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Polycyclic aromatic hydrocarbons (PAHs) occur in the surface water of the Taizi River, China. The levels and composition patterns were studied by high-performance liquid chromatography and PAHs sources were analyzed using the isomer ratios of selected PAH compounds. In the flood period, concentrations of PAHs ranged from 1562.52 to 4176.15 ng/L with a mean of 2562.56 ng/L. In the dry period, concentrations ranged from 498.09 to 3218.27 ng/L with a mean of 1389.30 ng/L. The levels of ΣPAHs in the study area were higher than in other locations. The dominant PAHs were Baa in the flood period and Phe, Flu and Pyr in the dry period. The composition of PAHs was dominated by four-ring PAHs (51.72–82.69%) in the flood period and three-ring (28.25–50.10%) and four-ring PAHs (38.28–56.28%) in the dry period. The isomer ratios of Ant/(Ant + Phe), Flu/(Flu + Pyr) and compositional analysis were selected to identify the sources of PAHs. Coal combustion and traffic emission were the sources of PAHs in the surface water of the Taizi River, and the major source of PAHs was from combustion of coal. [ABSTRACT FROM AUTHOR]

The use of blood meal was studied for in-site bioremediation of contaminated farmland soil. The combination of blood meal and indigenous microorganisms helped to in-site remediate the combined contaminated aging farmland soil of DDTs and PAH in Shenyang, China. The concentration of DDTs and PAHs was 47.94 ± 0.63 μg/kg and 690.10 ± 5.16 μg/kg, respectively. Biostimulation using blood meal or glucose promoted the bioremediation rate of DDTs and PAHs. Compared to glucose, blood meal was a longer term repair additive of DDTs and PAHs, and the remediation result was more efficient and durable. In the blood meal treatment, plowing the soil once every 7 days could increase the soil enzyme activities and bacterial populations, and it could significantly promote the remediation rates of DDTs (P< 0.05) and more evidently promote the remediation rates of PAHs. The DDTs and PAHs remediation rates increased from 32.18% and 20.17% to 43.41% and 26.09%, respectively, in soil treated with blood meal and plowed weekly after the five month remediation. This study provides an highly efficient in-site farmland soil bioremediation technology that could have practical utility. [ABSTRACT FROM AUTHOR]