Impacts of pH, temperature, and pretreatment method on biohydrogen production from organic wastes by sewage microflora

Abstract

This paper focuses on higher order modeling and design of the free-piston Stirling engine (FPSE) based on Ant Colony Optimization (ACO). First, the governing thermodynamics and dynamical equations of the engine have been derived. Then, the design parameters of the engine are selected taking into account the finite heat transfer coefficient (resulting in a fifth-order model) and pressure drop (resulting in a sixth-order model) in the dynamical system and the corresponding differential equations are derived in detail. In the following, the mentioned methods and their performance in modeling the FPSE dynamics are investigated. The simulated results show that the effect of the pressure drop on the places of the closed-loop poles of the system is not significant, while the heat transfer coefficient has a considerable effect on the engine dynamics. Accordingly, a fifth-order model along with ACO algorithm is proposed to justify the FPSE behavior. To validate the presented modeling scheme, the prototype engine SUTECH-SR-1 was experimented. It is found that the values of parameters obtained from the proposed design method are close to those of the experiment. Besides, the presented higher order model predicts the engine behavior with an acceptable accuracy through which the validity of the design technique is affirmed. Initial pressure of working gas (Pa) P w Power generation (J/s) P Nonlinear pressure (Pa) R Ideal gas constant J kgVolume of expansion space m

Effect of Combination of Liquid Hot Water System and Hydrogen Peroxide Pretreatment on Enzymatic Saccharification of Corn Cob

“…There are various pretreatment technologies for biomass materials, and these can be divided as physical (milling, thermal, etc) [7], chemical (acid, alkaline, oxidation, etc) [8], and biological methods [9]. Hydrogen peroxide pretreatment is one of the most promising chemicals for delignification of the biomass.…”

Enhancement of biohydrogen production from starch processing wastewater and further inside its ecosystem disclosed by 16S rDNA sequencing and FISH

“…Dark fermentation has advantages over photo fermentation since it allows smaller operational space and wider usage of substrates and microbial species, even mixed culture. Substrates for biological fermentation were reported using carbohydrate-rich waste/ wastewater such as food waste, starch waste/ wastewater [1] . There are many parameters affect hydrogen yield.…”

Impact of Culture pH Regulation on Biohydrogen Production using Suspended and Immobilized Microbial Cells

“…Hydrogen production through the dark fermentation technology is the most commonly used production process [8]. It refers to the process of converting organic materials to biohydrogen through a cascade of biochemical reactions by fermentative microorganisms in the absence of oxygen [1,8] and has the dual advantage of being a non-polluting biofuel as well as an effective method for waste water treatment [1].…”

“…It refers to the process of converting organic materials to biohydrogen through a cascade of biochemical reactions by fermentative microorganisms in the absence of oxygen [1,8] and has the dual advantage of being a non-polluting biofuel as well as an effective method for waste water treatment [1]. Although fermentative biohydrogen is a promising energy source, there is a need for in-depth knowledge of the impact of key physico-chemical parameters such as pH.…”