JPS58185491A - Manufacture of powdery fertilizer from excrements - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a highly effective powdered fertilizer from human waste.

Human waste treatment technology is progressing rapidly and the level of environmental pollution is decreasing, but it is impossible to make treated water extremely pure, so if we want to achieve ideal environmental conservation, The only option is to adopt a closed system that does not discharge treated water. On the other hand, when human waste is viewed as a fertilizer resource rich in nitrogen and phosphorus, the current treatment system that requires denitrification and dephosphorization is a waste of resources and energy. Therefore, it is most desirable to reduce human waste as fertilizer, but an effective treatment method has not yet been developed.

This invention was made in view of the above-mentioned circumstances, and by aging raw human waste and then drying it, it is possible to effectively utilize the fertilizer components in raw human urine without releasing treated water to the outside. The purpose of the present invention is to provide a method for producing highly effective powdered fertilizer.

Next, an example of the steps of the method of this invention will be explained with reference to the drawings. Raw human waste is first subjected to pretreatment to remove impurities in a screen 1, and then introduced into an aeration tank 2. This aeration tank 2 is structurally the same as that used in the normal activated sludge treatment process, but in this invention method, the human waste is aged by fermentation while supplying air at 2°C. It is used for deodorization and deodorization. This ripening is one of the most important steps, as it breaks down the high molecular weight substances contained in raw human urine into low molecular weight substances and converts them into a form that is easily ingested by plants. During this aging process, the N component becomes NH, -N, and the pH #'i rises to around 8.0.

Aging in the aeration tank 2 takes 1 to 8 days, although it varies depending on conditions such as temperature.

Aeration tank 2t - The discharged liquid is led to the settling tank 3, where the sludge is separated by sedimentation, a part of this sludge is returned to the aeration tank 2 as return sludge, and the remainder is separated as surplus sludge. be done. Further, the supernatant liquid is supplied to the next multiphase tank 4 and mixed with excess sludge and H and So. The addition of H, 804 is to fix NH, -N = i contained in aged human urine, and by adjusting the pH to around 7.0, most of NH, -H is converted to (NH,) , 804.

The mixed liquid obtained in the mixing tank 4 is dried in a spray drying tank 5. As is well known, this spray drying method 81 is capable of rapidly drying a slurry-like liquid taken out from the mixing tank 4 by spraying it and bringing it into contact with hot air. It is possible to use conventional products of the same type as those used in the production of dry powder foods and the like.

From this spray drying flkK, the liquid taken out from the multiphase tank 4 becomes a dry powder with a particle size of one foot, that is, a powdered fertilizer. The obtained powdered fertilizer has already been deodorized during the aging process in Air-2, so it does not have a strong odor, and since it is heat sterilized by contact with hot air during spray drying, it is hygienic. There is no real problem with l. Moreover, NH generated during ripening.

-N becomes ammonium sulfate by adding H,804, so it is not volatilized by heating during spray drying and is contained as is in the powder fertilizer. That is, the powdered fertilizer taken out from the spray dryer 5 contains almost no loss of the fertilizer components contained in raw human waste, is hygienic, has no bad odor, and can be handled in the same way as ordinary chemical fertilizers. . If the powder form is not desirable due to handling convenience or sustainability after being sprayed on the field, it is also possible to form 41 grains into a belent shape using a normal granulator.

According to the results of applying the powdered fertilizer obtained in this way to various plants and examining its effects, the rate of increase in total wrinkles of plants was higher than when applying fresh human urine. It was confirmed that the effect appeared rapidly after 1α of fertilization.

Furthermore, in the above example, a spray dryer was used as the dryer, but in the case of a spray dryer, there is a risk that foreign matter may clog the nozzle, so in order to perform the process stably,
It is a good idea to set up a process to remove impurities before drying. Therefore, the dryer may be replaced with another known dryer that may be contaminated with foreign substances, such as a rotary kiln type dryer. It is also possible to combine two or more dryers.

In addition, the method of drying by applying heat may destroy some of the fertilizing ingredients, so from the perspective of protecting the ingredients,
Lyophilization is optimal. According to Freezing 11i and Drying, there is no problem of contamination with foreign substances.

In addition, in the above-mentioned example, only the maturing by aerobic fermentation using an aeration tank as a maturing tank was described, but the maturing by anaerobic fermentation may also be used.

As described above, according to this invention, raw human waste is turned into a dry powder fertilizer that is difficult to handle, and is aged in the process, which solves the problem of raw human waste disposal and resource reuse. The problem can be partially solved.

[Brief explanation of the drawing]

The figure shows sheets 70 to 70 showing an example of the steps of the method of this invention. 1... Screen, 2... Aeration →, 3... Sedimentation tank, 4... Mixing tank, 5... Spray dryer.

Claims (2)

[Claims] (1) The raw human waste is stored in a fermentation tank, fermented in this aging tank to age the raw human waste, and #t- is added to the aged human waste to produce NH, - in the aged human urine.
A method for producing powdered fertilizer from raw human waste, characterized by N-fixing and then drying. (2) A method for producing powder fertilizer from raw human waste according to claim 1, characterized in that a part of sludge is separated from the aged human waste and returned to the aeration tank.