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Articles by M. Zamanzadeh
Total Records ( 4 ) for M. Zamanzadeh
  G.A. Omrani , M. Zamanzadeh , A. Maleki and Y. Ashori
  In the present study, Northern part of Iran was chosen as study area. Four hundred samples of earthworms were collected by three methods (hand-sorting, chemical and heat extraction) of which 352 and 20 were mature and immature earthworms, respectively from different parts of the area. Following the method introduced by Graff the earthworms were placed in formaldehyde (5 and 10%) and ethyl alcohol (60%). The morphological observations showed the presence of eight species including seven specimens of Lumbricidae: A. caliginosa, A. kaznakovi, A. jassyensis, A. rosea, D. veneta, D. byblica, E. fetida and a specimen of Megascolecidae: P. indica. The abundance of E. fetida was 18.1% with large distribution over the area that makes this species an easily available earthworm in rearing industry and in organic waste management.
  G. Omrani , A. Maleki , M. Zamanzadeh and M. Soltandalal
  The main objective of a solid waste management system is to effectively safeguard the public health, safety and welfare. This study demonstrates the present status of plastic waste management in Tehran and outlines the principle guidelines and policies regarding collection, handling and recycling of plastic waste and its microbial pollution in Tehran. Results showed that about 2,125,688 and 2,355,740 tons of Municipal Solid Waste (MSW) were generated per year in Tehran in 1999 and 2003, respectively. The plastic has grown than other category of MSW in Tehran from 8.01% by weight in 1999 to 9.61% in 2003. Approximately 50 tons per year of total plastic waste recycled and the others dispose in the Kahrizak landfill. The thermoplastic waste produced annually has begun to increase from 1.5% by weight in 1999 to 2.88% in 2003. According to the studies on plastics recycling in Tehran, there are a significant difference in terms of technological and scientific aspects of recycling between industrial countries and our country. Plastic recycling is carring out mechanically in Tehran. However, this simple method is not scientifically approved for collection, separation, recycling process and products generation. The results obtained by microbial tests form samples of recycled products showed the contamination of products such as Bacillus, Staphylococcus, Serratia and Entrobacter. Thus, the generated products have low quality because of lack of continual monitoring and technical program on plastic recycling and lack of public participation.
  K. Naddafi , M. Zamanzadeh , A. A. Azimi , G. A. Omrani , A. R. Mesdaghinia and E. Mobedi
  The effect of temperature, dry solids and C/N ratio on the growth of E. fetida and on vermicomposting of waste activated sludge was studied in a small-scale laboratory experiments. The maximum growth rate in 25°C, 15-20% dry solids and a C/N ratio of 15 were 19±1, 21±2 and 20±2 mg/worm/day, respectively. Moreover, changes in the physicochemical properties of the produced vermicasts were assessed. The highest VS reduction (18%) occurred in dry solids of 15% and in a C/N ratio of 25 the maximum VS reduction was 17%. TKN decreased with increase in dry solids by the end of vermicomposting process, while the highest organic to mineral P reduction occurred in the dry solids of 15%. The results for different levels of C/N ratio showed that TKN and organic to mineral P of the worm-worked waste activated sludge decreased with increase in C/N ratio. The pH of the produced vermicompost in different levels of dry solids and C/N ratio increased in all the experiments.
  K. Naddafi , M. Zamanzadeh , G. A. Omrani , A. R. Mesdaghinia , A. A. Azimi and E. Mobedi
  Sludge disposal has always represented a substantial portion of the costs associated with sewage treatment. In addition, the skilled personnel are not easily available to assure sound maintenance and operation of the conventional sludge treatment systems such as aerobic and anaerobic digestion; therefore, it is necessary to employ low cost and low technology practices in sludge management. Using earthworms in stabilization of sewage sludge, which has been approved by considerable work, can be a good alterative. This research was conducted to study the effect of stocking densities on sludge stabilization and sludge characteristics. In this regard, 40, 80 and 120 g earthworm wet weight were introduced into each of the plastic bins sizing 36 x 25 x 20 cm (length x width x height) to provide the desired stocking densities of 0.45, 0.90 and 1.35 kg worms m-2. Each bin received 2 kg waste activated sludge. The pilot-scale study showed that the highest VS (24.3%) reduction occurred in a stocking density of 1.35 kg Worm m-2 in which TKN and organic to mineral P ratio reduced 58.3 and 93.5 %, respectively.
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