Lacks and needs of R&D on wastewater treatment in small populations

2011 ◽  
Vol 6 (2) ◽  
Author(s):  
C. A. Aragón ◽  
J. J. Salas ◽  
E. Ortega ◽  
Y. Ferrer
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Small Towns ◽  
Small Populations ◽  
Research Groups ◽  
National Plan ◽  
Small Communities ◽  
Large Cities ◽  
Wide Range ◽  
New Treatment

Wastewater treatment in small communities, with less of 2,000 population equivalent, is one of the priorities of the new Spanish National Plan for Water Quality: Sanitation and Purification (2007-2015). Due to the peculiarities of the small agglomerations, the treatment solutions used in medium and large cities usually do not give satisfactory results if they are implanted directly into those communities. It is therefore necessary to adapt these technologies to the small towns or to search for new treatment solutions. In this regard, R&D activities play a key role. In fact, many research groups address their activities to the study of sanitation and treatment of small populations. In relation to the technologies studied there is a wide range that includes both extensive and intensive technologies. In the case of Spain, as in other countries, constructed wetlands seem to be the most studied technology in the recent years to sewage treatment in small settlements. However, there are still areas of study to be promoted in order to solve the current problems of sanitation and wastewater treatment in small settlements.

Analysis and description of sustainable solutions for wastewater treatment in small communities

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
J.J. Salas ◽  
C.A. Aragón ◽  
A. Real ◽  
E. Ortega ◽  
Y. Ferrer
Keyword(s):  
Wastewater Treatment ◽  
Public Works ◽  
Small Populations ◽  
Urban Wastewater ◽  
Small Communities ◽  
Large Cities ◽  
Sustainable Solutions ◽  
New Treatment ◽  
The Moment ◽  
Urban Wastewater Treatment

In Spain, the current level of conformity with the Directive 91/271/EEC, concerning urban wastewater treatment, has achieved an 80%. The remaining 20% are mainly agglomerations with less than 10,000 p.e., and more exactly, under 2,000 p.e. Only a 40-50% of the small populations have their sewage appropriately treated. It is estimated that the population not served at the moment is about 3-4 million p.e. In order to correct this non-desirable situation, the new National Plan for Water Quality, Sanitation and Purification 2007-2015 (NPWQ), provides concrete actions in small settlements (less than 2,000 p.e). Due to the peculiarities of the small agglomerations, the treatment solutions used in medium and large cities usually do not give satisfactory results if they are implanted directly into those communities. It is therefore necessary to adapt these technologies to the small settlements or to develop new treatment diagrams that allow obtaining a good quality effluent in a sustainable way. In this sense, the Centre for Studies and Experimentation of Public Works (CEDEX) and the Foundation Centre for New Water Technologies (CENTA) have prepared a “Manual for the implementation of treatment systems in small populations”. In this work, some of the most relevant issues included in the Manual are exposed.

Waste stabilisation ponds upgrading at Blenheim and Seddon, New Zealand - case studies

2003 ◽  
Vol 48 (2) ◽  
pp. 17-23
Author(s):  
H.E. Archer ◽  
S.A. Donaldson
Keyword(s):  
Wastewater Treatment ◽  
New Zealand ◽  
Lower Cost ◽  
Small Communities ◽  
Large Cities ◽  
Effluent Quality ◽  
Waste Stabilisation Ponds ◽  
Bank Protection ◽  
In Series ◽  
Final Effluent

Waste stabilisation ponds (WSP) have been a popular form of wastewater treatment in New Zealand both for large cities and small communities. Most WSP were constructed from 1960 to 1985 and were single ponds or a primary and secondary pond in series of similar size. Since 1995, improvements comprising primary and maturation ponds, with four to six cells in series have been constructed or retrofitted to original two cell ponds. The Seddon and Blenheim ponds include in-bank rock filters between maturation cells as a lower cost way of providing this feature for reduction of solids. Operating results show reduced variability in final effluent quality for BOD and SS. In addition, very good reductions of faecal coliform and enterococci have been achieved along with good reductions of ammonia and total nitrogen for most of the year except the middle of winter. Extensive use of rock as rip-rap bank protection and in the rock filters, appears to have provided sufficient extra surface area for a nitrifying biofilm to develop.

scholarly journals ULTRAVIOLET DISINFECTION AS AN ELEMENT OF MULTI-BARRIER APPROACH TO THE WATER TREATMENT FOR THE PROTECTION AGAINST CHLORINE-RESISTANT PATHOGENS

2019 ◽  
Vol 96 (6) ◽  
pp. 531-535
Author(s):  
Z. I. Zholdakova ◽  
E. A. Tulskaya ◽  
S. V. Kostuchenko ◽  
Andrey A. Tkachev
Keyword(s):  
Wastewater Treatment ◽  
Water Treatment ◽  
Wastewater Treatment Plants ◽  
Uv Disinfection ◽  
Ultraviolet Disinfection ◽  
Water And Wastewater Treatment ◽  
Large Cities ◽  
Disinfection Methods ◽  
Wide Range ◽  
Water And Wastewater

Ultraviolet disinfection is the most efficient mode in combination with other disinfection methods within multi-barrier approach for the water treatment. UV disinfection being effective against a wide range of pathogens including the chlorine-resistant (viruses and protozoa) significantly reduces chlorine byproducts. This paper presents a review of results of the implementation of multi-barrier lay-out with the application of UV disinfection at water and wastewater treatment plants of large cities: St. Petersburg and Nizhniy Novgorod.

scholarly journals Research of sewage intake of small settlements in dry weather

Vestnik MGSU ◽  
2019 ◽  
pp. 225-236 ◽  
Author(s):  
Irina I. Ivanenkо ◽  
Kseniya S. Senicheva
Keyword(s):  
Wastewater Treatment ◽  
Sewage Treatment ◽  
Full Scale ◽  
Leningrad Region ◽  
Design Practice ◽  
Daily Consumption ◽  
Sewage Treatment Plants ◽  
Large Cities ◽  
Treatment Technologies ◽  
Definition Of

Introduction. Attempts to apply classical wastewater treatment technologies to small volumes are often impossible due to the high irregularity of wastewater inflows, and fundamental fluctuations in the composition of wastewaters, which are very diverse in comparison with medium and large cities. At three sites located in the Leningrad Region, full-scale measurements of wastewater discharges from settlements with a population of 1000 people and an industrial enterprise were carried out in order to determine the irregularity coefficients of wastewater during the dry season. The irregularity coefficients used in the design practice for such objects differ greatly in their values, as determined in the process of analyzing the literature data, which, when designing head sewage treatment plants, can lead to significant errors in calculations. Materials and methods. Measurement of a daily consumption of sewage flowmeters counters, elimination of improbable values, definition of consumption in dry weather, comparison of these various objects. Results. Mathematical dependences are proposed for describing fluctuations in the daily coefficient of irregularity of waste during the year. It was proposed to describe the weekly fluctuation of expenses with the help of the weekly coefficient of non-uniformity and its values were determined for the studied objects. A method has been developed for determining estimated costs for small objects with a population of 1000 people. Conclusions. The developed technique allows to predict the size of coefficient of daily unevenness within a year in dry weather for small settlements with number of inhabitants of 1000 people and a small share of production drains. It is possible to recommend values of coefficients of week unevenness.

The Rhizopur® process ten years on: a green solution for sewage treatment in small communities

2011 ◽  
Vol 63 (8) ◽  
pp. 1614-1620 ◽  
Author(s):  
G. Aguilera Soriano ◽  
B. Raveneau-Champion ◽  
P. Dauthuille
Keyword(s):  
Constructed Wetlands ◽  
Sewage Treatment ◽  
Cost Effective ◽  
Small Towns ◽  
Operational Experience ◽  
Trickling Filter ◽  
Rotating Biological Contactor ◽  
Sludge Treatment ◽  
Small Communities ◽  
Green Solution

Ten years ago the Rhizopur® process was conceived in order to treat sewage from small towns. Since 1999 when the first Rhizopur® plant was commissioned, the number of facilities has been growing steadily and today there are more than fifty Rhizopur® facilities in France. This process combines three existing technologies, i.e. biofilm, infiltration/percolation and mineralisation in constructed wetlands, to conduct both wastewater and sludge treatment in a very cost-effective fashion. A trickling filter or a rotating biological contactor is combined with constructed wetlands to produce a high quality effluent, i.e. BOD5<20 mg/l, COD<100 mg/l and TSS<30 mg/l, and to achieve high removal efficiencies, i.e. BOD5 removal >90%, COD removal >80% and TSS removal >90%. Nitrification can also be achieved by increasing the size of the trickling filter. Part of the success of this process has been its modularity and compactness that have resulted in its easiness for extension, as well as its capacity to blend with the environment. The characteristics of this process make of it an appropriate solution for sewage treatment in the developing countries. The objective of this work is to give an overview of the performance and features of this process according to the operational experience gained during the last 10 years.

A step towards decentralized wastewater management in the Lower Jordan Rift Valley

2010 ◽  
Vol 61 (12) ◽  
pp. 3117-3128 ◽  
Author(s):  
M. van Afferden ◽  
J. A. Cardona ◽  
K. Z. Rahman ◽  
R. Daoud ◽  
T. Headley ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Rift Valley ◽  
Wastewater Management ◽  
Rural Sector ◽  
Urban Sector ◽  
Small Communities ◽  
Investigation Area ◽  
The Future ◽  
New Treatment ◽  
Water Strategy

In order to address serious concerns over public health, water scarcity and groundwater pollution in Jordan, the expansion of decentralized wastewater treatment and reuse (DWWT&R) systems to small communities is one of the goals defined by the Jordan government in the “Water Strategy 2009–2022”. This paper evaluates the general potential of decentralized wastewater system solutions to be applied in a selected area of the Lower Jordan Rift Valley in Jordan. For the study area, the connection degree to sewer systems was calculated as 67% (5% in the rural sector and 75% in the urban sector). The annual wastewater production available for DWWT&R in the rural sector of the investigation area was calculated to be nearly 3.8 million m3 at the end of 2007. The future need of wastewater treatment and reuse facilities of the rural sector was estimated to be increasing by 0.11 million m3 year−1, with an overall potential of new treatment capacity of nearly 15,500 population equivalents (pe) year−1. The overall potential for implementing DWWT&R systems in the urban sector was estimated as nearly 25 million m3 of wastewater in 2007. The future need of wastewater treatment and reuse facilities required for the urban sector was estimated to be increasing at a rate of 0.12 million pe year−1. Together with the decision makers and the stakeholders, a potential map with three regions has been defined: Region 1 with existing central wastewater infrastructure, Region 2 with already planned central infrastructure and Region 3 with the highest potential for implementing DWWT&R systems.

A step towards decentralized wastewater management in the Lower Jordan Rift Valley

2010 ◽  
Vol 10 (2) ◽  
pp. 181-192 ◽  
Author(s):  
M. van Afferden ◽  
J. A. Cardona ◽  
K. Z. Rahman ◽  
R. Daoud ◽  
T. Headley ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Rift Valley ◽  
Wastewater Management ◽  
Rural Sector ◽  
Urban Sector ◽  
Small Communities ◽  
Investigation Area ◽  
The Future ◽  
New Treatment ◽  
Water Strategy

In order to address serious concerns over public health, water scarcity and groundwater pollution in Jordan, the expansion of decentralized wastewater treatment and reuse (DWWT&R) systems to small communities is one of the goals defined by the Jordan government in the “Water Strategy 2009–2022”. This paper evaluates the general potential of decentralized wastewater system solutions to be applied in a selected area of the Lower Jordan Rift Valley in Jordan. For the study area, the connection degree to sewer systems was calculated as 67% (5% in the rural sector and 75% in the urban sector). The annual wastewater production available for DWWT&R in the rural sector of the investigation area was calculated to be nearly 3.8 million m3 at the end of 2007. The future need of wastewater treatment and reuse facilities of the rural sector was estimated to be increasing by 0.11 million m3 year−1, with an overall potential of new treatment capacity of nearly 15,500 population equivalents (pe) year−1. The overall potential for implementing DWWT&R systems in the urban sector was estimated as nearly 25 million m3 of wastewater in 2007. The future need of wastewater treatment and reuse facilities required for the urban sector was estimated to be increasing at a rate of 0.12 million pe year−1. Together with the decision makers and the stakeholders, a potential map with three regions has been defined: Region 1 with existing central wastewater infrastructure, Region 2 with already planned central infrastructure and Region 3 with the highest potential for implementing DWWT&R systems.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

Nanofiltration of endocrine disrupting compounds

2003 ◽  
Vol 3 (5-6) ◽  
pp. 321-327 ◽  
Author(s):  
M. Gallenkemper ◽  
T. Wintgens ◽  
T. Melin
Keyword(s):  
Wastewater Treatment ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Endocrine Disrupting Compounds ◽  
Municipal Wastewater Treatment ◽  
Water And Wastewater Treatment ◽  
Wide Range ◽  
Endocrine Disrupting ◽  
Municipal Wastewater Treatment Plants ◽  
Set Up

Endocrine disrupting compounds can affect the hormone system in organisms. A wide range of endocrine disrupters were found in sewage and effluents of municipal wastewater treatment plants. Toxicological evaluations indicate that conventional wastewater treatment plants are not able to remove these substances sufficiently before disposing effluent into the environment. Membrane technology, which is proving to be an effective barrier to these substances, is the subject of this research. Nanofiltration provides high quality permeates in water and wastewater treatment. Eleven different nanofiltration membranes were tested in the laboratory set-up. The observed retention for nonylphenol (NP) and bisphenol A (BPA) ranged between 70% and 100%. The contact angle is an indicator for the hydrophobicity of a membrane, whose influence on the permeability and retention of NP was evident. The retention of BPA was found to be inversely proportional to the membrane permeability.

Upgrading Wastewater Treatment by Water Hyacinth in Developing Countries

1990 ◽  
Vol 22 (7-8) ◽  
pp. 153-160 ◽  
Author(s):  
Pradeep Kumar ◽  
R. J. Garde
Keyword(s):  
Wastewater Treatment ◽  
Water Hyacinth ◽  
Treatment Plant ◽  
Cod Removal ◽  
Treatment System ◽  
Synthetic Wastewater ◽  
Second Phase ◽  
Treatment Unit ◽  
Batch Studies ◽  
New Treatment

With increasing stress on existing wastewater treatment systems, it is necessary either to upgrade the treatment unit(s) or install an entirely new treatment plant. Obviously, the upgrading is preferred over the alternative of having a new system. Keeping this in view, in the present project, an attempt has been made to explore the possibility of upgrading existing facultative ponds using water hyacinth. Bench-scale batch studies were designed to compare the performance of hyacinth treatment system with facultative ponds. Investigations were carried out with synthetic wastewater having COD in the range of 32.5-1090 mg/l. The efficiency of COD removal in water hyacinth ponds was 15-20 percent more than the facultative ponds. Based on the results, an empirical model has been proposed for COD removal kinetics. In the second phase of the project a hyacinth pond was continuously operated. BOD, COD, TS, TN, TP, pH, and DO were regularly monitored. However, the DO of the effluent from hyacinth treatment system was considerably reduced. Effluent should be aerated before it is discharged. The results indicate that the existing facultative ponds can be stalked with water hyacinth to improve their performance as well as hyacinth treatment systems can be installed to support the conventional treatment.

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