Journal of School of Public Health and

Background and Aim: By definition, the ratio of output to input in any firm is called efficiency. In general, there are two main approaches for measuring efficiency ─ parametric and non-parametric. The objective of this study was to assess the efficiency of Health Services Workshops in Iran in 2006.

Methods and Materials: The efficiency of Health Services Workshops in Iran in 2006 was assessed using the non-parametric method, based on linear programming. More specifically, the Data Envelopment Analysis (D.E.A) was used. The most important feature of the Data Envelopment Analysis (D.E.A) is its applicability for the firms that operate under a multiple input-and-output framework. Assessment of efficiency was based on 2 assumptions, namely, fixed and variable efficiency.

Results: The data show that, based on fixed efficiency, the efficiency in the Bushehr, Fars, Kerman, Mazandaran and Yazd provinces is the highest, the average being 80%, which means that the idle capacity is 20% . Based on the variable efficiency. assumption, in Ilam, Chahar Mahal-and-Bakhtiari, Semnan, and Kohgiluyeh Boyerahmad provinces the efficiency is 85% (idle capacity = 20%).

Conclusion: On the whole, the Chaharmahal-Bakhtiyari province is the most efficient in holding Health Services Workshops in Iran. Therefore, other provinces should follow this province as an example when planning to increase their efficiency.

Background and Aim: Problems related to conventional Fenton oxidation, including neccesity of having a low pH and production of considerable amounts of sludge, have prompted researchers to consider chelating agents to improve the pH operating range and iron nano-oxide particles to reduce excess sludge. The main objective of this study was to remove pyrene from contaminated soils by a modified Fenton oxidation method  at neutral pH.

Materials and Methods: Experiments were conducted using various concentrations of H2O2 (0-500 mM), iron nano-oxides (0-60 mM), reaction times (0.5-24 hours) and several chelating agents, namely, sodium pyrophosphate, ethylene diamine tetra-acetic acid, sodium citrate, fulvic and humic acids, to eliminate pyrene from soil (concentrations of 100-500 mg/kg).

Results: The efficiency of removal of pyrene at an initial concentration of 100 mg/kg was 99 % at the following reaction conditions: H2O2 and iron nano-oxide concentrations of 300 mM and 30 mM, respectively pH=3 and a reaction time of 6 hours. The initial pyrene concentration of 100 mg/kg decreased to 7 mg/kg at optimum conditions using sodium pyrophosphate as the chelating agent at pH 7.    

Conclusion: The modified Fenton oxidation method, using iron nano-oxide at optimum conditions as defined in this research, is an efficient alternative for chemical remediation or pre-treatment of soils contaminated wih pyrene at neutral pH.