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Membrane operations calculator

Membrane Cleaning & CIP Chemical Dosing Calculator

Screen three distinct chemical-cleaning arrangements: concentrate dosed into backwash water, prepared cleaning solution, and membrane modules soaked in a dedicated cleaning chamber.

Manufacturer approval is mandatory. These screens perform dilution and consumption arithmetic only. They do not select chemistry, concentration, sequence, contact time, temperature, material compatibility, cleaning trigger, waste handling, or safety controls. Never mix acid and hypochlorite; rinse and isolate sequential steps.
Display label for all direct chemical-cost outputs. No exchange-rate conversion is applied.
Mode 1

Backwash-Based CIP Dosing

Use when an approved chemical concentrate is metered directly into a defined membrane backwash stream.

Backwash dosing inputs

Target dose is active chemical in the backwash water; product strength is active mass percent.

Backwash stream and active dose
m³/h during chemical backwash
minutes per cleaning event
mg/L active chemical in backwash water
Commercial concentrate and pump duty
active mass percent
kg/L
minutes; may be shorter than backwash
percent of selected pump rating
Annual usage and day tank
events/year
currency/kg commercial product
days of average annual use
percent above calculated coverage

Backwash concentrate and pump results

Per-event concentrate requirement, annual chemical usage, and preliminary metering-pump capacity.

Mode 2

Chemical Solution Based Cleaning

Use when prepared oxidative and acid cleaning solutions are made up and applied sequentially to a cleaning loop, tank, or module train.

Prepared-solution inputs

All concentrations are active-chemical targets in the prepared cleaning solution.

Common cleaning volume
m³; include module, pipework, and cleaning-tank working volume as applicable.
Oxidative step — sodium hypochlorite
mg/L as active NaOCl
events/year
active mass percent
kg/L
currency/kg commercial product
Acid step — citric acid
mg/L as citric acid
events/year
active mass percent
kg/L
currency/kg commercial product

Prepared-solution results

Sequential oxidative and acid steps are screened separately; do not combine their products.

Mode 3

Module Soaking / Cleaning Chamber

Use when modules are placed in a dedicated chamber and each batch is soaked in a fresh, approved chemical solution. Enter the chamber’s actual working volume; module count does not determine solution volume automatically.

Soaking chamber inputs

Screen solution make-up, fresh batches, annual product demand, and nominal storage for the actual chamber operation.

Chamber and batch arrangement
m³ of fresh chemical solution per batch
for cleaning-throughput reporting
each batch is assumed to use fresh solution
hours; used for chamber occupancy only
Approved chemical and annual programme
mg/L in chamber solution
campaigns/year
active mass percent
kg/L
currency/kg commercial product
days of average annual use
percent above calculated coverage

Chamber chemical and annual-use results

Fresh-solution batch chemistry, module cleaning throughput, annual demand, and nominal concentrate storage.

Governing chemical-dose calculations

Backwash-based CIP dosing

Backwash volume per cleaning = Backwash flow (m³/h) × Backwash duration (min) ÷ 60
Active chemical mass = Backwash volume (m³) × Target dose (mg/L) ÷ 1,000
Commercial concentrate volume = Active mass ÷ Product active-mass fraction ÷ Product density
Required dosing-pump flow = Concentrate volume ÷ Injection duration (min) × 60

Chemical solution / chamber-soaking make-up

Active chemical mass per fresh solution batch = Working solution volume (L) × Target concentration (mg/L) ÷ 1,000,000
Commercial product mass = Active chemical mass ÷ Product active-mass fraction
Commercial product volume = Product mass ÷ Product density
Annual product demand = Product per fresh batch × Fresh batches/year
Nominal storage = Annual product volume × Storage coverage (days) ÷ 365 × (1 + storage margin)

Scope and limitations

Use actual backwash volume, actual chamber working volume, product assay, product density, and approved cleaning frequency. This calculator does not model concentration decay, residual chemical, rinse requirements, neutralisation, cleaning-waste handling, circulation hydraulics, permeability recovery, membrane ageing, or production downtime.

MBR chemical-cleaning procedures are manufacturer- and fouling-specific. Do not infer a concentration or soak protocol from this arithmetic alone.[1] [2] [3]