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 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 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.
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]
Membrane cleaning and CIP dosing basis
Documentation revision: 2026-10-02. This page documents the calculation basis so an engineer can trace the inputs, units, assumptions, and review needs. Results are preliminary screening estimates; they are not a permit determination, OEM guarantee, or construction/procurement approval.
Method and source basis
The calculator performs chemical mass-balance arithmetic for backwash dosing, prepared solution, or soak modes. Active chemical mass is derived from solution volume and target concentration; commercial product mass and volume then use entered strength and density. Annual demand and direct chemical cost are calendar multiplications.
The sources below provide technical context or analytical/design methodology. They do not endorse this calculator's defaults, and any jurisdiction-specific requirement applies only where that authority has jurisdiction.
U.S. EPA, Membrane Bioreactors Wastewater Management Fact Sheet (2007)
WEF Manual of Practice No. 36, Membrane Bioreactors
Judd Water & Wastewater Consultants, Membrane cleaning guidance
Assumptions, limitations, and review actions
This page does not select chemistry, concentration, pH, temperature, contact time, circulation pressure/flow, cleaning trigger, compatibility, rinse endpoint, neutralization, or waste-disposal method. Use the exact membrane OEM manual, SDS, TDS, and permit.
Keep oxidative and acid steps separate and validated; never mix acid and hypochlorite. Product strength, active-chemical basis, assay, density, and final concentration must be confirmed for the actual product.
CEB/maintenance cleaning and recovery CIP are different operations. The pump result is only a volumetric screen and excludes pressure, viscosity, turndown, calibration, NPSH, materials, controls, and redundancy.
Professional review checkpoint
Before using the result for specification or operation, reconcile it with representative site data, the applicable permit and design standard, the selected equipment or membrane supplier's current data, and a qualified wastewater/process engineer. Record the input basis, date, units, and any pilot, bench-test, or comparable full-scale evidence used to select the assumptions.
