Background: Heavy metals pollution is a serious threat to environment and human health. Therefore, it is vital to find an effective method to remove heavy metals from natural resources.
Background: Lead is a toxic metal with a poor electrical conductivity. This metal can be hazardous and poisonous even in low concentrations. Objectives: The objective of this study is the evaluation of Prosopis Mimosaceae sawdust as a low-cost adsorbent for removal of the lead from effluents. Materials and Methods: The experiment was conducted in a batch system and the effect of pH, the amount of adsorbent, contact time, and the initial concentration of lead were examined. The most common isotherms and kinetics of adsorption were applied to analyze lead adsorption and the reaction rate, also the morphological characteristics of Prosopis Mimosaceae sawdust were determined before and after the separation process by using scanning electron microscope (SEM). Results: According to the results, the maximum efficiency of lead adsorption was 96.12%, which was obtained in pH of 7, contact time of 30 minutes, and 10 g/L of adsorbent. With the increase of the initial concentration of lead, the adsorbed metal at first increased, but later the removal percentage decreased. The data from this study indicated a good correspondence with both isotherms of Longmire and Freundlich. The kinetic analysis indicated that lead adsorption is consistent with the second-degree kinetic adsorption model (R 2 = 1). Conclusions: According to the high efficiency of lead removal by the sawdust of Prosopis Mimosaceae, this method can be applied as an efficient and low-cost method for the removal of lead.
A waste stabilization pond (WSP) is a hole in which household wastewater and other types of sewage are stored for long periods so that organic materials existing in them are deposited, decomposed and stabilized through exposure to light, heat, growth of algae and microorganisms. In this study, wastewater samples collected and treated by the treatment plant of a slaughterhouse in Ahvaz region of Iran and compared the relevant measured parameters with the standards, which set by the Environmental Protection Organization of Iran in order to determine the efficiency of WSPs in treating wastewater and making them usable for irrigation purposes. The results indicate that Turbidity, BOD5, PH, COD, TDS, and TSS values for the treated wastewater stood at >1000 NTU, 912 mg/l, 8.78, 1520 mg/l, 1052 mg/l, and 2180 mg/l respectively. A comparison of these values with the standard values set by the Environmental Protection Organization of Iran revealed a significant difference. This finding shows that the wastewater treatment plant under study had a poor productivity and performance. The wastewater treated by that facility should not be used for irrigation or discharge into surface water. Key Words: Environmental standards, Wastewater reuse, Waste stabilization pondİran'ın Ahvaz Bölgesinde Mezbahane Stabilizasyon Havuzu Arıtma Veriminin Araştırılması ÖZ: Atık stabilizasyon havuzu (ASH), evsel atık su ve diğer kanalizasyon türlerinin uzun süre bekletildiği, içinde bulunan organik materyallerin ışığa, ısınmaya, alg ve mikroorganizmaların büyümesine ortam hazırlayarak çökelmesine, parçalanmasına ve stabilize edilmesini sağlayan bir kuyudur. Bu çalışmada; İran'ın Ahvaz bölgesinde bulunan bir mezbahane toplanan ve arıtma tesisinde arıtılmış atık sulardan numune alınarak ASH ile atık suyun arıtımındaki verimin saptanması ve sulama amaçlı kullanılabilmesi için İran Çevre Koruma Örgütü tarafından belirlenen standartlarla ilgili ölçülen parametrelerin karşılaştırılması yapılmıştır. Çalışma sonucunda, arıtılmış atık suyun Türbiditesi, BOİ5, pH, KOİ, TÇKM ve TAKM değerleri sırasıyla > 1000 NTU, 912 mg/L, 8.78, 1520 mg/L, 1052 mg/L ve 2180 mg/L olarak elde edilmiştir. Bu değerlerin İran Çevre Koruma Örgütü tarafından belirlenen standart değerlerle karşılaştırılması sonucunda anlamlı bir farklılık gözlemlenmektedir. Bulgular sonucunda çalışmakta olan atık su arıtma tesisinin verimlilik ve performans açısından zayıf olduğu görülmektedir. Tesis tarafından arıtılan atık su, sulama için kullanılmamalı ve yüzeysel suya deşarj edilmemelidir.
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