JPS59173110A - Composition of polymer flocculating agent - Google Patents

Abstract

PURPOSE:To deodorize and to dehydrate the sludge simultaneously and efficiently by making the emulsive composition of polymer flocculating agent contg. a deodorant processable as a liquid substance. CONSTITUTION:The composition of polymer flocculating agent consists of 1wt% polymer flocculant, 0.05-2wt% water, 0.5-10wt% hydrophobic liquid and 0.01- 2wt% deodorant, and 0.1-15wt% emulsifier is added to 55-99.9wt% of the total. It is sufficient for the composition of the polymer flocculating agent to assume the form to be processed as a liquid having fluidity, and a water-in-oil type emulsion is preferable to satisfy the condition. The concn. of the polymer flocculating agent in emulsion is 5-65wt%. A water-in-oil type emulsion, prepared by an emulsion polymerization using an organic solvent which is insoluble or slightly soluble in water, is preferred as the hydrophobic liquid. The composition of polymer flocculating agent of the invention is diluted with water to 0.1- 0.5% concn. to be used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polymer flocculant composition that can efficiently dewater sludge in a favorable working environment.

Polymer flocculants are used as dehydrating agents for sludge from sewage, human waste, and various industrial wastewater. However, the foul odor generated by the sludge and its dehydrated cake deteriorates the working environment, and it is difficult to prevent the odor from being removed. This has become a major issue.

In order to solve this problem, methods of mixing or spraying deodorizing agents such as fragrances and essential oils into sludge were considered, but the deodorizing effect was poor, and in order to improve this, powdered polymer flocculants were added to deodorizing agents. A method of increasing the deodorizing effect by simultaneously dewatering and deodorizing the sludge by adding a deodorizing agent has been considered.

However, in this method, the polymer flocculant mixed with the deodorant must be used after being adjusted to an aqueous solution with a concentration of 0.1 to 0.5%, and it is difficult to handle it under closed conditions. , the working environment is worsening due to the strong odor of the deodorant itself.

In addition, if the deodorant has the same shape, it will have extremely poor miscibility with water or sludge, and if it is liquid, the fluidity of the polymer flocculant will be lost, so for example, if the polymer flocculant flows down from the hopper, This causes problems such as the deodorant's deodorizing effect, which significantly limits the amount of deodorant that can be used.

In order to solve these problems, the inventor of the present invention has developed the present invention as a result of intensive research into a polymer flocculant that can efficiently deodorize and dehydrate sludge in a good working environment. That is, the present invention is an emulsion-like polymer flocculant composition containing a deodorizing agent. Since the polymer flocculant composition of the present invention can be handled as a liquid, it can be transported, diluted, added to sludge, etc. It is possible to automate this work in a completely sealed environment, deodorize sludge and dewater it at the same time, and work efficiently while maintaining a good working environment.

The polymer flocculant composition of the present invention includes 1 part by weight of a polymer flocculant,
Consisting of a ratio of 0.05 to 2 parts by weight of water, 0.5 to 10 parts by weight of a hydrophobic liquid, and 0.01 to 2 parts by weight of a deodorant, a total of 85 to 999 weight % of these and 0.1 to 15 weight % of an emulsifier. Become. The deodorizer is added to a polymer flocculant emulsion obtained by an emulsion polymerization method or the like, or added when producing a polymer flocculant emulsion by an emulsion polymerization method. The emulsion polymerization method may be a known method, such as a method using a polymerization catalyst, ultraviolet rays, radiation, etc.

Furthermore, the polymer flocculant composition of the present invention may be in a form that can be handled as a liquid as specified in R1171 during transportation or other operations using it, and a water-in-oil emulsion that satisfies this condition is sufficient. is preferred. The concentration of polymer flocculant in the emulsion is 5 to 65% by weight.
The following are not preferred for economic reasons such as transportation.
If the amount is 65 or more, it is technically difficult to produce the emulsion.

The polymer flocculant used in the present invention may be any agent as long as it is effective in dewatering sludge, and generally a cationic agent is used. Examples of cationic polymer flocculants include acid addition salts such as dimethylaminoethyl methacrylate and N-dimethylaminopropyl methacrylamide, and homopolymers of ID quaternized salts, these salts and other vinyl monomers, such as acrylamide. Copolymers of polyacrylamide, Mannich-modified products of polyacrylamide, polyethyleneimine, acid addition salts of polyvinylimidacillin, etc. are used. Furthermore, as a dewatering agent for sludge, a cationic polymer flocculant and an anionic polymer flocculant can be used together, so the polymer flocculant used in the present invention may be anionic, for example, A homopolymer of acrylate, a copolymer of acrylate, acrylamide-2-methylpropanesulfonate, etc., and acrylamide, etc. are used.

The deodorant used in the present invention includes terpenes such as mengol, menthone, cineole, and geraniol, essential oils such as peppermint oil, lavender oil, perilla oil, eucalyptus oil, pine oil, and cedar oil, wood tar, and wood vinegar. etc. can be used. The amount of deodorizing agent added is determined by its deodorizing effect on sludge.
There is no particular limitation as long as the amount used is within the above range, and since the hydrophobic liquid in the composition also serves as a solvent, it can be added in any amount in either solid or liquid form.

The hydrophobic liquid used in the present invention is an organic solvent that is insoluble or slightly soluble in water, and may be any hydrophobic liquid commonly used in the production of water-in-oil emulsions by emulsion polymerization, such as heptane, Aliphatic hydrocarbons such as octane, alicyclic hydrocarbons such as cyclopenkune and cyclohexane, toluene,
Aromatic hydrocarbons such as xylene are preferred.

Furthermore, the emulsifier used in the present invention may be any emulsifier commonly used in the production of water-in-oil emulsions by emulsion polymerization, such as polyoxyethylene lauryl ether, polyethylene glycol laurate, polyethylene glycol monostearate, etc. , polyoxyethylene rubitan monolaurate, polyoxyethylene rubitan monolaurate, polyoxyethylene octylphenol ether, cetyl stearyl sodium phthalate, and the like.

The polymer flocculant composition of the present invention is used by diluting it with water to a concentration of 0.1 to 0.5%, like a normal polymer flocculant. This diluted liquid is added to the sludge and mixed to coagulate the solid content in the sludge, which is then filtered through a belt-type press filter or the like to separate it into a dehydrated cake and a liquid.

In these processes, the deodorizer dissolved together with the polymer flocculant is uniformly transferred into the dehydrated cake, and the dehydrated cake is deodorized. In these operations, especially dilution operations, the polymer flocculant composition of the present invention can be handled in a sealed manner, such as in piping, so that it does not contaminate the working environment.

The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Example 1 Methacryloyloxyethyl-trimethylammonium chloride 200g, acrylamide 100.9,2.2
'-azobis(2-amidinopropane) hydrochloride 0.21
7 was dissolved in 200 d of distilled water and cooled to prepare a cold monomer solution containing a polymerization initiator.

This cold bath liquid was gradually added to 400.9 g of cyclohexane containing 70.9 g of polyethylene glycol monostearate (polyethylene glycol monostearate) and 90 g of eucalyptus oil at 40° C. while stirring under nitrogen aeration.

This mixture was stirred at 40°C for 2 hours and then heated to 2.2'
5 M of a 10% aqueous solution of -Azobis(2-amidinopropane) Shiosaka salt was added, the temperature was raised to 60°C, and the mixture was further stirred for 2 hours, and then cooled.

The viscosity of the emulsion containing the produced copolymer and eucalyptus oil was 31c when measured at 25°C using a B-type rotational viscometer.
It was a stable emulsion with good fluidity.

Example 2 To an emulsion containing a copolymer obtained by reacting in the same manner as described in Example 1 without adding eucalyptus oil, 9 rJfl of eucalyptus oil was added with stirring to obtain a homogeneous milk extract: It was made into a liquid. This emulsion g had a viscosity of 31.5 cp when measured in the same manner as described in Example 1, and was a stable emulsion with good fluidity.

Comparative Example 3 g of eucalyptus oil was added to 100I powder of a copolymer of methacryloyloxyethyltrimethylammonium chloride and acrylamide used as a polymer flocculant and mixed. Separately, 101 g of eucalyptus oil was added to 100 g of powder of the same copolymer and mixed.

Hopper with an angle of 50° (length 12crrL).

When these powders were put into a flow port (diameter: 15 mm) and allowed to flow down from the flow port at the bottom of the hopper, the powder before mixing with eucalyptus oil naturally flowed down, but when 3 g of eucalyptus oil was added, The powder to which 10 g of eucalyptus oil was added did not flow down even when the hopper was vibrated.

Therefore, it has been found that when 3% or more of a liquid deodorant is added to the polymer agglomerates of powder, the fluidity of the powder decreases, making it difficult to handle.

Test Examples A) Emulsion containing the polymer flocculant obtained in Example 1 and eucalyptus oil, mouth) Emulsion containing the polymer flocculant obtained in Example 2 and eucalyptus oil, C) Emulsion obtained in the same manner as described in Example 1 using the same amount of No-Tsuka oil in place of eucalyptus oil; 2) Example using the same amount of No-Tsuka oil in place of eucalyptus oil. Emulsion obtained by the same method as described in 2), e)
Emulsion obtained in the same manner as described in Example 2 using the same amount of cedar oil in place of eucalyptus oil, and f) Eucalyptus oil 9
Table 1 shows the results of solid-liquid separation of sludge from a sewage treatment plant using emulsions obtained in the same manner as described in Example 2 using 0 g of eucalyptus oil 9I.

For comparison, g) Eucalyptus oil 3? Table 1 also shows the results when using the polymer flocculant emulsion obtained before adding eucalyptus oil in Example 2, and h) the polymer flocculant emulsion obtained before adding eucalyptus oil in Example 2.

The odor measurement was expressed as the average value of io number of sensory testers. The degree of pleasantness/displeasure of the odor and the intensity of the odor were measured according to the following criteria.

Pleasure/discomfort level of odor Odor intensity +1: Slightly pleasant 0: No odor 0: Neither pleasant nor unpleasant 1: Slight odor -1: Slightly unpleasant 2: Clear odor -2: Unpleasant
3: Strong odor - 3: Very unpleasant

Claims (1)

[Claims] An emulsion-like polymer flocculant composition containing a deodorant.