1. Water analysis
Typical decision inputs include pH, TDS/conductivity, hardness, alkalinity, silica, iron, turbidity and—where relevant—COD, BOD, TSS, oil & grease, colour and microbiological parameters.
Engineering knowledge base
Technical Resources for Water & Wastewater Treatment
A practical reference layer for plant managers, engineering teams and procurement professionals. Use it to prepare a technical enquiry, compare treatment approaches and identify the operating data required before final equipment or chemical selection.
Start with the data
A good treatment design begins with a good water-quality picture.
For an initial review, provide the source water or effluent analysis, required flow, operating hours, target treated-water quality and any existing plant information. Final process selection, chemical programme and equipment sizing should be confirmed against actual site conditions.
2. Capacity
State average and peak flow, daily operating hours, storage available and whether the system is continuous, batch or campaign based.
3. Product-water target
Define the actual end use: process water, cooling make-up, boiler feed, utility water, reuse or another specified quality. The target determines the treatment train.
4. Existing plant
Share P&IDs, equipment nameplates, membrane data, chemical consumption, operating trends, photos and recent test results when available.
System reference
Choose the engineering topic
Industrial RO
Feed-water pretreatment, membrane performance, recovery, scaling control and monitoring.
ETP
Industrial effluent treatment with physical, chemical and biological process stages selected for the wastewater characteristics.
STP
Sewage treatment, biological process control, clarification, disinfection and reuse considerations.
DM / polishing
Ion-exchange demineralisation and polishing for low-conductivity industrial water duties.
Softening
Hardness reduction where calcium and magnesium scaling limits downstream equipment or process performance.
Boiler water
Scale, corrosion, blowdown and chemical-control considerations for steam-generation systems.
Cooling water
Cycles of concentration, scale, corrosion, microbiological control and blowdown optimisation.
Reuse / ZLD
Membrane polishing and concentrate-management concepts for high-reuse applications.
First-hand engineering method
Design calculations we actually use to frame a treatment problem
RO recovery & mass balance
For a first-pass water balance, recovery = permeate flow ÷ feed flow. Concentrate flow is the feed minus permeate. Recovery is then checked against feed chemistry, membrane-element limits, scaling risk, pressure and the required reject-management route.
Example: 10 m³/h feed at 75% recovery gives about 7.5 m³/h permeate and 2.5 m³/h concentrate before other losses.
ETP organic load
Organic loading is framed from flow × concentration. COD load in kg/day is approximately Q (m³/day) × COD (mg/L) ÷ 1,000. This makes wastewater treatment sizing auditable instead of relying only on nominal tank capacity.
Final biological/chemical design also considers biodegradability, peak load, temperature, nutrients, sludge yield and discharge/reuse criteria.
Cooling-tower concentration
Cycles of concentration can be approximated from a conservative dissolved-solids or conductivity ratio between circulating water and makeup water. Blowdown demand then depends on cycles, evaporation, drift and other losses.
The ratio is a diagnostic starting point; actual control limits depend on metallurgy, chemistry, microbiology and the treatment programme.
Boiler chemistry control
Boiler treatment is not a universal chemical dose. Feedwater quality, pressure, condensate return, blowdown, oxygen ingress, alkalinity and the boiler/OEM limits determine the control programme and monitoring frequency.
Use current test data and the equipment supplier's operating limits before changing chemical dosage.
Commissioning & troubleshooting
Evidence-led troubleshooting sequence
1. Establish the baseline
Record flow, pressure, temperature, conductivity/TDS, pH and relevant process chemistry before changing settings.
2. Separate process from equipment faults
Compare current readings with nameplate/design data, membrane performance, pump curves, instrument calibration and maintenance history.
3. Change one variable at a time
Document chemical dose, valve position, backwash/CIP event or operating change and compare the next validated sample.
4. Close the loop
Capture the result, remaining risk, recommended maintenance action and the next measurement date in the operating record.
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Cooling towers
Reuse
Compliance
Water efficiency
Design for reuse, not just treatment.
Industrial water systems can often be improved by separating water qualities, reducing unnecessary losses, controlling cooling-tower concentration, and evaluating treated-water reuse. The appropriate route depends on water chemistry, process requirements, economics and applicable permissions.
Monitor concentration and blowdown
Water-efficiency guidance highlights cycles-of-concentration management, side-stream filtration and automated chemical-feed/blowdown controls as potential opportunities where appropriate.
Match quality to end use
Reuse planning should start from the actual end-use water-quality requirement rather than treating every stream to the same specification.
Use the applicable standard
Drinking-water applications in India should be evaluated against the applicable BIS specification; IS 10500:2012 is the published drinking-water standard referenced by BIS.
Reference documents
External technical references
BIS — IS 10500:2012
Indian Standard for drinking-water specification. Use the applicable current standard and amendments when defining potable-water requirements.
NITI water-efficiency reference
Example best-practice material covering cooling-tower efficiency, side-stream treatment, reuse and automated control opportunities.
Reference documents are provided for engineering context. They do not replace applicable statutory requirements, OEM instructions, site-specific laboratory analysis or professional engineering review.
Procurement-ready
What to send with an enquiry
Plant requirement
Capacity, source, operating hours, required recovery and intended use of treated water.
Water chemistry
Latest laboratory report, preferably with sampling date and units clearly stated.
Existing equipment
Make/model, membrane type, pump details, chemical dosing, instrument readings and maintenance history where applicable.
Commercial scope
Supply only, turnkey installation, commissioning, O&M, AMC, chemicals, spares or a combined programme.