Flocculant in wastewater affects dynamics of inorganic N and accelerates removal of phenanthrene and anthracene in soil

Do Application Rates of Wastewater Sewage Sludge Affect the Removal of PAHs from Alkaline Saline Soil?

“…However, Betancur-Galvis et al [15] found that the removal of Phen in wastewater sludge amended soil with EC 12 dS m -1 , and pH 10 was 54% compared to only 25% in the unamended soil after seven days and 71% and 29%, respectively, after 112 days. In the experiment reported here the wastewater sludge had less effect on the removal of Phen and Anthra than as reported by Betancur-Galvis et al [15], but more than found by Fernández-Luqueño et al [6]. This would indicate that the application of the wastewater sludge from the same treatment plant did not always have the same effect on the removal of Anthra and Phen from soil.…”

“…Fernández-Luqueño et al [6] reported that in soil of Texcoco with EC 30 dS m -1 or 80 dS m -1 , removal of Anthra was not affected by the application of wastewater sludge. However, Betancur-Galvis et al [15] found that the removal of Phen in wastewater sludge amended soil with EC 12 dS m -1 , and pH 10 was 54% compared to only 25% in the unamended soil after seven days and 71% and 29%, respectively, after 112 days.…”

“…An HP-5 column from HewlettPackard (USA) with length of 15 m, inner diameter 0.53 mm, and film thickness 1.5 µm was used to separate the PAHs with He carrier gas flowing at a rate of 7 ml min -1 and maintained at 280ºC for 10 min. The temperature of the injector was 280ºC and that of the detector 300ºC [6].…”

Dissipation of Phenanthrene and Anthracene from Soil with Increasing Salt Content Amended with Wastewater Sludge

“…It is well known that autochthonous microorganisms can remove PAHs from soil [31] -even in the presence of salt [32]. In a previous experiment, 99% PHEN and 85% ANTHR were removed from an agricultural soil [23]. The removal of PHEN and ANTHR was much lower from soil with EC 30 dS m -1 (i.e., 11% and 5%, respectively), or with EC 60 dS m -1 (i.e., 15% and 12%, respectively).…”

“…Wastewater sludge contains large amounts of easily decomposable organic material that is rapidly mineralized when added to soil [9,23]. For instance, Zhang et al [24] reported that approximately 40% of the organic material in sludge mineralized within the first 50 days.…”