The present invention relates to a method and apparatus for utilizing sludge as a carbon source for an advanced wastewater treatment, and more particularly to a method and apparatus for sludge disintegration, wherein sludge discharged from an advanced biological wastewater treatment process is physically and/or chemically decomposed thus to reduce the sludge and to utilize the same as a carbon source for denitrification and phosphorus release, thereby improving an efficiency of removing nutrients.
BACKGROUND ART Also, the present invention relates to a method and apparatus for an advanced biological wastewater treatment, and more particularly to a method and apparatus for advanced wastewater treatment without sludge discharge using sludge disintegration, in which the sludge dissolved through the sludge disintegration for reducing the sludge and utilizing the same as a carbon source is utilized as a feed of a microorganism.
Generally, wastewater treatments have been rapidly developed together with a development of an activated sludge process using a microorganism and have been conducted in order to remove organic compounds and suspended solids. The treatments have been developed into various modified methods while the treatments have being developed into an advanced wastewater treatment process capable of removing nitrogen and phosphorus. Taking a close look at a principle of the presently developed advanced biological wastewater treatment, nitrogen removal is conducted so that NH4+ is converted into N02 or N03 by nitrification using microorganism and N2 gas is then discharged through denitrification, and phosphorus removal is conducted so that phosphorus dissolved under anaerobic condition is excessively absorbed under aerobic condition by microorganism, and sludge is then removed. There are many processes for removal of nitrogen and phosphorus using such principle, including A2/0, modified Bardenpho, Virginia Initiative Plant (VIP) and University of Cape Town (UCT), etc.
In order to successively manage such advanced biological treatment processes, biological reactors under anaerobic, anoxic and aerobic conditions should be provided, sufficient carbon sources are necessary for phosphorous release and denitrification under the anaerobic and anoxic condition, and high leveled technical know-how is required for such as discharging sludge absorbing excessive phosphorus in a constant quantity. Further, as shown in FIG. 1, there are required an equipment for thickening, dewatering and storage, etc. , and a final proceeding for incineration and landfill, etc. so as to treat excess sludge discharged from the process.
Looking through problems of wastewater treatment by the presently used installation, most of the installations can remove organic compounds and suspended solids using ac activated sludge process, but hardly remove eutrophication-producing nitrogen and phosphorus, whose substantial part is discharged in a undisposed state to induce eutrophication of lake and river, thus causing serious problems in securing high quality water resources and in conserving natural ecosystem. Thus, it is true that government enhances restriction of nitrogen and phosphorus in discharge water quality standard and concentrically develops and distributes the advanced wastewater treatment process for removal of nitrogen and phosphorus.
However, taking a close look at inflow water quality of a conventional sewer system for wastewater disposal, practically, most of sewer systems considerably lack a carbon source for biological denitrification and phosphorus release, or have the carbon source with very low concentration hardly to operate the biological treatment.
Accordingly, in order to efficiently manage the advanced wastewater treatment process, organic compound lacking in inflow water should be supplemented by an external carbon source such as methanol. However, such external carbon source such as methanol, etc. is higher in price so that it is hardly used due to economical problem.
Recently, it has been widely studied that organic acid, sludge and foodwaste fermentation broth are utilized instead of the external carbon source.
Also, the advanced biological wastewater treatment process necessarily discharges sludge whose treatment technology is practically dependent on thickening, low efficiency anaerobic digestion treatment, dewatering and landfill. However, in the conventional waste sludge treatment method, sites for landfill is required thus to cause a cost problem. In fact, it has been known that cost for waste sludge treatment by the method corresponds to about 40% of the total cost of wastewater treatment.
Meanwhile, with an enforcement of mandatory control, it is expected to carry the waste sludge in the final landfill, so that new method for waste sludge treatment being required. Thus, if organic sludge discharged from the biological treatment process is re-used as a carbon source for advanced wastewater treatment through pre- treatment, it is most effective to utilize the sludge and it is expected to solve the environmental and economical problems possibly generated upon landfill or incineration of the sludge.
DISCLOSURE OF THE INVENTION Accordingly, the present invention has been made to solve the above- mentioned problems occurring in the prior art, and an object of the present invention is to provide a method for sludge disintegration in which physical treatment and/or chemical treatment are conducted to sludge necessarily generated from an advanced wastewater treatment process thus to make microorganisms extinct and to decompose their organic structure, firstly reducing the sludge and utilizing the same as a carbon source for denitrification and phosphorus release, thereby increasing removal efficiency of nutrients.
Another object of the present invention is to provide a method and apparatus for advanced wastewater treatment without sludge discharge using sludge disintegration, wherein the sludge treated with physical and/or chemical sludge disintegration is utilized as a carbon source for advanced biological wastewater treatment to hardly generate excess sludge, thus not to generate a problem such as landfill and to possibly to be effectively adapted to inflow water having low concentration.
In order to accomplish these objects, there is provided a method of sludge disintegration for reducing the sludge and utilizing the same as a carbon source
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