Quality assessment of rooftop runoff and harvested rainwater from a building catchment

2011 ◽  
Vol 63 (11) ◽  
pp. 2725-2731 ◽  
Author(s):  
J. Y. Lee ◽  
H. J. Kim ◽  
M. Y. Han
Keyword(s):  
Metal Ion ◽  
Rainwater Harvesting ◽  
Heterotrophic Bacteria ◽  
Principal Component ◽  
Total Coliform ◽  
Quality Parameters ◽  
Rainfall Event ◽  
E Coli ◽  
Drinking Water Standard ◽  
Alternative Water

A major obstacle to the promotion of rainwater harvesting is chemical and microbiological concerns. To determine its suitability as an alternative water resource, water quality parameters such as pH, turbidity and metal ion concentrations and counted total coliform, Escherichia coli and heterotrophic bacteria were measured. It was observed that the stored rainwater had a neutral average pH and that its turbidity depended on the duration and intensity of the rainfall event. Metal concentrations were within the permissible limits specified in the Korea drinking water standard. In addition, counts of coliform, E. coli and heterotrophic bacteria were higher in the first flush 5 min after the start of the rainfall event. Principal component analysis and correlation analysis through 40 events in 2009 showed that the quality of stored rainwater depends on the conditions of the catchment and storage tank and the antecedent dry period.

scholarly journals Assessment of the microbiological quality of rain water: A case study of selected water scarce area in Bangladesh

2019 ◽  
Vol 8 (1) ◽  
pp. 24-26
Author(s):  
Minhaj Uddin Ahmed ◽  
Ahmad Kamruzzaman Majumder ◽  
Md Sahadat Hossain ◽  
Abdullah Al Nayeem
Keyword(s):  
Drinking Water ◽  
Fecal Coliform ◽  
Membrane Filtration ◽  
Rainwater Harvesting ◽  
Microbiological Quality ◽  
Total Coliform ◽  
Quality Parameters ◽  
Alternative Water ◽  
To Come ◽  
Water Scarce

Availability as well as access to drinking water is one of the considerable constraints for achieving sustainable goals in many countries while microbial contamination has exacerbated this issue more significantly. The increasing trend of population and industrialization for economic growth has adversely been affecting fresh water resources that eventually leading to scarcity of available drinking water. Hence, controlling water pollution along with focusing on alternative water sources are important for ensuring access to safe drinking water. This study aimed to determine the biological water quality parameters of rainfall water in the water-scarce areas of Bangladesh. About sixty rainwater samples collected from seven different districts were collected for microbial analysis in particular Total Coliform (TC) and Fecal Coliform (FC) by using membrane filtration and direct counting method. The result found that 70 % of samples were free from total coliform, whereas only 5 % samples showed above 100 colonies. On the other hand, 83% samples were free from fecal coliform, whereas only 2% samples were within the range of 11-100 colonies. This study has also revealed that most of the samples collected from Rangamati and Khulna district were free from total coliform and fecal coliform. This study may also encourage people living in these water scarce areas to come forward for rainwater harvesting system as a prospective tool for achieving sustainable goal in drinking sector of Bangladesh. Stamford Journal of Microbiology, Vol.8(1) 2018: 24-26

Corn starch-based treatment improves rainwater quality

2015 ◽  
Vol 15 (6) ◽  
pp. 1326-1333
Author(s):  
Liane Yuri Kondo Nakada ◽  
Rodrigo Braga Moruzzi
Keyword(s):  
Corn Starch ◽  
Rainwater Harvesting ◽  
Single Layer ◽  
Water Source ◽  
Total Coliform ◽  
Direct Filtration ◽  
Alternative Water ◽  
End Use ◽  
Apparent Colour ◽  
Rainwater Quality

Rainwater harvesting can provide an alternative water source, which may demand little treatment, depending on the end use. Some starches have been used in water treatment as coagulant/flocculant/filtration aid, and might be applied as primary coagulant. Here, we show direct filtration with hydraulic rapid mixing, using 2–6 mg L−1 cationic corn starch as primary coagulant, considerably improves roof-harvested rainwater quality, achieving removal efficiencies of up to 71.7% of apparent colour, 78% of turbidity, 1.1 log-unit of total coliform, and 1.6 log-unit of Escherichia coli, meeting guidelines for turbidity, even for potable purposes. Cationic corn starch has proved to be a suitable primary coagulant when filtration is performed in a single-layer sand filter (coefficient of uniformity: 1.8, effective particle size: 0.52 mm), at hydraulic loading rate of 450 m day−1. However, a disinfection unit is required to meet an absence of faecal coliform.

scholarly journals Assessment of water quality in the vicinity of Chini lake, Malaysia

2019 ◽  
Vol 48 (4) ◽  
pp. 1037-1046
Author(s):  
Youssif Hussin Abdusalam ◽  
IM Sujaul ◽  
Md Abdul Karim ◽  
MG Salah ◽  
M Idris Ali ◽  
...  
Keyword(s):  
Water Quality ◽  
Lake Water ◽  
Open Water ◽  
Total Coliform ◽  
Quality Parameters ◽  
Lake Water Quality ◽  
E Coli ◽  
Sanitation Systems ◽  
Domestic Effluent ◽  
Effects Of Land Use

Chini lake water is used as a source of water for domestic, industrial and agriculture. The study was carried out to assess the water quality of the lake and surrounding area. Ten sampling sites were selected representing the open water body in the lake. A total of 14 water quality parameters viz.. temperature, EC, TDS, DO, pH, turbidity. BOD, COD, TSS, PO4, SO4, NH4, NO3 and salinity were measured. The lowest WQI value 77 was recorded at site S4, respectively, which were found to be slightly polluted. Considering the NWQS, temperature 30.04°C, EC 31.42 μS/cm, TDS 19.03 mg/l, NO3 - 0.21 mg/l, SO4 - 0.84 mg/l, PO4 - 0.05 mg/l, TSS 12.03 mg/l and salinity 0.03 ppt are categorized under class I, while DO 6.15 mg/l, pH 6.73, turbidity 4.22 NTU, BOD 1.63 mg/l, COD 19.50 mg/l and NH4-N 0.20 mg/l the lake water quality are categorized under class II. Total coliform was 273, 412, 868, 267, 495, 406, 929, 953, 441 and 398 cfu/100 ml at all S1 - S10 sites, respectively. While E. coli was found 13, 7, 13, 5, 7, 5, 6, 106, 10 and 7 cfu/100 ml, respectively at all S1 - S10 sites. The highest number of both total coliform 953 cfu/100ml and E. coli 106 cfu/100ml were observed at site S8. The sources of coliforms and E. coli pollution were wastes from human and animals and domestic effluent, which might be due to lack of improper sanitation systems and effects of land use from surrounding agricultural area.

scholarly journals Storage-induced deterioration of domestic water quality

2019 ◽  
Vol 9 (2) ◽  
pp. 329-337 ◽  
Author(s):  
C. C. Nnaji ◽  
I. V. Nnaji ◽  
R. O. Ekwule
Keyword(s):  
Water Quality ◽  
Heterotrophic Bacteria ◽  
Total Coliform ◽  
Plate Count ◽  
Prolonged Storage ◽  
Storage Tanks ◽  
Domestic Water ◽  
Significant Deterioration ◽  
E Coli ◽  
Most Significant Change

Abstract Due to the failure of municipal supply systems in many Nigerian cities, residents often resort to long storage of water in large high-density polyethylene (HDPE) tanks in order to reduce water stress. This paper investigated deterioration of the quality of stored water for a period of 35 days. Samples from 20 purposively selected storage tanks in Enugu, Nigeria were collected for analysis. Heterotrophic bacteria, total coliform (TC), enterococci and Escherichia coli were present in 85%, 75%, 40% and 61% of the samples, respectively. E. coli (p < 0.001) and heterotrophic plate count (HPC) (p < 0.001) were significantly higher in storage tanks that were also used for rainwater collection than those that were not. HPC and TC counts in tanks that collect rainwater were twice those of tanks that do not, while E. coli and enterococci counts in tanks that also collect rainwater were three times those of tanks that do not collect rainwater. The most significant change (p < 0.001) in E. coli concentration occurred after 15 days of storage. Cleaning of tanks caused significant reduction of TC counts (p = 0.013), E. coli (p < 0.001), HPC (p < 0.001) and enterococci (p = 0.001). Hence, prolonged storage of water causes significant deterioration of water quality.

Assessment of Garcinia kola seed as a natural material for water treatment

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Staphylococcus Aureus ◽  
Heterotrophic Bacteria ◽  
Total Coliform ◽  
Microbial Reduction ◽  
Nitrate Content ◽  
Natural Material ◽  
Phytochemical Analysis ◽  
Garcinia Kola ◽  
E Coli ◽  
Faecal Streptococcus

The coagulation and antimicrobial efficiency of Garcinia kola at different concentrations on turbid surface water samples collected from Ogbor Hill River in Aba was studied. Phytochemical analysis showed alkaloid content of 2.11±0.04% while saponin, flavonoid and tannin contents were 0.34±0.04%, 2.16±0.03% and 0.14±0.02%, respectively. Phenol content was 1.65±0.01%. The physicochemical and microbial analysis indicated that the water sample had temperature of 30.5±0.10 ℃, pH of 7.4±0.20, total dissolved solids of 161.54±1.13 mg/L, turbidity of 31.64±0.08 NTU, electrical conductivity of 221.4±0.35 μS/cm, biochemical oxygen demand of 5.87±0.03 mg/L, chloride content of 0.28±0.02 mg/L, nitrate content of 248.6±0.27 mg/L, nitrite content of 1.86±0.04 mg/L, 12.00±1.00 MPN/ml of Total Coliform, (7.67±1.00) x 102 CFU/ml of E. coli, (10.33±1.15) x102 CFU/ml of faecal streptococcus, (15.67±2.52) x 102 CFU/ml of Staphylococcus aureus and too numerous to count (TNTC) for total heterotrophic bacteria. However, microbial reduction after treatment with Garcinia kola seed extract at different concentrations ranged from 41.67–75.00% for total coliform, 34.81–73.92% for E. coli, 12.87-70.96% for Faecal streptococcus, 36.18–68.09% for Staphylococcus aureus and 45.30–65.81% for total heterotrophic bacteria. Garcina kola seed is non-toxic and does not significantly affect the pH and conductivity of the treated water.

scholarly journals The effect of container-biofilm on the microbiological quality of water used from plastic household containers

2003 ◽  
Vol 1 (3) ◽  
pp. 101-108 ◽  
Author(s):  
P. Jagals ◽  
C. Jagals ◽  
T. C. Bokako
Keyword(s):  
Heterotrophic Bacteria ◽  
Microbiological Quality ◽  
Total Coliform ◽  
Human Consumption ◽  
Microbiological Contamination ◽  
Supply Source ◽  
E Coli ◽  
Quality Of Water ◽  
Storage Containers

Studies in Southern Africa have shown that even when microbiologically safe water is supplied to developing communities at communal standpipes, contamination by high numbers of pathogenic microorganisms may occur during the processes of fetching water from the supply source and storage during use at home, rendering such waters unsafe for human consumption. This study investigated the occurrence of biofilm in PVC storage containers as one possible reason for this deterioration, using heterotrophic bacteria and total coliform counts as well as turbidity as indicators. A second objective was to determine whether biofilm in water-storage containers could contribute to hazardous microbiological contamination indicated by Escherichia coli and Clostridium perfringens. Results indicated that increased microbiological contamination is associated with biofilm. The biofilm harbours heterotrophic bacteria, total coliforms and C. perfringens. E. coli could not be associated directly with the levels of biofilm in containers but rather appears to be introduced intermittently from the ambient domestic environment. When dislodged with the biofilm, these bacteria contributed substantially to the deterioration of the microbiological quality of supplied water stored in plastic containers.

Effectiveness of solar disinfection (SODIS) in rural coastal Bangladesh

2015 ◽  
Vol 13 (4) ◽  
pp. 1113-1122 ◽  
Author(s):  
Md. Atikul Islam ◽  
Abul Kalam Azad ◽  
Md. Ali Akber ◽  
Masudur Rahman ◽  
Indrojit Sadhu
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Coastal Area ◽  
Rainwater Harvesting ◽  
Low Cost ◽  
Treatment Technology ◽  
Solar Disinfection ◽  
E Coli ◽  
Alternative Water ◽  
Alternative Water Supply

Scarcity of drinking water in the coastal area of Bangladesh compels the inhabitants to be highly dependent on alternative water supply options like rainwater harvesting system (RWHS), pond sand filter (PSF), and rain-feed ponds. Susceptibility of these alternative water supply options to microbial contamination demands a low-cost water treatment technology. This study evaluates the effectiveness of solar disinfection (SODIS) to treat drinking water from available sources in the southwest coastal area of Bangladesh. A total of 50 households from Dacope upazila in Khulna district were selected to investigate the performance of SODIS. Data were collected in two rounds to examine fecal coliform (FC) and Escherichia coli (E. coli) contamination of drinking water at the household water storage containers and SODIS bottles, and thereby determined the effectiveness of SODIS in reducing fecal contamination. All water samples were analyzed for pH, electrical conductivity, turbidity and salinity. SODIS significantly reduced FC and E. coli contamination under household conditions. The median health risk reduction by SODIS was more than 96 and 90% for pond and RWHS, respectively. Besides, turbidity of the treated water was found to be less than 5 NTU, except pond water. Only 34% of the participating households routinely adopted SODIS during the study.

Quality and suitability of harvested rainwater for drinking in Bangladesh

2010 ◽  
Vol 10 (3) ◽  
pp. 359-366 ◽  
Author(s):  
Md. Rezaul Karim
Keyword(s):  
Drinking Water ◽  
Water Supply ◽  
Rainwater Harvesting ◽  
Quality Parameters ◽  
Drinking Water Supply ◽  
Supply Source ◽  
Drinking Water Standard ◽  
Guideline Values ◽  
Harvesting Systems ◽  
Who Guideline

Several programs have been undertaken during the last few years to install rooftop rainwater harvesting systems as an alternative drinking water supply source both in the coastal and arsenic affected areas in Bangladesh. In this study, quality of the harvested rainwater used for drinking water supply was assessed. A total of 308 harvested rainwater samples were collected from the different storage reservoirs located both in coastal and arsenic affected areas and analysed for various physical, chemical and microbial indicators. Most of the physical and chemical water quality parameters were well below the Bangladesh Drinking Water Standard and WHO guideline values. However, the harvested rainwater was found microbiologically contaminated to some extent and the water is not suitable for consumption without treatment. For safe and sustainable rainwater harvesting, WHO guideline and water safely plan (WSP) can be adopted in Bangladesh.

scholarly journals Physicochemical and Bacteriological Quality of Public Swimming Pools in the Tamale Metropolis, Ghana

J ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 236-249
Author(s):  
Umar Farouk Mustapha ◽  
Seth Mensah Abobi ◽  
Gerard Quarcoo
Keyword(s):  
Staphylococcus Aureus ◽  
Heterotrophic Bacteria ◽  
Total Coliform ◽  
Faecal Coliform ◽  
Health Concern ◽  
Swimming Pools ◽  
E Coli ◽  
Bacteriological Quality ◽  
Tamale Metropolis

The study focused on the physicochemical and bacteriological quality of public swimming pools in the Tamale Metropolis. Physicochemical properties such as pH, temperature, and conductivity, and bacteria counts—including total coliform, faecal coliform, Escherichia coli (E. coli), Staphylococcus aureus, and total heterotrophic bacteria—were analyzed for their conformity with required health standards. The results obtained were analyzed using Student t test and compared with World Health Organization (WHO) and Environmental Protection Agency (EPA) standards for safe recreational and drinking water. The highest and the lowest temperatures were recorded in April (32.53 °C) and February (28.16 °C), respectively. The lowest and the highest mean pH values were 4.04 and 6.13, which were below acceptable standards. The conductivity level varied from 469.1563 µS cm−1 to 928.1563 µS cm−1. While the pH did not conform to acceptable standards, temperature and conductivity were within the EPA and/or the WHO acceptable limits. The total coliform (TC) expressed in colony-forming units per 100 mL ranged from 0 to 397 (cfu/100 mL), faecal coliform (FC) 0 to196 cfu/100 mL, E. coli 0 to 52 cfu/100 mL, Staphylococcus aureus (S. aureus) 8 to 27 cfu/100 mL, and Total Heterotrophic Bacteria (THB) 44 to 197 (cfu/mL). TC, FC, E. coli, S. aureus, and THB counts in most of the samples complied with the bacteriological standards. However, the bacterial loads increased and exceeded the WHO and/or EPA standards as the number of bathers increased. Besides, there were positive correlations between physicochemical parameters such as temperature, pH, and bacterial loads. Most parameters studied met the acceptable standards of recreational water stipulated by the WHO and EPA. However, the presence of pathogenic organisms in the recreational waters at any point in time should be treated as a public health concern, and hence a call for routine monitoring and inspection of public swimming pools in the Tamale Metropolis.

Performance of biochar and filtralite as polishing step for on-site greywater treatment plant

2015 ◽  
Vol 26 (4) ◽  
pp. 607-625 ◽  
Author(s):  
Melesse Eshetu Moges ◽  
Fasil Ejigu Eregno ◽  
Arve Heistad
Keyword(s):  
Organic Matter ◽  
Treatment Plant ◽  
Filter Material ◽  
Total Coliform ◽  
Quality Parameters ◽  
Coliform Bacteria ◽  
Total N ◽  
Content Type ◽  
E Coli

Purpose – The purpose of this paper is to investigate the performance of biochar and fine filtralite as a polishing filter material in further removing organic matter, phosphorous, nitrogen, turbidity and indicator microorganisms from effluents of a compact greywater treatment plant (GWTP). Design/methodology/approach – A filtration experiment was carried out using columns filled with biochar and fine filtralite as filter material and unfilled column as a control. The effluent from the GWTP was pumped using a peristaltic pump at a rate of 280 l/m2-d and was fed in upward flow into the columns. The quality parameters of the raw greywater, effluents from the GWTP and the polishing columns were studied for six months of operation period. Findings – The results indicate that the process of polishing considerably improved the effluent quality of the system. Biochar performed best in removing organic matter, total N, turbidity and odor. Filtralite was superior in removing P. The contribution of the polishing step in removing total coliform bacteria (TCB) and Escherichia coli (E. coli) was remarkable. Additional log reduction of 2.18, 2.26 and 1.81 for TCB and 2.26, 2.70 and 2.01 for E. coli was obtained compared to the GWTP due to biochar, filtralite and control column, respectively. Practical implications – This study demonstrates the opportunities for improving the performance of decentralized greywater treatment systems by integrating locally available polishing materials to achieve a better quality effluent. Originality/value – The present study identifies efficient polishing system for decentralized and compacted greywater treatment system. The recommended polishing materials potentially improve the quality of effluents and add social, economic and environmental values.

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