Remediation of Polluted Wastewater Effluents: Hydrocarbon Removal

Akpor, Oghenerobor B.; Okolomike, UF; Olaolu, D.T.; Bi, Aderiye

doi:10.3923/tasr.2014.160.173

Cited by 27 publications

(28 citation statements)

References 21 publications

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“…Free-swimming ciliates, crawling ciliates, colonial stalked ciliates and increased presence of rotifers describe the biological characteristics of activated during this phase of WWTP operation(Figure 4). The observed stalked ciliates indicated good floc formation, sufficient dissolved oxygen and efficient organic compounds removal, while increased presence of rotifers indicated that the AS process had reached the stabilization phase [9,13]. Furthermore, the presence of rotifers in activated sludge contributed to the removal of effluent turbidity by consuming non-flocculated bacteria and to lower BOD and TSS…”

mentioning

confidence: 97%

“…[6][7][8] This also applies for metazoan species, such as the rotifers, which can be found only in very stable activated sludge environments with low F/M ratios. [9] Most ciliates present in biological wastewater treatment plants can be divided into three main groups according to their feeding behavior: free swimmers, which swim in the sludge liquid fraction and remain in suspension in the sedimentation tank; attached ciliates, which are attached to the bacterial aggregates and settle in the sedimentation tank; and crawlers, which live in the floc surface and settle in the sedimentation tank. Populations of organisms associated with the flocs are at great advantage compared to those which swim freely in the liquid fraction and thus can be washed out of the system through the effluent.…”

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confidence: 99%

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Influence of wastewater treatment plants' operational conditions on activated sludge microbiological and morphological characteristics

Amanatidou¹,

Samiotis²,

Trikoilidou³

et al. 2015

Environmental Technology

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The effect of wastewater composition and operating conditions in activated sludge (AS) microbiological and morphological characteristics was studied in three AS wastewater treatment plants (WWTPs): (a) a high organic load slaughterhouse AS WWTP, operating at complete solids retention, monitored from its start-up and for 425 days; (b) a seasonally operational, low nitrogen load fruit canning industry AS WWTP, operating at complete solids retention, monitored from its start-up and until the end of the season (87 days); (c) a municipal AS WWTP, treating wastewater from a semi-combined sewer system, monitored during the transitions from dry to rainy and again to dry periods of operation. The sludge microbiological and morphological characteristics were correlated to nutrients' availability, solids retention time, hydraulic retention time, dissolved oxygen, mixed liquor suspended solids (MLVSS), organic load (F/M) and substrate utilization rate. The AS WWTPs' operation was distinguished in periods based on biomass growth phase, characterized by different biological and morphological characteristics and on operational conditions. An anoxic/aerobic selector minimizes the readily biodegradable compounds in influent, inhibiting filamentous growth. Plant performance controlling is presented in a logic flowchart in which operational parameters are linked to microbial manipulation, resulting in a useful tool for researchers and engineers.

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confidence: 97%

mentioning

confidence: 99%

Influence of wastewater treatment plants' operational conditions on activated sludge microbiological and morphological characteristics

Amanatidou¹,

Samiotis²,

Trikoilidou³

et al. 2015

Environmental Technology

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“…This in turn prompted the construction and operation of wastewater treatment plants (WWTPs) and the eventual development of advanced wastewater treatment technologies (Glicksman and Batzel 2010;Sciampacone 2013). Although there are biological and chemical WWTPs, the former are usually the preferred choice as they are more environmentally friendly (Akpor and Muchie 2010). Activated sludge, membrane bioreactors (MBRs), trickling filters, up-flow anaerobic sludge blanket reactors, lagoons and artificial wetlands are the most commonly used biological treatment processes for both industrial and domestic wastewaters (Akpor and Muchie 2010;Heffernan et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Although there are biological and chemical WWTPs, the former are usually the preferred choice as they are more environmentally friendly (Akpor and Muchie 2010). Activated sludge, membrane bioreactors (MBRs), trickling filters, up-flow anaerobic sludge blanket reactors, lagoons and artificial wetlands are the most commonly used biological treatment processes for both industrial and domestic wastewaters (Akpor and Muchie 2010;Heffernan et al 2011). However, the design and operation of treatment systems are constantly being improved for better efficiency and robustness.…”

Section: Introductionmentioning

confidence: 99%

Ecophysiology of nitrifying communities in membrane bioreactors

Awolusi

Kumari

Bux

2014

Int. J. Environ. Sci. Technol.

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Membrane bioreactors (MBRs) are rapidly becoming the technology of choice over conventional activated sludge treatment systems due to their smaller footprint, reduced sludge production, rapid start-up of biological processes, complete removal of suspended solids and better effluent quality. The retention of sufficient amount of slow-growing nitrifiers makes it feasible for the MBRs to achieve strong tolerance against the shock loads with stable and highly efficient nitrogen removal. Various studies have focused on the ecophysiology of nitrifiers in MBRs as well as their distinctive operational parameters as well as their impact on the selection and activity of nitrifying community. Several techniques have been employed over the years to understand the nitrifying community and their interaction within the MBR system, which led to its modification from the initial design. This review focuses on the identification of optimal operational and environmental conditions for efficient nitrification in MBRs. The advantages and limitations of different techniques employed for investigating the nitrifying communities in MBRs are also emphasized.

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“…in surface water bodies and ex situ by means of engineered tanks having system of contaminated water and the plants. Both the systems require an understanding of the contaminant speciation and interactions of all contaminants and nutrients (Terry and Banuelos 2000 ;Akpor et al 2014 ). The hydroponically cultivated roots of terrestrial plants are found to be more effective than the normal plant-based systems.…”

Section: Rhizofi Ltrationmentioning

confidence: 99%