太阳能作污泥厌氧消化加热热源试验研究

STUDY ON SOLAR HEAT COLLECTOR APPLICATION FOR SLUDGE HEATING tO ANAEROBIC DIGESTION

太阳能用作污泥厌氧消化加热的可靠性进行了小试和中试研究.小试结果表明污泥吸热效率高.是一种较好的吸热体.浅槽式集热器水温随太阳辐射强度增高而升高,随水深增加而降低,小试采用单(双)层玻璃浅槽式集热器.中型试验太阳能水箱水温温升,在气温低时12.4℃～20.5℃,气温高时16℃～24.8℃,太阳能集热器可作为污泥厌氧消化加热补充热源.

A bench scale and a pilot scale heat collector experiment were conduted to determine the absorption of solar radiation for sludge heating prior to anaerobic digestion.The heat absorbing efficiency of sludge and bench scale experiments using solar energy as hear source for anaerobic digestion were investigated. Results indicate that usable heat absorbed by water and water temperature in the solar heat collector increases with solar radiation intensity and decreases with depth in the collector. Sludge is a better heat absorbing medium in the solar heat collector compared to water and wastewater. Solar heat collector with double-layer glass cover. For pilot scale continuous solar energy collector, the increase in water tem perature was from 12.4 to 20.5℃) in a cool day, and 16.8 to 24.8℃ .in a warm day. The solar energy collector can serve as supplemental energy source for thermophilic digestion and as sole heating energy source for mesophilic digestion heating.