An upflow anaerobic sludge bed (UASB) system with sludge immobilized on granular activated carbon was developed for fermentative hydrogen production continuously from herbal medicine wastewater at various organic loading rates (8–40 g chemical oxygen demand (COD) L−1 d−1). The maximum hydrogen production rate reached 10.0 (±0.17) mmol L−1 hr−1 at organic loading rate of 24 g COD L−1 d−1, which was 19.9% higher than that of suspended sludge system. The effluents of hydrogen fermentation were used for continuous methane production in the subsequent UASB system. At hydraulic retention time of 15 h, the maximum methane production rate of 5.49 (±0.03) mmol L−1 hr−1 was obtained. The total energy recovery rate by co-production of hydrogen and methane was evaluated to be 7.26 kJ L−1 hr−1.
Ceramic Membranes in Sludge Thickening Applications
The Aerobic Digestion group has recently been conducting pilot testing of silicon carbide ceramic membranes manufactured by the Danish company Cembrane A/S. This promising technology shows a great ability to filter water even in the challenging high solids environment of sludge thickening. The results of the pilot testing have led the aerobic digestion group to utilize Cembrane’s membranes as the basis of design for sludge thickening projects moving forward and have signed an exclusive distribution license...
Case study - Sludge digestion/thickening optimizes treatment
Overview: Big Park Domestic Wastewater Improvements District in Arizona had constructed a new 500,000 gallonsper day biological wastewater treatment system in 1997. As time passed, the aging plant was unable tokeep up with increasing demands. Challenge: In 2012, the District started working with Sunrise Engineering to find a solution that would work in theirexisting plant. Sunrise Engineering partnered with Aeration Industries International to upgrade theequalization basin, as well as the sludge digester/thicken...
Electrocoagulation Wastewater Treatment – An Application To Sustainably Reuse Textile Wastewater
The textile industry is a water consumption intensive industry. Water is utilized for cleaning the raw material, and for the different steps in the textile dyeing process. Due to the effects of water scarcity and stricter environmental regulations, the cost of fresh water utilization has increased worldwide. In addition, the textile industry is faced with pressure by government regulators to move toward sustainability, by reducing the consumption of water, while internal pressures to maintain or increase profit...
Sludge Blanket Theory: Digging deeper
With over 50 years of design and manufacturing experience, we are rightly proud of our British-built environmentally friendly SludgeWatch 715 Sludge Blanket Detector. Our user-friendly design is highly portable, simple to use and along with its low cost has worldwide appeal. Things have changed somewhat since our first Sludge Blanket Detector was made back in 1974. No more messy man-handling of tubes containing contaminated waste, the SludgeWatch 715 Blanket Detector is an important health and safety device....
Effect of high salinity on yeast activated sludge reactor operation
Yeast activated sludge was developed and operated at salinities of 0, 15, 30, 45, and 60 g/l NaCl. The kinetics of the various sludges degrading a wastewater with glycerol as the carbon source were determined. Inhibition due to salinity was analyzed and it was found that the limiting concentration of NaCl is 120 g/l. Salinity affects the maximum growth rate of the sludge. Reactors were exposed to shock salinity changes. Salt shocks affected maximum growth rate of the reactors but treatment was still effective....