Iranian Journal of

Backgrounds and Objectives: The school is the most appropriate place for flourishes children, adolescents and juniors, and prepares safe and vigorous life. Thus, the aim of this research is to study  of the hygienic conditions in primary schools in region 1 of Sari city.
Materials and Methods: This article is a descriptive study. In which 45 non-for-profit and governmental schools were sampled using census method. The Fools of sampling was questionnaire filled in during interview with school principals and direct observation. Collected information was analyzed using "Excell" and spss soft wares.
Results: The results of this search showed that %93.4 of schools had dimention smaller than minimum standard. Only in %35.6 of schools, lavatory and drinking places were separate and the quality and quantity of lighting in %32 of. schools were classes proper.
Conclusion: The most important finding of this search was the ignorant of indicators in environmental healthas overlooking of standards, and the schools are merely established on quantity and urgent need despit of their quality.

Backgrounds and Objectives: One of environmental outcomes in industrial towns is developing environmental pollution such as production of industrial wastewaters. These industrial wastewaters should be appropriately treated before entering to receiving waters. However we can't solve environmental anxieties by establishing of wastewater treatment plants alone but permanent and regular assessment of these treatment plants performance is necessary for achieving environmental standards. Thus, this research has been done in order to investigation of activated sludge performance in wastewater treatment of Agghala industrial town in Golestan province.
Materials and Methods: This cross-sectional study implemented in sewage treatment plant laboratory of Agghala industrial town in Golestan within 12 months at 2007. Chemical Oxygen Demand (COD) parameter determined twice in week, But Biochemical Oxygen Demand (BOD) test accomplished weekly. pH measured by pH meter daily. Experiment of total suspended solids (TSS) and total dissolved solids (TDS) carried out every 10 days. All tests accomplished according to standard method for water and wastewater examination (2005). Then data analyzed using excel 2007.
Results: The average of BOD, COD and TSS in influent was 11196.17, 1854.58, 1232.25 mg/L respectively.Maximum influent organic loading rate was related to Shahrivar andMehr months. The total average of removal efficiency for BOD, COD and TSS was calculated 99.66, 98.2, and 97.6% respectively.
Conclusion:Quality of this treatment plant effluent was according to effluent disposal standards all over year. In sum, efficiency of this treatment plant (activated sludge system) was very good ininfluent pollutant removing. However occasionally effluent was not adapted with environmental standards but these deficiencies is solvable by accurate management and supervision on flow rate and influent organic loading rate easily.