KR940011824B1 - Waste water treatment system - Google Patents

Abstract

The waste water sprayed by a nozzle (2) installed on top of spray/dry apparatus (4) is dryed by hot air (B) at 150 deg.C and ammonium sulfate that is materials of fertilizer is recovered as solid state (D). The gas of low temperature (150 deg.C) that ammonium sulfate in waste water is perfectly removed is decomposed in an incinerator at 482 deg.C and changed to a hot gas. The hot gas is passed into a thermal exchanging machine (8) and recovered heat capacity is used as other energy source.

Description

Wastewater Treatment System in Synthetic Resin Manufacturing

1 is an exemplary embodiment according to the present invention.

2 is a flow chart according to the wastewater treatment according to the present invention.

* Explanation of symbols for main parts of the drawings

1: waste water tank 2: nozzle

3: hot air generator 4: spray drying apparatus

5: bag filter 6: incinerator

7: year 8: heat exchanger

9: gas cleaner 10: operation damper

A: Pump means

The present invention relates to a treatment system for wastewater (containing ammonium sulfate, pyridin, etc.) generated during the manufacture of synthetic resins. In particular, the present invention relates to ammonium sulfate, a comparative raw material, in the process of safely treating wastewater to prevent contamination of the natural environment. The present invention relates to a wastewater treatment system generated during the production of a synthetic resin developed to recover a solidified state and to recover and recycle residual heat of waste gas.

In general, wastewater generated during the production of synthetic resin is mixed with ammonium sulfate (about 35%), paradine (about 0.5%), water (64.5%), etc. In the conventional case, the wastewater treatment method is a direct flame Incineration treatment by is used.

However, such wastewater treatment requires an incinerator that maintains a high temperature (about 780 ° C) for the decomposition of ammonium sulfate in the wastewater, resulting in economic losses and sulfur oxides in the exhaust gases to the atmosphere. It contains (SO _x ) and nitrogen oxides (NO _x ), which are the main causes of air pollution.

In addition, the wastewater treatment was required to recover the ammonium sulfate, a comparative material contained therein.

In order to solve the above problems, the present invention injects wastewater, and treats the wastewater to be evaporated to dryness at a low temperature by hot air at about 150 ° C., and the ammonium sulfate contained in the wastewater in the process. While completely recovering pyridin while separating and recovering it in a solidified state, it is possible to recover and recycle heat remaining in high-temperature waste gas, which will be described in detail with reference to the accompanying drawings.

Wastewater tank (1) in which wastewater generated in the synthetic resin manufacturing process is agitated in a collecting state, and pump means (A) is pumped into the wastewater supply path by the pumping force and injected into the nozzle (2), and the low temperature in the hot air generator (3). A spray drying apparatus 4 for separating the ammonium sulfate contained in the waste water into a solidified state by heating and evaporating the waste water injected by hot air in a state of (130-150 ° C.), and remaining in the gas derived from the spray drying apparatus. A bag filter (5) for completely filtering solid ammonium sulfate solids, an incinerator (6) for completely burning and decomposing pyridines which are induced by gas in the bag filter (5), and an exhaust port of the incinerator (6) It is installed in communication with the flue (7) toward the heat exchanger (8) and the gas cleaner (9), which is a waste heat recovery means sequentially interlocked with the flue (7) is installed in communication with the flue (7) on one side of the incinerator (6), Manipulated by manual control It consists of the operation damper (10). Here, the heating means (B) (B1) and the fuel and combustion air supply means (C) (C1) are attached to the hot air generator (3) and the incinerator (6).

In addition, the ammonium sulfate in the solidified state separated by the spray drying apparatus 4 and the bag filter 5 is collected by dropping it into a recovery means (using a conveyor or the like) D. The wastewater treatment system of the present invention is controlled by the control means (E). Reference numeral F is a stirring means consisting of a motor and a fan.

When explaining the embodiment of the present invention in detail as follows.

In order to treat the wastewater generated in the synthetic resin manufacturing process, first, the control signal sent out from the system control means (E) while collecting the wastewater tank (1) of the system according to the present invention and agitated as the stirring means (F) When the system is operated by the waste water, the waste water in the waste water tank 1 is guided to the nozzle 2 positioned above the spray drying apparatus 4 along the supply path by the pumping action of the pump means A and spray dried. It is injected into the apparatus 4, where hot air in a low temperature (150 ° C.) state is spray-dried by the operation of the heating means B, which is operated by receiving fuel and combustion air from the fuel and combustion air supply means C. 4) it is induced to maintain a low temperature state, and the waste water sprayed into the spray drying apparatus 4 in this state is evaporated to dryness, while ammonium sulfate, which is a raw material of the fertilizer contained, is separated into a solidified spray drying apparatus (4). Through the exit of Is dropped to the collection means (D) is recovered.

Subsequently, the low temperature gas exhausted from the spray drying apparatus 4 (a small amount of solid ammonium sulfate remains) is introduced into the filter dust collector 5, which is in communication, to completely filter the ammonium sulfate remaining in the hot gas. It will fall to collect | recovery means D, and it will collect | recover.

In addition, in the ammonium sulfate recovery process as described above, the low-temperature gas from which ammonium sulfate is completely removed is led to the inside of the incinerator 6 along the gas flow path, and at this time, fuel and combustion air are supplied to the upper side of the incinerator 6. By operating the heating means B1 connected to the means C1, the inside of the incinerator 6 maintains pyrodine pyrolysis temperature (about 482 ° C) or more, and the gas passes through the interior of this state. The pyridine remaining in the gas is completely decomposed by the pyrolysis temperature and is exhausted with a high amount of heat toward the operation damper 10 installed toward the exhaust port of the incinerator 6.

Here, the gas exhausted toward the operation damper 10 is in a state of completely removing ammonium sulfate and pyridine while sequentially passing through the spray drying apparatus 4, the bag filter 5, and the incinerator 6.

On the other hand, the exhaust port of the incinerator (6) is equipped with an operation damper 10 which is operated by electrical control, so that when the waste heat is to be recovered by the operator's selective operation, the operation damper does not discharge to the flue (7) By operating (10) to cut off between the exhaust port of the incinerator (6) and the flue (7), the high temperature gas passing through the incinerator (6) is led to the heat exchanger (8), and passes through the heat exchanger (8). One gas is filtered through a gas cleaner (9) and released into the atmosphere through the flue (7).

At this time, the amount of heat recovered by the hot gas passing through the heat exchanger 8 can be applied to hot water (heating) or other industrial fields as an energy source, and the operation damper 10 is selected by the operator. When the heat exchanger 8 is operated by timely control, that is, when the waste heat recovery is not required, the operation damper 10 is opened so that the gas discharged from the exhaust port side of the incinerator 6 passes through the operation damper 10. It will be released into the atmosphere through year (7).

As described above, in the present invention, in treating wastewater generated in a synthetic resin manufacturing process, the ammonium sulfate contained in the wastewater is recovered in a solidified state in an ammonium sulfate recovery process consisting of a spray dryer and a bag filter, In addition, by treating pyrodine in the incinerator with pyrolysis completely, it can be used for separate purposes by recovering the residual heat of waste gas, and it can recover and use ammonium sulfate as a fertilizer as well as waste water treatment. The system is operated with the decomposition temperature of the incinerator at low temperature, so that economical effects can be obtained and the natural environmental pollution factors caused by wastewater treatment can be eliminated.

Claims (1)

Wastewater tank (1) in which wastewater generated in the synthetic resin manufacturing process is agitated in a collecting state, and wastewater is guided to the supply path by the pumping force of the pump means (A), injected into the nozzle (2), and the low temperature in the hot air generator (3). The spray drying apparatus 4 which separates the ammonium sulfate contained in the waste water into the solidified state by heating and evaporating the wastewater injected by the hot air of the state, and the ammonium sulfate remaining in the gas derived from the spray drying apparatus is completely filtered. The bag filter 5 to be separated, the incinerator 6 to completely burn and decompose the remaining paradine induced by gas in the bag filter 5, and the flue 7 toward the exhaust port of the incinerator 6; The heat exchanger 8 and the gas cleaner 9, which are installed in communication and sequentially interlocked with each other, are connected to the flue 7 on one side of the exhaust side of the incinerator 6, and are operated by electrical control. Operation Damper (10) Yirueojyeoseo waste water treatment system that occur during manufacturing the synthetic resin according to claim to become.