acid sludge

acid sludge

[′as·əd ‚sləj]
(chemical engineering)
The residue left after treating petroleum oil with sulfuric acid for the removal of impurities.
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The AP reported that cellphone video shot by survivors show "blue-green puddles of acid sludge [surrounding] corpses without heads and torsos that jut out from the earth, skeletal hands seeming to claw at the ground."
In acid treatment process,oil is treated with sulfuric acid to remove aromatics and other non-hydrocarbons, followed by treatment with clay to neutralize and improve appearance, color and color stability by removing colored and colorless pigments and also improve oxidation stability of the final oil products [8-10].The acid sludge at the bottom, formed from the acid treatment of oil is a black or dark brown in color and containing some harmful sulfonic acid and some impurities [11,12].
Chemical characteristics of coastal acid sulfate soil, mine site acid sulfate soil, seawater-neutralised red mud, and sewage sludge used in the Australian component of this study Parameter Coastal Mine site Bauxsol[TM] Sewage potential acid sludge acid sulfate sulfate soil soil PH (A) 6.9 3.63 10.5 6.23 EC (dS/m) (A) 2.55 0.883 3.44 0.49 Sulfide-S (%) (G) 1.52 0.56 ANC (mmol/kg) 256 3550 TAA (mmol/kg) (F) 106 Mn (mg/kg) (B) 11 <0.005 489 Cd (mg/kg) (B) 0.9 <0.005 9.6 Cu (mg/kg) (B) 16 0.035 433 Zn (mg/kg) (B) 17.9 0.011 685 Pb (mg/kg) (B) <0.005 145 N[H.sub.4] (mg/kg) (E) b.d.l.