dynamics of the microfauna community in activated sludge, with special reference to sludge bulking, in two parallel municipal wastewater treatment systems in Beijing, China over a period of 14 months. Annual cyclic changes in microfauna community structures occurred in both systems. RELATE analysis based on Spearman's Rank correlation indicated that microfauna community structures were highly correlated with the sludge volume index (SVI) (p < 0.001), which indicates sludge settleability. Nutrient conditions of raw sewage (p < 0.01) and hydraulic retention time (HRT) (p < 0.05) were also related to microfauna community structures. Abundances of the species Epistylis plicatilis and Vorticella striata increased significantly with an increase in SVI (p < 0.001) and decrease in water temperature (p < 0.001), suggesting that sludge bulking may have created favorable conditions for the two species, even under unfavorable temperature conditions. Sludge de-flocculation primarily due to the excessive growth of Microthrix parvicella-like filaments could be an important driving force for the microfauna community changes. The release of flocculated non-filamentous bacteria may represent a suitable food source for these species. The two species may be considered as potential bioindicators for sludge bulking.

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“…Table 3 Frequency of occurrence and abundance of protozoa and small metazoa during the study; n -number of samples; ± -standard deviation; P -probability of H0 (series 1 -wastewater treatment, series 2 -wastewater with flowback water treatment) Observed microfauna consisted of taxa belonging to positive keygroups [11]. The predominance of shelled amoeba, crawling ciliates and attached ciliates with wide peristomes and the fact that tardigrades and rotifers were commonly found both indicated a healthy, low-loaded, sufficiently aerated and well-flocculated activated sludge that would produce high quality effluent [21][22][23][24][25][26]. The sludge biotic index (SBI), calculated on the basis of the microfauna composition in samples, was always the highest value possible (10/10).…”

Section: Microfauna Communitymentioning

confidence: 99%

Impact of Flowback Water on Activated Sludge Biocenosis During Municipal Wastewater Treatment

Ziembińska-Buczyńska

Drzewicki

Kulikowska

2015

Ecological Chemistry and Engineering S

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Abstract:The aim of this study was to determine the effect of flowback water on an activated sludge biocenosis during municipal wastewater treatment in the sequencing batch reactors (SBRs). Two series were performed. In series 1, only municipal wastewater was treated, whereas in series 2, municipal wastewater with pre-treated flowback water was used. Flowback water constituted 3-5% of the influent and was introduced to the SBRs twice per week. Introducing flowback water did not decrease the quality of effluent from the SBRs. However, the composition of the activated sludge biocenosis differed between series, ie the biodiversity of protozoa and the relative abundance of microfauna in functional groups changed after flowback water addition. Polymerase chain reaction -denaturing gradient gel electrophoresis (PCR-DGGE) showed that the ammonia oxidizers community responded faster to flowback water addition than the total bacterial community and remained relatively stable during treatment. However, after 9 weeks of exposure to flowback water, ammonia oxidizing bacteria (AOB) biodiversity decreased. This suggests that prolonged exposure could cause nitrification problems, leading to deterioration in effluent quality.

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The activated-sludge fauna and performance of five sewage treatment plants in Beijing, China

Cited by 49 publications

References 17 publications

Protozoa in wastewater treatment processes: A minireview

Protozoa in wastewater treatment processes: A minireview

Dynamics of the microfauna community in a full-scale municipal wastewater treatment plant experiencing sludge bulking

Impact of Flowback Water on Activated Sludge Biocenosis During Municipal Wastewater Treatment

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