JPH03131398A - Sludge treatment apparatus - Google Patents

Abstract

PURPOSE:To improve overall treatment efficiencies and to minimize influence on a local environment by oxidizing and removing harmful substances and malodorous components contained in the moisture, i.e., vapor, in feed sludge having been decomposed by heat in a dryer by means of a vapor treatment apparatus without causing condensation of said moisture. CONSTITUTION:Feed sludge 1 is heated at a dryer 2 to vaporize the moisture therein, whereby the dried sludge is discharged from said dryer 2, while the moisture which is separated by heat from the sludge is sent, in the form of vapor 3, to a vapor treatment apparatus 10 by means of a blower 4, wherein, at first, harmful substances and malodorous components, etc., in the vapor are heated up to predetermined temperatures high enough to cause combustion under the action of catalyst by means of a heater 5. And at a catalytic combustion device 6, the harmful substances and malodorous components, etc., in the vapor are caused to burn and are oxidized at relatively low temperatures by the action of catalyst, whereby they are turned to carbon dioxide, water, etc., which can be vented to atmosphere. Consequently, as a whole, sludge treatment efficiencies can be improved, thereby preventing a bad influence on a local environment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a sludge treatment device for treating sludge discharged in sewage treatment, human waste treatment, industrial waste treatment, etc.

(Prior art) Figure 2 is a flow sheet showing a conventional sludge treatment method.
A dryer 2 that concentrates and dries the sludge without adding flocculants (inorganic and polymeric flocculants), and a dryer 2 that cools the water (evaporated steam) 3 heated and separated from the supplied sludge by this dryer with cooling water. , a condenser 7 for condensation, and a blower 8 for discharging non-condensable gas that is not condensed in the condenser.

The sludge supplied from the front-stage treatment system is heated in a dryer to evaporate its water content and become dried sludge, which is then discharged from the dry inorganic system.

On the other hand, the water heated and separated from the sludge is condensed again in the condenser and sent to biological treatment to treat the organic components contained therein.

(Problem to be solved by the invention) In conventional treatment methods, in order to discharge condensed water as it is,
Since the discharge standards cannot be met, the condensed water is sent to biological treatment. This poses a problem, such as an increase in the overall load, even in the case of a sewage treatment plant where the entire treatment system includes biological treatment. In particular, this becomes a big problem when treating sludge containing a large amount of ammonia as a whole. Furthermore, when biological treatment is not available, such as in the case of industrial waste treatment, treatment of this condensed water becomes a big problem.

In addition, non-condensable gas contains odor components, and releasing it directly into the atmosphere may cause complaints from residents, depending on the location where the sludge treatment equipment is installed. .

The present invention was made to solve these problems, and by providing an evaporative steam treatment device, the evaporative steam from the dryer can be released into the atmosphere without being condensed again. The purpose of the treatment is to increase the overall treatment efficiency and to minimize the impact on the local environment.

[Structure of the invention]

(Means for Solving the Problems) The sludge treatment method according to the present invention oxidizes evaporated steam from a dryer without condensing it again, so that it can be released into the atmosphere.

(Function) In the sludge treatment method of the present invention, the evaporated steam from the dryer is sent to the evaporative steam treatment device on the floor without being condensed again, and harmful substances and odor components related to organic matter in the evaporated steam are oxidized. , carbon dioxide, water, etc., and process it into a state that can be released into the atmosphere.

(Example) The present invention will now be described using an example shown in FIG.

FIG. 1 is a flow sheet showing the sludge treatment method of the present invention. This sludge treatment method concentrates and dries the sludge 1 supplied from the front-stage treatment system without adding any flocculants (inorganic or polymeric flocculants). a dryer 2, a blower 4 that directly sends the water (evaporated steam) 3 heated and separated from the sludge 1 supplied by the dryer 2 to the evaporative steam treatment device 10, and a heater that heats the evaporated steam to a predetermined temperature. 5 and the action of the catalyst, the harmful substances and odor components in the evaporated steam are burned.

It consists of an evaporative steam processing device having a catalytic combustor 6 that can be released into the atmosphere.

The sludge supplied from the pre-treatment system is heated in the dryer to evaporate its water content and become dried sludge, which is discharged from the dryer. On the other hand, the water that has been heated and separated from the sludge is sent to the evaporative steam treatment device by a blower while remaining in the form of evaporated steam. In the evaporative steam treatment device, first, a heater heats the evaporated steam to a predetermined temperature at which harmful substances, odor components, etc., can be combusted by the action of a catalyst. and,
In a catalytic combustor, the action of a catalyst combusts and oxidizes harmful substances and odor components in evaporated steam at relatively low temperatures, converting them into carbon dioxide and water, which can be released into the atmosphere.

As a result, there is no need to return the water separated from the supplied sludge by the action of the dryer to water as condensed water for treatment, and there is no need to send the water to biological treatment as condensed water. Sludge treatment efficiency can be increased. Furthermore, there is no need to worry about the presence of odor components in the non-condensable gas, which may adversely affect the local environment.

〔Effect of the invention〕

As explained above, the present invention eliminates the need to treat the water separated from the supplied sludge by the action of the dryer, convert it into water as condensed water, and send it to biological treatment. It can increase efficiency. Furthermore, there is an effect that there is no need to worry about the harmful effects of odor components in the non-condensable gas on the local environment.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet of an l'i mud treatment and egg treatment apparatus showing an embodiment of the present invention, and FIG. 2 is a flow sheet 1 of a conventional lll mud treatment apparatus.

Claims (1)

[Claims] 1. A dryer that concentrates and dries supplied sludge without adding a flocculant, and a dryer that removes harmful substances and odor components contained in the water (evaporated vapor) in the supplied sludge that is heated and separated by this dryer. A sludge treatment device comprising: an evaporative vapor treatment device that removes evaporative vapor by oxidizing it without condensing it; and a device for releasing the evaporative vapor treated by the evaporative vapor treatment device into the atmosphere. 2. The sludge treatment apparatus according to claim 1, wherein the dryer is a centrifugal thin film dryer. 3. The sludge treatment device according to claim 1, wherein the evaporative steam treatment device is an evaporative steam treatment device that removes harmful substances and odor components in the evaporated steam by burning them. 4. Claim 1, wherein the evaporated steam treatment device comprises a heater that further heats the evaporated steam, and a combustor that catalytically burns odor components in the evaporated steam heated by the heater. sludge treatment equipment.