KR930001811B1

KR930001811B1 - Sludge treating method

Info

Publication number: KR930001811B1
Application number: KR1019910003777A
Authority: KR
Inventors: 황호운
Original assignee: 황성원; 황호운
Priority date: 1991-03-08
Filing date: 1991-03-08
Publication date: 1993-03-13
Also published as: KR920017958A

Abstract

내용 없음.No content.

Description

High concentration treatment method of surplus sludge

잉여오니의 침전상태를 표시한 그래프로서 오니체적과 처리시간과의 관계를 나타낸 것.A graph showing sedimentation status of surplus sludge, showing the relationship between sludge volume and treatment time.

본 발명은 활성오니법(活性汚泥法)으로 오, 폐수를 처리할 때 발생하는 잉여오니를 농축조에 투입하여 고농축 처리하는 방법에 관한 것이다. 오, 폐수 즉 생활하수를 정화함에 있어서, 1차 처리가 끝난 하수를 활성오니로 2차 처리할 때 잉여오니가 발생하게 됨은 주지의 사실이다. 상기 잉여오니는 콜로이드성이고 그 체적에 비하여 표면적이 크며 또 표면장력과 모세관현상으로 말미암아서 수분흡착량이 많기 때문에 농축하기가 매우 어려웠으며, 그 결과 생활하수처리 분야에서 잉여오니의 처리는 돈이 많이 드는 처리인 것으로 알려져 있다.The present invention relates to a method for high concentration treatment of surplus sludge generated when treating wastewater and wastewater by an active sludge method into a concentration tank. It is well known that in purifying wastewater, that is, sewage, surplus sludge occurs when the sewage after primary treatment is treated with activated sludge. The surplus sludge is colloidal and its surface area is large compared to its volume, and due to the surface tension and capillary phenomenon, it is very difficult to concentrate because of the large amount of water adsorption. It is known to be a lifting treatment.

즉, 종래의 농축방법으로는 첨부된 그래프로 알 수 있는 바와 농축조에 유입량 1,000㎥/일, 농도 0.8%의 잉여오니가 유입되면 곡선 A로 표시되는 바와같이 12시간 후에는 480㎥/일, 농도 1.7%로 농축된 잉여오니가 침전되어서 배출되기 때문에 혐기성 미생물로 처리되는 소화조에서 처리할 때 소화조의 처리량인 250㎥/일은 소화조에서 처리할 수 있으나 나머지 230㎥/일의 잉여오니는 소화조에서 처리할 수 없기 때문에 부득이 하수로 방류할 수 밖에 없었으며, 그 결과 생활하수의 완전한 정화처리를 할 수 없었다.That is, in the conventional concentration method, as shown in the attached graph, when the inflow rate of 1,000 m 3 / day and 0.8% of surplus sludge flows into the concentration tank, as indicated by the curve A, after 480 m 3 / day, the concentration is 12 hours. Since the surplus sludge concentrated to 1.7% is precipitated and discharged, when processing in an digester treated with anaerobic microorganisms, the throughput of the digester can be 250㎥ / day, but the remaining 230㎥ / day of surplus sludge can be treated in the digester. Inevitably, it was forced to discharge to sewage, and as a result, it was not possible to perform a complete purification of domestic sewage.

뿐만 아니라 종래의 농축방법을 채용하는 경우에는 때때로 농축조내에 발생된 질산화현상으로 인하여 오니가 부상(浮上)하여 침전이 불가능해지는 경우도 있었다. 이렇게 되면 유입되는 1,000㎥/일, 농도 0.8%의 전체 잉여오니가 농축조에서 침전이 되지 않은 채 소화조로 투입되어야 하므로 소화조의 처리용량인 250㎥/일을 초과하는 750㎥/일(농도 0.8%)의 잉여오니처리는 할 수 없게 되고 하천으로 방류할 수 밖에 없는 문제점이 있었다.In addition, when the conventional concentration method is employed, sludge sometimes floats due to nitrification generated in the concentration tank, which makes it impossible to settle. In this case, the total surplus sludge of 1,000 m3 / day and 0.8% of concentration should be introduced into the digester without settling out of the concentration tank, so that it exceeds 750㎥ / day (concentration 0.8%) exceeding the treatment capacity of the digester. Surplus sludge treatment could not be done and there was a problem inevitably discharged to the river.

본 발명은 이와 같은 문제점을 해결한 것으로서 농축조에 유입된 잉여오니가 단시간내에 고농도로 농축되도록 함으로서 종래처럼 처리가 되지 않는 잉여오니가 발생됨이 없이 잉여오니를 완전하게 처리할 수 있도록 한 것인바 이하 상세히 설명하면 다음과 같다.The present invention is to solve this problem as the surplus sludge flowing into the concentration tank to be concentrated to a high concentration within a short time to be able to completely process the surplus sludge without generating a surplus sludge which is not treated as conventionally described in detail below The explanation is as follows.

본 발명은 잉여오니를 농축조에서 침전시킴에 있어서, 잉여오니에 공침제(共沈劑)로서 토사류 또는 분쇄한 연탄재를 혼합하여 침전시킴을 특징으로 한다.The present invention is characterized by precipitating a sludge in a thickening tank by mixing earth or crushed briquettes as a co-precipitation agent.

본 발명에 사용되는 공침제는 입자크기가 60∼100멧슈 정도의 것이며, 잉여오니와의 혼합량은 잉여오니 건조량에 대하여 공침제를 중량비로 대략 1 : 1로 혼합하는 것이 좋다. 본 발명에서 공침제는 잉여오니에 대하여 농축촉진제로 작용함과 동시에 잉여오니의 응집보조제로 작용하기 때문에 공침제를 사용하여 농축조에서 처리하면 저농도의 잉여오니가 고농도로 농축되면서 응집되기 때문에 종래의 단순농축방법에 비하여 침전이 신속하며 용이하게 이루어질 수 있다.The coprecipitation agent used in the present invention has a particle size of about 60 to 100 mesh, and the mixing amount with the surplus sludge is preferably mixed with the coprecipitation agent in a weight ratio of 1: 1 by weight of the surplus sludge. In the present invention, the coagulant acts as a thickening agent for the surplus sludge and at the same time acts as a coagulant aid of the surplus sludge. Compared to the concentration method, precipitation can be performed quickly and easily.

[실시예 1]Example 1

유입량 1,000㎥/일(농도 0.8%)의 잉여오니를 농축조에 투입하고, 여기에 공침제로서 60멧슈의 연탄재 8,000㎏을 혼합시켰다. 유입된 잉여오니중 750㎥/일 12시간 후에 청등수(靑燈水)가 되어 농축조상부에서 넘쳐흘러서 하천에 방류되었으며 농축조저변에서 250㎥/일(농도 3.2%)의 고농축 잉여오니를 인발하여 처리용량 250㎥/일의 혐기성미생물로 처리하는 소화조에 투입하여 처리하거나, 탈수기에 압송하여 탈수, 응집시켜서 처리를 완료하였다.Surplus sludge with an inflow rate of 1,000 m 3 / day (concentration 0.8%) was added to the concentration tank, and 8,000 kg of briquettes of 60 mesh were mixed therein as a co-precipitation agent. After 12 hours of 750㎥ / day of flowing sludge, it became blue water and flowed out from the concentration tank and discharged into the river.The concentrated sludge of 250㎥ / day (concentration 3.2%) was drawn from the bottom of the concentration tank and treated. Treatment was carried out by adding to a digester treated with an anaerobic microorganism with a capacity of 250 m 3 / day, or by dehydrating and agglomerating by transporting to a dehydrator.

[실시예 2]Example 2

공침제로서 토사류를 사용한 것 외에는 실시예 1과 동일하게 처리하였다.The same process as in Example 1 was carried out except that earth and sand were used as the coprecipitation agent.

본 발명은 첨부된 그래프의 B곡선이 표시하는 바와같이 농축조에 유입된 잉여오니는 90분후 50%가 침전하였으며, 12시간 후에는 그 부피가 1/4로 감소된 대신에 농도는 3.2%로 높아졌으므로 고액분리(固液分離)가 매우 용이하였다.In the present invention, as indicated by the curve B of the attached graph, 50% of the surplus sludge introduced into the thickening tank settled after 90 minutes, and after 12 hours, the volume was reduced to 1/4, but the concentration was high as 3.2%. As a result, the solid-liquid separation was very easy.

Claims

A method of high concentration treatment of surplus sludge, characterized in that the co-precipitation is mixed when the sludge generated in the treatment of sewage and wastewater by the activated sludge method is precipitated in a concentration tank.

The method of high concentration treatment of surplus sludge according to claim 1, wherein the co-precipitation agent is a soil or briquette.

The high concentration treatment method of surplus sludge according to claim 1, wherein the coprecipitant has a particle size of 60 to 100 mesh.

The high concentration treatment method of surplus sludge according to claim 1, wherein the mixing amount of the coprecipitation agent is 1: 1 in weight ratio to the dry amount of the surplus sludge.