Design and Operation of Small Wastewater Treatment Plants by the Microbial Film Process

1990 ◽  
Vol 22 (3-4) ◽  
pp. 139-144 ◽  
Author(s):  
S. Iwai ◽  
Y. Oshino ◽  
T. Tsukada
Keyword(s):  
Urban Areas ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Small Scale ◽  
Small Communities ◽  
Fishing Villages ◽  
Sewer Systems ◽  
Water Treatment Plants ◽  
History Of ◽  
Microbial Film

Although the ratio of sewer systems to population in Japan has been improving in recent years, the construction of sewer systems in small communities such as farming or fishing villages, etc. had lagged behind that of urban areas. However, construction of small-scale sewer systems in farming and fishing villages has been actively carried out in recent years. This report explains the history of the promotion of small-scale sewer systems, why submerged filter beds are being employed in many cases, and introduces the design, operation and maintenance of representative waste-water treatment plants in farming and fishing villages which incorporate de-nitrogen and dephosphorization.

Characterization of Free and Bound PBDEs in Sewage Sludge from Waste Water Treatment Plants (WWTPs) of Shanghai

2013 ◽  
Vol 864-867 ◽  
pp. 1993-1996
Author(s):  
Li Zao Liu ◽  
Yue Li ◽  
Jing Yang
Keyword(s):  
Waste Water ◽  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Dry Weight ◽  
Molecular Weights ◽  
Water Treatment Plants ◽  
Farmland Soils ◽  
Sludge Application

In this study, sewage sludge samples were collected from 25 wastewater treatment plants (WWTPs) in Shanghai, and free and bound PBDEs were extracted in different ways. The concentrations of free and bound PBDEs were in the range of 111.69 to 13119.59 ng/g dry weight (dw) and 4.30 to 60.17 ng/g dw, respectively. BDE209 were the dominate congener and the concentrations of free and bound BDE209 ranged from 89.64 to 12424.84 ng/g dw and 0.85 to 44.00 ng/g dw, respectively. The concentrations of bound PBDEs were quite stable, indicating bound PBDEs werent high related with the input of total PBDEs. The fractions of bound PBDE congeners increased with the numbers of Br atoms, which suggested that PBDE congeners with low molecular weights were more prone to desorb from micro-pores of organic matters in sewage sludge. The fractions of bound PBDEs in total PBDEs were in the range of 0.16 to 22.73%, suggesting bound PBDEs played an important role in farmland soils after sludge application.

scholarly journals Hydrogeological Criteria to Improve the Sponge City Strategy of China

2021 ◽  
Vol 9 ◽  
Author(s):  
Mengxiao Jin ◽  
Michele Lancia ◽  
Yong Tian ◽  
Stefano Viaroli ◽  
Charles Andrews ◽  
...  
Keyword(s):  
Urban Areas ◽  
Waste Water Treatment ◽  
Green Roofs ◽  
Rain Gardens ◽  
Hydraulic Characteristics ◽  
Sponge City ◽  
Water Treatment Plants ◽  
Direct Infiltration ◽  
The Government

China is facing frequent waterlogging and an increasing water scarcity that mirrors the fast urban and economic expansion of the last 4 decades. To mitigate these issues, the government promulgated the “Sponge City” strategy; a concept rooted in practices in western countries aimed at collecting and reusing 65–90% of urban rainfall. The application consists of absorbent infrastructures such as green roofs and rain gardens combined with the pre-existing urban environment. However, due to climate heterogeneities and the different urbanization contexts in China, these goals may seem overly ambitious in many areas of the country. Compact urbanization, together with heavy rainfall concentrated in short events, puts dramatic stresses on these infrastructures. At the same time, overdesigned infrastructures are expensive and may not be practical to retrofit in existing urban areas. In this paper, the role of urban aquifers as natural Sponge City elements are investigated throughout China. The method of implementation is inexpensive and easy to apply, favoring the direct infiltration to the subsoil after the conversion of the urban surfaces from impervious to permeable. Infiltration to urban aquifers alleviates the pressure on sewers, urban streams, as well as waste-water treatment plants. Considering urban aquifers with different hydraulic characteristics, water table dynamics after large infiltration events from rainfall are simulated via numerical analysis. Hydrogeological and geomorphological analyses are carried out to individuate criteria for the mapping of high absorbance areas at the regional and local scales. A Sponge City approach involving the urban aquifers can represent a winning formula for the success of this ambitious but compelling plan.

The Experience and the Results of Operating Small Wastewater Treatment Plants

1990 ◽  
Vol 22 (3-4) ◽  
pp. 267-273
Author(s):  
Mitja Rismal
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Energy Consumption ◽  
Water Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Water Jet ◽  
Rotating Discs ◽  
Water Treatment Plants

About 15 years of experience gained from operating 7 small waste water treatment plants between 150-500 p.e. and 6 plants of 2000-3000 p.e. capacity are described. All of the plants involved are low-loaded activated sludge plants with water jet aeration generated by screw or propeller pumps which both proved to be efficient in aeration while secure and simple in operation. In comparison with other types of small treatment plants in our country (rotating discs and bubble aeration activated sludge plants), they proved to be reliable and simple in operation and produce an effluent of good quality. The energy consumption and the necessary flow velocites in aeration tanks are computed and measured.

scholarly journals ENVIRONMENTAL EXERGY ANALYSIS OF WASTEWATER TREATMENT PLANTS

2006 ◽  
Vol 5 (2) ◽  
pp. 24 ◽  
Author(s):  
C. B. H. Mora ◽  
S. De Oliveira Jr
Keyword(s):  
Waste Water ◽  
Wastewater Treatment ◽  
Water Treatment ◽  
Environmental Impact ◽  
Environmental Performance ◽  
Exergy Analysis ◽  
Wastewater Treatment Plants ◽  
Waste Water Treatment ◽  
Exergy Efficiency ◽  
Water Treatment Plants

This work evaluates the environmental impact of Wastewater Treatment Plants (WTP) based on data generated by the exergy analysis, calculating and applying environmental impact indexes for two WTP located in the Metropolitan Area of São Paulo. The environmental impact of the waste water treatment plants was done by means of evaluating two environmental impact exergy based indexes: the environmental exergy efficiency (ηenv,exerg) and the total pollution rate (Rpol,t). The environmental exergy efficiency is defined as the ratio of the exergy of the useful effect of the WTP to the total exergy consumed by human and natural resources, including all the exergy inputs. That relation is an indication of the theoretical potential of future improvements of the process. Besides the environmental exergy efficiency, it is also used the total pollution rate, based on the definition done by Makarytchev (1997), as the ratio of the destroyed exergy associated to the process wastes to the exergy of the useful effect of the process. The analysis of the results shows that this method can be used to quantify and also optimise the environmental performance of Wastewater Treatment Plants.

Urban Drainage Strategies for Small Communities in Developing Countries

1990 ◽  
Vol 22 (3-4) ◽  
pp. 283-283
Author(s):  
Matthias Grottker ◽  
Amar Khelil
Keyword(s):  
Waste Water ◽  
Developing Countries ◽  
Waste Water Treatment ◽  
Drainage System ◽  
Urban Drainage ◽  
Industrialized Countries ◽  
Local Conditions ◽  
Small Communities ◽  
Water Treatment Plants ◽  
Catchment Areas

In this paper, the interactions of small waste water treatment plants within an urban drainage system are pointed out. Especially in developing countries, the characteristics of catchment areas differ very much from the ones in industrialized countries. Consequently, the plants have to be adapted to the local conditions of drainage, climate and location. Finally, an urban drainage strategy will give an idea how to sanitize drainage systems.

Innovative technologies for decentralised water-, wastewater and biowaste management in urban and peri-urban areas

2004 ◽  
Vol 48 (11-12) ◽  
pp. 23-32 ◽  
Author(s):  
R. Otterpohl ◽  
U. Braun ◽  
M. Oldenburg
Keyword(s):  
Urban Areas ◽  
Waste Water Treatment ◽  
Source Control ◽  
Small Scale ◽  
Major Step ◽  
Adequate Treatment ◽  
Cycle Systems ◽  
New Ideas ◽  
Cost Efficient ◽  
Almost All

Avoiding the comingling of water flows coming from different sources and thus obtaining flows with a very low dilution factor is the first and major step key to technical solutions for adequate treatment of household wastewaters. Through their decentral structure and effective recovery of water, energy and fertiliser these systems can be highly cost efficient. Fresh water consumption can be reduced by up to 80% while nutrients can be recovered to a large extent. Source control is also advantageous for hygienic reasons: low volumes are far easier to sanitise. Source separation technology in municipal waste water treatment does often lead decentralised or semicentral systems. The first essential step is the separate collection and treatment of toilet waste in households, which contains almost all pathogens and nutrients. New toilet systems with very low dilution factors, ranging from vacuum- through urine sorting to dry toilets, have been introduced in several projects and proven feasible. New ideas such as the black- and greywater cycle systems are presently under research at the Technical University Hamburg Harburg. Such modular, integrated and small scale systems are only possible through recent advances in membrane technology and, due to their small scale, do have the potential to be installed in densely populated regions. These technologies are options for following the principles of ecological sanitation, to contain, to sanitise and to reuse also in urban areas (EcoSanRes, 2003).

scholarly journals Impacts of onsite greywater reuse on wastewater systems

2017 ◽  
Vol 75 (8) ◽  
pp. 1862-1872 ◽  
Author(s):  
Roni Penn ◽  
Manfred Schütze ◽  
Jens Alex ◽  
Eran Friedler
Keyword(s):  
Urban Areas ◽  
Process Model ◽  
Field Experiments ◽  
Wastewater Treatment Plants ◽  
Domestic Wastewater ◽  
Sewer Systems ◽  
Case Study Site ◽  
Wastewater Systems ◽  
Greywater Reuse

Together with significant water savings that onsite greywater reuse (GWR) may provide, it may also affect the performance of urban sewer systems and wastewater treatment plants (WWTPs). In order to examine these effects, an integrated stochastic simulation system for GWR in urban areas was developed. The model includes stochastic generators of domestic wastewater streams and gross solids (GSs), a sewer network model which includes hydrodynamic simulation and a GS transport module, and a dynamic process model of the WWTP. The developed model was applied to a case study site in Israel. For the validation of the sewer simulator, field experiments in a real sewer segment were conducted. The paper presents the integration and implementation of these modules and depicts the results of the effects of various GWR scenarios on GS movement in sewers and on the performance of the WWTP.

Craft Beer's Unlikely Alchemist

2019 ◽  
Vol 19 (4) ◽  
pp. 78-90
Author(s):  
Theresa McCulla
Keyword(s):  
San Francisco ◽  
Assembly Line ◽  
The United States ◽  
Risk Tolerance ◽  
Small Scale ◽  
Intellectual Curiosity ◽  
Brewing Industry ◽  
Washing Machine ◽  
Craft Beer ◽  
History Of

In 1965, Frederick (Fritz) Maytag III began a decades-long revitalization of Anchor Brewing Company in San Francisco, California. This was an unexpected venture from an unlikely brewer; for generations, Maytag's family had run the Maytag Washing Machine Company in Iowa and he had no training in brewing. Yet Maytag's career at Anchor initiated a phenomenal wave of growth in the American brewing industry that came to be known as the microbrewing—now “craft beer”—revolution. To understand Maytag's path, this article draws on original oral histories and artifacts that Maytag donated to the Smithsonian Institution's National Museum of American History via the American Brewing History Initiative, a project to document the history of brewing in the United States. The objects and reflections that Maytag shared with the museum revealed a surprising link between the birth of microbrewing and the strategies and culture of mass manufacturing. Even if the hallmarks of microbrewing—a small-scale, artisan approach to making beer—began as a backlash against the mass-produced system of large breweries, they relied on Maytag's early, intimate connections to the assembly-line world of the Maytag Company and the alchemy of intellectual curiosity, socioeconomic privilege, and risk tolerance with which his history equipped him.

Study of Diabetic Mellitus and Knowledge of Lotion Foot Care on the Community

2018 ◽  
Vol 9 (3) ◽  
Author(s):  
Hariyadi DM ◽  
Athiyah U ◽  
Hendradi E ◽  
Rosita N ◽  
Erawati T ◽  
...  
Keyword(s):  
Blood Glucose ◽  
T Test ◽  
Small Scale ◽  
Scale Production ◽  
Foot Care ◽  
Diabetic Mellitus ◽  
Glucose Levels ◽  
Blood Glucose Levels ◽  
Before And After ◽  
History Of

The prevention of Diabetic Mellitus (DM) and its complications is the main aim of this study, in addition to the training of lotion foot care application and the development of small scale industry. The research team delivered knowledge in the form of training on Diabetic Mellitus, healthy food, treatment and prevention of complications, and small-scale production of cosmetic products. The aim of this study was to determine the correlation between training on diabetic and lotion foot care application as preventive measures against diabetic complications on the patient's blood glucose levels in the community of residents in Banyuurip Jaya, Surabaya. It was expected from this training that the knowledge of the residents increases and people living with diabetic undergo lifestyle changes and therefore blood sugar levels can be controlled. The parameters measured in this research were blood glucose levels, the anti diabetic drug types consumed, and compliance on diabetics. This study used the data taken from 60 patients with DM over a period of one month. Questionnaires and log books was used to retrieve data and changes in blood glucose levels in diabetic patients. The results showed the demographic data of patients with type 2 diabetic of 85% female and 15% male, with the range of patients aged of 61-70 years of 46.67% and had history of diabetic (90%). The history of drugs consumed by respondents was anti diabetic drugs such as metformin (40%), glimepiride (33.37%) and insulin (6.67%). In addition, the increased knowledge of DM patients after being given the training compared to before training was shown in several questions in the questionnaire. A statistical analysis using t-test analyzed a correlation between training provided in order to enhance understanding of the patient, as well as correlation with blood glucose levels. A paired T-test showed that there was a relationship between the knowledge of trainees before and after training (p less than 0.05). An interesting result was that there was no relationship between blood glucose levels before and after training provided (p> 0.05).

Hastings Donnan and Pnina Werbner (eds). Economy and Culture in Pakistan: Migrants and Cities in a Muslim Society. London: Macmillan. 1991. 268 pp.

1992 ◽  
Vol 31 (3) ◽  
pp. 325-328
Author(s):  
Ziaul Haque
Keyword(s):  
Urban Areas ◽  
Political System ◽  
Direct Result ◽  
The Political ◽  
Economic Factors ◽  
Population Movements ◽  
Social Fabric ◽  
History Of ◽  
Political Divide ◽  
Different Parts

Modem economic factors and forces are rapidly transforming the world into a single society and economy in which the migration of people at the national and international levels plays an important role. Pakistan, as a modem nation, has characteristically been deeply influenced by such migrations, both national and international. The first great exodus occurred in 1947 when over eight million Indian Muslims migrated from different parts of India to Pakistan. Thus, from the very beginning mass population movements and migrations have been woven into Pakistan's social fabric through its history, culture and religion. These migrations have greatly influenced the form and substance of the national economy, the contours of the political system, patterns of urbanisation and the physiognomy of the overall culture and history of the country. The recent political divide of Sindh on rural/Sindhi, and urban/non-Sindhi, ethnic and linguistic lines is the direct result of these earlier settlements of these migrants in the urban areas of Sindh.

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