7th International Forum on

Green Technology and Management

NEW APPROACHES AND SOLUTIONS IN ENVIRONMENTAL

PROTECTION TOWARDS SUSTAINABLE DEVELOPMENT

Hanoi, October 25-26, 2017

SPONSORS :

analytikjena

Việt Nam

7th INTERNATIONAL FORUM ON GREEN TECHNOLOGY AND MANAGEMENT 2017 “NEW APPROACHES AND SOLUTIONS IN ENVIRONMENTAL PROTECTION

TOWARDS SUSTAINABLE DEVELOPMENT”

October 25-26, 2017 at Institute of Environmental Technology, Hanoi, Vietnam

WELCOME!

It is an immense pleasure for us to welcome you to the 7th International Forum on Green

Technology and Management (IFGTM 2017) which is held in Hanoi capital of Vietnam.

The International Forum on Green Technology and Management (IFGTM) is an annual event

organized by the Consortium for Green Technology Management and Research (CGTMR).

Participating in the Consortium, there are 16 members coming from top universities in Vietnam

and overseas. There have been so far six IFGTMs held in Da Nang (2011) in Ho Chi Minh City

(2012), in Ha Noi (2013), in Can Tho (2014), in Hue (2015) and in Binh Duong (2016).

This year, the 7th International Forum on Green Technology and Management (IFGTM 2017)

is hosted by Institute of Environmental Technology, Vietnam Academy of Science and

Technology (IET-VAST) from 25th to 26th October 2017. With the theme “New Approaches and

Solutions in Environmental Protection Towards Sustainable Development”, the 7th IFGTM is a

positive and effective forum for researchers and managers to exchange ideas, share

approaches and empirical experiences in environmental protection. The conference topics

mainly focus on the aspect “Green technology and management” which has been considered as

driving force for sustainable development in the period of industrialization, modernization and

international integration.

The 7th international conference is expanded to facilitate universities, research institutes,

offices of science, departments, magazines, publishers and scientists both in the country and

overseas to participate. Also, this is a good opportunity for scholars to publish their research

findings in a Special Issue of Journal of Science and Technology of Vietnam Academy of

Science and Technology.

With the agreement of the Consortium for Green Technology Management and Research,

IFGTM 2017 continues to cover a broad range of many topics relate to environmental

engineering and management.

With the theme “New Approaches and Solutions in Environmental Protection Towards

Sustainable Development”, research areas of particular interest for the IFGTM 2017 include:

o Solid and hazardous waste management;

o Wastewater and water treatment;

o Air pollution control;

o Climate change;

o Monitoring, analysis and modelling in environment engineering;

o Reduce - Reuse - Recycle;

o Biodiversity and agricultural environment;

o Environment of coastal area.

Once again, it is our pleasure and honour to welcome all of you to the 7th IFGTM and

contribute in the success of the event.

IFGTM 2017 ORGANIZERS

Organizing Committee Scientific committee

Chair of committee:

Prof.Dr. Huynh Trung Hai (HUST)

Deputy of committee:

Assoc. Prof. Dr. Trinh Van Tuyen (IET-VAST)

Members:

Assoc. Prof. Dr. Nghiem Trung Dung (INEST-

HUST)

Assoc. Prof. Dr. Nguyen Phuoc Dan (FE-

HCMUT)

Assoc. Prof. Dr. Tran Van Quang (FE-DUT-DU)

Assoc. Prof. Dr. Nguyen Viet Anh (IESE-NUCE)

Dr. Duong Van Hieu (DES-HUSC)

Dr. Ho Dac Thai Hoang (IREN-HUEUNI)

Dr. Nguyen Tran Dien (IET-VAST)

Assoc. Prof. Dr. Nguyen Van Cong (CENRes -

CTU)

Assoc. Prof. Dr. Nguyen Thanh Binh (TDMU)

Dr. Pham Minh Tuan (FBEE - HUFI)

Assoc. Prof. Dr. To Thi Hien (FE-HCMUS)

Assoc. Prof. Dr. Nguyen Xuan Hai (FE-VNU-

HUS)

Dr.Vo Chau Tuan (EN-UED-UDN)

Assoc. Prof. Dr. Le Quoc Tuan (FBES-NLU)

Assoc. Prof. Dr. Tran Viet Nga (FE-NUCE)

Secretariat:

Dr. Nguyen Duc Quang (INEST-HUST)

Dr. Duong Thi Hanh (IET-VAST)

MSc. Hoang Thi Thu Hang (IET-VAST)

MSc. Vu Le Minh (IET-VAST)

Assoc. Prof. Dr. Nguyen Viet Anh (IESE-

NUCE)

Assoc. Prof. Dr. Nguyen Thanh Binh (TDMU)

Assoc. Prof. I-Ming Chen (ERM-CNU)

Assoc. Prof. Dr. Nguyen Hoai Chau (IET-

VAST)

Assoc. Prof.Dr. Nguyen Van Cong (CTU)

Assoc. Prof. Dr. Nguyen Phuoc Dan (FE-

HCMUT)

Assoc. Prof. Dr. Nghiem Trung Dung (INEST-

HUST)

Dr. Nguyen Tran Dien (IET-VAST)

Prof. Shigeo Fuji (GSGES-KU)

Prof.Dr. Huynh Trung Hai (HUST)

Assoc. Prof. Dr. Nguyen Thi Ha (FE-VNU-

HUS)

Assoc. Prof. Dr. To Thi Hien (FE-HCMUS)

Assoc. Prof. Dr. Ha Ngoc Hien (IET-VAST)

Assoc. Prof. Dr. Nguyen Thi Hue (IET-VAST)

Assoc. Prof. Dr. Hoang Thi Thu Huong (INEST-

HUST)

Assoc. Prof. Dr. Nguyen Manh Khai (FE-VNU-

HUS)

Prof.Dr. Dang Dinh Kim (IET-VAST)

Dr. Jae-chun Lee (KIGAM, Korea)

Dr. Pham Khac Lieu (DES-HUSC)

MSc. Doan Ngoc Nhu Tam (DER - UTDM)

Assoc. Prof. Dr. Che Dinh Ly (DER - UTDM)

Assoc. Prof. Dr. Tran Viet Nga (FE-NUCE)

Assoc. Prof. Dr. Tran Van Quang (FE-DUT-

DU)

Dr. Mikiya Tanaka (AIST-Japan)

Prof.Dr. Nguyen Thi Kim Thai (FE-NUCE)

Assoc. Prof. Dr. Trinh Thanh (INEST-HUST)

Assoc. Prof. Dr. Trinh Van Tuyen (IET-VAST)

Dr. Nguyen Tien Vinh (UTS-Australia)

Prof.Ming-Chun Lu (GTM-ERM, CNU)

CONFERENCE PROGRAM IFGTM 2017

Wednesday, October 25th, 2017

9:00 – 12:00 Registration

13:30 – 17:00 Technical tour: Visit Ho Tay Waste Water Treatment Plan

Cultural tour: Visit Bat Trang Village, Eco-park

Thursday, October 26th, 2017

8:00 – 8:30 Registration

8:30 – 8:45 Opening session

Welcome and Introduction

Opening speeches:

- Prof. Acad. Chau Van Minh, Resident of VAST;

- Assoc. Prof. Dr. Trinh Van Tuyen, Director of IET;

- Assoc. Prof. Dr. Huynh Trung Hai, Leader of CGTMR

8:45 – 10:45 Plenary session (*)

10:45 – 11:00 Coffee Break

11:00 – 12:20 Oral presentation (**)

12:20 – 13:30 Lunch time

13:30 – 14:00 Exhibition of Posters

14:00 – 16:30 Oral presentation (***)

16:30 - 17:30 Closing general session and Introduction of new CGTMR

observer members

18:30 Gala dinner for all attendants

Conference venue:

Institute of Environmental Technology, Vietnam Academy of Science and Technology

Address: A30 Building, No. 18 Hoang Quoc Viet road, Cau Giay district, Hanoi, Vietnam

Tel: 02432121321/ 02437569136

Plenary session (*)

Chairs: Prof. Huynh Trung Hai, Assoc. Prof. I-Ming Chen

Assistant: Dr. Nguyen Duc Quang

Venue: The Main Hall, Institute of Environmental Technology

8:45 – 9:15 Environmental management and solutions to strengthen

management effectiveness in the field of environmental protection in

Vietnam

Dr. Hoang Van Thuc, Deputy Director General of Vietnam Environment

Administration, (VEA/MONRE)

9:15 – 9:45 Environmental technologies of EMRI, AIST

Dr. Atsushi OGATA, Deputy Director of Environmental Management

Research Institute - National Institute of Advanced Industrial Science and

Technology, (EMRI/AIST)

9:45 – 10:15 Some phytoremediation applications for wastewater and heavy metal

contaminated soils in Vietnam

Prof. Dr. Dang Dinh Kim, Institute of Environmental Technology -

Vietnam Academy of Science and Technology, (IET/VAST)

10:15 – 10:45 Research activities of Can Tho University in the fiel of environmental

protection in the Mekong River Delta

Assoc. Prof. Dr. Nguyen Van Cong, Can Tho University (CTU)

Oral presentation (**)

Chairs: Assoc. Prof. Trinh Van Tuyen, Dr. Atsushi OGATA

Assistant: Dr. Nguyen Thanh Dong

Venue: The Main Hall, Institute of Environmental Technology

11:00 – 11:20 Long term operation of a pilot scale water treatment plant using

trickling filter coupled with ozonation for mitigation of potential

THMs formation from Saigon

Assoc. Prof. Nguyen Phuoc Dan, Director of Faculty of Environment and

Natural Resources, Ho Chi Minh City University of Technology, (HCMUT)

11:20 - 11:40 Characteristics of household solid waste in Hue City

Dr. Duong Van Hieu, Head of Department of Environmental Science –

College of Sciences, Hue University, (HUSC)

11:40 – 12:00 Microalgae: Prospects for a greener future

Assoc. Prof. Doan Thai Yen, School of Environmental Science and

Technology – Hanoi University of Science and Technology, (INEST)

12:00 – 12:20 Application of Anaerobic Membrane Reactor treating high-strength

wastewater in Hanoi City

Assoc. Prof. Tran Viet Nga, Dean of Department of Environmental

Engineering Hanoi University of Civil Engineering, (NUCE)

Oral presentation (***)

Session 1: Wastewater and water treatment

Session 2: Monitoring, analysis and modeling in environment engineering

Session 3: Biodiversity and Climate change

Session 4: Air and Solid waste treatment

SESSION 1 - WASTEWATER AND WATER TREATMENT (14:00 – 16:30)

Chairs: Assoc. Prof. To Thi Hien, Assoc. Prof. Nguyen Manh Khai

Assistant: Dr. Nguyen Tuan Minh

Venue: The Main Hall, Institute of Environmental Technology

14:00 – 14:25 Removal of refractory organic compounds using physicochemical treatment

Toshiyuki HIBINO, Nobuyuki TAKAHASHI

14:25 – 14:50 Application of electro-coagulation for treatment of wastewater from package

printing process

Nguyen Thi Thuy, Chu Thien Bao, Đao Xuan Son, Uong Đinh Bao, Dang Van

Thanh, Nguyen Nhat Huy

14:50 – 15:15

Development of Nitrogen and Phosphorus Removal from Piggery

wastewater using Microalgae-Bacteria Consortium

Ngo Van Chien, Nguyen Anh Vu, Vu Ngoc Thuy, Doan Thi Thai Yen, Miyashita Hideaki

15:15 – 15:35 Coffee break

15:35 – 16:00 Study of some parameters responsible for glyphosate herbicide

mineralization by electro – fenton process

Thanh Son Le, Tuan Duong Luu, Tuan Linh Doan, Manh Hai Tran

16:00 – 16:25 Estimation of biodegradable material concentrations in the sewage using

Iwa activated sludge model

Chanh Quang Nguyen Duong, Mitsuharu Terashima, Hidenari Yasui, Tuan Van

Le, Ha Thi Nguyen, Chieu Van Le

SESSION 2 –MONITORING, ANALYSIS AND MODELING IN ENVIRONMENT

ENGINEERING(14:00 – 16:30)

Chairs: Assoc. Prof. Hoang Thi Thu Huong, Dr. Duong Van Hieu

Assistant: Dr. Nguyen Thi Phuong Mai

Venue: Room 214, Institute of Environmental Technology

14:00 – 14:25 Aerosol pH in Ho Chi MinhCity, Vietnam

Duong Huu Huy, To Thi Hien, and Norimichi Takenaka

14:25 – 14:50 Preliminary assessmentof BTEX concentrations indoor and outdoor air in

residential homes in Hanoi, Vietnam

Vo Thi Le Ha, Nguyen Thi Thu Hien, Nghiem Trung Dung, Minoru Yoneda,Thai

Ha Vinh

14:50 – 15:15

Identifying the eutrophication status of shallow waters based on the

estimated trophic state index from satellite data

Nguyen Anh Bac, Nguyen Duc Viet, Nguyen Thi Thu Ha, Hoang Thi Thu Huong

15:15 – 15:35 Coffee break

15:35 – 16:00 Inhibitory effect of different euptoriumfortuneiturcz extracts on the growth

of microcystis aeruginosa

Pham Thanh Nga, Pham Huu Dien, Nguyen Van Quyen, Tran Hoai Thuong, Le

Thi Phuong Quynh, Nguyen Tien Dat, Duong Thi Thuy

16:00 – 16:25 Distribution and Exposure Assessment through Inhalation and Dermal

Pathways to Phthalates in Indoor Air Collected from Hanoi, Vietnam

Le Thi Hanh, Le Minh Thuy, Le Van Chieu, Dang Minh Huong Giang, Tran Manh

Tri, Tu Binh Minh

SESSION 3 – BIODIVERSITY AND CLIMATE CHANGE(14:00 – 16:30)

Chairs: Prof. Dr. Dang Dinh Kim, Assoc. Prof. Nguyen Thanh Binh

Assistant: Dr. Bui Thi Kim Anh

Venue: Room 212, Institute of Environmental Technology

14:00 – 14:25 The methane uptake capacity of soil garden

Stefan F. Arndt, Benedikt J. Fest, Phuong Linh Ngo

14:25 – 14:50 Using Benthos to evaluate the quality of marine environment: Case study

from central vietnam after the incident caused by Formosa

Nguyen Thi Minh Phuong, Nguyen Ngoc Anh, Ngo Quoc Phu

14:50 – 15:15

A review of seagrass studies by using satellite remote sensing data in the

Southeast Asia: Status and potential

Nguyen Thi Thien Huong,Tran Anh Tuan, Vo Trong Thach, Hoang Cong Tin

15:15 – 15:35 Coffee break

15:35 – 16:00 Fraction and determination of capsaicinoids from red pepper fruits with

insecticidal activity against mealworm, tenebriomolitor, and super worm,

zophobasmorio

NgaiThi Ngo, CuongTu Ho, DuyenThi Nguyen, Thu Thi Tran, Quang Le Dang

16:00 – 16:30 Introduction of some sponsors - companies

SESSION 4 – AIR AND SOLID WASTE TREATMENT (14:00 – 16:30)

Chairs: Prof. Nguyen Thi Kim Thai, Dr. Ho Dac Thai Hoang

Assistant: Dr. Le Thanh Son

Venue: Multi-function room, Institute of Environmental Technology

14:00 – 14:25 Assessment of effectiveness to reduce greenhouse gas emission of biogas

digesters in livestock manure treatment at Van Cu rice noodle craft village,

Thua Thien Hue province

Tran Thi Tu, Nguyen Dang Hai

14:25 – 14:50 Green growth prediction of Ho Chi Minh City by the grey theory model

Nguyen Hien Than, Doan Ngoc Nhu Tam

14:50 – 15:15

Occurrence of PAHs in the atmosphere and increase buring area in Hanoi

associated with the heath risk assessment

Van Dieu Anh, Ly Bich Thuy, Vo Thi Le Ha, Nguyen Duc Duy, Hoang Van Manh

15:15 – 15:35 Coffee break

15:35 – 16:00 Research on the ability of handling ammonia contaminated air stream by

activated carbon materials from coconut fiber (AC-1) and peanut husk (AC-

2), impregnated with ZnCl2

Nguyen Thi Kim Anh, Ho Nhut Linh, To Thi Hien

16:00 – 16:25 Bio-methane potential test for anaerobic co-desigestion of faecal sludge

and sewage sludge

Vu Thi Hoai An,Vu Thi Minh Thanh, Nguyen Viet Anh

Closing general session

16:30 – 17:30 Introduction of some sponsors - companies

Introduction of new CGTMR observer members

Introduction of IFGTM 2018 host

Closing Ceremony

18:30 – 20:00 Gala dinner

Meeting of Organizing Committee and leader of CGTMR member

Wednesday, October 25th

, 2017

16:00 – 17:30 Report about organization of IFGTM 2017

Speech of VAST’s representative

Introduction and signation of new CGTMR members

18:30 – 20:00 Dinner

Keynote Lecture #1

ENVIRONMENTAL MANAGEMENT AND SOLUTIONS

TO STRENGTHEN MANAGEMENT EFFECTIVENESS IN THE FIELD OF

ENVIRONMENTAL PROTECTION IN VIETNAM

Dr. Hoang Van Thuc

Deputy Director General of Vietnam Environment Administration

(VEA/MONRE)

Keynote Lecture #2

ENVIRONMENTAL TECHNOLOGIES OF EMRI, AIST

Dr. Atsushi OGATA

Deputy Director of Environmental Management Research Institute

National Institute of Advanced Industrial Science and Technology

(EMRI/AIST)-Japan

Presentation

Keynote Lecture #3

SOME PHYTOREMEDIATION APPLICATIONS FOR WASTEWATER

AND HEAVY METAL CONTAMINATED SOILS IN VIETNAM

Kim1 D.D., B.T.K. Anh2, T. V. Tua3, N.T. H. Ha4

1, 2, 3 IET, VAST; 4 VNU University of Science

ABSTRACT

Phytoremediation is the name of a set of technologies that use plants to degrade, extract, or contain contaminants from soil and water. Toxic heavy metals, organic pollutants and some inorganic elements are the major targets for phytoremediation.

It appears that phytoremediation could be the good technology for pollution treatment due to its cost-effective and eco-friendly nature.

- To promote the phytoremediaton application for heavy metal-contaminated soils in Vietnam, there have been several research programs conducted during the last decade. The studies identified two arsenic (As) hyperaccumulators, Pteris vittata and Pityrogramma calomelanos, and four grasses suitable for treatment of lead (Pb)- and zinc (Zn)-contaminated soils, Eleusine indica, Cyperus rotundus, Cynodon dactylon, and Equisetum ramosissimum, of which E. indica was found as Pb hyperaccumulator. All of these species are indigenous and naturally adapted to heavy metal contaminated habitats.

- Under field experimental conditions, the combination of P. vittata, P. calomelanos, and V. zizanioides (Ha Thuong Sn-Ti mining area) or P. vittata, E. indica and V. zizanioides (Tan Long Pb-Zn mining area) is very effective in treatment of soils contaminated with moderate concentration of As and Pb in short time. The combined utilization of P. vittata, V. zizanioides, and E. indica at Tan Long mining area, and P. vittata, P. calomelanos, and V. zizanioides at Ha Thuong mine site together with application of mycorrhiza fungi, EDTA, phosphorous, and organic fertilizers, showed very promising results. Concentrations of As, Pb, and Zn were significantly reduced over 3-year period. It can be concluded that the mixed cultivation of the selected plants can be used to remediate As-, Pb-, and Zn-contaminated soils.

- It appears that the degree of success in terms of contaminant removal efficiency by CW systems varies depending upon the plant species selected, availability of microbial community, climatic conditions, physico-chemical properties of soil, and CW configuration. It is well-established that nutrients (N and P), heavy metals, and COD can be successfully removed to a great extent by CW systems.

An Ecotechnology Model using aquatic plants (Phragmites australis, Vetiveria zizanioides, Cyperus alternifolius, and Eichhornia crassipes) was established in Hoa Binh province for treating piggery wastewater. This model is applied as a complimentary solution to treat the wastewater from piggery farm after microbiological treatment process. Surface flow technology, and subsurface flow technology combined with the floating plants were successfully applied. This Ecotechnology is suitable to Vietnam conditions and can be enlarged for livestock wastewater treatment after microbiological treatment.

Subsurface flow and free-water surface constructed wetland with more than 43,000 m2

has being applied in Ha Tinh province as a final step for treating wastewater of Formosa Ha Tinh Steel Corporation. It is noted that in this Phytotechnology, the indigenous well - known plants Phragmites australis, Typha angustifolia, and Cyperus tegetiformis are used. The operating CW indicates a good and stable feasibility of the phytoremediation application.

Keynote Lecture #4

RESEARCH ACTIVITIES OF CAN THO UNIVERSITY IN THE FIEL OF

ENVIRONMENTAL PROTECTION IN THE MEKONG RIVER DELTA

Assoc. Prof. Dr. Nguyen Van Cong

Can Tho University (CTU)

Keynote Lecture #5

LONG TERM OPERATION OF A PILOT SCALE WATER TREATMENT

PLANT USING TRICKLING FILTER COUPLED WITH

OZONATION FOR MITIGATION OF POTENTIAL THMs FORMATION

FROM SAIGON RIVER WATER

Le Ngoc Kim Ngan(1), Phan Bien Vinh Tan(2), Ho Le Phuoc Loc(1), Le Quang Do Thanh(1), Nguyen Minh Tri(1), Tran Kim Thach(2), Nguyen Nhat Huy(1), and Nguyen Phuoc Dan(1)

(1) Ho Chi Minh City University of Technology – VNU HCM (2) Saigon Water Supply Company (SAWACO)

ABSTRACT

A pilot scale trickling filter and ozonation contactor with capacity of 20 m3 d

-1 was run at

Hoa Phu Pump Station which takes raw water from Saigon River for drinking water supply

for Ho Chi Minh City. The raw water contains 0.52 ± 0.19 mgNH4+-N l

-1 , 0.14 ± 0.06 mg l

-1

total iron and 3.14 ± 0.45 mgDOC l-1

. The study aimed to using the pilot scale experiment to

assess ammonia, iron and dissolved organic carbon (DOC) removals from Saigon Water

River for the sake of reducing chlorine demand and thus mitigating risk from disinfection by-

products (DBPs) formation. The size of the trickling filter was 0.5 m length × 0.5 width × 2m

height. The bio-media was seven PE wool sheets with thickness of 30 mm that is widely

used as filter cloth in aquariums. It run at hydraulic loading of 3 m3 m

-2.h

-1 of raw water, and

8 m3 m

-2.h

-1, where 50% of total flow was the returned effluent of ozonation. The pilot scale

ozonation contactor which has the size of 0.6 m long x 0.6 m wide x 2.0 m high was

operated at contact time of 15 minutes and ozone concentration of 0.5 mg l-1

. The ammonia,

iron and DOC removals at 8 m3 m

-2.h

-1 were 58%, 25% and 22%, respectively. Whereas, it

obtained ammonia, iron and DOC removals of 52%, 19% and 9% DOC respectively. Thus,

even though the experiment with returned ozonation effluent run at high hydraulic loading

rate (4 m3 m

-2.h

-1of raw water), the better performance was obtained as comparison to the

experiment without return (3 m3

m-2

.h-1

of raw water). Formation potential of THMs

(THMFPs) reduced from 1206113 μg l-1

to 48554 μg l-1

, equivalent to THMFP reduction of

60%. Thus, the experiment shown that minimization of THMFPs had positive correlation to

removal of ammonia, iron and DOC using trickling filter coupled with ozonation. In practice,

total THM concentration that is formed after chlorination in the water treatment is much

lower than THMFP which is THM concentration formed at the contact time of 7 days and

under excess chlorine concentration.

Keynote Lecture #6

CHARACTERISTICS OF HOUSEHOLD SOLID WASTE IN HUE CITY

Tran Ngoc Tuan1,*, Le Van Thang1, Duong Van Hieu1, Le Quang Long1,2

1Facuty of Environmental Science, University of Sciences, Hue University 2 Hue Urban Environment and Public Works State Company

ABSTRACT

This paper examined the characteristics of domestic solid waste with a hope of

contributing to the improvement of solid waste management in Hue city. The study

was conducted by collecting, classifying and measuring domestic solid waste from

62 households in 7 consecutive days. A structure questionnaire was also used in the

interviews with survey households to collect data on their demographic

characteristics. The results show that the household solid waste was generated

evenly on a daily basis with an amount of 286±171g/person/day during the

weekdays. The composition of household domestic solid waste was divided into 17

different groups; of which, the two groups representing the largest amount were

food waste (56.35%) and garden waste (10.89%). Hazardous waste accounted for

a very small proportion (only 0.26%). The detailed composition ratio of food,

garden waste, nylon, paper, plastic, porcelain, etc. and mixed stuff were defined at

56.35%, 10.89%, 8.93%, 3.22%, 3.22%, 3.02%, etc. and 10,23%, respectively.

INSTITUTE OF ENVIRONMENTAL TECHNOLOGY Add. A30 Building, 18 Hoang Quoc Viet road, Cau Giay district, Hanoi, Vietnam Tel. (084) 24 3756 9136 Fax. (084) 24 3791 1203 Website: ietvn.vn