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Survey of air pollutants emitted from rendering plant of poultry slaughterhouse and design of local ventilation system and suitable collector for control and treatment of air pollutants
Gh Hesam, F Ghorbani Shahna, A Bahrami,
Volume 7, Issue 4 (1-2015)
Abstract

Background and Objectives: Emission of volatile organic compounds and unpleasant smell are the important characteristics of the rendering plant, causing disturbance for the workers and nearby residents. In order to prevent the spread of air pollutants and to provide favorable environment, application of treatment technologies is essential. Materials and Methods: In this study, in order to select suitable collector and ventilation system for rendering plant, air sampling was performed via NIOSH sampling methods (1501, 1300, 1600, and 2002). Totally, 24 air samples were collected from the ambient air, air pollution source, and worker’s breathing zone using two sorbent, activated charcoal and silica gel and were analyzed using GC-MS. Then, the local ventilation system was designed based on the qualification and quantitation analysis of air samples. The stairmand high efficiency cyclone and thermal oxidizer were designed for dust control and gas cleaning respectively. Results: In total, 41 chemical pollutants in exhaust air from rendering plant were identified these compounds included hydrocarbons, aldehydes, ketones, alcohols, ethers, halogenated compounds, sulfur compounds, nitrogen compounds, and acids. The results of ventilation system designing showed that the system with airflow of 5725 m3/h and a cyclone with the diameter of 1 m and the height of 4 m could remove 50% of particles with 9.45-micron diameter. Gaseous pollutants were removed using thermal oxidation via the consumption of 96 m3/h fuel gas flow. The chamber volume was 6.67 m3. The daily fuel costs were estimated 310000 RLS. Conclusion: Application of local exhaust ventilation system and integrated collectors for control of air pollutants in rendering plant can remove large amounts of particulate and gaseous pollutants. Control of these pollutants can cause loss of smell nuisance and environmental pollution and improving the health and welfare of workers and neighboring residents of such industries.


Optimization of catalytic sono-praxone hybrid process in the presence of iron oxide-zinc oxide catalyst for the treatment of petroleum wastewater by central composite design
Mehrab Aghazadeh, Amirhesam Hasani, Mehdi Borghei,
Volume 15, Issue 3 (12-2022)
Abstract
Background and Objective: Based on its unique characteristics, oil industry wastewater must be treated before discharging into the environment. The study aimed to optimize the catalytic sonopraxone process in the treatment of petroleum wastewater using a statistical method.
Materials and Methods: The synthesis of Iron Oxide-Zinc Oxide was carried out by air oxidation and layer-by-layer self-assembly method. XRD, SEM, EDAX, FT-IR, BET, DRS, VSM and TGA techniques were used to investigate the structure. In this study, applied CCD method optimization of pH parameters, reaction time, ozone gas concentration, hydrogen peroxide concentration and catalyst amount in the process. In optimal conditions, BOD5 and TPH removal values, reaction kinetics and synergistic effect of mechanisms were studied. COD, TPH and BOD5 were measured by spectrophotometer (DR6000), GC-FID and incubator, respectively.
Results: The results indicated that the Fe3O4@ZnO structure is well formed. A quadratic model was proposed to model the process based on the correlation coefficient. Based on ANOVA analysis and p and f indices, the proposed model was reported to be significant. Optimum conditions include pH 6.4, ozone concentration 1.3 mg/L.min, hydrogen peroxide concentration 2.5 mL/L, reaction time 51 min and catalyst amount equal to 0.64 g/L. In these conditions, the amount of COD reduction was 82.3 and 70% theoretically and experimentally, respectively. Also, in optimal conditions, BOD5 and TPH removal rates were 90.5% and 85.8%, respectively. The kinetics of the process follows the kinetics of the first order (R2=0.98) and the presence of different mechanisms together causes a synergistic effect and increases the efficiency of the process.
Conclusion: This process can improve the quality of oil effluent based on COD, BOD5, and TPH removal.
 

Study of physicochemical and microbial indicators of swimming pool water in Kashan, Aran and Bidgol
Nahid Raeisi, Samaneh Mehraban Nawaz, Ahmad Reza Yari, Mohammad Jahandideh, Fariba Naghavi, Reza Zeraatkar, Hadi Niknejad, Mohsen Hesami Arani,
Volume 18, Issue 4 (3-2026)
Abstract
Background and Objective: Swimming pools are considered as a potential source of microbial and chemical contamination due to direct and continuous contact with different groups of people. The present study was conducted to investigate the water health indicators of swimming pools in Kashan and Aran-Bidgol and compare them with the existing standards in the country in the years 2017-2021.
Materials and Methods: In this descriptive-analytical study with a longitudinal design, 830 samples were taken from all indoor and active pools in 2017-2021. Physicochemical parameters, and microbial parameters were measured. Finally, the data were analyzed using SPSS software 16.
Results: The concentration of free residual chlorine, combined chlorine, pH, turbidity, and corrosivity were in the desired range in 53 percent, 48 percent, 67 percent, 81 percent, and 67 percent of the water samples, respectively. None of the samples were contaminated with Pseudomonas. A significant and inverse relationship was observed between the bacterial population and free residual chlorine, and a significant and direct relationship was observed between the bacterial population and turbidity (p<0.005).
Conclusion: Due to the low compliance of the water chlorine level with the standard and the observation of coliform bacteria, Staphylococcus aureus, and heterotrophs, it is necessary to continuously monitor the physicochemical and microbial parameters of the water, as well as to carry out proper health surveillance and disinfection.
 

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