|Abstract:||The key for efficient usage of lignocellulosic biomass for biofuel and biochemical production is its pretreatment. By pretreatment hardly decomposing lignin structure is altered, and cellulose and hemicellulose become more accessible in the pretreated biomass.
The goal of the research was to explore the effect of different pretreatment methods on the values of analysed parameters. Various parameters have been tested, such as chemical oxygen demand (COD), the amounts of nitrogen, phosphorous and potassium (NPK), NH3, total organic carbon (TOC), conductivity, the pH value and the concentrations of CH4, O2, CO2 and H2S. Tests have been conducted on sewage sludge, riverbank grass (species Typha latifolia) and their combination. Analysed have been carried out by applying two pre-treatment techniques, thermal pretreatment and fermentation with the addition of rumen fluid. Cuvette tests have been used for measuring the values of most parameters (COD, NPK, NH3, and total organic C) before and after pretreatment, sensors have been used for measurements of conductivity and the pH value, and after pre-treatment gas analyser have been used for measuring concentrations of gases.
Research has shown that the chosen pretreatment methods have influence on the values of parameters in the biomass. Most of the parameters have changed during pretreatment. COD values mainly increased during pretreatment, especially in case of riverbank grass samples. After pre-treatment, the pH value decreased. Conductivity increased after pretreatment, while decreased when rumen fluid has been added. The concentration of CH4 also increased after pretreatment, especially with the addition of rumen fluid. NPK analysis showed, that the highest value of macroelements is obtained for the combination of grass and sewage sludge. Increase of the C/N ratio has been observed, when the grass or rumen fluid have been added to the samples.|