JPS58146485A - Treatment of landfill sewage - Google Patents

Abstract

PURPOSE:To stabilize the volume and quality of the sewage in a regulating reservoir for land-fill sewage and to attain miniaturization treatment faciliates by delineating a land-fill disposal plant into land-fill blocks exclusively for solid and inorg. waste and for solid waste, and forming the regulating reservoir adjacently to the latter. CONSTITUTION:The water leaching out from inorg. and general blocks 6a, 6b in a land-fill disposal plant 2 produces a large amt. of land-fill sewage in about 2 days in rainy seasons to begin to flow through a water collecting pipe 8 into a regulating reservoir 3. Part of the inflow sewage A in this stage is returned into the block 6a by a circulation pump 9, and the sewage A is held in the plant 2. The sewage A in the reservoir 3 can thus be maintained stably without increasing the volume thereof quickly even in the rainy seasons, whereby the load on treatment facilities 4 for land-fill sewage can be reduced and maintained constant. Since biological reaction is progressed thoroughly by the uniform spraying of the sewage A in the block 6a, the quality of the sewage A in the reservoir 3 in the initial period of land filling is improve and is maintained stably, to reduce the load on the facilities 4 and to keep it constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to reduce the number of people in a sewage treatment facility by stabilizing the amount and quality of water leached from a solid waste landfill, that is, landfill sewage. This invention relates to a method for treating landfill wastewater that can be made more compact and more economical.

Landfill sewage treatment fIA is generally carried out by the method shown in FIG. In this figure, l is solid waste, 2 is solid waste 10 landfill site, 8 Fi is a regulating pond for temporarily storing leachate from landfill site 2, that is, landfill sewage A, 4 is a landfill sewage treatment facility, and 5 is a sewage pump for feeding the landfill sewage At1i to the standing sewage treatment facility 4. That is, landfill sewage A
When M reaches the m* pond 8, the sewage pump 6 is activated and the entire amount of the landfill sewage A is transferred to the landfill sewage treatment i! The amount and quality of the landfill sewage A sent to the facility e4 is sent to the facility e4, but the following peak characteristics are observed, Sewage treatment 3ml facility 4th floor
Since the design takes such peak characteristics into consideration, the scale of the facility becomes larger than necessary, and its economic efficiency is reduced (i.e., landfill wastewater A#i solid waste waste guide). Rainfall% I411 It is composed of moisture held by the substance itself, moisture produced by decomposition, spring water, etc., but the amount of water varies greatly depending on whether or not there is rainfall.In other words, when comparing the rainy season and the dry season, Landfill sewage A in pond 8 during the period
Water amount #i.

This is more than five times higher than during the dry season. Therefore, the 4tj landfill sewage treatment facility is designed to be able to cope with such rainy seasons, but considering the dry season, the necessary scale of the landfill sewage treatment facility can be reduced. It takes.

For example, the water quality characteristics of landfill wastewater A change as shown in Figure 2).
Both CODs were about 6000 ppm! l
Approximately 2 years after establishment, the BOD is approximately 200 ppm (
[approximately 1/25 of the initial concentration) Kt, and C0DFi approximately 80
It naturally decreases at 0 ppm (ie, initial concentration 1/@) tct. On the other hand, the landfill sewage treatment facility 4 has the capacity to effectively treat the above-mentioned poor quality landfill sewage A in the early stages of landfilling, and is designed and constructed with a service life of usually 10 years or more. For more than eight years, the operating efficiency of the sewage treatment equipment was only about 40gI, which has been placed in the landfill sewage treatment facility4), further worsening the economic efficiency of the landfill sewage treatment facility. ing.

The present invention was made with attention to these nine circumstances, and its purpose is to stabilize the water volume and quality of landfill sewage by alleviating the peak characteristics observed in the water volume and quality of landfill sewage as described above. An object of the present invention is to provide a method for treating landfill sewage that can reduce the load on a landfill sewage treatment facility, thereby making the facility more compact and increasing its economic efficiency.

However, the treatment method of the present invention, which has achieved these objectives, is a waste treatment method in which a landfill site is divided into solid and inorganic #i leaf waste landfill blocks (hereinafter simply referred to as "inorganic yarn blocks") and one or more solid materials. %Mu Physical block C and below are simply "general blocks"
), and adjoining a regulating pond for temporarily storing leachate from the landfill disposal site, that is, landfill sewage, a circulation pump is placed inside or outside the regulating pond, and a circulation pump is installed inside or outside the regulating pond, The gist of this method is to stabilize the amount and quality of the reclaimed wastewater in the pond by returning a portion of the reclaimed wastewater to the inorganic block.

The configuration and effects of the present invention will be explained below based on the drawings of the embodiment, but the following 5lil embodiment is merely a representative example.
It is also possible to carry out the implementation with appropriate changes within the scope consistent with the spirit of the preceding and following descriptions.

FIG. 8 is a schematic explanatory diagram showing a method for treating landfill sewage according to the present invention, and the same parts as the conventional J11wt shown in FIG. 1 are given the same reference numerals. In this figure, gai
i inorganic block, 6bki general block, D, 8
Fi Collection pipe for efficiently guiding the leachate from each of these blocks into the regulating pond B, 9 Fi A circulation bonder placed in the pond 8 to return the landfill wastewater A to the inorganic block 6 & S * A circulation bonder placed in the pond 8 ! 11 is a pipe for returning the landfill wastewater A, and a pipe for supplying the same.

Now, at the landfill site 2, during the rainy season, after about two days from the first day of rain, the inorganic block Ba and the general block 6b are removed.
The leachate logs turn into a large amount of landfill wastewater and begin to flow into the regulating pond 8 from the water collection pipe 8. At this time, the wt1 ring pump 9 is operated to return a portion of the inflowing landfill sewage A to the non-411 system block 6a, and the landfill sewage A is held in the landfill site 1. Even during the #IIP rainy season, the amount of landfill sewage A in the regulating pond 8 can be maintained stably without rapidly increasing, thus reducing the load on the landfill sewage treatment M facility 4 and keeping it constant. be able to.

The return operation of landfill sewage A as described above is carried out from the early rainy season of the landfill, and the return is carried out to the inorganic block 6, a as described above.

In this case, the landfill wastewater A is returned so as to be uniformly scattered near the upper surface of the inorganic block 6a, so that the interior of the inorganic block 6a resembles a watering hearth. In other words, the noncombustible material block 6a becomes a soft part in which a positive biological reaction m is formed. Therefore, by returning the landfill sewage A several times as described above, the biological reaction sufficiently progresses, and due to its effect, the BOD in the landfill sewage can be easily reduced from about 5000 ppm at the initial stage of landfilling. about 2 to
00 ppna and can be maintained.

(Thus, the water quality of the landfill sewage A in the regulating pond B at the initial stage of the landfill can be increased and maintained stably, and the load on the landfill sewage treatment Wk4 can be reduced and kept constant.

Therefore, when designing the landfill sewage treatment system RJ4, it is possible to set the characteristic setting value of the landfill sewage used for treatment raw water to approximately A5 in terms of water quantity and approximately A5 in terms of water quality (converted to ROD concentration).
The fact that the facility 4 can be made very compact makes it extremely economical.

In the above embodiment, the circulation pump 9 and the sewage pump 5 are arranged separately to return the landfill sewage A to the inorganic block 6a.
. . , and to the landfill sewage treatment facility 4 through independent meridians. Alternatively, the circulation pump and the sewage pump may be used together, and the sewage pump may be used by switching between them as appropriate.

Since the treatment method of the present invention has achieved the above outline, it is possible to stabilize the water volume and water quality by alleviating the peak characteristics seen in the water volume and water quality characteristics of landfill sewage generated at a landfill disposal site. became. As a result, the load on the landfill sewage treatment facility can be reduced, the facility can be made more compact, and its economic efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional method for treating landfill sewage, Fig. 2 is a graph showing changes in the water quality load of landfill sewage after the start of landfilling, and Fig. 8 is a schematic illustration of a method for treating landfill sewage according to the present invention. It is a diagram. 2...Landfill site 8...Adjustment pond 4...Landfill sewage treatment facility 5...Sewage pump-...Landfill block for non-combustible solid R waste 8...Water collection pipe 9... ? Iil pump 10...Return piping 11...Feeding piping A-...Landfill sewage applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] 1x) I! Landfill plotter for solid and inorganic waste and one or more solid #! Qin physical standing block and ml
! At the same time, a regulating pond for temporarily storing leachate from the landfill site is adjacent to the regulating pond, and a circulation pump is disposed inside or outside the regulating pond, and a part of the leachate in the regulating pond is converted into the solid by the pump. and by returning it to a dedicated landfill block for non-chemical waste. A method for treating landfill wastewater, comprising stabilizing the amount and quality of leachate in the regulating pond.