Industrial Wastewater Compliance Solutions in Vietnam: Phosphorus & Heavy Metal Removal Guide

In Northern Vietnam’s industrial landscape (Bac Ninh, Thai Nguyen, Haiphong, Hai Duong), electronics manufacturing, metal finishing, and PCB companies dominate. However, while enjoying the supply chain benefits, companies face increasingly strict environmental supervision from the Ministry of Natural Resources and Environment (MONRE).

Specifically, the Grade A discharge limits in QCVN 40:2011/BTNMT (National Technical Regulation on Industrial Wastewater) for Total Phosphorus (TP) and Heavy Metals (Ni, Cu, Cr) are extremely low. Non-compliance can lead to massive fines or forced production shutdowns.

Hongyi New Materials provides not only high-performance industrial wastewater treatment chemicals but also localized solutions ranging from “Chemical Selection” to “Process Optimization” tailored to Vietnamese water quality.

Challenge 1: Total Phosphorus (TP) Exceedance – Pain Point for Electronics & Anodizing

In Aluminum Anodizing (polishing fluids containing phosphorus) and Phosphating processes, wastewater phosphorus levels often reach hundreds of ppm, while Vietnam’s Grade A standard typically requires < 2-4 mg/L. Traditional lime precipitation generates excessive sludge and often fails to meet strict standards.

Hongyi Solution: High-Efficiency Phosphorus Removal Agent

Our new generation agent targets difficult-to-treat hypophosphite, organic phosphorus, and orthophosphate.

• Deep Removal: Through multi-core polymerization, it captures trace phosphate ions to form tight, large precipitates. Field tests prove it can stably control Total Phosphorus below 0.5 mg/L.

• Wide pH Range: Unlike traditional iron salts, our agent works across a broader pH range, reducing the cost of acid/alkali adjusters.

• Sludge Reduction: The reaction products are dense and settle rapidly. The resulting chemical sludge has low water content, directly lowering filter press and hazardous waste disposal costs.

Challenge 2: Heavy Metals & Hexavalent Chromium – The Red Line for Plating

Electroplating wastewater (containing Ni, Cu, Cr) is the primary focus of environmental inspections. Hexavalent Chromium (Cr6+) is particularly toxic and difficult to treat.

Hongyi Solution: Specialized Reducing Agents & Heavy Metal Catchers

• High-Efficiency Reducing Agent: For chromium-containing wastewater, we supply high-purity Sodium Bisulfite and composite reducing agents. In acidic conditions, they rapidly reduce toxic Cr6+ to lower-toxicity Cr3+ for subsequent precipitation. The reaction is complete with no residue risk.

• Heavy Metal Chelating Agent: For complexed Nickel and Copper ions (which traditional alkaline precipitation cannot remove), our organic sulfur-based catchers break the complex structures and strongly chelate metal ions. This ensures discharge levels of Ni < 0.1 mg/L and Cu < 0.5 mg/L, perfectly meeting QCVN standards.

Challenge 3: Suspended Solids (SS) & COD – General Efficiency

Regardless of wastewater type, the efficiency of solid-liquid separation (Flocculation/Sedimentation) directly determines effluent quality and COD removal rates.

Hongyi Solution: The Golden Duo of PAM & PAC

• Polyaluminum Chloride (PAC): We supply the Vietnamese market with high-content PAC powder (Al2O3 > 30%). It forms flocs quickly and effectively, performing well even in low-temperature, low-turbidity water.

• Polyacrylamide (PAM Flocculant): Available in Anionic, Cationic, and Non-ionic grades.

  • Anionic PAM: Ideal for coagulant aid in inorganic wastewater, increasing settling speed by over 10 times with low dosage.

  • Cationic PAM: Specialized for Sludge Dewatering Machines (Belt press, Centrifuge). It significantly reduces sludge water content, yielding drier sludge cakes and saving you massive amounts on tonnage-based waste disposal fees.

Why Choose Hongyi’s Environmental Solutions in Vietnam?

1. Jar Test Support: Wastewater quality varies constantly. We refuse blind selling. We offer Free Water Analysis & Jar Test Selection. Our engineers will visit your factory in Bac Ninh or Haiphong to demonstrate the chemical effectiveness on-site with data.

2. Local Stock Availability: Wastewater chemicals are high-consumption items; shortages mean production risks. We maintain large warehouses in Northern Vietnam, stocking hundreds of tons of PAC, PAM, and Phosphorus Removal Agents, ensuring delivery within 24 hours.

3. Cost Optimization: We help you not just comply, but save. By optimizing dosing sequences and quantities, we typically help clients reduce chemical operating costs by 15%-20%.

Frequently Asked Questions (FAQ)

Q1: Which standard governs industrial wastewater discharge in Vietnam?

A: Primarily QCVN 40:2011/BTNMT. Depending on the receiving water body, it’s divided into Grade A (water supply source) and Grade B (irrigation/transport). Most new industrial zones require pre-treatment to Grade B or A before entering the park’s pipe network.

Q2: Can Hongyi’s Phosphorus Removal Agent treat Hypophosphite (Electroless Nickel wastewater)?

A: Yes. For hypophosphite from electroless nickel plating, simple precipitation is limited. Hongyi offers a “Catalytic Oxidation + Precipitation” combined process to first convert hypophosphite to orthophosphate, ensuring compliance.

Q3: Do you offer operation and maintenance (O&M) for wastewater plants?

A: We currently focus on providing high-quality chemicals and technical guidance. However, we have deep partnerships with certified environmental engineering firms in Vietnam and can recommend reliable O&M teams for you.

Looking toIndustrial Wastewater Compliance Solutions?

Contact the Hongyi Engineering Team today for free samples and a bath analysis report.

• Zalo/ Hotline: 0827 626 966
• Address: Nhà Xưởng F.A3, lô CN3-03, Khu phi thuế quan và KCN Nam Đình Vũ (khu 1), thuộc Khu Kinh tế Đình Vũ – Cát Hải, Phường Đông Hải 2, Quận Hải An, Thành phố Hải Phòng, Việt Nam