Performance of horizontal flow roughing filter using limestone media for the removal of turbidity, suspended solids, biochemical oxygen demand and coliform organisms from wastewater

2008 ◽  
Vol 2 (3) ◽  
pp. 203
Author(s):  
Mohd. Nordin Adlan ◽  
Hamidi Abdul Aziz ◽  
Han Thein Maung ◽  
Yung Tse Hung
Keyword(s):  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Horizontal Flow

Aeration and Water Hyacinths in Waste Stabilization Ponds

1987 ◽  
Vol 19 (12) ◽  
pp. 265-271
Author(s):  
P. R. Thomas ◽  
H. O. Phelps
Keyword(s):  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Substantial Improvement ◽  
Additional Treatment ◽  
Coliform Bacteria ◽  
Effluent Quality ◽  
Stabilization Ponds ◽  
Water Hyacinths

The investigation was based on two facultative stabilization ponds initially designed to operate in parallel, and now receive wastewater in excess of their capacities from a fast expanding housing estate in the Caribbean Island of Trinidad. Because of the deterioration of the effluent quality relative to acceptable standards, an attempt was made to upgrade the ponds using water hyacinths at the early stages. However, from the results, it was clear that the introduction of water hyacinths in the test pond did not lead to any substantial improvement in the effluent because of the high loading on the pond. Therefore the ponds were modified to operate in series with surface aerators installed in the first pond. Initially, the effluent quality was monitored in terms of total suspended solids, volatile suspended solids, biochemical oxygen demand, faecal coliform bacteria, pH and dissolved oxygen with aeration in the first pond and no aquatic plants in the second pond. Although there was a significant improvement in the effluent quality, the values remained above the standards. As a result, water hyacinths were introduced in the second pond and the effluent quality monitored together with aeration in the first pond. The effluent quality improved with total suspended solids and biochemical oxygen demand values both as low as 10 mg/l in certain months, but additional treatment was needed to reduce faecal conforms.

Reed beds: constructed wetlands for municipal wastewater treatment plant sludge dewatering

2001 ◽  
Vol 44 (11-12) ◽  
pp. 393-398 ◽  
Author(s):  
J.S. Begg ◽  
R.L. Lavigne ◽  
P.L.M. Veneman
Keyword(s):  
Wastewater Treatment ◽  
Total Phosphorus ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Sludge Dewatering ◽  
Sludge Treatment ◽  
Reed Beds ◽  
Reed Bed

Reed beds are an alternative technology wastewater treatment system that mimic the biogeochemical processes inherent in natural wetlands. The purpose of this project was to determine the effectiveness of a reed bed sludge treatment system (RBSTS) in southern New England after a six-year period of operation by examining the concentrations of selected metals in the reed bed sludge biomass and by determining the fate of solids and selected nutrients. Parameters assessed in both the reed bed influent and effluent: total suspended solids, biochemical oxygen demand, nitrate-nitrogen and total phosphorus. In addition, the following metals were studied in the reed bed influent, effluent and Phragmites plant tissue and the sludge core biomass: boron, cadmium, chromium, copper, iron, lead, manganese, molybdenum, nickel, and zinc. The removal efficiencies for sludge dewatering, total suspended solids and biochemical oxygen demand were all over 90%. Nitrate and total phosphorus removal rates were 90% and 80% respectively. Overall metals removal efficient was 87%. Copper was the only metal in the sludge biomass that exceeded the standards set by the Massachusetts Department of Environmental Protection for land disposal of sludge. The highest metal concentrations, for the most part, tended to be in the lower tier of the sludge profile. The exception was boron, which was more concentrated in the middle tier of the sludge profile. The data and results presented in this paper support the notion that reed bed sludge treatment systems and the use of reed beds provide an efficient and cost effective alternative for municipal sludge treatment.

scholarly journals Effluent Quality of Wet Process Coffee Processing Factories in Coffee Growing Ecological Zones in Burundi

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Bisekwa E ◽  
Njogu PM ◽  
Kufa-Obso T
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Processing Technology ◽  
Ecological Zones ◽  
Wet Process ◽  
Wastewater Samples ◽  
Field And Laboratory Conditions

Arabica coffee is cultivated by smallholders for commercial purposes, and it is commonly processed using wet Coffee Processing Technology. Burundi has more than 250 Coffee Processing factories which discharge their effluents to water bodies. The goal of this study was to determine the levels of physicochemical parameters in wastewater from Coffee Processing Technology factories in major coffee growing ecological zones in Burundi. Wastewater samples were collected from 19 sites representing private, public and cooperative owned coffee processing stations. Physicochemical analyses were determined in-situ field and laboratory conditions using standard procedures. Results indicate that the wastewater does not meet Burundi Effluent Discharge standards for Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand, pH. The data revealed that the wet coffee processing pollutes the environment in terms of pH, Total Suspended solids, Chemical Oxygen Demand, Biochemical Oxygen Demand. There is need to install quality polishing technologies to treat the water before disposal.

scholarly journals Improvement performance of secondary clarifiers by a computational fluid dynamics model

2011 ◽  
Vol 19 (4) ◽  
pp. 1-11 ◽  
Author(s):  
Ali Ghawi ◽  
J. Kriš
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Design Parameters ◽  
Dynamics Model ◽  
Computational Fluid Dynamics Model

Improvement performance of secondary clarifiers by a computational fluid dynamics model Secondary clarifier is one of the most commonly used unit operations in wastewater treatment plants. It is customarily designed to achieve the separation of solids from biologically treated effluents through the clarification of biological solids and the thickening of sludge. As treatment plants receive increasingly high wastewater flows, conventional sedimentation tanks suffer from overloading problems, which result in poor performance. Modification of inlet baffles through the use of an energy dissipating inlet (EDI) was proposed to enhance the performance in the circular clarifiers at the Al-Dewanyia wastewater treatment plant. A 3-dimensional fully mass conservative clarifier model, based on modern computational fluid dynamics theory, was applied to evaluate the proposed tank modification and to estimate the maximum capacity of the existing and modified clarifiers. A Computational Fluid Dynamics (CFD) model was formulated to describe the tank is performance, and design parameters were obtained based on the experimental results. The study revealed that velocity and (suspended solids) SS is a better parameter than TS (total solids), (Biochemical Oxygen Demand) BOD, (Chemical Oxygen Demand) COD to evaluate the performance of sedimentation tanks and that the removal efficiencies of the suspended solids, biochemical oxygen demand, and chemical oxygen demand were higher in the baffle.

scholarly journals Qualidade de Água do Rio Cuiabá no Perímetro Urbano da Capital Mato-Grossense

UNICIÊNCIAS ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 158-164
Author(s):  
Jorge Luiz de Arruda ◽  
Ana Carolina Amorim Marques ◽  
Osvaldo Borges Pinto Junior
Keyword(s):  
Water Quality ◽  
Biochemical Oxygen Demand ◽  
Rainy Season ◽  
Quality Index ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Quality Parameters ◽  
Dry Period ◽  
Total Coliforms ◽  
Effluent Quality

Este trabalho apresenta uma análise do índice e dos parâmetros de qualidade de água no perímetro urbano do rio Cuiabá - MT, considerando uma variação temporal (período úmido e seco) e espacial (montante - jusante) no ano de 2015. Os resultados mostraram que maiores valores de turbidez, sólidos totais, oxigênio dissolvido, demanda bioquímica de oxigênio e coliformes totais foram obtidos no período úmido e que os maiores valores de pH, nitrogênio/nitrato e fósforo/fosfato ocorreram no período seco. O Índice de Qualidade de Água (IQA) foi maior no período seco em função de menores valores sólidos em suspensão, turbidez e coliformes totais. A análise da água da região perimetral ao rio Cuiabá demonstrou diferenças significativas entre os pontos mais a montante (Sucuri) em relação aos pontos a jusante (Porto e Caís) em ambos os períodos. Nesse sentido, o IQA foi menor nos pontos mais a jusante (Porto, Caís e Comunidade São Gonçalo Beira Rio) que nos pontos mais a montante (Sucuri e Ribeirão do Lipa). Os parâmetros estudados atendem a normatização da Resolução Conama 357/2005, apesar das diferenças no IQA para os pontos amostrados entre os períodos sazonais.   Palavras-chave: Efluente. Índice de Qualidade. Valoração Ambiental.   Abstract This work presents an analysis of the index and water quality parameters in the urban perimeter of  Cuiabá - MT, considering a temporal (rainy and dry period) and spatial (downstream) variation in the year 2015. Higher turbidity values, total dissolved oxygen, biochemical oxygen demand and total coliforms were obtained in the rainy season, while higher values ​​of pH, nitrogen / nitrate and phosphorus / phosphate occurred in the dry period.  IQA was higher in the dry period due to lower suspended solids, turbidity and total coliforms. The water analysis from the perimeter region to the Cuiabá river showed significant differences between the points upstream (Sucuri) in relation to the downstream points (Porto and Caís) in both periods. In this sense, the IQA was smaller in the points downstream (Porto, Caís and Comunidade São Gonçalo Beira Rio) than in the most upstream points (Sucuri and Ribeirao do Lipa). The studied parameters comply with the normalization of Conama Resolution 357/2005, despite the differences in the IQA for the points sampled between the seasonal periods.   Keywords: Effluent. Quality Index. Environmental Valuation.

scholarly journals Physico-chemical investigation of wastewater from the Sebdou-Tlemcen textile complex North-West Algeria

2021 ◽  
Vol 6 (2) ◽  
pp. 361-370
Author(s):  
Asma Khelassi- Sefaoui ◽  
Abderrahmane Khechekhouche ◽  
Manel Zaoui-Djelloul Daouadji ◽  
Hamza Idrici
Keyword(s):  
Wastewater Treatment ◽  
Chemical Oxygen Demand ◽  
Water Temperature ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
North West ◽  
Physico Chemical ◽  
West Algeria

Wastewater treatment is a process used in several countries, particularly in Algeria. A study on Earth for one month was carried out at the sewage plant of the Sebdou textile complex, Tlemcen, north-west of Algeria. Regular samples gave average values at the outlet such that the water temperature is 22 ° C, the ph 7.43, the biochemical oxygen demand BOD5 is 36.5 mg / l, the chemical oxygen demand COD vary between 100 and 200 mg / l at the exit of the WWTP mg / l and finally suspended solids SS is of the order of 36.2 mg / l. All these values conform with the standards and therefore the treatment plant operates within Algerian standards.

Tannery wastewater pre-treatment

2009 ◽  
Vol 60 (2) ◽  
pp. 433-440 ◽  
Author(s):  
Mahmoud Abdel-Shafy Elsheikh
Keyword(s):  
Organic Matter ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Total Suspended Solids ◽  
Tannery Wastewater ◽  
Chemical System ◽  
Physico Chemical ◽  
Removal Efficiencies ◽  
Pre Treatment

Tannery wastewater is one of the most pollution sources. It can cause environmental problems related to its high organic matter, suspended solids and chromium. Chromium (III) salts are the most widely used chemicals for tanning processes, causing the tannery wastewater to be highly pollutant with chromium. The main objective of this study is to investigate the pre-treatment of an actual Egyptian tannery wastewater using two systems; the first electrolytic system and the second physico-chemical system. The performances of electrolytic system at current of 10, 20, 30 and 40 A were discussed. Poor removal efficiencies of chemical oxygen demand (COD), total suspended solids (TSS), chromium (III), ammonia (NH4+ and sulfide (S2−) were obtained. In the second physico-chemical system, calcium hydroxide was used as a coagulant material for chromium precipitation and plain sedimentation was applied for reducing of COD, biochemical oxygen demand (BOD5) and TSS. The results demonstrate 98.8% removal of chromium, 31% removal of COD, 25.8% removal of BOD5 and 51.2% removal of TSS.

scholarly journals Seasonally loaded waste stabilisation ponds: a novel application for intermittent discharge

2012 ◽  
Vol 66 (9) ◽  
pp. 1893-1899 ◽  
Author(s):  
C. P. Whalley ◽  
S. Heaven ◽  
C. J. Banks ◽  
A. M. Salter
Keyword(s):  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Quality Standards ◽  
System Capacity ◽  
Optimum Time ◽  
Design Factor ◽  
Waste Stabilisation Ponds ◽  
Removal Efficiencies ◽  
Influent Wastewater

This research examined the use of a single facultative pond for treatment of an intermittent discharge from a UK campsite. The system was monitored over an 11-month period to determine the optimum time for discharge in terms of quality standards. The results showed that based on organic strength, discharge was possible in winter between November and March but February was the optimum to meet nutrient and suspended solids requirements. The pond showed rapid acclimatisation to the influent wastewater, with biochemical oxygen demand removal rates during the filling period of around 60 kg ha−1 day−1 and removal efficiencies of ∼95% after maturation. The system proved simple to operate. A major design factor is the requirement for storage of net incoming precipitation, which may provide dilution of residual pollutants but requires additional system capacity.

Treatment of Slaughterhouse Wastewaters in Stabilization Ponds

1987 ◽  
Vol 19 (12) ◽  
pp. 85-91
Author(s):  
A. C. Duarte ◽  
L. M. Arroja ◽  
P. F. Diegues ◽  
I. Rosada ◽  
A. Hall ◽  
...  
Keyword(s):  
Chemical Oxygen Demand ◽  
Biochemical Oxygen Demand ◽  
Suspended Solids ◽  
Oxygen Demand ◽  
Bank Erosion ◽  
Organic Load ◽  
In Series ◽  
Sampling Programme ◽  
Effluent Discharge ◽  
The Impact

A sampling programme was devised to assess in terms of 5-day biochemical oxygen demand (BOD5), chemical oxygen demand (COD) and suspended solids (SS) removal the performance of one anaerobic, one facultative and two maturation ponds in series, for treating the wastewaters resulting from a slaughterhouse killing approximately 625 pigs/week. The results show that, in spite of poor maintenance,which has been causing bank erosion and macrophyte infestation, the system has coped with large variations in flow and organic load, reducing to a minimum the impact of the effluent discharge on the receiving creek.

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