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Bottom mud process
MSC Method
 Construction Example
 What is MSC Method?
 The principle
 Specific characteristics
 Advantage construction
 About component
 Features and effects
 The process of bottom
 sediment treatment
 Effective utilization of
 separated soil
Prevention against bad odor
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MSC method PJ
 Bottom mud process

MSC Method - Miracle Sludge Clean Method -

Let's clean contaminated rivers, lakes/marshes and seas!!
 In rivers, lakes/marshes and seas, bottom mud is being deposited in the bottom for a long time due to the inflow of domestic sewage and sand. This bottom mud (organic mud:sludge) will not only cause water quality to detoriate but will also interfere with the degradation of water storage volume, water flow rate and ship navigation. During summer, as the water temperature rise, nitrogen and phosphorus will increase, that will lead to eutrophication. Moreover, the massive outbreak of algal bloom due to photosynthesis causes water contamination and releases a bad odor.
 Bottom mud treatment technology with MSC method can quickly and economically improve large amount of bottom mud to good quality soil by its flocculation ability, dehydration separating action and aggregation function. Suspended solids, BOD, nitrogen and phosphorus are removed from the water through this advanced treatment. Since MSC does not have a negative impact on the Ecosystem, it also creates suitable environment for fish and aquatic organisms.

1. It is confirmed that treated water and soil are safe
2. It has deodorization and sterilization effects
3. It can re-use the treated soil for plants because it is harmless
4. It can cut time and cost because the processing speed is fast

・Bottom mud treatment for lakes/marshes, rivers and dam
・Treatment for deposited bottom sludge and contaminated water
・Treatment for deposited bottom sludge and contaminated water in the sea
・Treatment for sludge and contaminated water from industry disposal
・Treatment for sludge and contaminated water from agriculture
・Treatment for sludge and contaminated water from sewage

Construction Example

Environmental maintenance construction at the moat of Joshi park in Takasaki city
 Dredging range:431.8m、  Amount of dredging sludge:1,081m3
 Construction: SO-EN CO., LTD  Planning: (NPO) Japan Water Guard

What is MSC method?

 With iron salt and metal salt as its main components, this method is carried out by using an inorganic coagulant made out from rare earth elements called "MSC" for bottom mud treatment and water purification technology .
 As hydrophobing dehydration treatment and soil stabilization additive, MSC facilitates dredge bottom mud precipitation and consolidation fast, as well as purify the separated water.
 The structure of sludge consists of fine particles which aggregates to mineral particles. The spaces between fine particles will be filled with water and air and these soil particles usually have negative charge.
 By adding MSC, MSC electrically neutralizes the negative charge of soil particles because MSC is a positive ion substance. During this time, capillary water combined with soil particles is separated. Then, interstitial water and a film of absorbed water will become free. By this hydrophobing phenomenon, soil particles will adsorb each other and the particle diameter becomes bigger, that leads to sedimentation. By adding the polymer flocculant, the diameter of flock gets bigger and it will settle down very fast.
 This flocculation sedimentation soil has large hydraulic conductivity by a hydrophobing phenomenon of soil particles. It enables to conduct effective dehydration of bottom sludge and will improve the dehydration of the soil easily.


By adding MSC to the bottom sludge or contaminated water, absorbed water film is destroyed due to hydrophobing. Also, capillary water between soil particles is separated and becomes free water. Separated soil particles adsorb each other, thus become gritty particles. In adding high-polymer coagulant, the diameter of flock gets bigger, and it settles down very fast. Flocculated soil particles are not mixed with water again. As a result, supernatant water can directly drain. By filtering with permeable mats, the water is easy to be separated. Flocculated soil has large hydraulic conductivity by hydrophobing of soil particles. Thus, it enables to conduct efficient dehydration in bottom sludge. Moreover, because soil particles are absorbed each other without capillary water, the bonding structure is strong and has large consolidation strength. As a result, the soil for landfill can be re-used for its good quality.
Raw sludge water before procesing MSC Added Polymer coagulant added Treated water

Specific characteristics of MSC method

1.Sedimentation Velocity:
 Flocculation sedimentation velocity with MSC is several times faster than conventional flocculant.

2.Separated water quality:
 Suspended substances (SS) and organic material in the water are separated by flocculation sedimentation and the separated water is purified as clean water.

3.Water content of flocculation on separated soil:
 Flocculation separated soil quickly becomes hydrophobic and they are able to be transportable water content by rapid drainage between soil particles.

4.Consolidation characteristics of flocculation separation soil:
 Flocculation separated soil becomes hydrophobic and interstitial water rapidly drains. The frame of soil particles itself is easy to be compressed and shows large coefficient consolidation .

 Since it does not contain toxic substance, the separated water, coagulation and sedimentation soil is safe and harmless to organisms, plants and environment.

Advantage in actual construction

1.Improvement on the dredger's operation rate:
 Since MSC method conducts the process that automatically provides MSC and polymer flocculant mixing them in the sludge pipes, it speeds up solid-liquid separation. Even in small capacity and when the flow-down distance is short to the sludge disposal pond, it can perform solidification fast in a short period of time. Good workability and can cut down dredging operation cost.

2.The early use of reclaimed land
 You can conduct initial sedimentation of dredging separation soil and self-weight consolidation more quickly than the conventional method.The soil can be easily taken out and transported by a dump truck. In addition, it enables to obtain high consolidation strength in the reclaimed land and landfill. You do not need to construct ground reform and you can use the dredged reclaimed land quickly.


 Principal component of MSC is iron salt (mainly ferric chloride) and metal salt (mainly aluminum sulfate), and MSC includes inorganic flocculant which is composed of alkaline rare earth element.

・Ferric chloride
・Aluminum sulfate
・Alkaline rare earth element

Special features and effects

 MSC destroys the film covering of fine particles that absorbs the water in the soil that composes the bottom mud. It is excellent in hydrophobization that releases a large quantity of free water in the soil particles. Hydrophobic fine particles absorb and combine together. These will become large particles and settles down quickly. After settling down, the particles gradually shrink and it exerts consolidation in accordance with the increase of the sludge volume. As a result, the water around soil particles is separated from soil particles and will become pure supernatant water.

1.Separated water becomes supernatant water as soil particles agglutinate and settle down quickly.
2.Increasing in hydrophobization and it is able to have space to store large quantity of separated soil in the processing areas due to large coefficient consolidation.
3.We can move to the second construction process early because of the consolidation the processing areas quickly dries out and coefficient of permeability is large.
4.The components included in the MSC is safe and will not affect the environment.
5.Separated soil is effective as a fertilizer and soil conditioner improved by the MSC's components (iron, potassium,calcium) and nutrient salts (nitrogen, phosphorus) in the bottom mud and microorganisms. Thus, the separated soil is effectively reused for agricultural soil.
6.Not only the hydrophobization of organic mud (sludge), but also MSC has an effect on aggregation sedimentation of toxic substance in the contaminated water.

The processing of the bottom mud

Effective utilization of separated soil

 Bottom mud piles up on closed water area of inland, stagnant river which has slow current and inner bays near the sea, causing water pollution. To improve this environment, the bottom mud is removed (dredging). Moreover, the dredging is generally conducted to secure water shortage and ship navigation.
 Dredging has been conducted in many water areas and resulted into a large amount of bottom sludge (dredged soil). To process bottom sludge, there are two ways to dispose. Disposal to the land and the other is disposal to the water.
 In the current condition, in order to enable to transport the dredged soil to the land by truck, we need to consider issues of dehydration and solidification. Also, there is the issue about deterioration of the surrounding environment on the truck's route. The disposal to the water discards at water side of a reclaimed land. Although a large quantity can be transported at once by ship, there are various problems such as environmental issues with the way of use of the reclaimed land. In the future, it is expected that it will be hard to secure the land to be reclaimed . It is necessary to effectively use the secured and reclaimed land.
 There are a lot of problems with these conventional constructions. Not only the problems with the sludge amount, but also the water applied by the dredging operation and it becomes mud water, disposed on the disposal land as it is, will require a lot of time for solid-liquid separartion so it will need a vast disposal site.

 Problems of conventional constructions

1.It is hard to decide the amount of soil that can be accepted in the disposal land.
2.Not economical because the soil amount with self-weight settlement during construction is difficult to know
3.As it can not figure out subsidence (soil-weight settlement) after the reclaimed construction, it is hard to expect soil stabilization.
4.It needs to be transported and disposed as industrial waste using solidification agent of cement materials.

 Merits of MSC method
1.It can determine exactly the amount of soil to be accepted.
2.It can figure out the amount of self-weight settlement and the amount of acceptable soil increases thus it is economical.
3.Strength of consolidation increases after the reclaimed construction. It does not need to consider soil stabilization, thus it is economical.
4.Separated soil is recycled and can be used because it is rich soil.

Prevention against bad odor
MSC Hyper
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