Microbiological quality of residues from drinking water preparation

1995 ◽  
Vol 31 (5-6) ◽  
pp. 75-79 ◽  
Author(s):  
M. Würzer ◽  
A. Wiedenmann ◽  
K. Botzenhart
Keyword(s):  
Waste Water ◽  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Drinking Water ◽  
Water Treatment ◽  
Pathogenic Bacteria ◽  
Waste Water Treatment ◽  
Microbiological Quality ◽  
Detection Limits

In Germany the application of procedures such as flocculation and filtration in the preparation of drinking water results in the annual production of an estimated 500,000 t of sediments and sludges. Some of these residues have a potential for being reused, for example in agriculture, forestry, brickworks or waste water treatment. To assess the microbiological quality of residues from waterworks methods for the detection of enterobacteria, Escherichia coli, Salmonella, Pseudomonas aeruginosa, Legionella, poliovirus, Ascaris suis eggs and Cryptosporidium have been evaluated regarding their detection limits and were applied to various residues from German waterworks. Results show that sediments and sludges may contain pathogenic bacteria, viruses and protista. When residues from waterworks are intended to be reused in agriculture or forestry the microbiological quality should therefore be considered.

scholarly journals EFFECT OF APPLICATION TREAEED WATER AND DRY SLUDGE ON SIIL CONTAMINATION WITH PATHOGENIC BACTREIA

2016 ◽  
Vol 47 (2) ◽  
Author(s):  
Shaker & Abd Alhameed
Keyword(s):  
Waste Water ◽  
Pseudomonas Aeruginosa ◽  
Water Treatment ◽  
Soil Contamination ◽  
Fecal Coliform ◽  
Pathogenic Bacteria ◽  
Tap Water ◽  
Waste Water Treatment ◽  
Silty Clay ◽  
Fecal Streptococci

Research was conducted to assess the effect of  treated waste water  and dry sludge application on soil contamination by some pathogenic bacteria such as Pseudomonas aeruginosa , Fecal coliform and Fecal streptococci, which used as an indicator organisms for soil contamination by bathogenic bacteria. Composting sludge (T2) and non composting dry sludge (T1) applied to soil  to assess the effect of compost of sludge on the number of pathogenic bacteria and soil contamination . Research consisted to identification and enumeration. The three pathogenic bacteria were examined at the mid and end of cultivation season. Factorial experiment with three replicate, using waste water treatment (W2) as a source of irrigation water, compared with tap water (W1).Composting sludge(T2) and non-composting sludge (T1), added and mixed with soil in three different levels 0, 30 , 60 ton .ha-1 .Pancium milicine  was cultivated in pots weighted 10 Kg of silty clay loam soil. Results showed that the number of pathogenic bacteria Pseudomonas aeruginosa, Fecal coliform and Fecal streptococci. Were increased significantly with soil irrigated with waste water treatment, giving 5.88, 5.48 and 5.37 log cfu g-1dry soil respectively,compared with tap water 4.45, 4.29 and 2.97 log cfu g-1dry soil respectively. Results showed also significantly increment in the number of pathogenic bacteria with increase rate of dry sludge utilized to soil. The rate 60 ton.ha-1 was the highest number of pathogenic bacteria in soil 6.21, 5.78 and 5.24 log cfu g-1dry soil respectively. Results showed reduced in the number of pathogenic bacteria in composting sludge compared with non-composting sludge, with reduced proportion of 9.78 , 6.67 and 8.50 % respectively.                                            

scholarly journals Cyclopentane hydrate-based processes for treating heavy metal containing wastewater

2019 ◽  
Vol 118 ◽  
pp. 04039
Author(s):  
Yamei Yang ◽  
Hang Zhou ◽  
Feng Li ◽  
Changrui Shi ◽  
Shuai Wang ◽  
...  
Keyword(s):  
Waste Water ◽  
Heavy Metal ◽  
Water Treatment ◽  
Enrichment Factor ◽  
Treatment Process ◽  
Waste Water Treatment ◽  
Water Recovery ◽  
Water Treatment Process ◽  
Metal Recycling

The scarcity of water and increasing water pollution are the pressing challenge human being facing. Recovering water and valuable heavy metals is highly desired for treating heavy metal containing wastewater. We proposed a novel hydrate-based process to treat Ni2+ containing wastewater. The water recovery, Ni2+ enrichment factor, desalination efficiency were studied using this cyclopentane hydrate-based method. A water recovery of 43% can be obtained with a desalination efficiency of round 88% and an enrichment factor of 1.6. The desalination efficiency and the quality of the as-made water via the hydrate-based process can be further improved to above 99% via three-stage hydrate reaction. The proposed hydrate-based water treatment process may find wide applications in waste water treatment and heavy metal recycling.

scholarly journals Efficiency of application of the microbiological method of waste water treatment to remove hexamethylendiamine

2021 ◽  
Vol 6 (1) ◽  
pp. 28-32
Author(s):  
Valeriia Lytvynenko ◽  
◽  
Alina Dychko ◽  
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Water Treatment ◽  
Waste Water Treatment ◽  
Microbiological Method ◽  
Bacterial Cultures ◽  
Quality Of Water ◽  
Nutrition Source

Wastewater contaminated with hexamethylenediamine (HMD), which is discharged into natural reservoirs, causes damage and loss of hydrobionts, worsens the quality of water which becomes unsuitable for use. For wastewater treatment from HMD, the possibility of applying bacterial cultures-destructors which use the HMD as a nutrition source is considered.

Microbiological Quality of Hot Meals Served by Airlines

1998 ◽  
Vol 61 (8) ◽  
pp. 1052-1056 ◽  
Author(s):  
MAIJA HATAKKA
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Clostridium Perfringens ◽  
Pathogenic Bacteria ◽  
Microbiological Quality ◽  
Geometric Means ◽  
E Coli ◽  
The World ◽  
And Staphylococcus Aureus

The microbiological quality of 1,012 hot meals served on aircraft was studied in 1991 to 1994. The material included dishes prepared in 33 countries all over the world. The geometric means of aerobic colony counts and Escherichia coli were significantly lower in breakfasts (P < 0.05) than in main dishes. Pathogenic bacteria were found in 30 samples (3.0%), Bacillus cereus being the most common pathogen. The frequencies of B. cereus and Staphylococcus aureus did not differ between breakfasts and main dishes. Many of the samples exceeded the minimum acceptable microbiological standards recommended by the Association of European Airlines (AEA) for E. coli, S. aureus, B. cereus, Clostridium perfringens, and Salmonella; i.e., 8.2%, 0.6%, 0.7%, 0.7% and 0.3%, respectively. There were considerable differences in aerobic colony counts and E. coli counts between countries where the food was prepared.

Polar Organic Pollutants on Their Way from Waste Water to Drinking Water

1992 ◽  
Vol 25 (11) ◽  
pp. 241-248 ◽  
Author(s):  
H. Fr. Schröder
Keyword(s):  
Waste Water ◽  
Drinking Water ◽  
Water Treatment ◽  
High Performance ◽  
Waste Water Treatment ◽  
Sewage Treatment ◽  
Drinking Water Treatment ◽  
Mass Spectrometers ◽  
Water Treatment Process ◽  
On Line

The examination of pollutants in waste-, surface- and drinking water by sum parameters like COD, BOD or TOC gives no information about their toxicity or behaviour in the drinking water treatment process. As many pollutants leaving sewage treatment plants are polar and/or thermolabile, gas Chromatographic (GC) separation coupled on-line with a mass spectrometer (MS) is not applicable to this problem. Newly established analytical methods like high performance liquid chromatography (HPLC) in on-line combination with mass- (MS) or tandem mass spectrometers (MS/MS) using soft ionization techniques like thermospray (TSP) would help to solve these problems. The comparison of GC- and LC/MS-spectra demonstrates increasing polarity beginning at the waste water treatment and ending at the drinking water treatment. It was possible to identify and quantify selected compounds, and elimination efficiency could be reviewed by comparing overview spectra. The knowledge about the existence of these compounds in waste-, surface- and drinking water requires strategies for elimination, avoidance or degradation.

Microbiological Quality of Sushi from Sushi Bars and Retailers

2008 ◽  
Vol 71 (4) ◽  
pp. 860-864 ◽  
Author(s):  
VIKTORIA ATANASSOVA ◽  
FELIX REICH ◽  
GÜNTER KLEIN
Keyword(s):  
Escherichia Coli ◽  
Health Risks ◽  
Pathogenic Bacteria ◽  
Microbiological Quality ◽  
Potential Health ◽  
Animal Products ◽  
Raw Fish ◽  
And Staphylococcus Aureus ◽  
Microbiological Status

Sushi is a traditional Japanese food, mostly consisting of rice and raw fish. Fish is considered a healthy food, but as with other animal products, consumption of raw muscle incurs potential health risks such as ingestion of pathogenic bacteria or parasites. In this study, 250 sushi samples were analyzed for their microbiological status and the prevalence of pathogenic bacteria. A comparison was made between frozen sushi from supermarkets and fresh sushi from sushi bars. Aerobic mesophilic bacteria counts differed for sushi from these two sources, with means of 2.7 log CFU/g for frozen sushi and 6.3 log CFU/g for fresh sushi. The prevalence of Escherichia coli and Staphylococcus aureus was higher in the fresh samples. Salmonella was found in four (1.6%) of the sushi samples, and Listeria monocytogenes was found in three (1.2%) of the samples. These results indicate that the microbiological quality of industrially processed sushi is higher than that of freshly prepared sushi. The quality of freshly prepared sushi strongly depends on the skills and habits of the preparation cooks, which may vary.

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