BSC Method Introduction (Biological Soil Crust Method) [PDF]

Zitiervorschau

Engineering Consultants

BSC Method

(Biological Soil Crust Method)

24th November 2021

1. Self-introduction

TANAKA Takaaki

Acting General Manager PSC Division Nippon Koei Jakarta Office

Work with PU “Access Priok Jalan Tol” Designed the alignment of 12km length in the urban dense area in Jakarta Utara. You can search “BP Highway” in YouTube.

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2. Slope Failure in BP Highway Many slope failure BP Highway (Sinduli Road), total 156km length, was completed in 2015. Even during the construction, many slope disaster were experienced due to heavy rain…

Before 2015, conventional method of slope protection, such as soil-seed vegetation, was adopted. But it took long time for vegetation to settle in the slope and lots of effort/cost were necessary to settle it. 3

3. New Technology Trial in BP Highway BSC (Biological Soil Crust) Method We developed a new technology for slope protection which called “BSC Method”. Trial-installation was done in 2020 for the location where no vegetation had grown in 5 years.

BSC area

Uncontroled Area

4m

 Almost no erosion  Vegetation recovered

 Erosion expand much  No vegetation

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3. What is “BSC” ?

Biological Soil Crust (BSC) BSC is a sheet-like colony of soil microbes formulated by soil particles and factures on the soil surface bound by filamentous bacterium, soil algae, lichens and moss 5

3. What is “BSC” ? The filamentous microalgae used for BSC method can be found in the whole world. Such type is called as cosmopolitan/universal species. Therefore, it has almost no adverse impact on environment (ecosystem).

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4. Slope Erosion VS Vegetation Shade trees layer

Vegetation Process

Intolerant trees layer

Shrub (intolerant trees) Moss, lichens

Perennial grasses Annual grasses

Start 1～2 yr

4～5yr

30～50yr

Over 150yr

If the slope erosion there, vegetation can not start. 7

4. Slope Erosion VS Conventional Vegetation Method (1) Seed by Hydroseeding Seed grows roots and leaves

But, Roots is cut by moving of soil particles Grasses withered Also, the small soil particles are washed out.  makes difficult for grasses to grow.

(2) Sheet/ mat Grass seed

Sheet/ mat Soil surface

Water runoff flows the space between sheet/ mat and soil surface and erodes the soil.  The eroded place becomes weak then, erosion there becomes bigger.  At the result, water-way is formulated, it gets bigger, then … sheet/mat can’t work to protect the slope, grasses can’t grow neither.

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5. How “BSC” protect the soil surface ?

Soil algae on soil surface binds soil particles and formulate sheet-like structure (BSC) Small block SoilSoil particle

surface flow BSC protects outflowing of soil surface and stop the process of erosion

Red Soil

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6. What is “BSC Method” ? Dry cultured microalgae to produce BSC material

Sand pump spray Generator

Nozzle

Spray mixed material

Main valve

Control valve Sub-valve

Tank Sand pump

Circulation for mixing material BSC liquid ( BSC-1, Fiber, Fertilizer, Water) 10

6. What is “BSC Method” ?

Water tank

Item 1. Water tank 2. Engine pump 3. Hose with mouth ring 4. Joint parts 5. Hand mixer (electric power)

Engine pump

Hose for sucking up water :5m

Hose for water spurting out: 10m

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6. What is “BSC Method” ?

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7. How is the result of “BSC Method” ?

Before spray

After 3 months

After 9 months 13

7. How is the result of “BSC Method” ? 1. Before

2. After spray

Any good solution …?

3. Vegetation

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7. How is the result of “BSC Method” ?

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8. How much is “BSC Method” ?

9. What are we looking for ?

 We are now looking for “ Trial Site ” in Indonesia.  We are now looking for a business partner.

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8. If you are interested in BSC Method … You can search “BSC method” in

. Contact in Indonesia: Nippon Koei Co., Ltd. Jakarta Office: Jl. Sultan Hasanuddin No. 45 Kubayoran Baru, Jakarta Selatan 12160 Indonesia

Takaaki TANAKA

Acting General Manager Email: [email protected] HP : +62 (0)811-889-0271

Hari Wahyudi

Marketing Officer Email: [email protected] HP : +62 (0)813-8826-7899

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