What are the special water qualities suitable for high salinity coagulants

High salinity flocculant (such as Polyferric Sulfate with salt base degree of 12% or more) is especially suitable for the following special water quality scenarios because of its long molecular chain structure, strong electro-neutralization ability and fast sedimentation speed:

🧪 1. High turbidity/high chromatic wastewater

Dyeing wastewater

High salinity flocculant (salinity 12%-16%) can adsorb dye colloidal particles efficiently, form dense flocs quickly, and significantly decolorize and reduce COD.

Advantages: the dosage is reduced by 10%-20%, and the settling speed is increased by more than 30%, especially suitable for wasteWater Containing reactive dyes or disperse dyes.

Paper/paper mill wastewater

It has a strong netting effect on high suspended matter (such as pulp fiber and leather debris) and avoids the loosening of flocs.

Note: The white water recovery process is prohibited (strong cation easily interferes with fiber recovery), and it is applicable to other sections.

❄ 2. Low temperature and low turbidity water quality

Reservoir/water river water in winter

In low temperature (<10℃) environment, ordinary flocculant hydrolysis is slow, while high salt base products have high degree of polymerization and can quickly bridge and adsorb fine colloids (such as algae and clay).

Case: When treating low temperature raw water containing algae, the algaecide rate is more than 90%, and the turbidity removal rate is increased by 25%.

⚠ III. Heavy metals and complex wastewater

Electroplating/metallurgical wastewater

High salinity flocculant can destroy the copper-ammonia complex (stable when pH=11), and precipitate heavy metal ions (such as Cu²⁺, Cr⁶⁺) through electro-neutralization.

Mechanism: there is little free Fe³⁺, and it mainly depends on the adsorption and bridging of polymer chains.

Phosphorus-containing Industrial Wastewater

When insoluble precipitates (such as FePO₄) are formed with phosphate, the removal rate of high concentration phosphorus (>10mg/L) is more than 95% when the salinity is greater than or equal to 14%.

🌊 4. Alkaline water quality (pH>9)

Applicability: The flocculant with high salinity degree can still maintain the stable flocculation effect in the range of pH 9-11, and avoid the failure of iron ion hydrolysis caused by the increase of pH in low salinity degree products.

Typical scenarios: chemical alkaline wastewater, papermaking black liquor pretreatment.

🌿 5. Micro-polluted water bodies and algae-containing water sources

Eutrophic water

The cell wall of algae (such as cyanobacteria and diatoms) has strong adsorption, and the sedimentation is accelerated by compacting algal flowers to wrap the algae cells.

Low organic pollution water sources

It can effectively remove trace organic matter (CODMn<5mg/L) and improve the odor of drinking water.

⚠ Precautions and restrictions

Data source: Engineering practice shows that high salinity flocculant needs to be adjusted dynamically —— for example, the turbidity of high turbidity water in rainy season can be raised to 16%, but long-term storage needs to be controlled ≤16% to prevent hydrolysis and precipitation.