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Articles by Ahmad I. Al-Turki
Total Records ( 2 ) for Ahmad I. Al-Turki
  Ahmad I. Al-Turki
  A variety of stability and maturity indices were evaluated for 14 commercially produced composts in Saudi Arabia in order to acquire a comprehensive image of local compost quality and its compliance with local and international compost standards. Theses indices include chemical parameters such as Electrical Conductivity (EC), ammonium and nitrate concentrations, heavy metals and biological parameters such as Germination Index (GI), pathogen indicator and selected pathogens. Other important compost characteristics were also analyzed. Results revealed wide variations among samples in respect to all parameters examined. About 64% of tested compost exceeded the upper limit of EC set by most compost associations. The C/N ratio for compost samples ranged from 10.90 to 39.30 and 36% of samples were above the maximum value (1:25) set by various compost nations. Ten compost samples (71%) exceeded the maximum value set for nitrification index (NH4/NO3 ratio). Heavy metal contents in almost all compost samples were lower than the permissible levels set by local and international standards. GI test indicated that 64% of examined samples were below 80% and therefore could exhibit phytotoxicity. Microbiological analysis showed that 5, 4 and 10 compost samples were contaminated with faecal coliform, Salmonella and Staphylococci, respectively at levels above the suggested limit proposed by regulatory agency. Stability and maturity indices tested in this study have shown that most compost samples had a poor quality and should have no access to the market. The high variability of most important parameters of local composts suggests an urgent need for developing local compost quality standards in order to assure a good quality for land application, environment and public health.
  Ahmad I. Al-Turki
  The present study aimed to examine effluent quality of the Tertiary Wastewater Treatment Plant at Buraidah City (TWTPB) and to demonstrate its compliance with regulations of the Ministry of Water and Electricity (MWE) for tertiary treated effluent. Wastewater samples were monthly obtained form the influent and effluent in TWTPB and analyzed for Total Suspended Solid (TSS), Electrical conductivity, pH, turbidity, NH4+ concentration, some heavy metals, Na concentration, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and counts of fecal and total coliforms over a period of three consecutive years. The maximum values obtained of TSS, NH4+, BOD and COD in the effluent were 5.85, 0.90, 5.75, 24.4 mg L-1, respectively. Removal efficiency for TSS, BOD and COD exceeded 97% in the effluent indicating a high performance of TWTPB. Counts of fecal and total coliforms in the effluent were always less than 2 cfu 100 mL-1 in the effluent showing a high level of sanitation. Sodicity hazard indexes such as Sodium Adsorption Ratio (SAR) and Exchangeable Sodium Percentage (ESP), revealed that effluent salinity was of low to moderate potential problems when reused for irrigation. Residual Sodium Carbonate (RSC) exhibited a negative value implying that no residual carbonate or bicarbonate to react with Na to exacerbate the sodium hazard in soils was found. The effluent of TWTPB was found consistently to satisfy the stringent standards required by MWE for unrestricted irrigation in respect to all parameters measured in this study. It is, therefore, recommended to reuse TWTPB effluent for unrestricted irrigation, taking into consideration soil properties and leaching requirements.
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