Surfactants are among the most widely disseminated xenobiotics that contribute significantly to the pollution profile of sewage and wastewaters of all kinds. Among the currently employed chemical unit processes in the treatment of wastewaters, coagulation-flocculation has received considerable attention for yielding high pollutant removal efficiency. Jar-test experiments are employed in order to determine the optimum conditions for the removal of surfactants, COD and turbidity in terms of effective dosage, and pH control. Treatment with FeCl3 proved to be effective in a pH range between 7 and 9. The process is very effective in the reduction of surfactants and COD, the removals are 99 and 88 % respectively, and increased BOD5/COD index from 0.17 to 0.41. In addition to precipitation coagulation process, adsorptive micellar flocculation mechanism seems contribute to the removal of surfactants and organic matters from this rejection.
Clean Harbors is an industrial wastewater treatment facility in Guelph, Ontario. The facility utilizes highly refined, chemical precipitation processes, which remove heavy metals, suspended solids, and organics to generate safe effluent for discharge into municipal sewer systems. Wastewater is treated to meet municipal discharge requirements for biochemical oxygen demand (BOD5). Since BOD is a 5-day test, the results cannot be used to continuously monitor organic load. Chemical oxygen demand (COD) is used as a...
PeCOD® is a patented technology that can determine COD by measuring photocurrent charges originating from oxidation of the organic contaminants present in a water sample. Three PeCOD® analyzer units were implemented at three different facilities, representative of key food and beverage sub-sectors–a winery, a bakery and a brewery–to undertake “real-time” measurement and analysis of effluent wastewater. These real-time COD analyzers were tested at each facility for a duration of 4-6...
Abstract
The effectiveness of In-Pipe Technology (IPT) patented sewer collection system engineered bioaugmentation on i) influent wastewater loads to wastewater treatment plant (WWTP), ii) WWTP performance, and iii) effluent quality, was a demonstrated at a domestic sequencing batch reactor (SBR) WWTP (Sewer District #20) in Suffolk County, Long Island, New York in collaboration with the Suffolk County Department of Public Works (SCDPW) and the New York State Energy Research Development Authority (NYSERDA). The...
Survey of schools of different education levels (primary, intermediate and secondary) in Kuwait showed an average greywater generation rate of 7.3 L/p/d and varied in the range of 2.9 – 16 L/p/d, reflecting the school level of education (i.e. student age). The highest rates were observed for primary schools while the lowest rates were observed in secondary schools where students are more mature and use the water more wisely. The greywater characteristics indicated waste with low COD and BOD5 values but...
A new method based on a dimensionless analysis of the BOD first order model is used to determine the model coefficients (k and L). Curves for the theoretical first order model for the first five days of BOD divided by the theoretical BOD5 for different k values are drawn. The experimental BOD1 through BOD5 are made dimensionless by dividing them with the experimental BOD5. These values are connected smoothly using cubic spline method and MATLAB. The area below these cubic spline equations is compared to the area...
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