Characterization of Sewage Sludge of Wastewater Treatment Plants in Alexandria

Sewage sludges produced from wastewater treatment plants continue to create environmental problems in terms of volume and method of valorization. Thermal treatment of sewage sludge is considered as an attractive method in reducing sludge volume which at the same time produces reusable by-products. This paper deals with the first step of activated carbon production from sewage sludge, the carbonization step. Experiments are carried out on viscous liquid sludge and limed sludge by varying carbonization temperature and heating rate. The results show that carbonized residue properties are interesting for activated carbon production.

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Occurrence of pharmaceutical active compounds in sewage sludge from two urban wastewater treatment plants and their potential behaviour in agricultural soils

Environmental Science Water Research & Technology ◽

10.1039/d1ew00132a ◽

2021 ◽

Author(s):

Sofia Silva ◽

João Rodrigues ◽

Rosário Coelho ◽

António Martins ◽

Eugénia Cardoso ◽

...

Keyword(s):

Wastewater Treatment ◽

Sewage Sludge ◽

Crop Yields ◽

Agricultural Soils ◽

Wastewater Treatment Plants ◽

Urban Wastewater ◽

Active Compounds ◽

Intensive Farming ◽

Urban Wastewater Treatment

Sewage sludge/biosolids are widely used in intensive farming to maintain fertility and enhance crop yields. Therefore, characterization of these matrices is necessary to ensure their safe use, especially regarding the...

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Agro-ecological Characterization of Vermicomposted Sewage Sludge from Municipal and Poultry Enterprise Wastewater Treatment Plants

Sains Malaysiana ◽

10.17576/jsm-2021-5008-03 ◽

2021 ◽

Vol 50 (8) ◽

pp. 2167-2178

Author(s):

Diyana Dermendzhieva ◽

Toncho Dinev ◽

Gergana Kostadinova ◽

Georgi Petkov ◽

Georgi Beev

Keyword(s):

Wastewater Treatment ◽

Sewage Sludge ◽

Wastewater Treatment Plants ◽

Poultry Meat ◽

Plate Count ◽

Lumbricus Rubellus ◽

Microbiological Analysis ◽

Salmonella Spp ◽

E Coli

The purpose of this study was to make an agro-ecological characterization of vermicompost (VC) produced from sewage sludge (SS). As a substrate, SS from municipal and poultry meat processing enterprise wastewater treatment plants (MTP and PTP, respectively) was utilized. The substrates were vermicomposted by Red Californian earthworm (Lumbricus rubellus) for 120 days. For VC quality assessment, 19 physicochemical and 6 microbiological parameters were used. The evaluation of physicochemical parameters was done according to ISO standard methods and microbiological analysis-by plating 1 mL of sample dilutions on selective, chromogenic culture medium sheets. It was found that the vermicompost from MTP (VC-M) had higher levels of EC, mineral elements (N, P and K compounds in forms available to plants), heavy metals (Mn, Cu, Zn, Cr, Ni, Pb, Cd) and coliforms, and lower levels of pH, TOC, C/N ratio, Fe, total plate count (TPC), Enterobacteriaceae and Salmonella spp. counts compared to VC from PTP (VC-P). During the vermicomposting process, the substrates from both wastewater treatment plants (TPs) showed similar trends towards decrease in pH, TOC, N-NH4+, C/N ratio, TPC, coliforms, E. coli, Enterobacteriaceae and Salmonella spp. counts, whereas the opposite trends were established for EC, TKN, N-NO3-, TP, P2O5, TK, and K2O values. The vermicomposting had a negligible effect on heavy metal concentrations. In the final substrates E. coli were not detected, while the bacterial spore forms (Clostridium perfringens) were not eliminated. The final substrates cannot be used as fertilizers or soil amendments because of the presence of Salmonella spp. and C. perfringens over the permissible limits according to EU and Bulgarian regulations.

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A FIELD STUDY OF FARMERS ADOPTION AND APPLICATION OF SEWAGE SLUDGE PRACTICES PRODUCED FROM WASTEWATER TREATMENT PLANTS IN AGRICULTURE AT SOME EGYPTIAN VILLAGES دراسة میدانیة لتبنی وتطبیق الزراع لممارسات استخدام الحمأة المنتجة من محطات معالجة میاه الصرف الصحی فی الزراعة ببعض القری المصریة

Journal of Agricultural Economics and Social Sciences ◽

10.21608/jaess.2015.40509 ◽

2015 ◽

Vol 6 (10) ◽

pp. 1599-1609

Author(s):

یحیى زهران ◽

محمد عبدالمجید ◽

أحمد حمزة

Keyword(s):

Wastewater Treatment ◽

Sewage Sludge ◽

Field Study ◽

Wastewater Treatment Plants

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Sludge minimization by disintegration at different wastewater treatment plants

Water Practice & Technology ◽

10.2166/wpt.2008.010 ◽

2008 ◽

Vol 3 (1) ◽

Author(s):

Luchien Luning ◽

Paul Roeleveld ◽

Victor W.M. Claessen

Keyword(s):

Organic Matter ◽

Wastewater Treatment ◽

Anaerobic Digestion ◽

Sewage Sludge ◽

New Technologies ◽

Wastewater Treatment Plants ◽

Treatment Plant ◽

Biological Degradation ◽

Ongoing Research ◽

Sludge Minimization

In recent years new technologies have been developed to improve the biological degradation of sewage sludge by anaerobic digestion. The paper describes the results of a demonstration of ultrasonic disintegration on the Dutch Wastewater Treatment Plant (WWTP) Land van Cuijk. The effect on the degradation of organic matter is presented, together with the effect on the dewatering characteristics. Recommendations are presented for establishing research conditions in which the effect of sludge disintegration can be determined in a more direct way that is less sensitive to changing conditions in the operation of the WWTP. These recommendations have been implemented in the ongoing research in the Netherlands supported by the National Institute for wastewater research (STOWA).

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Prediction of the O2 Conditions in the Selector

Water Science & Technology ◽

10.2166/wst.1994.0346 ◽

1994 ◽

Vol 29 (7) ◽

pp. 229-237 ◽

Cited By ~ 2

Author(s):

J. Kruit ◽

F. Boley ◽

L. J. A. M. Jacobs ◽

T. W. M. Wouda

Keyword(s):

Wastewater Treatment ◽

Pilot Plant ◽

Wastewater Treatment Plants ◽

Coarse Filter ◽

Plant Research ◽

Influent Characterization

Influent characterization and biosorption experiments were carried out with settled influent of seven wastewater treatment plants to study the influence of O2 in the selector in relation to the success of developing good settling properties of the sludge. In previous years working selectors were installed and/or pilot plant research was carried out at these wastewater treatment plants. Characterization of the influent was done with help of standard COD and BOD measurements with help of a coarse filter. The research has elucidated that the presence of O2 in the selector, at initial sludge loadings of 3.5-6.5 kg BOD/kg MLSS.d, is important for producing good settling properties of the sludge when the sum of readily biodegradable COD and rapidly hydrolysable COD is greater than 40%. When the sum of sludge COD and slow hydrolysable COD is greater than 50% an unaerated selector can be used.

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The first sequenced Sphaerotilus natans bacteriophage– characterization and potential to control its filamentous bacterium host

FEMS Microbiology Ecology ◽

10.1093/femsec/fiab029 ◽

2021 ◽

Vol 97 (4) ◽

Author(s):

Rute Ferreira ◽

Rui Amado ◽

Jorge Padrão ◽

Vânia Ferreira ◽

Nicolina M Dias ◽

...

Keyword(s):

Wastewater Treatment ◽

Bacterial Communities ◽

Potential Application ◽

Deleterious Effect ◽

Wastewater Treatment Plants ◽

Lytic Phage ◽

Filamentous Bacterium ◽

Sphaerotilus Natans ◽

Isolation And Characterization

ABSTRACT Bacteriophages (phages) are ubiquitous entities present in every conceivable habitat as a result of their bacterial parasitism. Their prevalence and impact in the ecology of bacterial communities and their ability to control pathogens make their characterization essential, particularly of new phages, improving knowledge and potential application. The isolation and characterization of a new lytic phage against Sphaerotilus natans strain DSM 6575, named vB_SnaP-R1 (SnaR1), is here described. Besides being the first sequenced genome of a Sphaerotilus natans infecting phage, 99% of its 41507 bp genome lacks homology with any other sequenced phage, revealing its uniqueness and previous lack of knowledge. Moreover, SnaR1 is the first Podoviridae phage described infecting this bacterium. Sphaerotilus natans is an important filamentous bacterium due to its deleterious effect on wastewater treatment plants (WWTP) and thus, phages may play a role as novel biotechnological tools against filamentous overgrowth in WWTP. The lytic spectrum of SnaR1 was restricted to its host strain, infecting only one out of three S. natans strains and infection assays revealed its ability to reduce bacterial loads. Results suggest SnaR1 as the prototype of a new phage genus and demonstrates its potential as a non-chemical alternative to reduce S. natans DSM 6575 cells.

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Detection and molecular characterization of enteric adenovirus in treated wastewater in the Brazilian Federal District

SN Applied Sciences ◽

10.1007/s42452-021-04678-2 ◽

2021 ◽

Vol 3 (7) ◽

Author(s):

T. S. C. Quintão ◽

F. G. Silva ◽

A. L. Pereira ◽

W. N. Araújo ◽

P. M. Oliveira ◽

...

Keyword(s):

Phylogenetic Analysis ◽

Wastewater Treatment ◽

Wastewater Treatment Plants ◽

Federal District ◽

Treated Wastewater ◽

Conventional Pcr ◽

Rainfall Index ◽

Enteric Adenovirus ◽

Enteric Adenoviruses

AbstractHuman enteric viruses, such as enteric adenoviruses (HAdV), are known to be involved with gastrointestinal disorders, especially acute gastroenteritis. Several studies have used HAdV as an indicator of water quality, since they are considered highly stable and widely distributed viruses in water matrices. The aim of this study was to detect and genotype HAdVs in water matrices impacted by discharges of treated effluents from wastewater treatment plants (WWTPs). Wastewater treatment plants from the sanitary system of the Brazilian Federal District were assessed in 2018 and 2019. Samples were collected upstream and downstream from discharge points for each WWTP. Viral concentration based on adsorption-elution and conventional PCR was used for molecular detection, and positive samples were sequenced for phylogenetic analysis. Pluviosity data for the period in which the samples were collected were obtained. Our results demonstrated the presence of HAdVs in 27.2% (61/224) of the samples. The positivity was significantly higher in downstream samples compared to upstream. Moreover, the HAdV positivity was higher in downstream samples collected from receiving water bodies impacted by secondary-level WWTPs in comparison with those impacted by tertiary-level WWTPs. Phylogenetic analysis demonstrated the presence of genotypes 40 and 41, with prevalence of HAdV genotype 41. Despite the predominance of HAdV-41, an increasing frequency of the HAdV-40 was associated with higher pluviosity. In conclusion, this study is the first documentation in the Brazilian Federal District dealing with the prevalence and diversity of HAdVs in several WWTP, along with their correlation with rainfall index.

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