JPS60183021A - Filteration of sludge - Google Patents

Abstract

PURPOSE:To enable the application of a precoat filter machine to sludge, by facilitating the adsorption of flocs by forming the same by adding a high-molecular flocculant to a coal coke powder slurry and forming a leakage free coating layer. CONSTITUTION:3-10ppm of a high-molecular flocculant is added to a slurry of a coal coke powder with a particle size of 400mum or less to form floc and a cylindrical filter barrel is rotated in the floc formed slurry and the above mentioned coal coke powder is adsorbed by and laminated to the surface of the filter barrel to form a filter layer. Subsequently, the filter cylinder having the filter layer formed thereto is rotated in sewage to adsorb impurities by the surface of the filter layer and the adsorbed impurities are peeled off along with the laminated coal powder to regenerate the filtering surface and impurities are again adsorbed by the regenerated filtering surface. The concn. of the coating liquid is set to 20-30%.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a method for filtering sludge, etc., and in particular, in this invention, the surface of a P material is coated with a filter aid in advance to form a filtration layer, and this filtration layer is This is a so-called glycofilter that performs continuous K filtration while scraping off impurities in the liquid attached to the surface together with the coating layer and renewing the filtration surface.
1. Related to improvements in the filtration method in filters.

Diatomaceous earth is generally well known as a filter aid for conventional precoat filters, and a wide variety of other filter aids such as perlite and fine coal powder are also used. However, diatomaceous earth contains a large amount of non-combustible substances, and when it comes to incineration of filtered cakes such as sludge, it is difficult to incinerate and has little weight reduction effect. When using fine powder such as other coals, it is advantageous for incineration, but it is difficult to put into practical use for things that are generated in large quantities, such as sewage sludge, because the formation of a precoat layer is likely to occur. do not have.

This invention solves the above-mentioned difficulties in Glycoat filtration and makes it possible to apply the Precoat filtration machine to things that are generated in large quantities, such as sewage sludge. However, 3 to 10% of a polymer flocculant is added to a solution of coal coke powder with a particle size of 400μ or less to form a 70ml solution. The above-mentioned coal coke powder is adsorbed and layered on the surface of the filtration material by rotating it to form a temporary layer, and then the filtration material with the first layer formed thereon is rotated in waste water to remove the filtration material. The surface of the layer adsorbs contaminants in waste water, and the adsorbed contaminants are peeled off together with the laminated carbon powder to regenerate the transient surface and adsorb the contaminants again.

In other words, the greatest feature of this invention is that it can be coated in a coal coke powder bath M, which was difficult to coat in the past.
Adding a polymer flocculant to the liquid to form flocs facilitates K-adsorption and forms a coating layer that does not leak the coating 4A. The particle size of the coal coke powder used in this invention has the following particle size distribution. When coating, the concentration of the coating liquid is 20 to 3096, and 3 to IOP of a polymer flocculant is added to form flocs. After that, this was adsorbed and coated on the circumferential surface of a rotating drano to obtain the particle size distribution of the coal coke powder used (wet sieving method) (cumulative %) 0.84 m-2, OIII: 0.02WT* 0
．． 020.42 ~0.84: 0.04 0.06
0.25 ~ 0.42: 0.14 0.200.1
49 ~ 0.25: 6.20 6.400.074
~0.149: 23.20 29.600.04
4 ~ 0.074: 12.40 42.00004
4 or less: ss, oo 100.00 or less This invention will be explained based on Examples.

Example 1 A polymer flocculant (anionic) 4F was added to a 30% solution of stone and charcoal coke powder with the particle size distribution as described above to form flocs, and then a rotating filter cylinder was immersed (adsorbed) in the solution. When this was rotated and coal coke powder was adsorbed on its circumferential surface, after 5 minutes it became 20 fins thick and 3 fins thick.
A coating layer of 50 g was obtained after 0 minutes, 6511 g after 60 minutes, and 80 g after 100 minutes.

When fresh water and tap water were filtered with a rotating θj cylinder having a furnace material layer made of this coal coke powder, the t
The solubility of the t' solution was 8F'T.

Example 2 A polymer flocculant (anionic type) 5F was added to the 30th bath of coal coke powder with the same particle size nJ as in Example 1 to form flocs, and then a rotating ρ filter was applied to the solution for 1 hour. After soaking (adsorption angle J 180') and adsorbing coal coke powder around it, a coating layer of 201111 was obtained after 3 minutes, 55M after 30 minutes, 75sux after 60 minutes, and 35gm after 90 minutes. was completed.

When this coating layer was used to treat fresh water and tap water, the clarity of the p liquid was approximately 8P.

That is, it was confirmed that the thickness of the coating layer is 80 to 85 m and the clarity of the IP liquid is 8F, which can be used in place of conventionally used precoat materials such as diatomaceous earth without color retention.

As is clear from the above explanation, this invention has succeeded in forming a precoat overlayer using coal coke powder in the conventionally commonly used diatom ± VC range λ-, and has succeeded in forming a precoat overlayer in the sludge generated at large tK. Applying pre-coat ρ filter machine ++J
Noh + TC Shitamono De Ruri, and considering that coal coke powder is cheaper than conventional diatomaceous earth, etc., it is an industry standard.
1.The profits gained will be enormous.

Claims (1)

[Claims] (1) 3 to IOF of a polymer flocculant is added to a solution of coal coke powder with a particle size of 400μ or less to form flocs, and a cylindrical filtration layer is rotated in the bath liquid in which the flocs are formed. Then, the surface of the filtration layer is adsorbed and laminated with coal coke powder to form a filtration layer.Then, the filtration layer with the formed filtration layer is rotated in the waste water, and the surface of the first filter layer is coated with the sewage water. A filtration method for sludge, etc., characterized by adsorbing impurities, peeling off the adsorbed impurities together with laminated coal coke powder to regenerate the filtration surface, and adsorbing the impurities again.