At acidic pH, positively charged aluminium species destabilize negatively charged particles mainly through adsorption and charge neutralization, aided by double-layer compression. Extensive aluminium-hydroxide sweep precipitation is favoured at a higher suitable pH. Thus **D** is the intended mechanism grouping.
More Water Treatment questions
GATE 2022 ES Q61– Water filters at .002 m/s through .67 m of uniform .4 mm spherical sand, SG2.65,porosity…
GATE 2021 ES Q19– What drives Type-I settling in a sedimentation tank?
GATE 2021 ES Q25– Among the listed pH values, where is chlorine most effective as a water disinfectant?
GATE 2021 ES Q33– A flocculation tank has velocity gradient800 s⁻¹,volume 40 m³,water viscosity9×10⁻⁴ N…
GATE 2026 ES Q44– Which statements about reverse osmosis (RO) are true? Select all that apply.
GATE 2026 ES Q45– Which statements about coagulation–flocculation are true? Select all that apply.