Flocculant suitable for papermaking wastewater treatment and use method thereof

Abstract

The invention provides a flocculant suitable for papermaking wastewater treatment, and the flocculant is prepared from the following components in percentage by mass: 5.8% to 7.4% of an organic polymer flocculant, 6.2% to 10.5% of ferric ions, 0.3% to 1.8% of lanthanide rare earth metal ions and 78% to 88% of water. The organic polymer flocculant is prepared from poly dimethyl diallyl ammonium chloride, chitosan and lignin. The flocculant suitable for papermaking wastewater treatment provided by the invention is excellent in flocculation effect and can be matched with anionic polyacrylamide tofully purify wastewater, and the treated wastewater is clear and colorless and meets the emission standard. The invention also provides a use method of the flocculating agent suitable for papermakingwastewater treatment, the operation is simple, and the labor force is reduced.

Description

technical field [0001] The invention relates to the field of flocculants, in particular to a flocculant suitable for papermaking wastewater treatment and a use method thereof. Background technique [0002] Papermaking wastewater refers to the wastewater generated during the pulping and papermaking process. Including pulping and cooking waste liquid, washing waste water, bleaching waste water and paper machine white water, etc. Papermaking wastewater contains a large amount of organic matter and suspended matter, as well as a large amount of chemicals and impurities. Papermaking wastewater has complex components and poor biochemical properties. It is a difficult industrial wastewater to treat and is one of the main industrial pollution sources in my country. [0003] The existing papermaking wastewater treatment process is mostly treated by chemical oxidation, such as Fenton oxidation process, Fenton oxidation process is under acidic conditions, H 2 o 2 in Fe 2+ In the pr...

AI Technical Summary

Problems solved by technology

[0004] 1. The labor intensity of the chemical process is high, and the operation of hydrogen peroxide is difficult. The ferrous sulfate must be solid, and the ferrous sulfate contains about 20% iron, which greatly increases the sludge treatment intensity compared to the 11% iron contained in polyferric. and high cost

2. Fenton oxidation process is easy to return color

If the dosing amount and dosing ratio of hydrogen peroxide and ferrous sulfate are not well controlled, or the ferric iron does not precipitate, it is easy to cause the wastewater to appear yellowish or yellowish brown

3. The Fenton oxidation process is difficult to control

Because the optimal ratio of hydrogen peroxide and ferrous sulfate needs to be obtained through orthogonal experiments, and is affected by the pH value of the reaction, the length of reaction time, and the degree of stirring and mixing, the ratio is difficult to control

4. The Fenton oxidation process is highly corrosive, and even the cement pool is corroded

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