Abstract-Soil contamination with petroleum hydrocarbons causes many problems for the surrounding environment. The current research aims at studying the performance of different in-situ remediation methods for the removal of total petroleum hydrocarbons (TPH) from sandy soil at different levels of contamination. The remediation methods that were tested include phytoremediation using alfalfa, bioremediation using Pseudomonase putida, and a combination. The soil was spiked with TPH at different levels (2.5%, 5.0% and 10.0%). after 90 days of experiments, the different treatments were able to reduce the level of contamination in the sandy soil with efficiencies up to a maximum of 99.9% for phytoremediation, 98.7% for bioremediation, and 99.0% for the combination method. The experimental results showed that the TPH remediation followed the first-order kinetics.

Experiments in the field environment have been conducted to study the growth of Panicum repens L., an aquatic plant, in the sewage sludge matrix. The experiments were also carried out to investigate the ability of this plant to dewater sewage sludge to increase the capacity of conventional drying beds. In addition, the ability of Panicum repens L. to reduce the sludge contents of certain elements (copper (Cu), Iron (Fe), Sodium (Na), lead (Pb), and Zinc (Zn)) was also investigated. All experiments were carried out in batch reactors. Different plant coverage densities were tested (0.00 to 27.3 kg/m). The liquid sewage sludge was collected from a wastewater treatment plant in Helwan city, Cairo Governorate, Egypt. The collected sludge represents a mixture of the primary sludge and waste activated sludge before discharging into drying beds.

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