scholarly journals Heavy metals absorption by excessive activated sludge of biological treatment facilities

2020 ◽  
Vol 613 ◽  
pp. 012167
Author(s):  
I V Zykova ◽  
V A Isakov
Keyword(s):  
Heavy Metals ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Treatment Facilities

scholarly journals Microalgae as biological treatment for municipal wastewater – effects on the sludge handling in a treatment plant

2018 ◽  
Vol 78 (3) ◽  
pp. 644-654 ◽  
Author(s):  
J. Olsson ◽  
S. Schwede ◽  
E. Nehrenheim ◽  
E. Thorin
Keyword(s):  
Heavy Metals ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Waste Activated Sludge ◽  
Activated Sludge Process ◽  
Primary Sludge ◽  
Thermophilic Conditions ◽  
Mesophilic Conditions

Abstract A mix of microalgae and bacteria was cultivated on pre-sedimented municipal wastewater in a continuous operated microalgae-activated sludge process. The excess material from the process was co-digested with primary sludge in mesophilic and thermophilic conditions in semi-continuous mode (5 L digesters). Two reference digesters (5 L digesters) fed with waste-activated sludge (WAS) and primary sludge were operated in parallel. The methane yield was slightly reduced (≈10%) when the microalgal-bacterial substrate was used in place of the WAS in thermophilic conditions, but remained approximately similar in mesophilic conditions. The uptake of heavy metals was higher with the microalgal-bacterial substrate in comparison to the WAS, which resulted in higher levels of heavy metals in the digestates. The addition of microalgal-bacterial substrate enhanced the dewaterability in thermophilic conditions. Finally, excess heat can be recovered in both mesophilic and thermophilic conditions.

scholarly journals A STUDY OF HEAVY METAL COMPOSITIONS AND PHOSPHATES IN POLYMER SUBSTANCES OF THE ACTIVATED SLUDGE BIOMASS

2020 ◽  
Vol 25 (3) ◽  
pp. 8-13
Author(s):  
A. M. Dregulo ◽  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Compositional Analysis ◽  
Organic Fraction ◽  
Dominant Form ◽  
Quantitative Content ◽  
Organic Fractions

Introduction. Heavy metals discharged with wastewater can lead to a toxic effect on the microbiocenosis of activated sludge and significantly decrease the degree of wastewater treatment, which dictates the need for a more detailed study and search for ways to detoxify activated sludge at the recycling stage and, at the same time, solve the problems of the neutralization of sewage sludge for safe soil disposal. To ensure the adequacy of the approach to the choice of the methodology for the neutralization of sludge, including sewage sludge, it is necessary to perform compositional analysis of their organic fractions and heavy metal compositions. Methods. To determine the quantitative content of organic components in activated sludge, a sample of sludge was dried to an air-dry state and then subjected to separation into fractions using a method based on the different solubility of compounds with the use of different solvents. Then, extractants were added step by step to the weighted samples of sewage sludge weighing about 2 g each (in a volume 20 times greater than the weight of the weighted sample (40 ml)). Results. The results of the study show that polysaccharides are the dominant form of the organic fraction (polymers) in sewage sludge. Most heavy metals were identified in acidic polysaccharides, humic-like acids and lipids. Significant concentrations of phosphates were observed for the same components of polymer substances in the biomass of activated sludges. Conclusion. The products of extraction of polymer substances of the activated sludge biomass and the content of heavy metals in them may indicate the biosorption of heavy metals by zoogleal accumulations (having a polysaccharide structure) of activated sludges in aeration tanks during biological treatment. Therefore, extracellular biopolymers can be a “target” in the development of targeted technologies for the neutralization of activated sludges.

scholarly journals Efficiency Increase Method оf Biological Treatment оf Optical Mechanics Production Sewage

10.12737/215 ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 70-72
Author(s):  
Сироткин ◽  
A. Sirotkin ◽  
Суслова ◽  
S. Suslova ◽  
Хузяшева ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Sewage Treatment ◽  
Quantitative Composition ◽  
Qualitative And Quantitative ◽  
Laboratory Results ◽  
Efficiency Increase ◽  
Surface Active ◽  
Active Substances

Laboratory results of biological sewage treatment from ions of heavy metals and synthetic surface-active substances are discussed in this article. The data on dependence of cleared sewage’s qualitative and quantitative composition from the mixture sequence of sewage’s separate streams are obtained as a result of researches. Results on research of specific adsorption of metals by activated sludge biomass are presented. The estimated prevented ecological damage from dumping of polluting impurity to the river is calculated.

scholarly journals The present situation and trends of wastewater treatment in small settlements and rural areas of Lithuania

2019 ◽  
pp. 243-250
Author(s):  
Regimantas Dauknys
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Surface Waters ◽  
Rural Areas ◽  
Biological Treatment ◽  
Wastewater Treatment Plants ◽  
Present Situation ◽  
Treatment Facilities ◽  
Biological Filters ◽  
Activated Sludge Systems

This article presents the wastewater treatment in small settlements and rural areas ofLithuania, including descriptions of capacity and loading of wastewater treatment plants(WWTPs), types of treatment facilities, and development trends of biological treatmentfacilities. In 2000 Lithuania had 597 WWTPs with capacity up to 1000 m3/d, 95% of them arethe biological treatment plants. Today the most of these WWTPs are unloaded due to thetendency to centralise wastewater treatment in rural areas of Lithuania that were in the eightand ninth decades.In small settlements and rural areas of Lithuania the aeration facilities are predominant. In theeight and ninth decades practically only the activated sludge systems were built. The situationbegan to change in the last decade of the last century: the biological filters and soil filtrationfacilities with discharge into surface waters were applied more frequently, so the building ofaeration facilities started to decrease.

One-Sludge Denitri-Nitrification System Application in Reconstruction of Biological Treatment Stations in Russian Federation

2015 ◽  
Vol 725-726 ◽  
pp. 1325-1331 ◽  
Author(s):  
Elena Gogina ◽  
Olga Ruzhitskaya
Keyword(s):  
Activated Sludge ◽  
Russian Federation ◽  
System Application ◽  
Biological Treatment ◽  
Stable System ◽  
Treatment Facilities ◽  
The Russian Federation

The paper presents the main problems and their solutions in the reconstruction of treatment facilities in the Russian Federation. The paper presents the results of research aimed the use of the stable system, which is based on nitrification activated sludge appliance, when the sludge contains bacteria-heterotrophic-nitrificators.

Features of cyanobacterial-algal communities in artificial ecosystems of treatment facilities of Meleuz City

2021 ◽  
pp. 32-36
Author(s):  
Giuzel A. Gulamanova ◽  
Luiza Z. Teltsova
Keyword(s):  
Activated Sludge ◽  
Biological Treatment ◽  
Single Species ◽  
Organic Pollution ◽  
Arthrospira Platensis ◽  
Algal Communities ◽  
Number Of Species ◽  
Artificial Ecosystems ◽  
Treatment Facilities ◽  
The City

In this article, cyanoprokaryotes and algae of activated sludge of biological treatment facilities of the city of Meleuz were studied. The research revealed 27 species of algae and cyanoprokaryotes from 4 divisions. The leading class in terms of the number of species is Cyanophyceae: they accounted for 14 species, or 35.5% of the total number of species. In second place belongs to representatives of the class Bacillariophyceae (19.3%), followed by representatives of the class Chlorophyceae (12.9%). Four classes (Trebouxiophyceae, Mediophyceae, Coscinodiscophyceae, Euglenophyceae) were represented by single species. Most taxa below the class (orders, families, genera) are also represented by single species. The structure-forming species (the most common) include 3 species of cyanoprokaryotes: Microcystis aeruginosa, Oscillatoria planctonica, Arthrospira platensis. The number of saprobity indicator species (degree of organic pollution) was 18 species, or 58% of the total number of species. Indicators of all saprobic zones, except for xenosaprobic ones, were revealed. The degree of organic pollution was 2.96, which corresponds to the mesosaprobic zone. There is no correlation between the number of species and seasonality, and the communities are relatively stable. It can be concluded that the cyanoprokaryotic-algal communities of activated sludge of biological treatment facilities in the city of Meleuz are characterized by a poor species composition, with a predominance of zionoprokaryotes. The level of organic pollution corresponds to a moderately polluted area.

scholarly journals FENTON OXIDATION AS AN ALTERNATIVE TO BIOLOGICAL WASTEWATER TREATMENT

2020 ◽  
Author(s):  
T.M. Ganiev ◽  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Fenton Oxidation ◽  
Biological Wastewater Treatment ◽  
Cleaning Method ◽  
Advantages And Disadvantages ◽  
Treatment Facilities ◽  
Oxidation Reactor

This article discusses the possibility of replacing biological treatment units with activated sludge with a Fenton oxidation reactor. The main advantages and disadvantages of this cleaning method are determined. A possible scheme for the implementation of the project of treatment facilities operating on the principle of Fenton oxidation is considered.

DISINTEGRATION AND SOLUBILISATION OF ACTIVATED SLUDGE FROM RUBBER PROCESSING INDUSTRY BY OZONATION

2017 ◽  
Vol 80 (1) ◽  
Author(s):  
Siti Fatimah Zahra Mohd Sarif ◽  
Syifa' Syahida Alias ◽  
Fahmi Muhammad Ridwan ◽  
Che Zulzikrami Azner Abidin ◽  
Umi Fazara Md. Ali ◽  
...  
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Biological Treatment ◽  
Municipal Wastewater ◽  
Batch Process ◽  
Municipal Wastewater Treatment ◽  
Rubber Glove ◽  
Huge Amount ◽  
Processing Industry ◽  
Treatment Facilities

The activated sludge system is an effective biological treatment applied widely in both industrial and municipal wastewater treatment facilities worldwide. Yet, the big issue arising from this process is the huge amount of sludge production at the end of the process. Thus, this study was aimed at studying the sludge disintegration and solubilisation efficiency of activated sludge from rubber glove processing industry using ozonation. The ozonation was conducted in batch process, and the sample was analyzed after 10, 20, 30, 40, 50 and 60 minutes of contact time. It was found that ozone was able to cause the bacteria in the activated sludge to undergo lysis, which solubilised the organic matter. The settling property was improved with the SVI reduced from 103 to 79 mL/g. Ozonation at 40 minute with ozone consumption of 22.7 mgO3/gTSS was able to reduce SS, FS, and VSS to 16.6%, 19%, and 14%, respectively. The SCOD solubilisation was achieved at a maximum of 71.8%, while the nitrogenous compound of NH3-N was at 34% due to the release of organic matter from EPS and sludge cells after 60 minutes of treatment. A graph was plotted to evaluate the correlation between sludge disintegration and solubilisation, which showed a positive correlation (R2=0.970). Thus, ozonation was found to be an efficient method to disintegrate and solubilise the activated sludge from rubber processing industry.

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