Coagulant Dosing
Calculate the coagulant consumption of a water treatment plant, consumption = flow × dose ÷ 1000, multiplying the treated flow (m³/day) by the coagulant dose (mg/L) set by jar test. The result, in kg/day, sizes the storage, dilution and dosing pumps for products such as aluminium sulphate, ferric chloride or PAC, ensuring efficient coagulation of colloidal particles. Enter the treated flow and the coagulant dose.
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Dosagem de coagulante
Na estação de tratamento de água (ETA), a primeira etapa química é a coagulação: adiciona-se um coagulante — sulfato de alumínio, cloreto férrico ou policloreto de alumínio (PAC) — que neutraliza a carga elétrica das partículas coloidais em suspensão, permitindo que se aglomerem em flocos e depois decantem. A dose ideal (em mg/L) é determinada no laboratório pelo ensaio de jar test, simulando a coagulação em béqueres com doses crescentes. Conhecida a dose, o consumo diário sai de consumo = vazão × dose ÷ 1000, que converte a vazão tratada (m³/dia) e a dose (mg/L = g/m³) em kg/dia de produto. Esse número dimensiona o estoque no almoxarifado, a capacidade dos tanques de diluição e a vazão das bombas dosadoras. Dose de menos deixa a água turva (coagulação incompleta); dose de mais desperdiça produto, eleva o custo e pode deixar residual de alumínio ou ferro na água tratada. Por isso a dosagem é constantemente reajustada conforme a turbidez e a cor da água bruta variam. Informe a vazão tratada e a dose de coagulante.
Related Tools
Chlorine Demand
Calculate the chlorine demand of a water, demand = applied dose − chlorine residual, subtracting the measured chlorine residual (mg/L) from the applied chlorine dose (mg/L). The result, in mg/L, is the chlorine consumed by organic matter, ammonia, iron, manganese and other reducers before free chlorine remains for disinfection. Knowing the demand is essential to dose chlorine correctly and keep an adequate residual in the network without waste or underdosing. Enter the applied dose and the measured residual.
Velocity Gradient (Mixing)
Calculate the mean velocity gradient (G) in rapid-mix and flocculation chambers, G = √(P ÷ (μ × V)), from the dissipated power (W), the water dynamic viscosity (Pa·s) and the chamber volume (m³). The result, in s⁻¹, measures mixing intensity: rapid mixing needs high G (700–1000 s⁻¹) to disperse the coagulant, while flocculation uses low G (20–70 s⁻¹) to promote floc collision and growth without breaking them. Enter power, viscosity and volume.
Corrosion Inhibitor Efficiency
Calculate the efficiency of a corrosion inhibitor, η = (CR₀ − CR_inh) ÷ CR₀ × 100%, comparing the corrosion rate without inhibitor (CR₀) with the rate in its presence (CR_inh). The result, in %, measures how much the inhibitor slowed corrosion — the standard indicator to evaluate and compare inhibitors in laboratory tests (mass loss, polarization or impedance). Effective inhibitors form protective films on the surface and reach efficiencies above 90%. It is widely used in boiler water treatment, cooling systems and well acidizing. Enter the corrosion rates without and with inhibitor.
The results provided by this tool are for general informational and educational purposes only and do not constitute professional, financial, medical, legal, tax or accounting advice. Always confirm important decisions with a qualified professional and official sources.