مشخصات پژوهش

صفحه نخست /Continuous thickening of ...
عنوان
Continuous thickening of activated sludge by electro-flotation
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Activated sludge COD TSS Electro-flotation Thickening
چکیده
The present study was conducted for thickening of activated sludge by continuous electro-flotation (EF) process. The effects of some key factors such as initial pH, current density, operating time, electrode type (stainless steel and graphite) and operation conditions on the sludge thickening by determine of sludge volume reduction (SVR) and sludge solid concentration (SSC) and as well as removal of chemical oxygen demand (COD), total solids (TS), total suspended solids (TSS) and color were investigated. The results showed that the process has a good efficiency. The highest amount of SVR efficiency (89.3%) and SSC (38 g L1) were achieved at current density of 8 mA cm2 in 15 min for stainless steel. Moreover, as surface/ volume ratio increased, better thickening happened because increases both mass transfer and electro- generation of O2 and H2 at the surface of electrodes in low applied current density. Accordingly, consumed electrical energy was 0.15–1 kWh m3. Although suitable cell design is entirely essential, the use of chemicals and temperature increase are not effective. Consequently, EF is a comparatively appropriate process for thickening; in the water separated from the process, the amounts pertaining to COD, TS, TSS and color were respectively 112, 1601, 140 mg L1 and 5 TCU which are useable for subsequent different consumptions
پژوهشگران علیرضا رحمانی (نفر اول)