The effectiveness of Dried Water Hyacinth (Eichhornia Crassipes) Woven into Mat to Prevent Soil Erosion CHAPTER I Introduction
In times when torrential rains come pouring down on Earth, water is seeped through the ground thereby making it moist, causing it to loosen up. This gives a higher risk of probable soil erosion. Landslides are never new to the Philippines due to the fact that rain is present all year round. Fecund landslides also happen not only because of this natural process but also because of mortal deeds such as indiscriminate logging, illicit or even licit mining, deforestation, and the like. These lead not only to the devastation of material possessions amounting to millions of pesos but also to the life of folks of various races alike. Coping with such problems of soil erosion and landslides, there is a necessity to tackle this dilemma by applying organic materials of beneficial properties that can serve as substitutes for existing materials of this type- a material that can bear the mass of soil to prevent erosion. To date, there is an existing technology that uses coconut coir where it is placed on top of loose soil thus preventing erosion when rain comes. However, this existing solution of preventing soil erosion is not equitably accessible to Surigao del Norte folks due to the great demand of these materials for other products such as mats, bags and furniture not only in the local community but also for worldwide consumption. This “in demand” state of coconut fibers poses a crisis regarding the availability of the material and would thus result to setbacks regarding mass production. With such circumstances, the researchers seek to uncover an alternative material to coconut coir fiber mat for the prevention of soil erosion in as much as Surigao del Norte holds a lot of danger-prone areas specifically that of landslides mainly because of human activities such as mining. Water hyacinth ( Eichhornia Eichhornia crassipes crassipes ) is a fascinating material for investigation as a substitute for coco coir as expressed by its anatomy that is made up mainly of cellulose, hemicelluloses, and lignin, and is almost similar to coco coir. Furthermore, the said alternative is very abundant in the locality, relatively non-toxic, environment-friendly and of low cost. E. crassipes has not been investigated for its application as mats for possible utilization in landslide1
prone areas such s uch as the province of Surigao del Norte where massive mining activities are very rampant. This study will not only aid on solving problems on landslide-prone areas but also on the problem of massive population of water hyacinth in the locality which brings b rings a caustic effect to the marine ecosystem since it prevents light from reaching depth. Through water hyacinth’s engulfing presence, large amounts of sunlight are blocked, thorough oxygen exchange is prevented and dissolved oxygen levels drop, the food web is altered, habitat for water fowl and other organisms is either destroyed or changed, and the biological diversity of the invaded area is greatly reduced (Denny et al., 2001, Brendonck, 2003). Water hyacinth can be a problem economically as it negatively affects fisheries, slows or even prevents water traffic, impedes irrigation, reduces the water supply, obstructs obstructs water ways, ways, and slows hydropower hydropower generation (Denny et al., 2001, Brendonck, 2003). The positive aspects of the weed thus seem to outweigh its negative attribut es. Review of Related Literature
Water hyacinths ( Eichhornia Eichhornia crassipes crassipes ) are usually a few inches tall but some can grow up to 3 feet tall. This aquatic plant has spongy sp ongy and sometimes inflated stalks giving it high buoyancy which makes it float. The most anatomical feature of this plant is the presence of gas filled and passages in its roots, leaves and rhizome. Its air chambers are large, usually regular intercellular spaces
extending
through
leaf
and
long
distances
through
stem.
(http://plants.ifas.ufl.edu/node/141) Soil erosion can be brought about by either humans or natural processes. Humans cause soil erosion through deforestation. Without trees, the land cannot absorb as much rain water and soil is washed away. Effects of soil erosions are landslides which are very common worldwide calamity, in the Philippines in particular. The most recent landslide in the Philippines was in Pantukan Town in Compostela Valley on the island of Mindanao which happened last January 6, 2012. The stalks of water hyacinth (Eichhornia crassipes) are a viable natural source of alternative textile material, according to the Department of Science and Technology’s Philippine Textile Research Institute (PTRI). Processing the fibers with polyester staples initially produced blended yarns with 20 – 35 35 percent water hyacinth component. The stalks went through a series of
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chemical and mechanical treatment to achieve the crimp property of wool for better processing, reduce the plant’s glue-like glue-like or gum content, and soften the fibers to make them fine and fit for knitting
and
weaving
into
apparel
and
other
home
textiles.
(http://www.agribusinessweek.com/filipino-researchers-eye-water-hyacinth%E2%80%99s potential-as-a-natural-fiber-source/) According to Edera, et al. there is a significant difference of the biochemical oxygen demand of microorganisms found at Brgy. San Juan river with and without water hyacinth. The dried water hyacinth stalks in rope in Taganito water exhibit the relatively lower physically and chemically absorbed water which is important for app lication of this material in Taganito, Claver, Surigao del Norte landslide prevention (Gealan, et al. 2011). Findings of the study revealed that dried water hyacinth stalk has a high tensile strength. Lastly, according to Potiyaraj, et al. waterhyacinth reinforced natural rubber can be used in some applications when hardness and modulus is of importance, for example floor covering, shoe soles, or machine mounting. This will increase the market value of natural rubber, also reducing the water pollution caused by water-hyacinth plants. (http://research.sc.chula.ac.th/JSR26_1/paper%202.pdf)
Statement of the Problem
This study investigates the effectiveness of dried water hyacinth stalk fabricated into a mat in preventing soil erosion. Furthermore, the study seeks to answer the following questions: 1. Does sodium chloride and sodium metabisulfite affect the biodegradability of water hyacinth mat? 2. Is there a significant difference in the rate of soil erosion in areas with and without water hyacinth mat? 3. Is there a significant difference in the rate of biodegradation of water hyacinth mat which is untreated, treated with sodium chloride, and treated with sodium metabisulfite?
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4. Is there a significant difference in the load strength of untreated and treated water hyacinth mats?
Hypotheses
Problem 1 is hypothesis-free while problems 2, 3 an d 4 are hypothesized as follows: 2. Ha: There is a significant difference between the rate of soil erosion of the area without water hyacinth mat and the area with water hyacinth mat. 3. Ho: There is no significant difference in the rate of biodegradation of water hyacinth mat which is untreated and woven into mat, treated with sodium chloride and woven into mat, and treated with sodium metabisulfite and woven into mat. 4. Ha: There is a significant difference between the load strength of the treated water hyacinth mats and the untreated water hyacinth h yacinth mat.
Significance of the Study
If this study can prove that water hyacinth sta lk can be an effective alternative to coco c oir fiber mat in terms of its efficiency in doing its designated purpose, common and destructive environmental problems and disasters such as soil erosion and landslide can possibly be averted. As such, more lives and money can be saved, that, instead of using the money for rehabilitation after the disasters, it could be used for other more important purposes for the betterment of the country. Results of this study may also benefit farmers and agriculturalists such that they may use these products and information to prevent land surrounding their crops from corroding.
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Moreover, jobs can be provided to unemployed folks if ever this study would be proven effective. In as much as water hyacinth grows in large masses causing clogged water ways during rainy seasons, its usage and removal from the aquatic environment could help prevent floods. Scope and Limitation
This study will be limited in determining the efficacy of water hyacinth woven into mat in preventing soil erosion, and the biodegradability biodegradability of untreated water water hyacinth stalk and woven into mat, treated with sodium chloride water hyacinth stalk and woven into mat, and treated with sodium metabisulfite water hyacinth stalk and woven into mat.
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CHAPTER II METHODOLOGY Research Design
The design used in this study is the experimental design because experimental variables are chosen to fit the application intended for this study. Specifically, the Randomized Complete Block Design (RCBD) was used. used. Control setups (Sample A=untreated A=untreated water hyacinth stalk mat) which serves for comparative purposes and two expe rimental setups (Sample B=treated with sodium chloride water hyacinth stalk mat treated with sodium chloride, Sample D=treated with sodium metabisulfite water hyacinth stalk and woven into mat) as s hown in Table 1 Control Setup
Experimental Setup
A
B
C
Untreated Water
Water Hyacinth
Water Hyacinth
Hyacinth Stalk Mat
Stalk Mat Treated
Stalk Mat
with Sodium
Treated with
Chloride
Sodium Metabisulfite
Table 1. Research Design
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A. Gathering of Materials B. Preparation of Water hyacinth Stalks C. Fabrication of Water Hyacinth Mat D. Treatment of Mats E. Determination of physico-chemical properties of soil F. Application of Mats on Field
G. Load Strength Testing H. Biodegradability Testing
Figure 1. Schematic Diagram of the Procedure
PROCEDURES A. Gathering of Materials
Water hyacinths were gathered from Mainit, Surigao del Norte where these plants are prominent in rivers and lakes. The other materials that were used were knife, weighing balance, basin, gloves, standard masses, micrometer caliper and scissors. scissors. B. Preparation of Water Hyacinth Stalk
Water hyacinth roots and leaves were cut using scissors and discarded while the stalks were washed thoroughly with warm water then sun -dried for 3 days. C. Weaving of Mat
After drying the stalks, the weaving of mat followed. The dried water hyacinth stalks were hand-woven into a net using the same technique in weaving mats. D. Treatment of Mats
Three samples were prepared for comparison. Sample A was the untreated water hyacinth stalk mat. Sodium chloride was applied to Sample B while sodium metabisulfite 7
was applied to Sample C. Sodium chloride with 25% by weight and treated for 24 hrs. Sodium chloride was used for treatment because it is a natural preservative and is commonly used by fishermen to preserve abaca ropes used in artificial coral reefs. In the same manner, sodium metabisulfite with 25% by weight was also used for treatment same treatment for sodium chloride because it is used as a preservative agent and is commonly used to coat water hyacinth stalks to be manufactured as furniture.
E. Determination of physico-Chemical properties of soil (pH, OM, N, p, K, Ni content)
Soil samples were taken from the site and were brought to the Department of Agriculture for soil analysis.
F. Field Installation
Figure 2. Field Installation of Mats at THPAL
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Figure 5. Construction of Silt Collector
The mats (Sample A, B, C) were installed at Taganito HPAL Nickel Corporation (Figure -----) with a steepness of approximately 30°.Madre de caca os were planted on eac each h of the four corners of every mat to act ac t as the support frame/stakes. A canal was constructed at the bottom of the site to act as the silt collector of of the eroded soil.
Figure 6. Actual field layout of mats in THPAL
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FIELD LAYOUT
A
B
C
B
C
A
C
A
B
A
B
C
B
C
C
A
A
B
LEGENDS: A- Untreated B- Treated with sodium chloride C- Treated with sodium metabisulfite
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Figure 7. Close-up view of silt collector
Figure 8. Site lzyout
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G. Load Strength Testing
After the weaving and treatment of the mats, each sample was subjected to load strength testing to determine the amount of load it can carry without breaking. To act as support for the mat, three water hyacinth stalks were braided and fastened to 4 steel bars. Soil was then put on each mat (1ft x 1ft). The maximum amount of soil each mat was able to hold was measured.
Figure 9. Close-up view of mat supporter
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Figure 10. Setup for tensile strength testing
Figure 11. Actual load strength strength testing
H. Biodegradability Testing
Smaller mats with a dimension of 1ft by 1ft were also installed and left at the experimental site. These would serve as the basis for biodegradation. Ocular inspection was conducted once a week to check whether the mats exhibited signs of wear and tear.
Figure 12. 1ft by 1 ft mats
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Chapter III Results and Discussion
This research was conducted to test whether water hyacinth mat could be a potential alternative a lternative to existing technology that prevents soil erosion. As such, the researchers considered the breaking strength of the material. As shown in Figure 2, Sample C corresponding to the water hyacinth stalk mat treated with sodium metabisulfite had the highest load capacity among the samples exposed and unexposed to the field at 2.831 KPa and 2.122 KPa respectively. In all the samples, breaking strength was higher by 50. 5% (Sample A), 70.8% (Sample B) and 70.9% (Sample C) after
Breaking Strength (N/m2) 3
2.5
2 e l t i T s i x A
1.5
1
0.5
0
A
B
C
After installation
2.223
2.527
2.831
Before installation
1.718
1.819
2.122
exposure to the field for twenty one days. Figure 13. Results of Load Strength Testing
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RATE RATE OF SOIL EROSION(g/min) EROSION(g /min) 600
500
400
300 500 200
100 40
27.78
0 Area with with water water hyacinth hyacinth mat mat Area without without water hyacinth hyacinth mat
Area with coco coir mat
Figure 14. Soil erosion rate
As presented in Figure 14 above, average soil erosion rate in rain simulation test using hose was conducted for 15 minutes was higher in the area without mats at of 500 grams per minute, the area installed with water hyacinth mats had 40 grams per minute, while coco coir mat had 27.7 8 grams per day. The area with the existing existing coco coir proved to have a lesser soil erosion rate than the area with water hyacinth stalk mat, with a difference of 12.22 grams per minute.
Before Installation
After Installation
Untreated Water
Water Hyacinth Mat
Water Hyacinth Mat
Hyacinth Mat
treated with NaCl
treated with NaS2O5
35 kilograms
60 kilograms
60 kilograms
25 kilograms
40 kilograms
35 kilograms
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Table 1. Biodegradability Testing
Three weeks after, the mats showed a weight decrease. For the untreated water hyacinth mat (Sample A) there was a weight difference of 10 grams, mat treated with sodium chloride (Sample B ) had a difference of 20 kilogramsand the mat treated with sodium metabisulfite (Sample C) h ad a difference of 15 kilograms. Sample C (treated with Sodium metabisulfite) had the highest breaking strength, and was able to withstand the greatest mass compared to the other samples. This can be due to the fact that sodium metabisulfite inhibits the growth of wild yeast, and kills bacteria thereby preventing the fibers from rotting and breaking easily, while preserving the stalks by drawing water out of them. On the other hand, the lowest breaking strength in Sample A is probably caused by airborne bacteria and lack of preserving agents. Compared to the area installed with mats, both of coco coir and water hyacinth, the area without the mats had a higher soil erosion rate. However, the area with the existing coco coir proved to have a lesser soil erosion rate than the area with water hyacinth stalk mat. This is probably due to the smaller mesh of the coco coir mat, ranging from 0.5 to 1 inch, compared to water hyacinth h yacinth mat with a mesh size of 2 inches. Because of the smaller distance between each eye of the mat, more fibers are used. More fibers used means a greater breaking strength; and this is the very reason why coco coir mat is considered a standard nowadays. Two rainy nights (September 24 and September 25) that occurred throughout the observation period of 10 days. Regarding the biodegradability of the mats, it has been observed that after twenty days of being installed, the mats exhibited signs of mould growth. Sample A (the untreated mat) had more moulds compared to the treated mats, while Sample C had the least number of moulds, due to the fact that sodium metabisulfite acts as an antimicrobial.
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Recommendations Findings of the study reveal that dried water hyacinth stalk fabricated as mat and treated with sodium chloride and metabisulfite makes the mat stronger in terms of load capacity. Furthermore, based on the Load Strength test, exposure to the sun strengthens the mat. A continuing research on more additives to the mat to increase its efficiency and load ca pacity is recommended.
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