JPS5889995A - Treatment for night soil - Google Patents

Abstract

PURPOSE:To improve the workability in a night soil treatment by subjecting a liquid mixture after an aerating treatment of high concn. org. waste water to a centrifugal filtration treatment only for the specified time, adding flocculating agents to the separated liquid thereof then subjecting the liquid to centrifugal sepn. only for the specified time. CONSTITUTION:After night soil is charged into a temporally receiving tank 1 and is removed of sand, etc. by a settling treatment, the night soil is fed into a storage tank 2. From the tank 2, the night soil is pumped to a screen 3 by which extraneous materials are removed. Said pump is operated only for the specified time. The night soil is further supplied to an aerating tank 4, and the liquid mixture after the aeration is fed to a centrifugal filter 5, by which the greater part of solids are separated. Polymer flocculating agents are added to the separated liquid after the sepn. to flocculate the solids; thereafter, the SS are removed with a decanter type centrifugal separator 6. If the filter 5 and the separator 6 are both operated only for the specified time of 9-17hr, workability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a human waste processing method that uses a centrifugal filtration step and a centrifugal separation step and performs these operations only during a certain period of time, for example, during the daytime.

As a conventional human waste treatment method, for example, the treatment method shown in FIG. 1 has been implemented. At treatment plants implementing such methods, it is important to check whether the treatment in the final sedimentation tank is being carried out properly. Particularly in small-scale treatment plants, when the quality of discharged water deteriorated during the night, no countermeasures were taken until the morning, resulting in poor quality treated water being discharged and treatment functions being impaired.

This invention solves the above-mentioned drawbacks and uses a centrifugal P
The process is effectively carried out using a filtration process and a centrifugation process,
Moreover, it is an object of the present invention to provide a human waste disposal method in which these operations are performed for a certain period of time, for example, only during the daytime, in order to improve the workability of human waste disposal.

An embodiment of the present invention will be described below with reference to FIGS. m2 to 6.

As shown in Figure I42, the process of one embodiment of this invention includes the following steps:
A temporary storage tank 1 that receives human waste from a vacuum car and removes sand, etc. from the human waste, a storage tank 2 that stores the human waste from which sand and other substances have been removed, and removes impurities in the human waste from this storage tank 2. an aeration tank 4 for aerating the human waste from which impurities have been removed, a centrifugal iF2 filter 5 for passing the aerated human waste through a centrifugal P, and a screw decanter type centrifugal separator for further centrifugal separation. Machine 6 is located.

Next, the operation of this invention will be explained. Human waste to be treated is first put into a temporary storage tank 1, and after sand and the like are removed by sedimentation, it is sent to a storage tank 2.

Thereafter, the storage tank 2 is sent to a screen 3 by a pump (not shown) to remove impurities.
operates only during certain hours (for example, from 9:00 to 17:00 only during the day).

Next, the human waste from which impurities have been removed is sent to @Kihino 4, and -
Receive air treatment (aeration treatment process). This aeration process may be performed in just one aeration tank 4, but may also include denitrification treatment as shown in the third aeration process.

Furthermore, in this aeration step, as shown in FIG. 5, a P material for bioadhesion may be filled into the @air tank 4 to form an adhesion-air tank.

Then, as shown in Fig. wL2, the mixed liquid from the aeration step is sent to the centrifugal filter 5, where it is centrifugally filtered (centrifugal filtration step) to separate most of the solids. Here, if we assume that the centrifugal f'3m machine 5 does not use such fine-grained P cloth and that it can pass through for a certain amount of 88 minutes, operation management will be very easy.And this centrifugal filtration process Gapong liquid (solid content) separated by
The microorganisms are returned to the aeration tank 4 to be inspected and aerated, but the microorganisms in the aeration tank 4 can be maintained by this return.

On the other hand, since the aliquot liquid separated in the centrifugation step contains a certain amount of SS (for example, several hundred IR9/43), a polymer flocculant is added and after flocculation, it is passed through a Tecanter type centrifuge 6. to remove SS (centrifugation step).

The centrifugal separator 6 to which the flocculated separated liquid is supplied should preferably be of a screw decanter type, but since the amount of solids is small and the amount of separated liquid is large, the pool of the centrifugal separator 6 should be made deep enough to drain the cake. It is best to operate with the outlet located very close to the axis, with low G (for example, 1000 G or less) and with a small differential speed.

Here, if the centrifuge 5 and the centrifuge 6 are operated only for a certain period of time (for example, from 9 o'clock to 17 o'clock), the workability is very good (and since their operating status can be constantly monitored, The human waste treatment condition can always be kept in good condition◎ Furthermore, since human waste is only brought in during the day, it can also be discharged only during the day, so there is no problem at all.

No. 61 shows a 70-sheet of another example, and is an example in which the inputting of human waste, the aeration process, and the operation of the centrifugal filter 5 were performed separately.

For example, the aeration is carried out continuously for 24 hours, the operation of the centrifuge 1 filtration machine 5 is carried out between 8 o'clock and 12 o'clock, and the am sludge separated here is drawn out to be returned to the aeration tank 4), while the separated liquid is a polymer flocculant. After adding, processing is performed using a centrifuge 6. After the return of the thickened sludge to the aeration tank 4 is completed, fresh human waste is added between 12:00 and 14:00.

Therefore, the input human waste is always aerated until the so-called extraction begins, so there is no possibility of short circuit.

In addition, the inside of the tank is concentrated before the human waste is added, and the microbial concentration is high, so it is easy to maintain the F/M ratio. Under these conditions, denitrification of the nitrate-nitrogen generated before the start of charging occurs actively. Nitrification has progressed by the time the input begins.

Incidentally, since the human waste is put in and taken out only during the daytime, the workability is good and the human waste disposal state can be monitored.

As described above, according to the human waste treatment method of the present invention, in addition to the aeration process, the human waste treatment is effectively carried out using the centrifugation step and the centrifugation step, and these operations are continued for a certain period of time, e.g. It is carried out only during the day, and the processing status can be monitored, improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing the steps of a conventional human waste treatment method, FIG. 2 is a flow sheet showing the steps of the method of the present invention, and FIGS. 3 to 6 are flow sheets showing other embodiments. 1... Temporary receiving tank, 2-φ storage tank, 3... Screen, 4-... Aeration tank, 5... Centrifugal filtration machine, 6... Centrifugal separator.

Claims (1)

[Claims] The aeration process involves aerating high-concentration organic wastewater such as underarms, and the mixed liquid from this aeration process is heated for a certain period of time to 1 c.
A method for treating human waste comprising a centrifugal f overtreatment step in which the centrifugal F overtreatment is carried out, and a centrifugation step in which a flocculant is added to the separated liquid from the centrifuged duck and then centrifuged in a decanter for a certain period of time. .