Advertise here Publish your press releases here Sponsor BioPortfolio
Follow us on Twitter Sign up for daily news and research emails Contributors wanted

Image analysis application for the study of activated sludge floc size during the treatment of synthetic and real fishery wastewaters.

12:05 EDT 20th April 2014 | BioPortfolio

Summary of "Image analysis application for the study of activated sludge floc size during the treatment of synthetic and real fishery wastewaters."

Fishery wastewater treatment can be compromised due to seasonal production. The use of sequencing batch reactors is not completely successful, despite flexibility being one of the principal advantages. Most research on activated sludge is performed using synthetic wastewater to ensure a stable and constant feed. The current work compared biomass morphology and settling ability using image analysis of synthetic and real fishery wastewaters, with and without NaCl addition.
The final effluent presented higher turbidity for both wastewaters after NaCl addition, and lower SVI values. For synthetic wastewater, NaCl addition led to the total aggregates' area (TA) increase from 1.46 to 2.09 mm(2)/μL, alongside the growth of intermediate aggregates into larger aggregates. The addition of NaCl to the fishery wastewater led to a decrease of the TA from 4.43 to 1.72 mm(2)/μL. The biomass composition decreased in larger and intermediate structures, opposite to the smaller aggregates' area percentage increase.
NaCl addition to synthetic wastewater incited flocculation increasing sludge settling ability. A slight aggregate disruption was responsible for a turbidity increase. A strong deflocculation was identified in fishery wastewater with NaCl from the decrease of intermediate and large aggregates. This contrasted with pinpoint flocs release, which increased the turbidity levels. CONCLUSIONS, RECOMMENDATIONS, AND
It could be established that synthetic wastewater biomass flocculation and fishery wastewater biomass deflocculation, observed during 0.5% NaCl experiments, were related to sludge settling and effluent turbidity changes. Furthermore, the biomass changes obtained with synthetic wastewater cannot be extrapolated to fishery wastewater.


IBB-Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057, Braga, Portugal.

Journal Details

This article was published in the following journal.

Name: Environmental science and pollution research international
ISSN: 1614-7499


PubMed Articles [32895 Associated PubMed Articles listed on BioPortfolio]

Influencing factors of floc size distribution and fractal dimension of activated sludge.

Floc size distribution (FSD) and fractal dimension are the important parameters for activated sludge. FSD of aerobic activated sludge during flocculation process was measured by a laser particle size...

Comparison of imidazolium ionic liquids and traditional organic solvents: effect on activated sludge processes.

Data concerning the biodegradability and ecotoxicity of ionic liquids (ILs) obtained so far are insufficient in the context of IL removal from wastewater in activated sludge systems. Thus, in this wor...

The role of temperature and CaCl2 in activated sludge dewatering under hydrothermal treatment.

Dewatering is important for activated sludge disposal. The dewaterability of activated sludge was first deteriorated and then ameliorated when the temperature was raised from 100 to 200 °C with a th...

Influences of d-tyrosine on the stability of activated sludge flocs.

The sludge floc stability is essential for the solid/liquid separation in biological wastewater treatment. In this study, the effect of an exogenous d-tyrosine on the shear stability and surface chara...

New insight into the biological treatment by activated sludge: The role of adsorption process.

The objective of this study was to evaluate the effect of adsorption on the biological treatment process of wastewater. In the absence of substrate in the water, activated sludge developed well in the...

Clinical Trials [2959 Associated Clinical Trials listed on BioPortfolio]

Clinical Application of Image Guided Liver Surgery

Image-guided surgery is a new technology, which is used to create 3-D pictures that generate a map of the liver. This map will allow surgeons to know the exact anatomical location of their...

Diagnosis of Intestinal Motility by Image Analysis Using Capsule Endoscopy

Conventional intestinal manometry is the current gold standard for the evaluation of intestinal motility, and identifies patterns of intestinal dysmotility. However intestinal manometry in...

Digital Image Analysis and Fluorescent In Situ Hybridization in Predicting Development of Esophageal Cancer in Patients With Barrett Esophagus

RATIONALE: Diagnostic procedures, such as digital image analysis and fluorescent in situ hybridization, may help doctors learn the extent of Barrett esophagus. PURPOSE: This randomized ph...

Investigation of the Efficacy and Safety of Drotrecogin Alfa (Activated) in Pediatric Severe Sepsis

The purposes of this study are to determine: 1. Whether drotrecogin alfa (activated) helps children with severe sepsis survive their condition more often or recover faster than chi...

Adjuvant Treatment of Pulmonary Embolism With Drotrecogin Alfa (Activated): Phase II Exploratory Study

An exploratory, multicenter, randomized, placebo-controlled, double blind, dose escalation study comparing a standard therapy for submassive pulmonary embolism (Enoxaparin sodium) to a com...

Medical and Biotech [MESH] Definitions

A technique encompassing morphometry, densitometry, neural networks, and expert systems that has numerous clinical and research applications and is particularly useful in anatomic pathology for the study of malignant lesions. The most common current application of image cytometry is for DNA analysis, followed by quantitation of immunohistochemical staining.

A family of gram-negative, asporogenous rods or ovoid cells, aerobic or facultative anaerobic chemoorganotrophs. They are commonly isolated from SOIL, activated sludge, or marine environments.

A type of analysis in which subjects in a study group and a comparison group are made comparable with respect to extraneous factors by individually pairing study subjects with the comparison group subjects (e.g., age-matched controls).

A condition in which the ocular image of an object as seen by one eye differs in size and shape from that seen by the other.

A method of delineating blood vessels by subtracting a tissue background image from an image of tissue plus intravascular contrast material that attenuates the X-ray photons. The background image is determined from a digitized image taken a few moments before injection of the contrast material. The resulting angiogram is a high-contrast image of the vessel. This subtraction technique allows extraction of a high-intensity signal from the superimposed background information. The image is thus the result of the differential absorption of X-rays by different tissues.

Search BioPortfolio: