JPS5881499A - Treatment of sludge - Google Patents

Abstract

PURPOSE:To accelerate dehydration during spontaneous dehydration, while inhibiting the formation of an offensive odor, by mixing coal ash or the incineration ash of filature sludge or the like in sludge formed in the process of purifying filthy water such as industrial waste water or sludge containing excretions or these concentrated matter, and agitating the mixture. CONSTITUTION:To 100ml waste water from a plywood factory, 1g the incineration ash of sludge from a filature is added and agitated, sodium hypochlorite is added and agitated, and then pH is made acid by ferric chloride. Thereafter, pH is returned to neutral by the addition of caustic soda, and flocks are formed by macromolecular substance and completely precipitated. As the incineration ash, the incineration ash of coal or the incineration ash of municipal sewage sludge may be used. By mixing said incineration ash in the sludge, the dehydration of the sludge can be accelerated, the conversion of the sludge into compost of fuel can be promoted, and the formation of secondary public pollution caused by an offensive odor can be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a treatment method for promoting dewatering from sludge, and throughout this specification, sludge refers to sludge generated through the treatment of sewage, urine, livestock wastewater, and industrial wastewater. It is used as a general term for sludge, excrement, and their concentrates.

BACKGROUND ART Nowadays, in an effort to save energy, in order to make effective use of sludge, sludge is naturally dehydrated and turned into fertilizer or fuel. However, natural dehydration takes a long time, 2 to 3 months, and there is a problem in that it produces a bad odor during the dehydration period, and it requires a large plot of land far from residential areas to turn it into fertilizer or fuel. It was necessary.

Furthermore, sludge is also treated by incineration, but the amount of incinerated ash increases and its disposal becomes a problem. Furthermore, due to the switch to coal as fuel at thermal power plants, an increase in coal ash has also become a problem.

This invention was made with the aim of solving both of these problems at once.The above-mentioned incineration ash (including coal ash), which is difficult to dispose of, is mixed in and stirred to promote dewatering from the sludge, and to make fertilizer. This process not only reduces the amount of oxidation and fuel used, but also deodorizes it.

It is clear from the following two experiments that this invention has effects on dehydration and odor.

The first experiment was to mix xg of incinerated ash from paper mill sludge into 1oOml of wastewater from a plywood factory, stir it, add sodium hypochlorite and stir, acidify the pH with ferric chloride, and add caustic soda to the mixture. The mixture was returned to neutrality, and finally, flocs were made with a polymer and completely settled, and the wastewater itself was mixed at 18.5. The time required for filtration with NO.3 filter paper was measured. The above incineration ash contains 12.62% Si, q, 53% AI, and 0 Fe.
．． 36%, contains 1.04% Ca, and is A from X-ray diffraction etc.
N2 S140. It is thought that (OH)2 is present. The results are shown in the table below.

In the second experiment, 100 f of pig manure with a moisture content of 90% was mixed with 10 g, 2 of, and 30 p of the above-mentioned incinerated ash and stirred for 5 minutes. The sample was placed on a 18.5crnN0.3 filter paper, left in the shade, and the moisture content and odor were measured at 9:00 a.m. every day.

As can be seen from the results of both of these experiments, by mixing incineration ash such as paper sludge, which is difficult to dispose of, with manure and stirring it, it is possible to accelerate the dehydration of manure and accelerate its conversion into fertilizer or fuel. Moreover, since it can quickly deodorize, there is no secondary pollution caused by bad odors, and there are no problems even if this type of treatment is performed in a place near a residential area. Therefore, it is possible to treat excrement and urine at the same time as incineration ash, which is effective. Furthermore, since dehydration is carried out quickly, there are almost no maggots, which occur in large quantities when natural dehydration occurs, and it is hygienic.

As an embodiment of the present invention, it is conceivable that the above-mentioned sludge is mixed with the above-mentioned incineration ash, stirred, and then subjected to a dehydrator such as a vacuum dehydrator 4. In this case, it is easily understood from the first experimental results that there is almost no clogging of the dehydrator.

Incidentally, in the above experiment, incineration ash of paper manufacturing sludge was used.
In addition, coal incineration ash, such as gun o, 3o%, Na 0.99%, Ca 2.03%, Fe1o, s7%, 5
Contains 12.63 parts of 102, 2.80 parts of Al, strong
The amount of sincerity + moisture is 46.2%, and from X-ray diffraction it is 5102%.
, those where the presence of CaCO3 is considered, and urban sewage sludge such as Mg 0.89%, Na 1.46%%C
24.67% a, 3.32% Fe, 5in
CaCO
3 is thought to exist, incineration ash of municipal garbage,
It has been found that incinerated ash, such as livestock manure, can be used in a similar manner. Further, although pig manure was used in the second experiment, other materials such as chicken manure, cow manure, human manure, or concentrates thereof can also be applied.

Patent applicant Takeshi 1) Mutsumi

Claims (1)

[Claims] (11. A sludge treatment method characterized by mixing incineration ash with sludge and stirring.