Online tools and calculators

Online calculators for quick, indicative checks of operational and design parameters in water and wastewater management. Results are indicative only – always verify against applicable standards, design documentation and measured data; AquIQ is not liable for any damages resulting from their use.

Wastewater

Oxygen and air demand

Indicative calculation of oxygen and air demand for aeration based on BOD5 and nitrogen load and aeration efficiency.

WWTP capacity and aeration volume from loading

Indicative WWTP capacity and required aeration volume from volumetric and biomass loading (Bv, Bx), biomass concentration X and the target PE.

WWTP retention times

Computes hydraulic retention times in anaerobic, denitrification, nitrification zones and secondary clarifier for average and maximum flow, without recirculation, with return sludge and with return sludge plus internal recirculation.

Flow non-uniformity and design flows

Calculates average daily flow and design peak / minimum flows from population, specific wastewater production and non-uniformity coefficients.

SRT-based sludge wasting

Calculator to set waste sludge flow to hit target SRT, including chemical sludge from ferric dosing.

Sludge production

Indicative sludge production estimate based on biomass parameters, plant loading and optional P-precipitation.

Phosphorus precipitation

Indicative calculation of 40% ferric sulphate solution dose for phosphorus precipitation based on flow, P concentration and selected P/Fe ratio.

Aluminium dose for filament control

Calculates the required aluminium dose in g Al/kg MLSS/day and converts it to the required dose of the selected chemical (aluminium sulphate, PAX 18, PIX XL2).

Activated sludge helper

Indicative operational guide for activated sludge troubleshooting: SVI, effluent suspended solids, turbidity, foaming, filamentous microorganisms, sludge age, dissolved oxygen and nitrification.

Concentration and mass conversions

Converts average flow and concentrations in mg/L into annual mass loads in t/year. Useful for indicative mass balances and discharge checks.

COD, methane, biogas and energy converter

Converter between COD, methane and biogas in various units, with indicative energy potential (heat and electricity).

Settling tanks

Highly indicative calculation of retention time, surface overflow and weir loading for secondary clarifiers and primary settling tanks, plus solids surface loading.

Slotted tank

Highly indicative sizing of sludge and settling compartments of a slotted tank based on PE, flows, treatment type and temperature coefficient.

Biofilter

Indicative calculation of minimum biofilter volume from organic and hydraulic loading, including volume per PE and estimated plan area and diameter.

Biological ponds

Indicative surface area of a biological pond from design PE, surface loading and primary treatment efficiency.

Drinking water

Coagulant dose

Indicative calculation of liquid coagulant dose (aluminium and iron coagulants) from raw water COD, flow and metal dose in mg Me/mg COD.

Iron & manganese oxidation

Indicative calculation of theoretical oxidant demand (hypochlorite, permanganate, chlorine, chlorine dioxide or air) for removing Fe and Mn from raw water given in mg/l and flow.

Iron & manganese removal helper

Decision-tree assistant for tuning oxidant dose and filter operation when removing iron and manganese.

Water hardness

Calculates water hardness from Ca and Mg concentrations in mg/l, including mmol/l, mg/l as CaCO₃, °dH and a qualitative classification (very soft/soft/moderately hard/hard/very hard).

Lime suspension and limewater preparation

Indicative lime saturator sizing: lime quality, suspension concentration, saturated limewater production and approximate calcium increase in treated water.

Calcium addition to water

Calculates the calcium required to increase Ca concentration in water – either by dosing lime suspension or saturated limewater.

Langelier index

Approximate Langelier index based on hardness, alkalinity, temperature and actual water pH.

Calcium carbonate / carbonic equilibrium

Indicative speciation of inorganic carbon between CO₂, HCO₃⁻ and CO₃²⁻ from acid/base capacity (KNK/ZNK) and water pH.

Hypochlorite dosing

Calculate hypochlorite solution dose from water flow and target concentration and propose dosing pump settings.

Radioactivity – concentration/activity conversion

Simple conversion between radionuclide activity in water [Bq/L] and mass concentration [µg/L] using the specific activity of the selected isotope.

General tools

COD, methane, biogas and energy converter

Converter between COD, methane and biogas in various units, with indicative energy potential (heat and electricity).

Alkalinity – alkali swap

Convert between doses of NaOH, Na₂CO₃, NaHCO₃ and Ca(OH)₂ and the corresponding alkalinity as CaCO₃.

Gas solubility in water

Indicative calculation of gas solubility in water using Henry’s law.

Mamutka (air-lift pump)

Indicative water flow and air demand for an air-lift pump using two methods.

Dosing pumps

Calculate dosing pump settings for continuous dosing and flow-proportional dosing (flow meter pulses).