Biological Excess-Sludge Reduction and Sludge Settleability Improvement Using a New Modified IFAS-OSA Process by Adding an Anoxic Sludge-Holding Tank to the Return Activated Sludge Line of the System

2021 ◽  
Vol 147 (2) ◽  
pp. 04020151
Author(s):  
Mansour Fazelipour ◽  
Afshin Takdastan ◽  
Seyed Mehdi Borghei
Keyword(s):  
Activated Sludge ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Excess Sludge Reduction ◽  
Sludge Settleability

Transformation and Migration of Heavy Metals by Aquatic Worms in Wastewater Treatment

2012 ◽  
Vol 573-574 ◽  
pp. 526-533
Author(s):  
Wei Fei Huang ◽  
Ying Gang Shu ◽  
Lu Cai ◽  
Sheng Liang Si
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Environmental Risk ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Safe Disposal ◽  
Waste Sludge ◽  
And Migration ◽  
Sludge Settleability

L. hoffmeisteri was inoculated in reactor to investigate the effects on waste sludge and wastewater to reduce excess sludge and reduce the environmental risk of heavy metals in sludge and effluent in this study. The result showed a gravimetric sludge reduction of 53.8% and modification in the texture of the sludge. The residual form of heavy metals (As, Cd, Cr, Cu, Ni, Pb and Zn) was increased, which reduced the risk of the phytoaccumulation. An evident concentration of heavy metals in worm faece and a bioaccumulation of heavy metals in aquatic worms were also observed. Activated sludge is reduced significantly, sludge settleability is improved and the bioavailability of heavy metals in waste sludge is minimized, which are beneficial to wastewater treatment and safe disposal of waste sludge.

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