scholarly journals Contribution to the Treatment of Urban Wastewater in the City of Fez by Coagulation and Flocculation Using a Biodegradable Reagent

2022 ◽  
Vol 23 (2) ◽  
pp. 77-85
Author(s):  
Ibtissame Elmansouri ◽  
Amal Lahkimi ◽  
Mohamed Benaabou ◽  
Mehdi Chaouch ◽  
Noureddine Eloutassi ◽  
...  
1996 ◽  
Vol 34 (3-4) ◽  
pp. 223-233 ◽  
Author(s):  
Y. J. Shao ◽  
Anmin Liu ◽  
Wada Frank ◽  
John Crosse ◽  
David Jenkins

Advanced primary treatment (APT) is a process, in which chemicals are added to raw sewage to enhance total suspended solids (TSS) and biochemical oxygen demand (BOD5) removals by coagulation and flocculation. The City of Los Angeles Hyperion Treatment Plant (HTP) is the largest APT plant in the USA, servicing over 4 million people within an area of 1500 km2 and currently treating an average of 15 m3/s (350 MGD). HTP began using APT in 1986; current chemical doses to the raw sewage are 10 mg/l of FeCl3 and 0.15 mg/l of an extremely high molecular weight anionic polymer. The 1992 annual average influent TSS and BOD5 concentrations were both 330 mg/l and the APT removed an average 83% TSS and 51% BOD5 at an average surface overflow rate of 75 m/day (1900 gals/ft2,day). This paper discusses the overall performance of APT. The process is more cost effective than conventional primary treatment and its use can significantly reduce the size of the following secondary treatment process. APT is especially suitable for developing countries because of its low capital and operating costs.


2018 ◽  
Vol 2 (2) ◽  
pp. 393-415
Author(s):  
Cao Mu

ABSTRACTTianjin is the largest port city in Northern China and a major hub for water and land transportation. For geological reasons, the city has long been troubled by water drainage problems. To remove wastewater from within its walls, the city developed a drain system which relies on human labor and a series of variously sized ditches. Unlike the modern sewage system, which simply discharges wastewater into surrounding rivers and the sea, Tianjin's traditional wastewater disposal system worked in concert with an urban manure collection system. Urban wastewater was recycled as fertilizer, a valuable resource for the surrounding rural area. In tracing the origin, evolution, and influence of urban wastewater disposal in Tianjin, this article aims to reveal the potential value in Chinese traditional waste management practices. Contemporary urban waste disposal systems might benefit from a better understanding of the relationship between urban and rural areas that characterized these traditional practices.


10.14311/1223 ◽  
2010 ◽  
Vol 50 (4) ◽  
Author(s):  
K. Drnek

Prague’s sewerage system was built at the end of the era of the monarchy in the united town that Prague was transformed into. The system was soon overloaded, and was not able to remove all the sewage produced by the citizens.To deal with this hygienic threat, the city council and the management of the wastewater services undertook several actions to build a new system or improve the existing system. The most ambitious and extensive measure was the general project carried out between 1933 and 1936.The project was invented to resolve the problem once and for all by introducing new ideas and cut out the problem of placing a new sewage plant instead of the old one. For the present-day observer it also offers a range of spectacular and interesting ideas on urban wastewater treatment.


2020 ◽  
Author(s):  
Karin Yaniv ◽  
Marilou Shagan ◽  
Esti Kramarsky-Winter ◽  
Merav Weil ◽  
Victoria Indenbaum ◽  
...  

AbstractThe COVID-19 pandemic created a global crisis impacting not only healthcare systems, but also world economies and society. Recent data have indicated that fecal shedding of SARS-CoV-2 is common, and that viral RNA can be detected in wastewater. This suggests that wastewater monitoring is a potentially efficient tool for both epidemiological surveillance, and early warning for SARS-CoV-2 circulation at the population level. In this study we sampled an urban wastewater infrastructure in the city of Ashkelon, Israel, during the end of the first COVID-19 wave in May 2020 when the number of infections seemed to be waning. We were able to show varying presence of SARS-CoV-2 RNA in wastewater from several locations in the city during two sampling periods. This was expressed as a new index, Normalized Viral Load (NVL), which can be used in different area scales to define levels of virus activity such as red (high) or green (no), and to follow morbidity in the population at tested area. Our index showed the rise in viral load between the two sampling periods (one week apart) and indicated an increase in morbidity that was evident a month later in the population. Thus, this methodology may provide an early indication for SARS-CoV-2 infection outbreak in a population before an outbreak is clinically apparent.HIGHLIGHTSDetecting the presence of SARS-CoV-2 virus RNA in urban wastewaterThe city sewer system may provide an early indication for SARS-CoV-2 infection and may be used as early warning for SARS-CoV-2 outbreaksNVL index defines various infected urban zones from red (high) to green (low)Graphical abstract


1999 ◽  
Vol 27 (2) ◽  
pp. 202-203
Author(s):  
Robert Chatham

The Court of Appeals of New York held, in Council of the City of New York u. Giuliani, slip op. 02634, 1999 WL 179257 (N.Y. Mar. 30, 1999), that New York City may not privatize a public city hospital without state statutory authorization. The court found invalid a sublease of a municipal hospital operated by a public benefit corporation to a private, for-profit entity. The court reasoned that the controlling statute prescribed the operation of a municipal hospital as a government function that must be fulfilled by the public benefit corporation as long as it exists, and nothing short of legislative action could put an end to the corporation's existence.In 1969, the New York State legislature enacted the Health and Hospitals Corporation Act (HHCA), establishing the New York City Health and Hospitals Corporation (HHC) as an attempt to improve the New York City public health system. Thirty years later, on a renewed perception that the public health system was once again lacking, the city administration approved a sublease of Coney Island Hospital from HHC to PHS New York, Inc. (PHS), a private, for-profit entity.


ASHA Leader ◽  
2013 ◽  
Vol 18 (7) ◽  
pp. 46-48

This year's Annual Convention features some sweet new twists like ice cream and free wi-fi. But it also draws on a rich history as it returns to Chicago, the city where the association's seeds were planted way back in 1930. Read on through our special convention section for a full flavor of can't-miss events, helpful tips, and speakers who remind why you do what you do.


ASHA Leader ◽  
2017 ◽  
Vol 22 (7) ◽  
Author(s):  
Sean Sweeney
Keyword(s):  

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