Media Filtration MMF
Granular-bed filtration that removes suspended solids ahead of a membrane, sized here from design flow, filtration rate and bed geometry.
- Active
- Partial
Feedwater Screening & Treatment Selection Screening
Compares a stated or measured feedwater analysis against the barriers a desalination pretreatment train can actually contain, raising a candidate only from a fact you supplied or the platform derived — and reporting its own confidence rather than choosing for you.
Overview
Compares a stated or measured feedwater analysis against the barriers a desalination pretreatment train can actually contain, raising a candidate only from a fact you supplied or the platform derived — and reporting its own confidence rather than choosing for you.
How it works
Separation mechanism and feed window. Applies to any feed that can be described by an analysis. It does not require the feed to be treatable — an unbalanced or absent analysis is reported as such, not smoothed over.
What the process produces. No product water is produced. The output is a set of candidate barriers with the reason each was raised, plus the facts the screen could not use.
Energy. None. A screening step consumes no energy and sizes nothing.
Process sequence
Where this technology normally sits in a treatment train. The steps either side of it are documented in the Library as separate entries.
- Feedwater analysis
- Barrier screening
- Candidate sizing on the relevant calculator
Typical applications
- Deciding which pretreatment barriers a new seawater or brackish feed needs
- Checking an existing analysis before committing to a membrane basis
- Identifying which missing measurement is actually blocking a decision
Main equipment
- None. This is an analysis step, not a process.
Key design parameters
The parameters an engineer actually sets, and why each one drives the design. EngiMetric does not assume any of them.
| Parameter | Why it matters |
|---|---|
| Calcium and alkalinity (as CaCO₃) | Hardness and the cation–anion charge balance are both built on these two. |
| TDS, pH and temperature | Together with calcium and alkalinity these are what the carbonate scaling engine needs; temperature is the one most often left out. |
| Free or residual chlorine, SDI, turbidity | Stated barrier indicators. None is derived here, and their absence means those barriers were not screened. |
| TOC, iron, manganese | Stated drivers for the organic and oxidation barriers. |
Advantages
- Shows which barriers the evidence actually supports, and why.
- Names the missing measurements instead of screening around them.
- Reuses the authoritative chemistry engines rather than a second model.
Limitations
- Raises candidates; it never selects one.
- Every barrier indicator is a stated figure — the platform does not measure turbidity, SDI, chlorine or TOC.
- Confidence refers to the chemistry supplied, not to whether the answer is complete.
Engineering considerations
- An absent turbidity or SDI means the particulate and biofouling barriers were not screened at all. That is a gap in the evidence, not a clean result.
- A charge balance outside the usual guideline normally means an ion is missing from the analysis rather than that the water is unusual.
Status and EngiMetric support
Industry maturity and commercial status describe the technology itself. EngiMetric support and quantitative modeling describe what this platform does with it — and those two are read from the engineering registry at build time, so they cannot drift from the code.
- Engineering maturity
- Mature How established the technology is in the industry. Not an EngiMetric claim.
- Commercial status
- Commercial Where the technology sits in the market. Not an EngiMetric claim.
- EngiMetric support
- Active Derived from the execution registry: screening is registered as supported.
- Design engine
- Planned Whether the Plant Designer can carry this as a configured process step.
- Quantitative modeling
- Available Derived: 1 of 1 registered capabilities run a deterministic engine.
What EngiMetric computes
These capabilities are registered in the EngiMetric execution registry. Each one runs a deterministic engine, so every result is reproducible from the inputs you supply.
- RO pretreatment barrier screening screenPretreatment
Related tools
Every tool below exists and is live. EngiMetric does not duplicate a formula here — the calculation lives in the tool, and this page links to it.
- Water Analysis & Treatment Selection The analysis, the barrier candidates, and the list of facts the screen could not use.
- RO Scaling Risk & Pretreatment Analysis Saturation indices when the chemistry needed to run them is complete.
- RO Antiscalant & Chemical Dosing Calculator Dosing once a scaling barrier has been identified.
- Cartridge Filter Sizing Calculator Sizing a cartridge barrier the screen raised.
Sources and references
- Barrier indicators — Turbidity, SDI, chlorine, TOC and metals are engineer-supplied measurements.
EngiMetric does not publish a bibliography of external literature for catalogued technologies. Where a figure is required, it is entered by the engineer from a datasheet or a published reference, and it is labelled as an input.