A high rate clarifier for load levelling in sewerage systems

2003 ◽  
Vol 47 (12) ◽  
pp. 89-94
Author(s):  
R.A. Jago ◽  
A. Davey ◽  
H. Li
Keyword(s):  
Water Reuse ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Quality Parameters ◽  
High Rate ◽  
Chemical System ◽  
Operational Conditions ◽  
Plant Environment ◽  
Physico Chemical

The combining of chemically assisted clarification with a proprietary physical separation technology has led to a high rate process for clarifying flocculated sewage and other waste streams. This hybrid physico-chemical system, known as the CDS Fine Solids Separation (FSS) System, was developed over a two year period within a sewage treatment plant environment. This paper summarises the results of a recent field trial of the system with a Victorian water authority which experiences heavy loading of sewers in a coastal town during holiday periods. The trial sought to evaluate the FSS as a tool for smoothing the load on the 11 km long sewer to the sewage treatment plant (STP). The FSS system could possibly enable the costly augmentation of the sewer to be deferred, particularly as the capacity of the existing sewer pipe is satisfactory for most of the year. Water quality parameters were determined for a range of flowrates and operational conditions over a two month period. Large reductions were achieved in TSS, TP, FC, turbidity and BOD5, with only minimal reductions in NH3 and TON. These results showed that the FSS could meet the authority's objectives for load levelling and would provide a 20-25% increase in effective sewer capacity. The data are also discussed in terms of possible use of the effluent from the FSS for water reuse applications.

Suivi du fonctionnement d'une station d'epuration associant physico-chimie et biofiltration = Metabief (France)

1990 ◽  
Vol 22 (1-2) ◽  
pp. 251-259 ◽  
Author(s):  
R. Pujol
Keyword(s):  
Organic Matter ◽  
Biological Process ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Cold Temperatures ◽  
Biological Sludge ◽  
Physico Chemical ◽  
Total Plant ◽  
Sludge Characteristic

The sewage treatment plant of Metabief (East of France) has been monitored during three weeks in winter 1988. The treatment associates a physico-chemical treatment with a biological process of biofiltration. The first step eliminates about 60 % of the organic matter (COD and BOD). The biofliters improve the treatment removing 60 % of COD influent and 65 % of TSS. The process is efficient (N excepted) under conditions of the experiment but nitrification is limited by cold temperatures (< 10°C). Important results related to biological sludge product are presented (sludge characteristic, microscopic data, sludge production). Power consumption of biofliters represents 70 % of the total plant needs. Adequate control of washing cycles and close survey of numerous movable devices are of the utmost importance to guarantee the proper operating of biofliters.

Impact of cold and dilute sewage on pre-fermentation - a case study

2001 ◽  
Vol 43 (11) ◽  
pp. 109-117 ◽  
Author(s):  
D. Bixio ◽  
P. van Hauwermeiren ◽  
C. Thoeye ◽  
P. Ockier
Keyword(s):  
Phosphorus Removal ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
High Rate ◽  
Cold Weather ◽  
Biological Nutrient Removal ◽  
Municipal Sewage ◽  
Biological Phosphorus Removal ◽  
Primary Sludge

The municipal sewage treatment plant (STP) of the city of Ghent (Belgium) has to be retrofitted to a 43%-increase in the nitrogen treatment capacity and to phosphorus removal. Cold weather, dilute sewage and a critical COD over N ratio make the retrofit a challenge for full biological nutrient removal. The potential for fermentation of primary sludge to alter those critical feed sewage characteristics was experimentally evaluated. The idea was that the pinpoint introduction of fermentate could optimise the available reactors by achieving high-rate denitrification and enhanced biological phosphorus removal. The fermentation process was evaluated with a bench scale apparatus. At 20°C (heated process), the hydrolysis yield - expressed in terms of soluble COD - varied from 11% to 24% of the total sludge COD. The fermentation yield expressed in VFA COD varied from 8% to 13% of the total sludge COD. The efficiency of heated fermentation of primary sludge was lower during cold and wet weather, due to the different sewage characteristics, as a result of extended dilution periods and low temperature. The raw sewage, the primary effluent and the fermentate were fractionated according to the requirements for the IAWQ Activated Sludge Model No. 2d. The results clearly show that fermentation in the sewer played an important role and temperature was the driving parameter for the characteristics of the dissolved COD. Instead, the weather flow conditions were the driving parameter for the characteristics of the suspended COD. The results of the detailed fractionation were used as background for process evaluation. The final scenario choice for the retrofit depends on a cost-efficiency calculation.

Minimising Nuisances by Covering Compact Sewage Treatment Plants

1992 ◽  
Vol 25 (4-5) ◽  
pp. 363-374 ◽  
Author(s):  
F. Rogalla ◽  
G. Roudon ◽  
J. Sibony ◽  
F. Blondeau
Keyword(s):  
Large Scale ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Mediterranean Coast ◽  
High Rate ◽  
Parallel Plates ◽  
Multiple Use ◽  
Treatment Technology ◽  
Sewage Treatment Plants

Stringent effluent quality programs to limit wastewater discharges into receiving waters require extensive upgrading of conventional wastewater treatment plants. Large facilities built some decades ago are now often located in densely urbanised areas where land is unavailable. Since nitrogen and phophorus removal often require additional unit processes, innovative solutions have to be found to upgrade existing plants for nutrient removal. This paper shows large scale examples of compact technology and the additional upgrading flexibility provided. New facilities are implemented in sensitive neighborhoods by creative siting under sports stadiums, parks or buildings. In covered plants, air emission control becomes of primary importance. To reduce visual impacts and facilitate odour control, more and more underground treatment plants are constructed, allowing multiple use of plant surfaces. Several plants are illustrated in inner-city locations, avoiding infrastructure cost to pump sewage to remote sites. Most of the presented plants incorporate spacesaving settling facilities and high rate biological reactors to reduce the ‘footprints' of the installations and thus favour coverage. Parallel plates in primary setllers reduce the surface to about one tenth of conventional systems. Biocarbone aerated filters combine biodegradation with very high removal rates and retention of particles in one reactor, without additional clarification or filtration. Air treatment for large plant is mostly performed by chemical scrubbing, completely eliminating environmental nuisances. Performance results of both air and water treatment technology are given. Examples include recent sewage treatment plants on the French Mediterranean Coast. A physico-chemical treatment plant for 1 Million p.e. has operated since 1987 under a stadium in Marseille. In Monaco, the sewage treatment plant for 100 000 p.e.is located in the city center underneath a building of 3000 m2. Primary lamella settlers are followed by biological treatment on Biocarbone aerated filters and air is chemically deodourised. Similar technology is used in Antibes' 200 000 p.e. plant, integrated underneath a park close to the beach.

The Quality of Marine Water Around a Sewage Outfall

1999 ◽  
Vol 40 (7) ◽  
pp. 11-15 ◽  
Author(s):  
S. Al-Muzaini ◽  
M. Beg ◽  
K. Muslamani ◽  
M. Al-Mutairi
Keyword(s):  
Sewage Treatment ◽  
High Tide ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Coastal Region ◽  
Quality Parameters ◽  
Open Sea ◽  
Foul Smell ◽  
Sea Area ◽  
Physical And Chemical

A major sewage outlet located close to Shuwaikh Harbor discharges raw and treated water from the Al-Ardhiya sewage treatment plant, as well as raw sewage from a pumping station. It also receives input from Kuwait International Airport. The area has been spotted for its characteristic foul smell mainly because of stagnant water at the outlet. Therefore, samples were collected from eleven fixed stations at high tide and six stations at low tide to examine water quality parameters, NO3, NO2, NH3, SO4, S2, PO4, BOD, COD, TOC and heavy metals Pd, V, Cd, Ni, Mn, Cr, Cu, and total fecal coliform. The results of the physical and chemical analyses for both high-and low-tide samples along with microbiological analyses indicate that the Shuwaikh marine area is polluted. The pollution is high near the discharge point and decreases with distance. The data revealed a lower level of chemical pollutants and fecal counts at high tide than at low tide. This is mainly because of the dilution caused by incoming seawater at high tide. Although tidal movement helps reduce pollution in the area, for improvement of the situation to the desired level, biological wastewater treatment is suggested to remove most of the organic matter before discharge. Also, extension of the discharge outfall pipe to the open sea area would help reduce trapping of effluent in the coastal region and check fouling in the area.

Deterioration of Concrete Caused by Complex Attack in Sewage Treatment Plant Environment

2012 ◽  
Vol 26 (1) ◽  
pp. 124-134 ◽  
Author(s):  
Masoud Moradian ◽  
Mohammad Shekarchi ◽  
Farhad Pargar ◽  
Aboozar Bonakdar ◽  
Mahdi Valipour
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Plant Environment

scholarly journals Pollution or Protection - What Early Survey Data Shows on Rapid Waterbird Utilisation of a Newly Established Sewage Treatment Plant in Urban Ghana, West Africa?

2021 ◽  
Author(s):  
Lars Haubye Holbech ◽  
Cara Caroline Cobbinah
Keyword(s):  
West Africa ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Quality Parameters ◽  
Functional Networks ◽  
Sewage Treatment Plants ◽  
Waste Stabilisation Ponds ◽  
Natural Wetlands ◽  
Early Survey

Abstract Heavy urbanisation increasingly isolates and exerts pressure on natural wetlands, particularly in rapidly growing tropical developing countries, including West Africa. Constructed wetlands such as sewage treatment plants, may unintendedly offer wildlife protection due to prohibitive access control and limited use, thereby attracting wary and specialised waterbirds, otherwise heavily disturbed in formally protected wetlands with less polluted waterbodies. We present data from a rapid survey on 1-year post-opening colonisation and use of waterbirds in a recently constructed 11 ha restricted-access sewage treatment plant situated in Ghana’s capital, Accra. During November-December 2013 and January 2014, nine daily counts in each month produced an accumulated count of >4200 observations belonging to 26 species of waterbirds, including several important Afro-Palaearctic and intra-African migrants, hereunder ardeids, piscivorous divers, waterfowl and waders. The distributional patterns of waterbirds clearly reflected local foraging opportunities and water quality parameters in the system of 12 inter-connected waste stabilisation ponds. A nearby semi-natural wetland with cleaner waterbodies, but higher levels of human interference, supported half as many waterbirds, predominantly commensal gregarious species. Our data suggests that strict protection from disturbances outweighs possible negative implications attributed to mere pollution of waterbodies supporting various waterbird guilds, thus highlighting the potential importance of non-formally protected sewage treatment plants distributed in functional networks, as a complement to designated wetlands. We contemplate that establishing similar or larger plants jointly will improve sewage treatment and waterbird conservation in urban Ghana, and West Africa in general.

scholarly journals THE EFFECT OF RAMADI SEWAGE TREATMENT PLANT ON THE PHYTOPLANKTON AND SOME PHYSICO – CHEMICAL CHARACTERS IN EUPHRATES RIVER , IRAQ

2009 ◽  
Vol 6 (4) ◽  
pp. 673-682
Author(s):  
Baghdad Science Journal
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Total Cell ◽  
Total Alkalinity ◽  
Total Hardness ◽  
High Concentration ◽  
Euphrates River ◽  
Cell Counts ◽  
Physico Chemical

Four localities were selected in Euphrates River and Ramadi sewage treatment plant to collect water samples monthly during the period between October 2001 to July 2002 . Total cell count of phytoplankton and its physico- chemical concentrations were determined . The study aimed to demonstrate the effect of Ramadi sewage treatment plant on Euhprates River . It is concluded that the sewage had an dilution effect for the total hardness , total alkalinity , electrical conductivity and salinity of Euphrates River , but it is also caused in the presence of a contaminated area . This was cleared from the depletion of dissolved oxygen and high values of biological oxygen demand with lower valuse of pH in this area . The water of Euphrates River may classified as a hard water with high concentration of Ca and Mg. Bacillariophyceae(Diatoms) was dominated followed by chlorophyceae and cyanophyceae. The other classes were very spare and did not affect the total cell counts .

scholarly journals Study of Physico-chemical and Biological Characteristics of the Water of River Ganga at Patna, India

2018 ◽  
Vol 13 (3) ◽  
pp. 374-379 ◽  
Author(s):  
KUMARI SATYA ◽  
CHANDRAVIR NARAYAN
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Total Coliform ◽  
Coliform Bacteria ◽  
Quality Of Water ◽  
Physico Chemical ◽  
Indian Central ◽  
River Ganga ◽  
The City

River Ganga arises on the southern slopes of the Indian central Himalayan region beginning the Gangotri glacier. The river covers catchment area of 8, 61,404 km2 and its total length in the state Bihar stretch is 475 km. This study was carried out at Patna in the river Ganga at two sampling sites, viz., Digha Ghat (upstream) and Gai Ghat (downstream). The objective of the study was to observe the eminence of water of Ganga at Patna. The results that indicate that the river reaches near the city of Patna (upstream at Digha Ghat) are less polluted with pH 7.75, DO 7.42 mg/l, BOD 2.48 mg/l and COD 15.12 mg/l, while when the river leaves city after travelling 18 km (downstream at Gai Ghat), concentration of all pollutants increases significantly (pH 6.28, DO 6.22 mg/l, BOD 2 mg/l and COD 23 mg/l). The concentration of coliform bacteria (total coliform ranges from 5000 to 6000 MPN/100ml and faecal coliform ranges from 2200 MPN/100ml and 3000 MPN/100ml at both the sites) was recorded at higher level than the upper limit of the permissible level. This increment may be due to domestic and sewage discharge from the city. The municipality of Patna has sewage treatment plant capacity of about 109 MLD but whereas the city generates approximately 250 MLD sewage/township discharge. For the maintenance of pristine quality of water of the river Ganga, the sewage need be treated before discharge

scholarly journals Study on Efficiency of the Sewage Treatment Plant at College Campus (Karnataka) for Sustainable Artificial Recharge Designed model: A Case study

2021 ◽  
Vol 23 (1) ◽  
Author(s):  
Dhanraj M R ◽  
◽  
Ganesha A ◽  
Keyword(s):  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Residual Chlorine ◽  
Treated Effluent ◽  
Institute Of Technology

The aim of this study is to evaluate the quality of sewage generated from 7000 KLD Sewage Treatment Plant (STP) located at Manipal Institute of Technology, Manipal Karnataka which is based on the Activated Sludge Technology. The study of sewage quality of this plant is essential as most of the treated effluent discharged into a stream during monsoon and remaining season used for a Gardening purpose. Water samples were collected from the outlet and analyzed for the major waste-water quality parameters, such as pH, Biochemical Oxygen Demand (BOD) and residual chlorine. The overall quality of sewage of 7000 KLD Sewage treatment plants will be evaluated by collecting samples. The results of these evaluations also determine whether the effluent discharged into the water body is under limits given by Karnataka state pollution control board (KSPCB) & BIS standards.

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