Municipal water utilities are under increasing pressure to deliver safe, clear drinking water while managing tighter regulations, variable raw water quality, and rising sludge disposal costs. Onschem provides coagulants and flocculants for municipal water treatment, helping plants improve clarification, filtration performance, and overall chemical cost per m³.
Our product portfolio includes Polyaluminium Chloride (PAC), Polyferric Sulfate (PFS), Polyaluminium Ferric Chloride (PAFC) and Polyacrylamide (PAM) flocculants, supported by practical dosing recommendations and quality documentation for stable day-to-day operation.
Pain Points with Coagulants & Flocculants (PAC / PFS / PAFC / PAM)
1) Narrow operating window when raw water changes
When turbidity and NOM swing quickly, traditional dosing setpoints can fail. Underdosing causes poor settling; overdosing can increase residual metals and weaken filtration performance.
What needs to change: utilities need more robust coagulant selection (by basicity, content, and application scenario) and faster dosage adjustment guidance.
2) Residual aluminum/iron and customer complaints
Incorrect coagulant type, unstable quality, or poor dose control can increase residual Al/Fe, affecting water appearance and compliance confidence.
What needs to change: consistent product specifications, batch traceability, and clearer dosing control strategies to meet treated water targets.
3) Sludge handling is becoming a major cost center
Inefficient coagulation creates light, bulky sludge that is difficult to dewater—driving up polymer consumption and disposal costs.
What needs to change: optimize coagulant + PAM pairing to form stronger, denser flocs and reduce total sludge volume.
4) PAM sensitivity (overdose risk, filtration issues)
Polyacrylamide selection is often “trial and error.” Wrong ionic type or molecular weight can lead to floc breakage, restabilization, or filter fouling.
What needs to change: better matching of PAM charge type (anionic/cationic/nonionic) and molecular weight to the specific water and unit process.
5) Inconsistent quality and hard-to-compare offers
Different suppliers may deliver different active content, basicity (PAC/PAFC), or solubility behavior (PAM), creating unstable performance and repeated jar tests.
What needs to change: standardized QA/QC, COA, and consistent supply to protect plant performance.
Recommended Chemicals for Municipal Wastewater
✔ Anionic Polyacrylamide (PAM)
Ideal for flocculation and sludge dewatering.
Link → /products/anionic-pam
✔ PAC (Polyaluminum Chloride)
Fast coagulation, strong turbidity removal.
Link → /products/pac
✔ PAFC (Polyferric Chloride)
Reduced sludge volume, stable in low-temperature water.
Link → /products/pafc
✔ Activated Carbon (Powdered/Granular)
Removes odor, organic matter, color, and micropollutants.
Link → /products/activated-carbon
Key Benefits
*Faster floc formation and settling
*Wider pH application range
*Works effectively in low-temperature or variable-quality influent
*Lower sludge volume and reduced disposal cost
*High COD/BOD removal efficiency
Where It’s Used
*Municipal sewage treatment plants
*Urban wastewater treatment stations
*Decentralized wastewater facilities
*Reclaimed water production
Technical Support & Customization
We provide jar test optimization, dosage recommendation, and customized formulations for municipal influent with varying turbidity and organic load.
FAQ?
What is the difference between PAC, PFS and PAFC?
PAC is commonly used for general turbidity removal and fast clarification. PFS provides strong coagulation and reliable settling in many conditions. PAFC is often selected for more challenging raw water (higher color/NOM) and wider pH adaptability. The best choice depends on raw water quality, temperature, and process design.
How do I select the right PAM flocculant for a municipal water plant?
Selection depends on the charge requirement, molecular weight, mixing conditions, and whether PAM is used for clarification, thickening, or dewatering. A suitable PAM improves settling and filtration; overdosing or wrong type can cause poor floc formation or filter fouling.
Why does treated water turbidity increase even when chemical dose is higher?
Overdosing or wrong coagulant/flocculant combination can destabilize flocs, increase carryover, or shorten filter run time. Optimizing the coagulant grade, dose point, and PAM selection typically improves stability more than simply increasing dosage.
Do you provide documentation for municipal tenders and audits?
Onschem can provide standard quality documentation such as COA and product specifications. (You can replace this line with your exact capability: NSF/ANSI info, ISO, REACH, etc.