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Sultan Qaboos University (2018)

Evaluation of the use of treated sewage sludge as fertilizer and in the Bio-and Phyto-remediation of diesel-contaminated soil

Abdul Khaliq, Suaad Jaffar.

Titre : Evaluation of the use of treated sewage sludge as fertilizer and in the Bio-and Phyto-remediation of diesel-contaminated soil

Auteur : Abdul Khaliq, Suaad Jaffar.

Université de soutenance : Sultan Qaboos University

Grade : Doctor of Philosophy (PhD) in Soil and Water Management 2018

Résumé partiel
It is well-recognized that management of wastewater and sludge is a critical environmental issue in many countries. A regular and environmentally-safe wastewater treatment and associated sludge management requires the development of realistic and enforceable regulations as well as treatment systems appropriate to local circumstances. Furthermore, treated wastewater and sludge development should encourage the revision of existing standards, regulations, and policies for their management in the Sultanate. Many studies have been conducted on reusing treated wastewater as a beneficial source in Oman, but little research has been carried out on using sewage sludge. The objectives of this research are to compare the current Omani legislation with international legislations like World Health Organization (WHO) and United States Environmental Protection Agency (US-EPA) in terms of treated wastewater reuse for agricultural purposes and with European Guidelines (EU) and US-EPA in terms of sludge application reuse to recommend any necessary implementation of amendments and modifications to the national regulations. Moreover, the effect of composted sewage sludge (Kala compost) was investigated to reduce hydrocarbons from diesel contaminated soil by applying phytoremediation and bioremediation methods. Phytoremediation was used by means of Bermuda grass and Ryegrass and bioremediation was carried out using isolated microorganisms. Lastly, the effective application of Kala compost and inorganic (NPK) fertilizers on soil quality and on two crops (Radish and Beans) was studied. The study revealed that the national regulations are considered to be too general and a number of recommendations have been made to the decision-makers to consider modifying the guidelines in Oman. The remediation of diesel-contaminated soil showed that 77% removal of Total Petroleum Hydrocarbons (TPH) in the phytoremediation method was achieved when 10% of Kala compost was applied in contaminated soil cultivated with Bermuda grass compared to Ryegrass.

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