In view of stricter regulations, new technologies should be developed to reduce the production and disposal of waste sludge. ![]() Currently, conventional sludge reduction methods, including mechanical, physical, chemical, electrical and biological methods, are in use however, these methods are energy and cost intensive. The estimated cost of treatment and disposal of waste sludge in WWTPs represents half, or even as much as 60% of the total cost of wastewater treatment. The results of this study revealed the process conditions which influenced the growth, and reproduction of Tubificidae and sludge reduction at a microscopic level, which could be a theoretical basis for the cultivation and application of Tubificidae in wastewater treatment plants.Īerobic wastewater treatment plants (WWTPs) produce large quantities of sludge containing various pollutants like heavy metals, pathogens and micropollutants. The respiration rate of Tubificidae was very high for DO range of ∼3.5–4.5 mg/L, and the rates were relatively low for out of this DO range. The respiration rate increased in the temperature range of ∼8☌–22☌, whereas the rate declined in the temperature range of ∼22☌–30☌. The maximum Tubificidae respiration rate was observed at a pH of 8.0☐.05, a rate that was more than twice as high as those observed at other pH values. L with 0.25 g (wet weight) of worms in 1 L test flask.Considering density of the worms, the highest rate was 81.72±5.12 mg O 2/g(dry weight) It was observed that the respiration rate was highest in the water discharged from an ecosystem that included symbiotic Tubificidae and microbes and was lowest in distilled water. The effects of the water quality, density of worms, pH, temperature and dissolved oxygen (DO) concentration on the respiration rate of Tubificidae were investigated to determine the optimal conditions for the growth and metabolism of the worms and reveal the mechanisms involving the efficient sludge reduction in terms of these conditions. The process conditions have effect on the growth, reproduction, and sludge reduction efficiency of Tubificidae. ![]() Tubificidae is often used in the wastewater treatment systems to minimize the sludge production because it can be fed on the activated sludge.
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