JPS61161200A - Treatment of night soil - Google Patents

Abstract

PURPOSE:To remove the contaminants contained in concd. night soil by adding humic acid to the concd. night soil freed of deposits, agitating at specified pH, and separating the night soil by sedimentation into a separated liq. and separated sludge. CONSTITUTION:To concd. night soil freed of deposits, 0.1-10wt% humic acid is added, and agitated and mixed at 3-5pH. The mixture is separated by sedimentation into a separated liq. and separated sludge. Namely, a chemical agent for decreasing the COD in the night soil is not used in this case, and the use of an expensive oxidizing agent can be dispensed with by adopting colloidal sedimentation. Consequently, the COD substances are economically removed with the inexpensive humic acid. Moreover, the deposited and separated contaminants can be used as excellent fertilizer and soil improving agent.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: The present invention relates to a method for treating human waste, and more particularly to a method for treating concentrated human waste using humic acid.

Conventional technology: Conventionally, concentrated human waste has been treated by biological purification after reducing organic substances using iron-based flocculants such as fibers and paper pieces.

Problems solved by Hatsu EJIK According to the former (biological method), not only is it necessary to use water for diluting many fish, but the capacity of the treatment tank is 3 times the amount of input per day.
0 times more required, 1m! There were disadvantages of investment, luck @ yellow, and large site area.

On the other hand, in the case of the latter (chemical treatment + biological treatment), the required chemicals must be used at approximately 1 to 3% of the treated urine, and the effectiveness is only approximately 30 to 70% in terms of COD removal rate. ,
It wasn't economical.

Means for solving the problem: In the present invention, concentrated human urine is purified by adding an alkali salt of humic acid or amino acid. At this time, if an inorganic flocculant such as ferric chloride or aluminum sulfate is used in combination, the purification time can be further shortened.

The appropriate amount of humic acid to use fi - about 0.1 to 10% of human urine. If it is less than 0.1%, the effect is not sufficient, and even if it is used more than 10%, the young fruit will hardly change, making it economical. Not on point. Further, it is preferable that the pH of the mixture to which humic acid is added is a weak acidity of about 3 to 5. Further, if the mixture is stirred for about 0.5 to 4 hours, the reaction will proceed sufficiently.

Function: Humic acid is a general term for amorphous acidic organic substances that are alkali-soluble, acid-insoluble, brownish or black, and are contained in grass charcoal and lignite with a low degree of coalification, broken seabed soil, etc. The acidity is due to the presence of carboxyl groups and phenol groups, and the chemical equivalent per acid is often 300 to 400 carbon 50.
-65%, hydrogen 4-6%, and the remainder is mostly oxygen, but may also contain nitrogen or iota depending on the source. The humic acid referred to in the present invention includes all humic acids regardless of their origin.

Next, when 0.1 to 10 parts by weight of humic acid is added to 100 parts by weight of excreted human waste (expressed as 0.1 to 10%), as shown in No. 11, 0.1 to 10 parts by weight of humic acid is added. % addition, the COD already decreases, and up to the addition of 1#, C
OD continues to decline. Using humic acid in an amount of 10% or more is not preferable for economical reasons since it has little effect on increase. Furthermore, the COυ-lowering effect of humic acid is due to the flocculant (
In the solid line of 1st fc, ferric chloride is used, but it increases when used in combination with other materials (aluminum sulfate, etc.).

If the pnFi of the mixed suspension is kept between 3 and 5, there will be virtually no difference in the drop in COD, but if it is 5 or more, the drop in COD will be small, which is not preferable. Furthermore, if the pH is lower than the acidity, problems such as acid-based corrosion will increase.

Based on the chemical structure described above, humic acid is considered to be an anion flocculant or a cation exchange resin, and is thought to combine with amino groups and other cationic functional groups in human urine to form large particles and precipitate. Also, what is disappointing about put-3-5 is that, for example, if a protein has a %1oHIC smaller than its isoelectric point,
This is presumed to be a condition for cationizing the amino group of human waste in the same way as cationizing the amino group of human waste. In contrast to the action of humic acid, the inorganic flocculant has the effect of neutralizing and settling particles that have reached a negative 'Tjt# in the suspension. Naturally, the neutralization reaction between humic acid and ferric cations and aluminum cations also causes condensation of both, and these complex neutralization reactions at the colloidal level eventually promote precipitation.

At the same time as adding humic acid, add a flocculant, especially an inorganic flocculant such as ferric chloride, 0.3 to 0.5% by weight based on the prefecture's concentrated human waste.
Addition of aluminum sulfate facilitates sedimentation and separation of pollutants (Table 1). Furthermore, the use of multiple shrimp is generally not economical.Also, diluting the removed human waste with water has the advantage of making it easier to stir and transport through pipes, but the purification efficiency, that is, the separated water The amount of total human urine transferred increases.

For this reason, it is not preferable to increase the dilution ratio to 5 times or more. It should be noted that commercially available humic acids include those in acid form and those in sodium salt form, but it goes without saying that acid form is preferable since the pH used is 3 to 5.

Table 1 Note (1) Used in CH-011 manufactured by Chill Night Co., Ltd.

(2) Manganese method (JIS KO102Φ17)K
Yes.

Example: @1 In Figure 1, blocked concentrated human waste is taken from A, humic acid is taken from humic acid supply tank 1, dilute sulfuric acid is taken from acid storage tank 3, and if necessary, flocculant aqueous solution is taken from flocculant storage tank 4. From there, the flow is adjusted to a desired mixing ratio and supplied to the mixing tank 2 with an agitator. The suspension coming out of 2 reaches II+ separator 5, where it is separated into separated liquid B and separated sludge C.

Next, in FIG. 2, in the mixing tank 2, only the raw concentrated human urine and humic acid are mixed by stirring with the pH adjusted with the acid from the acid storage tank 3, and separated into a supernatant liquid and pollutants in a minute 1lII humidity 5, A part of the pollutant is returned to the mixing tank 2, the other part is collected outside, and the upper surface separated liquid is sent to the aggregation tank 7 with a stirrer. From storage tank 3, if necessary'#
A collection agent is fed from the flocculant storage tank 4 while adjusting the flow area to promote flocculation, and in the second separation 4ζ, supernatant separated water B2 and separated sludge C are
Separate into 2. The method of FIG. 2 requires a somewhat more complicated apparatus, but the separation is 2.7 and 1/2 times higher.

Effects of the Invention As mentioned above, the present invention lowers the COD of concentrated human urine. Therefore, by employing colloidal precipitation (colloidal neutralization) without using chemical oxidizing agents, the need for expensive oxidizing agents is eliminated, and inexpensive humic acids (actually acid-insoluble 7 (can be used even if it contains mus substances), CO
From a cost perspective, it is characterized by the fact that it precipitates and removes substance D.
Furthermore, the number of young fruits can be increased by using a flocculant such as iron chloride or aluminum sulfate. Furthermore, the precipitated and separated pollutants can be used as fertilizer and soil damage improver, so the economical 7-hour effect is to kill two birds with one stone.

[Brief explanation of drawings]

FIGS. 1 and 2 are flowcharts showing an outline of the apparatus according to the embodiment of the present invention. 1... Humic acid supply tank, 2... Mixing tank ζ 3...
Acid storage tank, 4... Coagulant storage tank, 5... Separator, 6...
- pH meter, 7... agglomeration tank, 8... second separator. Applicant: Riri I’”-1 Agent
Yoshi Nakamura -, l・, -5-=, Kaori 1
− is

Claims (1)

[Claims] 1. Adding 0.1 to 10% of humic acid to concentrated human urine after sediment removal.
A method for removing pollutants contained in concentrated night soil by adding % by weight and stirring and mixing at a pH of 3 to 5, followed by sedimentation separation to produce a separated liquid and separated sludge. 2. The method according to claim 1, wherein a flocculant is added together with humic acid. 3 The flocculant is one or more substances selected from ferric chloride and aluminum sulfate, and the amount used is 0.3 of the amount of concentrated human urine.
3. The method of claim 2, wherein the amount is 0.5% by weight.