Production of Alkaline Protease Using Industrial Waste Effluent as Low-cost Fermentation Substrate

H. Zare; F. Meiguni; G. D. Najafpour

Volume 12, Issue 3 , September 2021, , Pages 264-272

  Alkaline proteases are the most important groups of commercial enzymes, which have been broadly used in industrial processes. In this study, Bacillus sp. PTCC 1538 was selected as a biological agent to produce alkaline protease. Enzyme production under submerge fermentation using industrial waste effluent ...  Read More

Optimization of Whey Treatment in Rotating Biological Contactor: Application of Taguchi Method

A. Ebrahimi; G. D. Najafpour; M. Anazadeh; M. Ghavami

Volume 9, Issue 2 , June 2018, , Pages 146-152

  Industrial waste management is the main concern of sustainable environment, and the proper control and operation of wastewater treatment plants for efficient removal of pollutants are certainly important. In this study, the L16 orthogonal array of the Taguchi method was applied to determine the optimum ...  Read More

Heterogeneous Catalyst HZSM5 in Biodiesel Production from Rapeseed Oil in Batch Process

M. Mohammadpour; G. D. Najafpour; M. Rahimnejad; M. Kiakojouri

Volume 8, Issue 2 , April 2017, , Pages 95-101

  In this paper, HZSM5 zeolite was synthesized through reflux method on support material CaO (25, 35 and 45 wt%) in two specific methods: microwave and impregnation at high temperature. The zeolite catalyst was modified with impregnation of NaOH (2, 4, 8, 12 wt%) at room temperature. The modified zeolite ...  Read More

Determination of Kinetic Parameters in Integrated Fixed Film Activated Sludge for Amol's Industrial Park Wastewater Treatment Plant

N. Azimi; G. D. Najafpour; M. Sadeghpoor

Volume 8, Issue 1 , January 2017, , Pages 31-35

  In this study the performance of integrated fixed film activated sludge system (IFAS)  in Amol industrial wastewater treatment plant (Amol, Iran) in treatment of food industrial wastewater was investigated. In addition, kinetic coefficients were evaluated for the system. The capacity of this system ...  Read More

Biological Treatment Processes: Suspended Growth vs. Attached Growth

A. Ebrahimi; G. D. Najafpour

Volume 7, Issue 2 , April 2016, , Pages 114-123

  Microorganisms play an important role in biological treatment processes. Biodegradable organic matter in wastewater would be removed completely by proper microbial consortia. The mixed culture is either generally present in the wastewater, or is introduced to the target wastewater by mixing it with domestic ...  Read More