Papers by Keyword: Sewage Processing

Abstract: The biological hydrogen production by the sugar wastewater is an effective way to achieve the reclamation. In this paper, the effect of substrate concentration on the hydrogen production is discussed through employing the self-made continuous flow anaerobic fermentation hydrogen production reactor, taking the sludge in urban sewage treatment plant as the inoculated sludge and the simulated sugar wastewater as the substrate. The experimental results show that the best hydrogen production effect can be obtained when the temperature is (37±1) °C, HRT is 7h, the water alkalinity is around 530mg/L and the substrate concentration is 5000mg/L, namely the organic load is 60kgCOD/(m3·d). The volumes of gas production and hydrogen production both reach the maximum. The average values are respectively 36.2L/d and 21.8L/d. The obtained hydrogen production rate is 0.93kgCOD/(m3·d). During the whole process, the proportion of volatile acid composition remains stable, which is the butyric acid-type fermentation. When the concentration of COD is increased to 6000-8000mg/L, the ability of hydrogen production of system will be significantly dropped due to the increase of pH of system. The hydrogen production performance can be restored through artificially and timely lowering the water alkalinity. However, the hydrogen production rate will be decreased compared to the previous situation.

Abstract: Phosphorus was one of the causative materials of eutrophication that was widely generated in the water system, for instance, the rivers, lakes, and marshes all over the world. The removal method using the phosphorus adsorption ability of volcanic ash fall deposits contained especially the amorphous alumino-silicate mineral was examined. To improve the practicality of durability and the adsorption ability of the volcanic ash fall deposits was heated within the range from 100 to 1100degrees. It was found that the phosphorus adsorption ability of the material was increased as the calcinating temperature was raised, and reached the maximum value at about 600degrees. The amount of adsorption of phosphorus had decreased rapidly when the material was heating to 600degrees or more.