Sterilizing and deodorizing method for paper making water and slime pulp controlling agent used thereby

Abstract

This invention provides an economical slime-controlling and deodorizing method in a papermaking process. The method for sterilizing and deodorizing water for the papermaking comprises adding a high-concentration aqueous solution of sodium hypochlorite in a hydrochloric acid condition, having pH>=4 and 1,000-10,000 ppm, preferably 2,000-8,000 ppm effective chlorine concentration to a water tank for a white water system or a recovered scum system, and regulating the effective chlorine concentration of the water so as to be 100-10 ppm. The method enables the reduction of the papermaking slime or deodorization to be achieved at an economical cost. The water for the papermaking after addition is effective even in a neutral region but is preferably used in a weak acidic region.

Description

technical field [0001] The invention relates to a method for sterilizing and deodorizing papermaking water and a used sludge control agent. Background technique [0002] The average annual consumption of paper reaches 250kg, and the requirements for recycling old paper are increasing day by day. On the other hand, in recent years, the pulp industry has promoted water-saving measures, and the units of water use have decreased year by year. As a result, the water quality in the system tends to deteriorate in conjunction with the recycling of used paper, and various problems related to it increase. [0003] In particular, the nutrient source in the papermaking water forms slime as a viscous substance due to microorganisms, which causes the problem of sludge due to concentration of the nutrient source and the like. Since there is no prediction technology for this problem, measures are taken to deal with it afterwards. In addition, it is the status quo that the bad smell envel...

AI Technical Summary

Problems solved by technology

As a result, the water quality in the system tends to deteriorate in conjunction with the recycling of used paper, and various problems related to it increase

[0003] In particular, the nutrient source in the papermaking water forms slime as a viscous substance due to microorganisms, which causes the problem of sludge due to the concentration of the nutrient source, etc.

Since there is no prediction technology for this problem, measures should be taken to deal with it afterwards

In addition, it is the status quo that the bad smell is shrouded in the papermaking process and the environment around the factory is deteriorated.

Therefore, various countermeasures such as using various organic halogen-based sludge control agents have been taken to suppress the occurrence of the sludge, but this is not effective when the bacteria have tolerance, etc., and the countermeasure requires a huge cost.

On the other hand, the current situation is that there is no effective deodorization method in odor countermeasures

Images