JPS5857357B2 - Sludge treatment method at sea - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating sludge on the ocean.

A conventional sludge treatment plant consists of a sludge dredger → a discharge pipe →
It consists of land-based (fixed) treatment plants (mainly mechanical dewatering), but this poses problems in terms of mobility.

Recently, efforts have been made to increase the mobility of the treatment plant by mounting it on a barge and moving the barge.

However, according to this, since the entire treatment plant is installed on a barge, this barge becomes large, and therefore sufficient maneuverability cannot be expected when the area to be dredged is narrow.

On the other hand, when the barge is made smaller, it is not possible to spend enough time to concentrate the sludge water with a high moisture content from the dredger side, and the high concentration sludge cannot be dumped.

Therefore, the present invention provides an offshore sludge treatment method that can be expected to have high maneuverability even in narrow dredging areas and can dump highly concentrated sludge. , using a sludge supernatant water treatment barge that processes and discharges sludge supernatant water, and a concentrated sludge solidifying agent injection barge that solidifies the concentrated sludge and then discharges it to a dumping site; Sludge treatment is carried out through a cycle of receiving the sludge pumped up by the dredger, concentrating it, transferring the supernatant water to the water treatment barge, and transferring the concentrated sludge to the solidification agent injection barge. The above object has been achieved with this configuration.

An embodiment of the present invention will be described below based on the drawings.

Dredger 2 operating in dredging area 1 as shown in Figure 1
A plurality of sludge concentration barges 3, a sludge supernatant ice water treatment barge 4, and a concentrated sludge solidifying agent injection barge 6 moored near the dumping site 5 are prepared.

Since the dredger 2 is a conventional dredge, its details will be omitted, but the structure and operation of each barge 3, 4, and 6 will be described below.

As shown in FIGS. 2 to 5, the sludge enrichment barge 3 is moored on the ocean near the sludge dredger 2, and a plurality of barges (four in the embodiment) are placed at the center of the ship in the bow and aft direction. Nohep
o A concentration tank 7 is provided, and supernatant water tanks 8 are provided on both sides of the sludge concentration tank 7.

Note that the supernatant water tank 8 also serves as a leg water tank. A sludge supply pipe 10 whose base end is connected to the dredger side is provided on the upper deck 9,
A sludge mixing tank 11 and a valve 12 are provided in the piping, and branched ends lead to each sludge concentration tank 7.

A traveling crane 13 that can travel in the bow and stern direction on the upper deck 9 suspends a concentrated sludge transfer pump (submersible pump) 14, and a concentrated sludge transfer hose 15 from this pump 14 is connected to the upper part of each sludge concentration tank 7. It can be connected to the concentrated sludge discharge pipe 16 whose branched proximal end is located at.

This concentrated sludge discharge pipe 16 is provided with a valve 17 .

Note that the sludge supply pipe 10 includes a sludge removal pipe 1 from the dredger 2.
8 can be connected to the concentrated sludge discharge pipe 16,
A concentrated sludge transport hose 19 can be connected to the solidifying agent injection barge 6.

The upper part of the sludge concentration tank 7 is connected to an overflow valve 2.
A supernatant water transfer pipe 21 that opens into the supernatant water tank 8 through the water treatment barge 0 and into each supernatant water tank 8 can be connected to a supernatant water transfer hose 22 to the water treatment barge 4 .

Furthermore, a sludge transfer hose 23 from the water treatment barge 4 can be opened into the sludge concentration tank 7 .

The sludge water with a high water content that is lifted by the sludge dredger 2 and sent through the sludge removal pipe 18 is mixed with a sedimentation accelerator (coagulation sedimentation agent) in the sludge mixing tank 11, and the sludge is passed through the sludge supply pipe 10. It is put into the concentration tank 7.

The sludge is then allowed to stand still in the sludge concentration tank 7 for a period of time, and is separated into supernatant water and concentrated sludge.

The supernatant water overflows by gravity into the supernatant water tank 8 via the overflow valve 20.

The sludge water originally received with a high water content is dehydrated (drained) and becomes concentrated sludge with a high concentration.

This sludge is lifted up by a concentrated sludge transfer pump 14 suspended from a traveling crane 13, and sent to the solidifying agent injection barge 6 via a transfer hose 15, a drain pipe 16, and a concentrated sludge transport hose 19.

On the other hand, the supernatant water overflowing into the supernatant water tank 8 still has sludge floating in it, and cannot be discharged immediately.

This is sent to the water treatment barge 4 side via a transfer pipe 21 and a transfer hose 22.

The tiger herring crane 13 running on the barge 3 is
In addition to moving and suctioning the concentrated sludge transfer pump 14, it is also used as a joint for the sludge removal pipe 18 from the dredger 2, a joint for receiving pipes for chemical solutions, etc., and can also be used for repairing various machines on board the ship. It is a crane with functions.

As shown in FIGS. 6 to 8, the sludge supernatant ice water treatment barge 4 has a plurality of water treatment sedimentation tanks 24 (two in the embodiment) and a pump chamber 25 in the center of the ship in the bow and aft direction. and
A leg water tank 26, a fuel oil tank 27, and a fresh water tank 28 are provided on both sides of the water treatment sedimentation tank 24, and a chemical tank 29 is provided on both sides of the pump chamber 25.

Furthermore, a reaction tank 30 and a filtration tank 31 are provided, and a treated water discharge pipe 32 from the water treatment sedimentation tank 24 is connected to this filtration tank 31, and a discharge water pump 33 located in the pump chamber 25 is connected to the pipe. It is set up.

The supernatant water transfer hose 22 from the sludge concentration barge 3 side can be connected to a pump 34 in the pump chamber 25, and the pump 34 communicates with the reaction tank 30 via a supernatant water transfer pipe 35.

A supernatant water supply pipe 36 from this reaction tank 30 opens into the water treatment sedimentation tank 24 .

Further, a sludge transfer pipe 37 communicating with the lower part of the water treatment sedimentation tank 24 communicates with a pump 38, and the sludge transfer hose 23 leading to the sludge concentration barge 3 can be connected to this pump 38.

Sludge is still floating in the supernatant water separated by concentration in the sludge concentration barge 3, and it cannot be discharged immediately.

This is sucked by a pump 34 through a supernatant water transfer hose 22 and further sent to a reaction tank 30 via a supernatant water transfer pipe 35.

Here, the supernatant water is mixed with the drug from the drug tank 29 and is put into a water treatment sedimentation tank 24 after the supernatant water is brought into a state where it is easy to co-precipitate.

The Heto River 1 precipitated at the bottom of the water treatment sedimentation tank 24 is returned to the sludge concentration barge 3 again by the pump 38 via the sludge transfer pipe 37 and the sludge transfer hose 23, and is treated in the sludge solidification process described above. .

In addition, the supernatant water that has become clear in the water treatment sedimentation tank 24 is sent to the filtration tank 31 via the treated water discharge pipe 32 by the discharge water pump 33.
The water is sent to the river, where it is made into highly clear water and then released.

The properties of this discharged water can be planned to meet any discharge standards.

As shown in FIGS. 9 and 10, the concentrated sludge solidifying agent injection barge 6 has a concentrated sludge transport hose 19 connectable to its upper end, and a concentrated sludge discharge hose 39 to the dumping site 5 at its lower end. This transport pipe 40 is provided with two stages of line mixers 4L42, front and rear, and a concentrated sludge transport pump 43 located downstream of these line mixers 4L42.

44 is a coagulant dissolving tank for diluting and dissolving a coagulant (water glass coagulant, referred to as 5IL-B agent), and a supply pipe 45 from this tank is connected to a concentrated sludge transport pipe 40 above the line mixer 41 in the previous stage. do.

46 is a curing agent dissolving tank for diluting and dissolving a silicate curing agent, and a supply pipe 47 from this tank is connected to both line mixers 41.
42 and connected to the concentrated sludge transport pipe 40.

48 and 49 indicate pumps. Concentrated hetotransport hose 19
The water glass coagulant from the coagulant dissolving tank 44 is first injected into the concentrated sludge being transported from the sludge to the concentrated sludge transport pipe 40, and then stirred and mixed in the line mixer 41.
After the silicate curing agent is injected from the curing agent dissolving tank 46, it is stirred and mixed in the line mixer 42.

The concentrated sludge into which the solidifying agent has been injected in this way does not solidify immediately and is still in a fluid state, so it is transported to the dumping site 5 via the concentrated sludge discharge hose 39 by the concentrated sludge transport pump 43, and then gelled ( to solidify) to be (kanaru).

As mentioned above, each of the barges 3 and 4.6 performs its own function, and as shown in Fig. The barge 6 is moored, and the concentrated sludge discharge hose 39 from the solidifying agent injection barge 6 is led to the dumping site 5.

Further, one of the plurality of sludge thickening barges 3 is moored near the dredger 2, and the sludge removal pipe 18 from the iron liquefier 2 is connected to it, and the sludge is being received.

Then, another sludge concentration barge 3 is moored near the water treatment barge 4, and both barges 3 and 4 are connected with a supernatant water transfer hose 22.
This is referred to as the water treatment center.

Furthermore, another sludge concentrating barge 3 is moored near the solidifying agent injection barge 6, and both barges 3 and 6 are connected by a concentrated sludge transporting hose 19, so that the solidifying agent is being injected.

In addition, the remaining sludge enrichment barge 3 is currently in the process of concentrating and receiving the sludge and is on standby.

As a result, it is only necessary to bring only one sludge concentrating barge 3 close to the dredger 2 while receiving the sludge, and the same goes for the water treatment center and the solidifying agent injection port. By increasing the number of sludge concentration barges 3, the concentration time, that is, the stationary separation time can be made sufficiently long.

As can be seen from the above, the sludge concentrating barge 3 is in the process of receiving (a) → concentrating (2) → water treatment (b) → solidifying agent being injected (c) →
The receiving vessel moves in a cycle of waiting (ho) → receiving vessel (while waiting), and the number of vessels is determined according to the properties of the sludge and the dredging ability of the dredger 2.

That is, for example, in the case of sludge with a high water content, the number of sludge concentration barges 3 and water treatment barges 4 is increased. According to the present invention described in the embodiments, the following effects can be expected. .

・Since each barge is divided, it exhibits higher maneuverability.

In other words, by dividing, each can be made smaller, and even if the dredging area is narrow, only the sludge concentrating barge can approach the dredging vessel and receive the sludge, thereby increasing the mobility of the dredging area. can.

- By using multiple sludge concentration barges in a cycle, it is possible to take a long time for static separation (sludge concentration) and obtain highly concentrated sludge.

The processing capacity can be determined by the number of O-fleets or by the number of each barge in the fleet, and it is possible to handle processing of any scale and enable a wide range of selection of processing capacity.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with Fig. 1 being a schematic plan view showing the working state, Figs. 2 to 5 showing the Hedo Koma enrichment barge, Fig. 2 being a side view, and Fig. 3 is a plan view, Fig. 4 is a horizontal sectional view, Fig. 5 is a cross sectional view, Figs. 6 to 8 show the sludge supernatant ice water treatment barge, Fig. 6 is a side view, and Fig. 7 is a plan view. figure,
FIG. 8 is a horizontal sectional view, FIGS. 9 and 10 show the concentrated sludge solidifying agent injection barge, FIG. 9 is a side view, and FIG. 10 is a horizontal view. 1... Dredging area, 2... Dredger,
3...Sludge concentration barge, 4...Sludge supernatant ice water treatment barge, 5...Dumping site, 6...
...Concentrated sludge solidifying agent injection barge, T...Sludge concentration tank, 8...Supernatant water tank, 18...Sludge removal pipe, 19...・Concentrated sludge transport hose, 22・
...Supernatant water transfer hose, 23...Sludge transfer hose, 24...Water treatment sedimentation tank, 31.
...Filter tank, 39...Concentrated sludge discharge hose, 44...Coagulant dissolving tank, 46...
・Hardening agent dissolution tank.

Claims (1)

[Claims] 1. A plurality of sludge concentration barges that concentrate sludge, a sludge supernatant water treatment barge that processes and discharges sludge supernatant water, and a sludge solidification barge that solidifies concentrated sludge and then discharges it to a dumping site. a step of receiving the sludge pumped up by the dredger using the sludge concentration barge, a concentration step, a step of transferring supernatant water to the water treatment barge, and a solidifying agent injection table. A method for treating sludge in an offshore tank, characterized by treating sludge in a cycle of transferring concentrated sludge to a ship.