Experimental Study On The Start-up And Operational Parameters For Internal Circulation Reactor Using Molasses As Fermentation Substrates

Due to the current global environment, energy depletion, environmental problems have become increasingly serious, people are paying more attention to the appearing of Greenhouse. In this circumstance, clean energy such as hydrogen, methane attracted extensive widespread concern around the world. However, the high cost of biological hydrogen production, the low produce of efficiency are the main reasons of it could not be widely used in the production and living wastewater treatment. How to improve Hydrogen production efficiency, reduce production costs and improve the substrate utilization and drainage after treatment and other issues it is also need a deep explore and study. In order to solve such problems, In the paper, the internal circulation reactor (IC) is a loop reactor, the Molasses wastewater organic fermentation substrate. By adding the activated carbon particles as immobilized carrier to strengthen of activated sludge, comparing the impact of the suspension growth system of biological hydrogen production process.In the suspension growth system, it was found that when HRT was 6 h, the temperature (35+1)℃, pH in the range of 6.8-7.2 and the influent COD concentration increase from 2 g · L-1 to 6g · L-1 , ethanol type fermentation was established efficiently and sustainably. The hydrogen production rate and the COD removal rate as the concentration increases in the conditions, and when the COD concentration at 6 g · L-1 , the overall maximal hydrogen production yield reached 13.8g · L-1 , and hydrogen production rate of 63% was obtained, the highest removal rate reached 46.79%. However, when the COD concentration at he range of 8～10 g · L-1 , the biomass content, hydrogen production yield and COD removal rate dropped significantly.In the immobilization system, when HRT was 6 h, the temperature (35±1) ℃, pH in the range of 6.8-7.2 and the influent COD concentration increase from 2 g · L-1 to 10g · L-1 1,activated sludge in the reactor was improved the shock ability for the strong adsorption forces and purification ability of activated carbon, ethanol type fermentation reactor was established. The overall maximal biogas and hydrogen production yield reach 25.4 g · L-1 and 17.38g · L-1 when the COD concentration at 6 g · L-1 ,and the highest COD removal rate reached 50.21%. The trace loss of activated sludge for the COD concentration at he range of 10 g · L-1 ,and the COD removal rate still reached 35%, this figure represents an increase of over 5% in the same period in the suspension growth system.