The frequency of stable fly larvae in the process of producing compost from municipal waste

Various arthropods are active in composting process. One undesirable factor of this process is the growing population of flies among which the stable flies (Stomoxys calcitrans) are biting and blood sucking insects. The objective of this study was to investigate the frequency of producing this type of fly in the process of composting in laboratory. This research was a descriptive one in which waste was taken to laboratory. Then, the compostable components were integrated after separation and from the mentioned pile 9 basins were filled in 3 places with each basin containing 20 kilograms of waste. The fly larvae were sampled during the process of composting and samples underwent diagnosis after being taken to the laboratory. Thereafter, the results were compared through charts and tables. From among Diptera order, Muscidae family were the most frequent sample abundant larvae. As a whole, 2657 samples of stable fly larvae were detected and as the time of the process expanded, the number of samples gathered from basin was increased. The highest number of larvae was collected from underground basins. This study demonstrated that in composting process, a lot of arthropods are produced among which stable flies or Stomoxys calcitrans are considered as the most important species for being biting creatures that feed on human and animal blood. Therefore, the sites of producing compost must be established far away from human habitats. © 2018 Parlar Scientific Publications. All Rights Reserved

The study of quantity change and composition variations of municipal solid waste in Sareyn as a touristic city to improve municipal solid waste management

Background and Objectives. Investigating the amount and composition of municipal solid waste components, as an essential information, is required to design, operate and optimize the municipal solid waste management systems. The ultimate goal of this research is to explore the quantity change and physical variations of Sareyn municipal solid waste. Materials and Methods: This study was descriptive-cross sectional, conducted. Sampling was simple random and physical analysis was conducted according to the ASTM standard of MSW. Total of 28 samples were taken from the trucks brought to the landfill site. Results: The average amount of MSW production in Sareyn is 19.1 tons each day while the highest amount in summer is 35.1 and the lowest in winter is 10.46. The density of Sareyn MSW in the autumn is in the highest value and in the summer is in the lowest value equal to 386.1 and 349.1 kg / m3 respectively. The putrescible materials; 65.66 percent, have the highest amount, and the rest of the components consisting of plastics, rubbish and trash, paper and paperboard, wood, glass, textiles and metals, respectively. Conclusion: According to the conditions of Sareyn touristic city and in order to provide the required health care, it is necessary to review and plan a proper Municipal Solid Waste Management System, increase the number of collections of MSW during peak periods, locate a new place for landfill, and educate the citizens about the waste reduction and waste separation at the source. © 2019 Widener University School of Civil Engineering. All rights reserved

EFFICIENCY OF THE EARTHWORM Eisenia fetida UNDER THE EFFECT OF ORGANIC MATTER FOR BIOREMEDIATION OF SOILS CONTAMINATED WITH CADMIUM AND CHROMIUM

Abstract -The use of earthworms to bioremediate soil results in decreasing the pollutant concentration through a bioaccumulation mechanism of the contaminants in the earthworm's body. The present work is an empirical study that was carried out on soils contaminated with chromium and cadmium. Organic matter in the amount of 5% and 9% of soil weight was added. Chromium and cadmium concentrations in soil and in the body of worms were measured at two time periods of 21 and 42 days. According to the results, increasing from 5% to 9% the organic material of the soil contaminated with chromium at the initial concentration of 0.06 mg/g, the removal efficiency decreased by 5%. In 0.1 mg/g concentration the bioremediation efficiency decreased by 20%, showing that the earthworms probably have more tendency to consume the organic material and low tendency for consuming the soil contaminated by metal. Results showed that, considering the increased mortality of worms in the soil at a concentration of 0.08 mg/g of chromium, using this method is not recommended. For cadmium we require more study, though we can say that the organic material had no influence on the bioremediation of the soil