FeSO₄ 30% Liquid -- Direct Dosing Pump for WWTPs, No Dilution Required
Table of contents
FeSO4 30% liquid is a ferrous (II) sulfate solution in water at approximately 30% concentration (per batch COA), CAS 7720-78-7, light green in color, specific gravity 1.18–1.22 g/cm³ at 20°C. A direct dosing-pump solution for wastewater treatment — no mixing required, no dust, no agitator tank investment. Loc Thien delivers by 5–30 ton tanker trucks nationwide, COA per batch.
What Is FeSO4 30% Liquid? — Definition and Differences from Solid
FeSO4 30% liquid is a ferrous (II) sulfate solution in water with a reference concentration of approximately 30% by weight, CAS 7720-78-7. The solution has a characteristic light green color, specific gravity 1.18–1.22 g/cm³ at 20°C, and pH 2.0–3.5. This product is a coagulant/reducing chemical widely used in industrial wastewater treatment, supplying Fe²⁺ ions for coagulation, Cr6+ reduction, and biological phosphorus removal.
The main difference between liquid FeSO4 30% and solid FeSO4 98% (heptahydrate FeSO₄·7H₂O) lies in storage form and system introduction method. The liquid form is a ready-to-pump solution requiring no dissolution, no mixing tank, and generating no dust. The solid form is crystalline salt that must be dissolved in water before use, generates dust during pouring and mixing, and requires investment in a mixing tank and agitator motor.
Liquid FeSO4 is widely used in textile dyeing, electroplating, paper, and food processing wastewater treatment — where continuous Fe²⁺ dosing at stable concentrations via metering pumps is required. For plants with treatment capacities of 1,000–5,000 m³/day, FeSO4 30% liquid is the optimal choice for simplifying operations and minimizing human error.
5 Benefits of Choosing Liquid FeSO4
1. No Mixing — Direct Pumping into the System
Liquid FeSO4 arrives at the plant ready for use. The technician connects the suction hose from the storage tank/IBC to the dosing pump, sets the flow rate, and pumps directly into the coagulation tank. The entire setup takes under 10 minutes. No powder handling, weighing, dissolving, or mixing steps involved.
2. No Dust — Occupational Safety
Solid FeSO4 generates fine dust containing iron sulfate when poured into the mixing tank — causing respiratory irritation, especially in enclosed chemical rooms. The liquid form produces no dust, reducing PPE requirements and eliminating the need for exhaust ventilation.
3. Precise Dosing via Metering Pump
Dosing pumps allow setting the liquid FeSO4 injection rate with accuracy of ±1–2%. Compared with the solid form where workers mix by shovel and estimate by eye, the liquid form eliminates compounding errors. Fe²⁺ dosage remains stable over time, ensuring consistent effluent quality.
4. Save 30% on Labor
Plants using solid FeSO4 require 1–2 workers per shift for chemical compounding. The liquid form eliminates these steps entirely, freeing up personnel for system operation or other tasks.
5. No Mixing Tank Investment
Investment in a 2,000–5,000L stainless steel mixing tank with agitator motor for solid FeSO4 is a significant upfront capital expense. With the liquid form, the existing 1,000L IBC tank serves as the storage vessel — no additional mixing equipment needed.
Figure: On-site chemical dosing, storage tank operation, and batch COA inspection — Source: Loc Thien Chemical.
Technical Specifications
| Parameter | Value |
|---|---|
| Concentration | ~30% (per batch COA) |
| Fe²⁺ content | ~6–8% |
| Chemical formula | FeSO₄ (solution) |
| Color | Light green |
| Specific gravity (20°C) | ~1.18–1.22 g/cm³ |
| pH | 2.0–3.5 |
| CAS | 7720-78-7 |
| Packaging | IBC 1,000L, tanker truck 5–30 tons |
Applications in Wastewater Treatment
Phosphorus Removal Coagulation
Liquid FeSO4 30% provides Fe²⁺ to precipitate phosphate as Fe₃(PO₄)₂. The reaction occurs at pH 7.5–8.5, with dosage depending on the Fe:P molar ratio of approximately 1.5–2.0:1.
Cr6+ Reduction in Electroplating
Fe²⁺ reduces Cr6+ (hexavalent chromium) to Cr³⁺ (trivalent chromium) at pH 2–3: Cr₂O₇²⁻ + 6Fe²⁺ + 14H⁺ → 2Cr³⁺ + 6Fe³⁺ + 7H₂O. Theoretical dosage: 3.2 mg Fe²⁺ per mg Cr6+. After reduction, raise pH to 8–9 to precipitate Cr(OH)₃.
Decolorization of Textile Dyeing
Fe²⁺ reduces azo groups in dye molecules, breaking the aromatic ring structure that causes color. Combined with H₂O₂ in the Fenton reaction (Fe²⁺ + H₂O₂ → •OH + OH⁻), decolorization efficiency reaches 85–95% at pH 3–4.
Integration Guide
Basic Setup
IBC Tank → PVC Ball Valve + Y-Strainer → Diaphragm Dosing Pump → Back-pressure Valve → Injection Point into Coagulation Tank
Flow Calculation
FeSO4 liquid flow (mL/min) = Dosage (mg/L) × Flow (m³/h) × 1000 / (60 × SG × 1000 × %w/w). Example: 300 mg/L, SG 1.20, 100 m³/h → 138.9 mL/min.
Compatible Materials
PVC, HDPE, uPVC piping; HDPE or FRP tanks; PTFE/PVDF pumps; EPDM or PTFE seals. Avoid carbon steel, galvanized steel, brass, aluminum.
Operating Cost Comparison
| Criteria | Liquid FeSO4 (30%) | Solid FeSO4 (98%) |
|---|---|---|
| Mixing labor | 0 persons/shift | 1–2 persons/shift |
| Mixing tank + agitator investment | Not required | Required (2,000–5,000L tank + agitator) |
| Mixing electricity | 0 kWh | 5–15 kWh/day (agitator) |
| Loss from spillage/dust | <1% | 3–5% |
| Transportation cost | Higher (contains water) | Lower (concentrated) |
| Automation capability | High (direct pump) | Medium (requires mixing) |
For plants of 1,000–5,000 m³/day, switching from solid to liquid typically recovers the additional transport cost within 6–12 months through labor savings, reduced maintenance, and lower losses.
Where to Buy
Hoa Chat Loc Thien is a chemical manufacturer (Tax ID 0313650856, est. 2016) with 6 warehouses nationwide. FeSO4 30% liquid delivered by tanker truck 5–30 tons directly to your plant.
🛒 Need FeSO4 30% liquid? Get a quote — COA/MSDS per batch, tanker 5–30 tons nationwide. Hotline 0979 891 929.
Related articles:
- FeSO4 Industrial Overview & Applications — Pillar
- Comparison of FeSO4 Liquid 30% vs. Solid 98% — Cluster 2
- Jar Test Guide for FeSO4 — Cluster 3
Technical Support & B2B Procurement Hotline
Loc Thien Chemical specializes in direct manufacturing of FeCl₂ / FeCl₃ and direct industrial supply of basic chemicals (NaOH, HCl, H₂SO₄, PAC, NaOCl, H₂O₂, FeSO₄) with direct B2B pricing and dedicated 5–30-ton tanker delivery across Vietnam.
- Hotline / Zalo: +84 979 891 929
- Official Email: [email protected]
- Direct Manufacturer: Ferrous Chloride (FeCl₂ 30%) & Ferric Chloride (FeCl₃ 38–40%)
- Primary Supplier: NaOH 32%/45%/50%/99%, HCl 32%, H₂SO₄ 98%, PAC 30–31%, NaOCl 10–12%, H₂O₂ 35%/50%
- Compliance & Quality: FeCl₂ ZDHC MRSL v3.1 test report (Smart testing, 5 substance groups, TUV Rheinland Vietnam), ISO 9001:2015, Quatest 3, Full COA & GHS SDS
Industrial Field Operation & Batch Quality Verification
1. Incoming Batch COA Verification & Regulatory Compliance (Law on Chemicals 69/2025/QH15)
When operating industrial water treatment, surface finishing, or textile dyeing lines in Vietnam, engineering teams must verify every chemical delivery against its batch-specific Certificate of Analysis (COA) and 16-section GHS Safety Data Sheet (SDS). Under the Vietnam Law on Chemicals No. 69/2025/QH15, Decrees 24/2026/ND-CP, 25/2026/ND-CP, and 26/2026/ND-CP, and QCVN 40:2025/BTNMT on industrial wastewater discharge:
- Specific Gravity & Assay Verification: Upon arrival of a 5–30-ton tanker or IBC tote shipment, plant QA technicians measure specific gravity at 20 °C using a calibrated hydrometer and cross-check active concentration against the batch COA issued by Loc Thien Chemical and verified via Quatest 3 (ISO/IEC 17025).
- Impurity & Heavy Metal Control: Trace heavy metals (Fe, Pb, As, Hg, Cd, Cr⁶⁺) and insoluble matter are strictly controlled to prevent catalyst poisoning in Fenton reactors, membrane fouling in RO/UF systems, or shade deviations in reactive textile dyeing.
- ZDHC MRSL v3.1 Level 1 Portfolio Boundary: For export-oriented textile and footwear FDI factories, Loc Thien Chemical maintains official ZDHC MRSL v3.1 Conformance Level 1 documentation for exactly 9 core products: four products certified by TUV SUD Product Service GmbH (
NaOH,H2O2,Na2SO4,Na2CO3) and five products verified via Conformance Summary Report (CSR) and Analytical Test Report by TUV Rheinland Vietnam (H2SO4,FeCl2,HCl,Javel/NaOCl,PAC 31%).
| Control Stage | Inspection Parameter | Test Method / Standard | Operational Target |
|---|---|---|---|
| Pre-Unloading Check | Seal integrity, UN/GHS hazard placards, batch COA & SDS | Visual & Document Audit | 100% match with delivery manifest |
| On-Site Sampling | Specific gravity (20 °C), visual clarity, pH / assay | ASTM / TCVN / Hydrometer | Within ±0.5% of COA specification |
| Dosing Skid Calibration | Metering pump stroke & frequency, back-pressure valve, ORP/pH probe | 2-Point Buffer Calibration | Dosing accuracy ±1.5%, stable effluent |
| Storage Safety Audit | HDPE/FRP tank vents, secondary containment dike (110% volume), eyewash | OSHA / Vietnam EHS | Zero vapor leak, immediate emergency readiness |
2. Dosing Optimization, Storage Materials & Preventive Maintenance
- Compatible Wetted Materials: Use cross-linked high-density polyethylene (XLPE / HDPE), polypropylene (PP-H), fiberglass-reinforced plastic (FRP with vinyl ester resin), or PTFE/PVDF-lined piping depending on corrosive and thermal conditions. Avoid unlined carbon steel or incompatible elastomers.
- Automated Dosing Control: Integrate diaphragm metering pumps with real-time pH, ORP (mV), turbidity, or conductivity sensors. Always perform a 5-beaker Jar Test whenever raw water COD, TSS, or alkalinity shifts by more than 15%.
- Secondary Containment & PPE: Storage tanks must sit inside an acid/alkali-resistant bund wall holding at least 110% of the largest tank volume. Operators handling unloading hoses must wear splash-proof chemical goggles, acid/alkali-resistant nitrile or neoprene gloves, face shields, and emergency respirators.
3. Multi-Role B2B Value Matrix (Procurement · QA/EHS Engineer · Plant Director)
- For Procurement Managers: Loc Thien Chemical is the direct manufacturer of FeCl2 30% solution and FeCl3 38–40% wastewater grade (3,000+ tons/month capacity), and a Tier-1 bulk commercial supplier of NaOH, HCl, H2SO4, PAC, NaOCl, H2O2, FeSO4, and Na2SiO3. Pricing is transparently structured around 5 technical cost drivers (active assay, packaging format, delivery distance from our 6 warehouses, order volume, and scheduled contract cadence) with a 15-minute technical quotation SLA.
- For Environmental & Process Engineers: Full technical support for Jar Test optimization, stoichiometry calculation, sludge minimization, and QCVN 40:2025/BTNMT compliance auditing.
- For FDI Plant Directors: Guaranteed supply continuity via 6 regional warehouses (Ba Ria - Vung Tau, Dong Nai, Binh Duong, Da Nang, Can Tho, Bac Ninh) and a dedicated 5–30-ton tanker fleet (4 hours in inner HCMC, 24–48 hours across Southern & Mekong Industrial Parks, 2–3 days in Northern & Central Vietnam).
4. Related Technical Resources & 15-Minute Quotation Gateway
- Explore our full industrial catalog: Industrial Chemical Catalog | Technical Knowledge Hub | Request a 15-Minute Technical Quote
- Legal Head Office: 452/6B Tinh Lo 10, Binh Tri Dong Ward, Binh Tan District, Ho Chi Minh City, Vietnam (Head Office only — all physical stock is dispatched from our 6 regional industrial park warehouses).
- 24/7 Technical Hotline: 0979 891 929 (Please contact hotline 0979 891 929 for detailed delivery procedures) | Official Email: [email protected]
Extended Engineering Calculation Example & Jar Test Protocol for FeSO₄ 30% Liquid — Direct Dosing Pump for WWTPs, No Dilution Required
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
Extended Engineering Calculation Example & Jar Test Protocol for FeSO₄ 30% Liquid — Direct Dosing Pump for WWTPs, No Dilution Required
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
Extended Engineering Calculation Example & Jar Test Protocol for FeSO₄ 30% Liquid — Direct Dosing Pump for WWTPs, No Dilution Required
In a representative industrial wastewater treatment or surface treatment facility operating at a design flow of 1,200 m³/day (Technical Illustrative Example), process engineers evaluate dosing stoichiometry across three operating scenarios: baseline load, peak shift load (+25% COD/TSS), and seasonal rain dilution. Using calibrated 1,000 mL Jar Test beakers (rapid flash mixing at 180 rpm for 90 seconds, slow flocculation at 35 rpm for 15 minutes, and quiescent settling for 30 minutes), the plant establishes an optimal dosing curve that reduces chemical consumption by 12–18% while maintaining settled water turbidity below 3 NTU and effluent parameters well within QCVN 40:2025/BTNMT Column A. Every bulk shipment from Loc Thien Chemical includes batch-traceable COA analysis, GHS/SDS sheets, and on-site technical support across all 6 regional warehouses in Vietnam.
