Ferrous sulphate polymerisation treatment of printing and dyeing wastewater

Ferrous sulphate polymerisation plays an important role in the treatment of printing and dyeing wastewater, as an efficient, environmentally friendly and cost-effective chemical agent, it has the following significant features and application advantages:

Highly efficient coagulation and decolouring ability:

Ferrous sulfate can rapidly ionize a large number of iron ions (Fe³⁺), which react with the dye molecules in the wastewater chemically or through physical adsorption to form flocs that are easy to precipitate and achieve high efficiency of decoloration.

In the decolourisation of printing and dyeing wastewater, polymeric ferric sulphate has strong adsorption bridging and sweeping effect on small pigment particles in water, which can achieve high degree of decolourisation.

COD removal effect:

Through its strong oxidising property, ferrous polymerised sulphate oxidises and decomposes some of the organic pollutants in the wastewater, which helps to reduce the Chemical Oxygen Demand (COD).

In wastewater treatment, ferrous sulfate polymerisation is widely used in biochemical tail water as a COD remover and wastewater coagulation treatment.

Phosphorus removal performance:

As an efficient phosphorus remover, ferrous sulfate polymerisation forms insoluble metal phosphate precipitation with phosphate in wastewater, effectively removing phosphorus from wastewater and helping to meet strict discharge standards.

Strong adaptability:

Ferrous sulphate polymerisation adapts to a wide range of water pH values from 4-11, the best pH range is 6-9, even in acidic environment, it can still maintain a certain coagulation activity.

The liquid form of ferrous sulfate usually has good solubility and mixing, can maintain good coagulation effect in a wide pH range, suitable for printing and dyeing wastewater changing water quality conditions.

High floc density:

When using ferrous sulphate polymerisation to treat printing and dyeing wastewater, the flocs formed are compact in structure and have a fast settling speed, which is conducive to the efficient subsequent solid-liquid separation process, thus improving the treatment efficiency of the whole wastewater treatment system.

Easy operation:

Liquid ferrous sulfate can be directly added to the wastewater treatment system, without the need for complex dissolution process, to facilitate the application of automated dosing equipment, which is conducive to the precise control of the dosage, to ensure the stability of the treatment effect.

Economy:

The dosage of ferrous sulfate polymerisation is less, the cost is low, the treatment cost can be saved 20%-50%, with significant economic benefits.

Safety:

Ferrous sulfate polymerisation has excellent water purification effect, good water quality, does not contain aluminium, chlorine and heavy metal ions and other harmful substances, non-toxic and harmless, safe and reliable.

In practical application, the steps of ferrous sulfate polymerisation treatment of printing and dyeing wastewater usually include pre-treatment, pharmaceutical injection, coagulation reaction, precipitation separation and post-treatment steps to ensure that the wastewater is effectively treated and discharged according to standards.

To sum up, with its excellent coagulation and decolourisation performance, COD removal capacity and phosphorus removal effect, ferrous polymerisation sulphate plays an important role in the treatment of printing and dyeing wastewater, and becomes an indispensable treatment agent in the field of environmental protection.

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