This work has evaluated the effects of a thermally dried or composted dewatered sewage sludge on glucosidase activity, total (TCH) and extractable (ECH) carbohydrate content, microbial biomass carbon (MBC) and basal respiration (BR) of soils from limestone quarries under laboratory conditions. Two doses (low, L and high, H) of the dewatered sludge (DS), or of the respective thermally dried (TD...

Bricks manufactured from dried sludge collected from an industrial wastewater treatment plant were investigated. Results of tests indicated that the sludge proportion and the firing temperature were the two key factors determining the brick quality. Increasing the sludge content results in a decrease of brick shrinkage, water absorption, and compressive strength. Results also showed that the br...

The effects of moisture content on the survival and regrowth of seeded and indigenous enteric bacteria in raw sludge were determined. Cultures of six strains of fecally associated bacteria grown in sterilized, liquid sludge (5% solids) were all quite stable at this moisture level for over 90 days at 21 degrees C. When the moisture content of the sludge containing these organisms was reduced by ...

Pulp & Paper Canada T 93 107:4 (2006) ❘ ❘ ❘ 47 ISPOSAL OF SLUDGES produced from biological wastewater treatment facilities is costly for the pulp and paper industry. A novel biodrying process has been developed that raises the dryness of pulp and paper mill sludge to a solids level where it can be economically combusted in existing boilers [1]. The process involves an aerated biopile, in which ...

In our work we focused on the investigation of two intensive drying methods, i.e. infrared (IR) and microwave (MW) drying, for dairy sludge. During the experiments the effects of IR and MW drying with different power intensities on drying characteristic and biodegradability were examined. Our results has revealed that MW drying was more advantageous for dairy sludge, because the drying time nee...

We quantitatively studied the advantages of improving the compaction of a powder waste by several techniques, including its pelletization. The goal is increasing the mass storage capacity in a given storage volume, and reducing the permeability of air and moisture, that may trigger exothermic spontaneous reactions in organic waste, particularly as powders. The study is based on dried sludges fr...

Following the Fukushima nuclear accident of March 11, 2011, soil and water were contaminated by radioactive cesium. Moreover, radioactive cesium was found in the ocean sludge in Tokyo Bay, carried by rivers flowing into the bay. The cesium adsorbed in the sludge cannot easily be removed. The objective of this study was to investigate the effect of the addition of bacteria to the micro-bubble ci...

The effect of ions presence such as: Na, K, Ca, Cl, SO4 and CO3, at various initial concentrations, on the kinetics of cadmium sorption by dried activated sludge was studied at 25°C and free initial pH solution in batch conditions. The presence of these ions in solution was found to inhibit slightly the uptake of cadmium by dried activated sludge at different degrees: sodium, potassium, calcium...