Characteristics of Organic Matters in Influents and Effluents of Sewage Treatment Plants in Gyeongsanbuk-do

Objectives : This study aimed to provide scientific information on the characteristics of organic matters in influents and effluents of sewage treatment plants (STPs) in Gyeongbuk province, Korea, for better performance of treatment processes in the plants.Methods : We selected six STPs with each capacity over 30,000 mZ3/day in Gyeongbuk province, and analyzed water quality data in influents and effluents of the plants from 2013 to 2020. Also, the removal efficiencies of pollutants were assessed with the operational data. In 2020, characteristics and origins of dissolved organic matters (DOM) in influents and effluents were investigated using the fluorescence excitation emission matrix (FEEM) analysis.Results and Discussion : The average BOD5/CODMn ratios of influents and effluents from the STPs were 1.60 and 0.27, respectively. High variability in BOD5/CODMn ratios was observed for both influents and effluents. The CODMn/TOC ratios of the influents and effluents were the same with an average of 1.6. Although the biological treatment process was different for each STP, the organic matter removal efficiency was similar, and the TOC removal efficiency was 86.5~91.7%. The representative spectra of DOM identified through FEEM analysis was peak C (humic-acid like substance) region, and under the same carbon concentration (2 mg-C/L) the fluorescence intensity of effluents was stronger than influents possibly due to the influence of soluble microbial products (SMP). It was found that DOM of both influent and effluent originated from microorganisms, and the difference in water quality of DOM was statistically significant.Conclusions : The characteristics and fate of organic matters in influents and effluents of the six STPs were similar regardless of plant location. The results of this study can be used as basic information to efficiently control organic matters in the STPs.

Download Full-text

Nutrient water quality of the Wye catchment, UK: exploring patterns and fluxes using the Environment Agency data archives

Hydrology and Earth System Sciences ◽

10.5194/hess-7-722-2003 ◽

2003 ◽

Vol 7 (5) ◽

pp. 722-743 ◽

Cited By ~ 36

Author(s):

H. P. Jarvie ◽

C. Neal ◽

P. J. A. Withers ◽

A. Robinson ◽

N. Salter

Keyword(s):

Water Quality ◽

Sewage Treatment ◽

Quality Data ◽

Agricultural Activity ◽

Spatial And Temporal Variability ◽

Water Quality Data ◽

Climatic Fluctuations ◽

Mass Load ◽

Environment Agency

Abstract. Water quality data, collected by the Environment Agency in England and Wales over 10 years (1991 – 2000) were used to examine the spatial distribution of nutrient pollution risk and for assessing broad-scale spatial and temporal variability in nutrient fluxes across the Wye catchment. Nutrient water quality across the upper and middle Wye catchment, and along the main River Wye, is generally very good. However, the main areas of concern lie in the small tributaries in the south and east of the catchment, which have lower dilution capacity and high agricultural and effluent inputs, and where mean Total Reactive Phosphorus (TRP) in some cases exceed 1 mg-P l-1. Indeed, mass load calculations have demonstrated that the lowland south and east portion of the catchment contributes more than 85% of the whole-catchment TRP and more than 78% of nitrate (NO3‾) loads. Ratios of NO3‾:Ca were used to fingerprint different water-types across the catchment, linked to weathering and agricultural activity. The Wye catchment has been subject to two major sets of perturbations during the study period: (i) climatic fluctuations, with a drought during 1995-6, followed by a subsequent drought-break in 1997/8, and extreme high river flows in the autumn/winter of 2000/2001, and (ii) introduction of tertiary P-treatment at major sewage treatment works in the catchment. The implications of these perturbations for the nutrient water quality of the Wye catchment are discussed. Recommendations are made for more targeted monitoring to directly assess diffuse source nutrient contributions. Keywords: nutrients, phosphate, phosphorus, nitrate, nitrogen, river, Wye, PSYCHIC, Defra

Download Full-text

Application of a Nonparametric Approach for Monitoring and Detecting Trends in Water Quality Data for the St

Water Quality Research Journal ◽

10.2166/wqrj.1986.012 ◽

1986 ◽

Vol 21 (2) ◽

pp. 153-167 ◽

Cited By ~ 13

Author(s):

Michael D. Cailas ◽

George Cavadias ◽

Ronald Gehr

Keyword(s):

Water Quality ◽

Parametric Method ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Quality Data ◽

Seasonal Adjustment ◽

Positive Trend ◽

Water Quality Data ◽

Nonparametric Approach

Abstract To overcome some of the restrictions due to the irregular structure of water quality data, a nonparametric approach has been developed based on Kendall’s T and a seasonal adjustment model, which enables one to test for the significance of trends as well as to monitor the trend variations with time. This methodology has been applied to water quality data for the St. Lawrence river obtained from Environment Canada and the municipality of Varennes. The results from the first source indicate that a positive trend is developing for conductivity and pH downstream from the Island of Montreal, whereas upstream from the Island pH is the only parameter indicating a positive trend. Data from the municipality of Varennes, due to their excellent quality, were used to verify the validity of the previous results as well as the reliability of the applied methodology. Analysis of the Varennes data with a parametric method indicated that a positive trend in pH is indeed evident. This finding will be of consequence for future studies to ascertain the effect on the river of the new Montreal Urban Community Sewage Treatment Plant.

Download Full-text

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

Oceanological and Hydrobiological Studies ◽

10.2478/v10009-007-0049-7 ◽

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.

Download Full-text