Appropriate Methods in Determining the Event Mean Concentration and Pollutant Removal Efficiency of a Best Management Practice

Abstract

This study attempted to develop and suggest a more appropriate method for the determination of event mean concentration (EMC) and pollutant removal efficiency of a stormwater best management practice (BMP) considering rainfall. The stormwater runoff and hydrologic data gathered from 22 storm events during a 28-month monitoring period on a swirl and filtration type of BMP were used to evaluate the developed methods. Based on the findings, the modified EMC method resulted in lower (average) values than the overall EMC, although the differences were not significant (P>0.05). By comparison, the developed 'Rainfall Occurrence Ratio' (ROR) method was most significantly correlated (r=0.967 to 988, P<0.009) with the other existing removal efficiency determination methods such as the 'Efficiency Ratio' (ER), 'Summation of Loads' (SOL) and 'Regression of Loads' (ROL) methods. In addition, the ROR method gave the highest efficiency values, with no significant differences with any of the pollutant parameters, unlike the other three methods. These results were obtained because the ROR method integrated both pollutant loading and rainfall, which are not considered by the other three methods. Therefore, this study proved the suitability of the modified EMC and ROR methods for application in other BMP monitoring studies.

A Comparison Study of Runoff Characteristics of Non-Point Source Pollution from Three Watersheds in South Korea

“…In general, pollutants show high concentrations at the start of rainfall due to the first-flush effect [28]. It is difficult to apply existing first flush formulae to other watersheds since the first flush is complex and varies widely depending on the characteristics of the watershed [29,30]. The cumulative pollutant load ratio of the monitoring data was used to identify the first flush characteristics of each water quality index.…”

Monitoring urban storm water: facing climate changes in a Mediterranean coastal city

“…These variations are reported in several studies (Maniquiz et al [10], Lee et al [15], McCarthy et al [18], Bi et al [27], Maniquiz et al [28] and Ellis and Chatfield [29]). …”

“…The EMC is an important factor in predicting the total pollutant load, and therefore a critical parameter for estimating the contribution of runoff to the ecosystem (Maniquiz et al [10]). EMC was determined using eqn.…”

Effect of Eu 3+ concentration on the photocatalytic activity of LaSr 2 AlO 5 powders

“…There are several techniques for water treatment such as physical methods, biological treatment, chemical oxidation and photocatalytic process [6][7][8]. The last one is considered one of the most effective methods to degrade organic compounds [9,10]. It is considered a green method since it could employ solar light as the activation energy source.…”