Kim, Junseok; Kim, Seongwon; Taleb, Tarik; Choi, Sunghyun ...
Yonghwan Kim
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Transcript of Yonghwan Kim
Yonghwan Kim
The potential for using rainwater to provide safe drinking water in rural areas:
a case study of Cukhe Village, Vietnam
Water Safety Conference 2010
Contents
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
1 Introduction
2
3
4
Installation
Conclusion
Suggestion
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
“Rain For All” ActivityObject Demo project for Sustainable water management in Asia
Site & Period Cukhe village in Vietnam, 16th Jan. 2010 ~ 26th Jan. 2010
Participants 14 students from Seoul National University & Hanoi University
RWH installation with local people & Curtural exchange between Korea and Vietnam
Cukhe Village
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Cukhe Village
Hanoi, Vietnam
12km
Poor village in rural areaNo centralized Water supply 3 water resources - Surface water, Ground water, Rainwater
Nhue river
Surface water
Pollution from domestic sewage
Ground water
Arsenic contaminated
Potential of Rainwater
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Temperature pH Turbidity EC As Cd Cu Fe(℃) (NTU) (mg/L)
Average 19.4 7.195 2.36 99 0 0 0.010 0.032
Standard6.5-8.5
2 0.05 1 0.3
Ni Pb Zn SO4 NO2 Br NO3 PO4
(mg/L)Average 0 0.004 0.097 2.238 1.04 0 1.862 0Standard 0.02 0.01 3 3Except for turbidity, all the chemical substances tested satisfy the
Vietnam water quality standards.→ We can drink rainwater after boiling.
Quality
Quantity
Abundant annual rainfall : 1,633 mm (Global average : 880 mm)
Sustainability of RWH
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Environment
Social Economy
Sustainable
Traditional water supply option
Half of households already using RWH
Low installing & maintaining cost
Require low energy
Low effect on environment
No chemical added to rainwater
Object
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
RWH has potential for drinking RWH has potential for drinking waterwater supply alternative supply alternative
•To check problems in existing RWHTo check problems in existing RWH
•To suggest To suggest technical improvement technical improvement forfor water quality water quality treatmenttreatment
•To confirm To confirm quantitative feasibilityquantitative feasibility of RWH system of RWH system
Promote RWH as a major drinking water supply Promote RWH as a major drinking water supply
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Existing Rainwater Tank
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Catchment
Storage tank
Gutter
Pipe
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Without filtering system → Containing many particles Unsealed Rainwater Tank → Exposed to dust, sunlight, and insect Water shortage during dry season
Existing Rainwater Tank
Quality treatment
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Filter Sedimentation tank
Catchment
Storage tank Plastic material designed for drinking purposes Isolating rainwater from external environment → Long term storage is possible
Polyethylene
Portable Catchment (3m(w) × 3m(l))
Asbestos- Harmful material
0.5mm sieve
Removing large particlessuch as leaves
Calm-inlet pipe → Preventing disturbance of settled part icle → Reducing kinetic energyRemoving small particles
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Quality treatment
Case 2. Portable catchmentCase 1. Roof catchment
Catchment area : 21 m 2
Tank capacity : 2 tCatchment area : 9 m 2
Tank capacity : 2 t
Quantity management
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Rainwater Ground water
Separate use of drinking water and domestic water
Sufficient capacity storage tankConcerning precipitation and demand : Capacity → 2t
Water for domestic use such as wash, shower, cleaning
Water for drinking and cooking
Collecting area
Volume of tank
Availabledemand
Number of cycles.
Availabledays
(m2) (t) (l/day) (days)
Case1 21 2 20 3.5 350
Case2 9 2 15 2.6 347
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
1. Existing rainwater tank satisfy quality except for turbidity. There is quantity problem in dry season.
2. Installing RWH with proper catchment, filter and sedimentation tank improves water turbidity. Residents feel safe drinking rainwater after boiling.
3. Using rainwater only for drinking and cooking make it possible to supply rainwater throughout the year.
4. RWHs can play an important role in providing a sustainable water resource and resolving water problem over the world
Conclusion
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
Hailuu elementary school
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
One Company One Rainwater Tank
5,000 USD From company
Technical assistance
Made by local people
Bottled water for each class(780 USD per year)
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia
First user is best user
Let’s make world that everyone feel happy
Water Safety ConferenceNovember 2-4 2010, Kuching, Malaysia