Sustainable sewage treatment plants - application of nanofiltration and ultrafiltration to a pressurized bioreactor

1996 ◽  
Vol 34 (3-4) ◽  
pp. 389-394 ◽  
Author(s):  
Kh. Krauth
Keyword(s):  
New Technology ◽  
Sewage Treatment ◽  
Biomass Concentration ◽  
Nanofiltration Membrane ◽  
Excess Sludge ◽  
Sewage Treatment Plants ◽  
The University ◽  
High Biomass Concentration ◽  
Very High

Based on earlier studies and experiences the Institute of Sanitary Engineering, Water Quality and Waste Management at the University of Stuttgart has developed a new technology to purify wastewater to a quality suitable for reuse as industrial water. This technology consists of a pressurized bioreactor under 3 bar with an ultrafiltration unit for sludge retention coupled with a nanofiltration unit. The concentrate retained in the nanofiltration is fed back to the bioreactor resulting in an enhanced biodegradability and a better quality of the effluent. The flux through the ultrafiltration membrane ranged from 100 to 200 l/(m3h); that through the nanofiltration membrane was around 0.05 l/(m3h). While attaining a very high biomass concentration (20 to 40 kg MLVSS/m3) in the bioreactor the excess sludge production is remarkably small with 0.7 to 1.0% of the influent COD.

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operation

2008 ◽  
Vol 37 (2) ◽  
Author(s):  
Maciej Walczak
Keyword(s):  
Water Quality ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sewage Treatment Plants ◽  
Plant Operation ◽  
Treated Sewage ◽  
Microbiological Parameters ◽  
Microbial Indices

Changes of microbial indices of water quality in the Vistula and Brda rivers as a result of sewage treatment plant operationThis paper reports the results of studies of microbiological changes in the water quality of the Vistula and Brda rivers after the opening of sewage treatment plants in Bydgoszcz. The study involved determining the microbiological parameters of water quality. Based on the results obtained, it was found that the quality of the water in both rivers had improved decidedly after the opening of the plants, although an increased number of individual groups of microorganisms was found at the treated sewage outlet from one of the plants.

Implementation of Community Wetlands for the sanitation of the Cajititlan Lake, Jalisco

2021 ◽  
pp. 14-21
Author(s):  
Juan Luis Caro-Becerra ◽  
Luz Adriana Vizcaíno-Rodríguez ◽  
Ramiro Luján-Godínez ◽  
J. Guadalupe Michel-Parra
Keyword(s):  
Aquatic Vegetation ◽  
Lemna Minor ◽  
Sewage Treatment ◽  
Typha Latifolia ◽  
Basic Function ◽  
Floating Structures ◽  
Sewage Treatment Plants ◽  
Quality Of Water ◽  
Vegetation Species

Wetlands are systems that promote the sustainability and development of a society. The goal of this research was the implementation of a prototype aquatic garden to assess the quality of water in Cajititlán Lake, using sewage treatment plants with the purpose of removing nutrients, phosphates and nitrates among others parameters. This was made possible by floating structures containing aquatic vegetation species like.: Typha latifolia, Lemna minor, Canna indica, Iris pseudacorus, Equisetum arvense, etc. whose basic function is to retain nutrients through phytoremediation processes. The results indicate that the implementation of community wetlands made possible to reduce BOD levels from 220 mg/lt to 12 mg/lt across a surface of 120 m², treating a flow rate of approximately 5.30 gal/min to obtain an effluent in accordance with norm NMX-AA-012-SCFI. It is concluded that community wetlands are suitable ecological alternatives for the treatment of the wastewater discharged directly into the lake.

Enteric Bacteria Survival Factors

1992 ◽  
Vol 25 (12) ◽  
pp. 93-103 ◽  
Author(s):  
M. Pommepuy ◽  
J. F. Guillaud ◽  
E. Dupray ◽  
A. Derrien ◽  
F. Le Guyader ◽  
...  
Keyword(s):  
Water Quality ◽  
Light Intensity ◽  
Sewage Treatment ◽  
Enteric Bacteria ◽  
Bactericidal Effect ◽  
Mediterranean Coast ◽  
Shellfish Farming ◽  
Two Parameters ◽  
Very High

In order to improve bacterial water quality of shellfish farming areas, studies were conducted in the English Channel (Morlaix) and on the Mediterranean coast (Toulon). These two areas were chosen in order to compare behaviour of fecal bacteria in two different ecosystems. In the estuary of Morlaix sediments are polluted by way of settlement, but most of the bacteria are mixed with turbid waters and are able to survive a very long time (T90 are in a range of several hours to several days). By measuring the increase in salt tolerance of the strains grown in natural organic matter, it was demonstrated that Salmonella can tolerate coastal water salinities. Moreover, because light penetration is prevented by suspended matter, the solar bactericidal effect is very low. On the contrary, through lack of nutrients and very high sunlight intensity, die-off rates in Mediterranean waters are very high (at the surface T90 are less than 2 hours, and several hours in deep waters). A close relationship was found between the light intensity received by bacteria and the T90. Predicted T90 must be found using these two parameters(including turbidity and deep effect on light intensity). The authors suggest that precautions must be taken to carry out impact studies depending on water quality of the area, especially in turbid areas. The knowledge of these mechanisms is very important to evaluate waste water impact on the quality of shellfish farming areas, and to improve elimination of fccal bacteria in sewage treatment plants.

scholarly journals The structural and technical solution for precipitation moisture reducing

2019 ◽  
Vol 91 ◽  
pp. 04002
Author(s):  
Nazira Dzhumagulova ◽  
Vladimir Smetanin ◽  
Nguyen Dinh Dap
Keyword(s):  
New Technology ◽  
Sewage Treatment ◽  
High Capacity ◽  
Technical Solution ◽  
Solid Domestic Waste ◽  
Major Drawback ◽  
Sewage Treatment Plants ◽  
Urban Sewage ◽  
Treatment Facilities ◽  
The Will

One of the main problems in Russia is an acute shortage of free land for the disposal of solid domestic waste and sewage sludge. The treatment and removal of precipitation is a major problem in wastewater treatment. Urban sewage treatment plants were built on model projects in the 1970s, in which natural dehydration on silt areas was provided. Sludge dehydration on silt areas of sewage treatment plants of medium and high capacity is impossible due to the lack of free land areas. The major drawback of this method is the rejection of significant land areas, contamination of the geo-environment, the release of pollutants into the air, as well as the loss of land resources. In sludge processing and utilization, it is necessary to achieve minimum damage to the environment and to increase the possibility of using it on behalf of the national economy. The adoption of new technology and processing of sediments allowed to reduce the initial amount of precipitation by 4 times and to reduce the humidity from 97% to 83%, the amount of sludge formed at the treatment facilities will decrease by 6 times (from 300 m3/day to 50 m3/day) as a result of dehydration of the filter presses, the will be a reduction in the surface concentrations of pollutants in the atmosphere from 5,4 tons per year to 2,9 tons per year.

scholarly journals The Physico-Chemical Quality of Effluents of Selected Sewage Treatment Plants Draining into River Rwizi, Mbarara Municipality, Uganda

2019 ◽  
Vol 11 (01) ◽  
pp. 20-36 ◽  
Author(s):  
Jeninah Atwebembeire ◽  
Morgan Andama ◽  
Jane Yatuha ◽  
Julius Bunny Lejju ◽  
Grace Kagoro Rugunda ◽  
...  
Keyword(s):  
Sewage Treatment ◽  
Chemical Quality ◽  
Sewage Treatment Plants ◽  
Physico Chemical

scholarly journals Risk Assessment Analysis in a Municipal Wastewater Treatment Plant

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 18
Author(s):  
Magdalena Łój-Pilch ◽  
Anita Zakrzewska ◽  
Ewa Zielewicz
Keyword(s):  
Risk Assessment ◽  
Municipal Wastewater ◽  
Sewage Treatment ◽  
Treatment Plant ◽  
Treated Wastewater ◽  
Municipal Sewage ◽  
Proper Function ◽  
Municipal Wastewater Treatment ◽  
Sewage Treatment Plants

Risk management, an aspect of which is risk assessment, is a process supporting the proper function of municipal sewage treatment plants. Many factors affect the quality of treated wastewater. Risk assessment, its analysis, and hierarchization permit the elimination of events with the most destructive impacts on the purification process.

High rate treatment by aerobic upflow sludge blanket (AUSB) with external oxygenation

2004 ◽  
Vol 50 (8) ◽  
pp. 193-200 ◽  
Author(s):  
K.R. Sharma ◽  
J.C. Huang
Keyword(s):  
Biological Treatment ◽  
Biomass Concentration ◽  
Suspended Solid ◽  
High Rate ◽  
Flow Recirculation ◽  
Suspended Solid Concentration ◽  
Specific Oxygen Uptake Rate ◽  
Volumetric Loading ◽  
High Biomass Concentration ◽  
Very High

A 3-year study was conducted using an aerobic upflow sludge blanket (AUSB) reactor to achieve high-rate biological treatment through maintenance of a high biomass concentration (7–10 g VSS/L) together with a high oxygen flux. The AUSB reactor was not aerated directly; instead, oxygenation was provided in an external chamber with flow recirculation. The oxygenation was provided at four different ressurizations: 0, 15, 20 and 25 psig. The AUSB reactor was also pressurized to avoid the flotation of biomass. The flow recirculation rate was varied from 400% to 1,500% in order to ensure adequate oxygen supply. It was found that the AUSB system was able to handle a volumetric loading of as high as 10 kg COD/m3-day with a removal efficiency of 92%. Despite a high upflow velocity through AUSB, the effluent suspended solid concentration was mostly below 60 mg/L. The active fraction of biomass in the AUSB sludge was about 3 times higher than that of the regular activated sludge. This was indicated by a very high specific oxygen uptake rate (SOUR), up to 180-250 mg O2/g VSS-hr. The sludge yield in the entire system was only 0.09 to 0.13 g VSS/g COD removed. This was mainly caused by additional auto-oxidation of biosolids in the oxygenation chamber due to flow recirculation.

Biological Waste Water Rehabilitation of Sugar Factories by Algocoenosis Correction

2017 ◽  
Vol 21 (3) ◽  
pp. 16-20 ◽  
Author(s):  
V.V. Kul’nev ◽  
V.I. Stupin ◽  
A.A. Borzenkov
Keyword(s):  
Waste Water ◽  
Biological Treatment ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Domestic Sewage ◽  
Total Water ◽  
Sewage Treatment Plants ◽  
Total Water Consumption

The article deals with theoretical and practical aspects of biological waste water rehabilitation of sugar factories by algocoenosis correction. This technology allows you to transfer domestic sewage treatment plant of filtration mode fields in the biological treatment ponds mode, significantly reducing the area of sewage treatment plants, thus improving the quality of treated waste water, which will, in turn, use them repeatedly reducing total water consumption.

scholarly journals Ecological risk assessment of a subtropical river influenced by discharges of residues from water and sewage treatment plants

2017 ◽  
Vol 28 (2) ◽  
pp. 156-174 ◽  
Author(s):  
Angélica Megda Silva ◽  
Denis Abessa ◽  
Paulo Augusto Zaitune Pamplin ◽  
Maria Beatriz Bohrer-Morel
Keyword(s):  
Sewage Treatment ◽  
Integrated Approach ◽  
National Standards ◽  
Benthic Community Structure ◽  
Content Type ◽  
Sewage Treatment Plants ◽  
Quality Assessments ◽  
Practical Implications ◽  
Ecotoxicological Assays

Purpose The São Lourenço River (SLR) is used to supply potable waters for the cities of São Lourenço da Serra and Juquitiba, but receives the residues from the water treatment plants (WTPs) and sewage treatment plants (STPs), respectively. The purpose of this paper is to evaluate the impacts of the discharges of Juquitiba’s WTP and STP on the quality of the SLR, by using an integrated approach based on different lines of evidence. Design/methodology/approach Six sampling sites were established along the river and comprised areas situated upstream and downstream of the discharges. Five sampling surveys were performed between 2004 and 2006 for collecting water and sediment samples for ecotoxicological assays. In two of these campaigns, benthic community structure and geochemistry (metals, nutrients and sediment texture) were also assessed. Findings Concentrations of P, Fe and Al in waters exceeded the national standards, but sediments were not considered to be contaminated by metals or nutrients. Water and sediments tended to exhibit marginal toxicities, excluding the sediments from JQT007 and JQT008 that were frequently toxic. Combination of geochemistry, toxicity and ecological indices indicated that some sites are not degraded, but in some stations the benthic alteration may be due to non-measured contaminants, especially in JQT007 and JQT008. Practical implications As the use of waters from SLR for public supply has increased, these results show that action should be taken in order to reverse the environmental degradation of SRL. Originality/value This research combined sediment and water quality assessments in order to provide a more suitable and reliable diagnostic of the environmental quality of the SLR.

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