JPS601075B2 - Quantitative supply method of screen scum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for determining screen scum, which quantitatively supplies screen scum scraped and recovered from a dust remover in a sewage treatment plant, etc. to subsequent processing equipment, such as a dehydrator. The present invention relates to a flow supply method.

The amount of screen scum collected from dust removers at sewage treatment plants and the like is not necessarily constant, and there are times when a large amount is collected and times when no amount is collected, and the amount collected is indeterminate. If this is directly supplied to a downstream processing facility, such as a dehydrator, via a conveyor or other conveyance means, the dehydrator will overshoot its processing capacity if it is supplied with more than the set amount of screen residue, i.e., more than its dewatering capacity, and smooth operation will not be possible. This may cause problems such as overflow and scattering of screen debris around the screen. In order to completely prevent this, the screen residue collected from the dust remover is temporarily stored in a hopper, and is supplied in fixed quantities to the downstream processing equipment using a quantitative supply device. In the secondary quantitative feeding device, water is supplied into a hopper, and the screen waste is scraped up and fed in fixed amounts at a time while being sorted.

When this water supply reaches a certain level, the water supply is stopped, and the water level is gradually lowered to raise screen debris on the sliding surface (a single plate-shaped apron surface), so that the water can be drained. Immediately after the boiling, a large amount of hot water is stirred up, but the amount of hot water gradually decreases, and it is not necessarily a constant supply. The present invention has been made in view of this, and includes a screen in a hopper into which the screen scum is fed, and a scraping device that scrapes up the screen scum that has been collected by the screen and quantitatively supplies it to the subsequent processing equipment. At the same time, water is continuously supplied into the hopper from the front side of the screen and drained from the rear side of the screen, and the water level of the water supply and drainage is gradually lowered to generate a water flow inside the hopper, thereby quantitatively scattering screen residue on the screen surface. The summary of what was done as prompted will be explained below based on the illustrated embodiment.

In the figure, 1 is a receiving hopper in which a predetermined amount of screen waste is stored, and a screen 2 is installed within this hopper at a certain angle from the bottom to the top of the hopper. 1 is shaped so that even if screen scum descends toward the bottom of the hopper, it can be scraped up reliably by the screen and scraper device, and an indefinite amount of screen scum collected from the top of the hopper is introduced and water is supplied 3. A drain port 4 is provided on the rear side of the screen so that water passes through the screen at the bottom, and this water supply and drainage is performed continuously or the water level gradually decreases.

The screen 2 has a large number of angles 2a lined up at required intervals so that the screen dust pool forms an inverted triangle, and slides along the screen 2 to quantitatively scrape the screen dust collected on the screen surface. A scraping device 5 for frying is provided.

The screen separates the screen storage tank of the receiving hopper from the sewage outflow tank so that the screen scum does not flow out, and also makes it easier to scrape off the screen scum by encouraging the screen scum and allowing the rake to pass in front of it. The screen scum scraping device has two endless chains with rakes at regular intervals, and is a device that continuously scrapes up the screen scum collected on the screen surface. Consists of wipers.

Then, the hopper is supplied with water and filled with a predetermined amount of water, and a supply means 6 such as a conveyor or a dumper is used to feed the screen waste collected by the dust remover.

This may be done by supplying a certain amount of water into the hopper after introducing the screen waste. When water is supplied after feeding the screen waste, the drain valve is first closed, and when the water supply reaches a certain amount, the drain valve is opened while water is being supplied to drain water, and the scraping device 5 is activated. As a result, even if the screen debris has various shapes, sizes, and properties, it is loosened by the water in this hopper, and a water flow is generated in the hopper in the water supply and drainage as it passes through the screen. This screen scum is gradually brought to the screen surface by the action of water flow and becomes adsorbed and collected on the screen surface. At this time, the scraping device is operated, so that the screen scum is scraped up in fixed quantities, and the screen scum is also slurried in water by the rake of the scraper, and the sludge is separated. In this way, the screen dregs are successively scraped up in fixed amounts, and when most of the screen dregs are discharged, the water level drops, and when it reaches a certain low water level, the rapid drain pipe 7 is also opened to rapidly drain the screen dregs. The sludge that has settled at the bottom of the hopper is separated by washing, and the sludge that has settled at the bottom of the hopper is drained as well. In this way, when the inside of the hopper is empty, the drain pipe is closed, and the next screen scum is fed and supplied in the same way, and in this way, the screen scum is continuously supplied in fixed amounts to the downstream processing equipment. It is something.

According to the present invention, the screen scum introduced into a hopper equipped with a screen and a scraping device is loosened by continuous water supply and drainage, and the water level is gradually lowered so that it is captured on the screen surface and scraped. Because it is fried, it is possible to supply a fixed amount reliably and in a simple way.This makes it possible to supply a fixed amount of screen waste, which has been difficult in the past, even with various shapes, sizes, properties, and miscellaneous screen scraps. The treatment of waste, such as dehydration and incineration, can now be operated without trouble, and there is the advantage that screen waste can be quantitatively and efficiently supplied to subsequent processing equipment.

[Brief explanation of the drawing]

FIG. 1 is a sectional view, FIG. 2 is a plan view, and FIG. 3 is an explanatory diagram of the screen. 1...Hopper, 2...Screen, 3...Water supply, 4
... drain pipe, 5... raking device, 6... supply means,
7...Rapid drain pipe. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A hopper into which screen scum is input and supplied is equipped with a screen and a scraping device that scrapes up the screen scum caught on the screen and quantitatively supplies it to the post-processing equipment. The screen sludge is characterized in that water is supplied to the hopper, water is drained from the rear side of the screen, and the water level of the water supply and drainage is gradually lowered to generate running water in the hopper, so that the screen scum is quantitatively captured on the screen surface. Quantitative supply method.