KR20040099519A - The dehydrated wastewater treatment system from food garbage using modulated a dissolved air floatation system and a electrical reaction apparatus - Google Patents

Abstract

PURPOSE: To provide a system for treating dehydrated wastewater generated from garbage, which is able to reduce an amount of wastewater to be flown into a sewage disposal tank and reduce soil contamination caused by the wastewater generated when burying the garbage, by a modulated dissolved air floatation practiced two times and a biological treatment. CONSTITUTION: The system comprises the steps of (a) separating wastewater from a highly concentrated garbage by a centrifugal dehydrator; (b) flowing the separated wastewater and a garbage supernatant generated from a composting process into a first pipe coagulator and a modulated dissolved air floatation tank in sequence to remove SS, BOD, COD therefrom, sending sludge and scum sludge in a lower portion of the tank to a storage tank and controlling the remaining treated water in an electrical reactor; (c) flowing the wastewater passing through the electric reactor into a second pipe coagulator and a modulated dissolved air floatation tank to remove the SS, BOD, COD therefrom, sending sludge to a sludge storage tank and flowing the remaining treated water into a sequential biological process; and (d) applying an anaerobic step, an aerobic step, an anoxic step and a precipitation step to the treated wastewater to simultaneously remove organic materials, nitrogen and phosphorous, sending the sludge to a first storage tank, a second storage tank and a sludge storage tank and flowing supertanant into a discharge tank.

Description

Food Waste Desorption Wastewater Treatment System Modularized Pressurized Flotation Separation System and Electric Reaction System

The present invention is a treatment system that utilizes a biological treatment process for agglomeration, flotation, and biological treatment of high-density wastewater generated from food waste by centrifugal dewatering and waste food desorbed from food waste and feed waste or composting.

In general, food waste or various wastes cannot be disposed of as they are, so that the desorption liquids can be separated, and then incinerated or recycled wastes can be separated and dried, and these dried wastes can be recycled as industrial resources. In particular, the food waste and the like is used for incineration or composting after separation of solids.

Since the food waste contains a lot of water, only the method of drying and incinerating the food waste could not evaporate or treat all of the wastewater contained in the food waste. Wastewater was discharged as it is, and there was a wastewater that caused pollution of the water by the discharged wastewater.

In addition, when the food waste is landfilled as it is, wastewater generated from the food waste is infiltrated into the ground as it is, there is a problem of lighting that contaminates the land together with groundwater contamination by leachate.

The present invention not only reduces the inflow load of the sewage treatment plant by treating the centrifugal dewatered food wastewater in two separate pressurized flotation and biological treatment, but also reduces the inflow load of the sewage treatment plant. The problem of discharge after partial treatment by dry incineration can be solved.

1 is a block diagram showing a system of an embodiment of the present invention.

<Description of Signs of Major Parts of Drawings>

1: sump tank

2: centrifugal dehydrator

3: flow adjustment tank

4: Primary Pipe Aggregator

5: primary float separator

6: flocculant tank

7: admixture tank

8: neutralizer tank

9: sludge storage tank

10: first storage tank

11: electric reaction device

12: second storage tank

13: chemical supply equipment

14: secondary pipe agglomerator

15: secondary flotation separator

16: third reservoir

17 biological treatment means

18: coagulation tank

19: cation tank

20: anion tank

21: dehydration means

22: discharge tank

In order to achieve the above object, the present invention comprises the steps of (a) centrifugal dehydration of food waste of high concentration; (b) by sequentially introducing the desorbed wastewater and the food waste desorbing liquid generated in the feed or composting process to the first pipe agglomerate and the pressure flotation separation tank to remove SS, BOD, COD and the sludge bottom and sludge sludge storage tank Sending the remaining treated water to an appropriate water quality for the secondary flotation separation through an electric reactor; (c) flowing the wastewater passed through the electric reactor back into the secondary pipe aggregator and the pressure flotation separation tank to remove SS, BOD and COD, and sending the sludge to the sludge storage tank, and introducing the remaining treated water into the next biological process; (d) The treated waste water is removed simultaneously with organic matter, nitrogen and phosphorus by applying anaerobic step, aerobic step, anoxic step, and precipitation step utilizing biological treatment, and the sludge is sent to the first storage tank, the second storage tank, and the sludge storage tank. Is a system configured to discharge into the discharge tank in connection with the sewage terminal treatment facility.

Hereinafter will be described in more detail the working state of the present invention configured as described above.

The high concentration of food wastewater containing large and small solids is dewatered through the centrifugal dehydrator 2 to remove the wastewater and transferred to the flow adjusting tank 3, and the food waste from which the wastewater is removed is transferred to the sludge fermentation copper.

In the flow rate adjusting tank 3, a constant flow rate is sent to the primary pipe agglomerator 4 so that the desorbed wastewater does not have an impact load, and is sequentially supplied from the coagulant tank 7, the neutralizer tank 8, and the admixture tank 6. The treatment agent and the waste water are mixed and agglomerated by turbulence in the primary pipe agglomerator 4 and transferred to the flotation separator 9. The flocculated floc is injured by 40 micron-sized microparticles and is injured through the corrugated inclined plate separator, and the injured sludge is collected by the skimmer and transferred to the sludge storage tank (9). The sludge is conveyed to the sludge storage tank 9 by the spindleless screw.

The treated wastewater is introduced into the electric reactor 11 and adjusted to the water quality suitable for flocculation with colloidal material for the secondary pipe agglomeration 14 and the secondary pressure flotation 15 process.

Also in the secondary pipe agglomerator 14, as in the primary pipe agglomerator 4, a treating agent such as a flocculant, a admixture, a neutralizing agent, etc. is supplied, mixed and aggregated by turbulence, and then transferred to the secondary pressure flotation separator 15. Injuries are eliminated. High concentrations of wastewater after two flotation processes are introduced into the following biological treatment processes.

The treated wastewater is subjected to a pre-treatment step in the next biological treatment means 17 to form an anaerobic step without oxygen supply, and in the anaerobic step, microorganisms inhale organic matter from the wastewater and simultaneously elute phosphorus and undergo an anaerobic step. Wastewater is oxidized by aerobic microorganisms and oxygen in the aerobic phase, and nitrogen is nitridated and nitrified. The microorganisms which released phosphorus in the anaerobic stage ingest excessive phosphorus in the wastewater. Subsequently, a precipitation step is formed to form a solid-liquid separation and an anoxic step is formed to remove nitrous nitrogen and nitrate nitrogen with nitrogen gas. The supernatant is discharged through the discharge pipe and part of the sludge precipitated is removed by the air suction device using the air of the blower to remove organic matter and phosphorus in the waste water. By repeating the above process, the processing efficiency can be further improved.

Wastewater from which the organic matter, nitrogen and phosphorus are removed from the biological treatment means 17 is discharged after being linked to the sewage treatment plant via the discharge tank 22.

As described above, the wastewater contained in the food waste is desorbed with a centrifugal dehydrator and purified through pressurization, flotation, and biological treatment to improve the water quality, and the food waste from which the water is removed can be fermented. By recycling, it is possible to prevent the environmental pollution caused by the food waste, and to clean and discharge the waste water to prevent the leachate of the food waste as it penetrates into the ground as it is conventionally to prevent contamination of groundwater, water and sewage and land. Applicable

Claims (1)

(a) desorbing the concentrated food waste using a centrifugal dehydrator; (b) by sequentially introducing the desorbed wastewater and the food waste stripping liquid generated during the feed or composting process to the first pipe agglomerate and the pressure flotation separation tank to remove SS, BOD, COD and the sludge bottom and sludge sludge storage tank Sending the remaining treated water to an appropriate water quality for the secondary flotation separation through an electric reactor; (c) flowing the wastewater passed through the electric reactor back into the secondary pipe aggregator and the pressure flotation separation tank to remove SS, BOD and COD, and sending the sludge to the sludge storage tank, and introducing the remaining treated water into the next biological process; (d) by applying the biological treatment to the anaerobic, aerobic, anoxic, and precipitation steps by using the biological treatment to remove the organic matter, nitrogen and phosphorus simultaneously and the sludge to the first storage tank, the second storage tank and sludge storage tank The system is configured to discharge the upper water into the discharge tank and discharge it in connection with the sewage terminal treatment facility.