The Anaerobic Digestion Study On Aquatic Plants Mixtured With Swine Manure And Process Design

By using aquatic plant to management the problem of lake eutrophication have been extensively seriously, but how to use the massive growth of aquatic plants, has become the new problems. This study uses anaerobic digestion methods, and use the aquatic plants as the substrate to produce biogas. In order to improve the anaerobic digestion performance of the aquatic plants, we mixed pig manure to aquatic plants, and use two types reactors to carry on the anaerobic digestion experiment respectively.This paper firstly use the UASB reactor to digest swine manure mixtured with water hyacinth,and the COD concentrations is about 4000mg/L, during 30 days, the accumulative total gas production is 12371mL,and daily biogas production is 412.4mL , the methane content is 65.1% and the biogas yield is 345ml/g.Then,A comparative study of anaerobic digestion of swine manure mixtured with duckweed(1:1) and swine manure was carried out in a pilot scale plug-flow reactor,the SS concentrations of the substrate is 12.8g/L～15.9g/L,the results show that the mean removal efficiencies for COD and SS were 59.7% and 68.7%.and the pH is 6.7～7.9,solved with pig manure as the substrate anaerobic digestion problems that high pH. The biogas yield,the conversion rate and the volumetric biogas production of swine manure mixtured with duckweed(1:1) were 0.31 L/g,63.2% and 1.00 m~3/m~3/d,respectively.Through the above mixed digested experiments that proved that after the added of the swine manure to aquatic plants,the anaerobic digestion characteristics have promotion rised, and provide intentional reference to future use.