Decentralized
Domestic Wastewater Treatmentin Thailand
Pannapat Chuncharoensook
Director of Wastewater Management Department 2---------------------------------------------------Wastewater Management Authority
333 Lao Peng Nguan Building, 24th Fl.
Vibhavadi Rangsit Road, Chomphon, Chatuchak
Bangkok 10900, Thailand
E-mail: pannapat.c@wma.mail.go.th
Website : http://www.wma.or.th1

Table of Contents••
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Thailand Environmental Laws
Central Domestic Wastewater Treatment Plant in Thailand
Surface Water Quality in 2018Current Situation of Domestic Wastewater in Thailand
On-Site Treatment Facilities and Central Domestic WTP
Capacity of Septic Tank
Wastewater Management Authority (WMA)WMA Projects
Small Scale Wastewater Treatment System
WMA Future Steps

2

Thailand Environmental Laws

The Enhancement and Conservation of National Environmental Quality Act
Download document
B.E. 2535 (1992)
consists of(1) Air and Noise Pollution(2) Water Pollution(3) Other Pollution and Hazardous Waste3

Central Domestic Wastewater Treatment Plantin Thailand
Thailand Population = 69.04 million
Total Provinces

76

Total Local Governments

7,852

Total Owner of Central
Domestic WTP

91(1.16% of Total Local Governments)

Total Central Domestic
Wastewater Treatment
Plant

105

Location of 105 Central
Domestic Wastewater
Treatment Plants

Download picture4Surface Water
Quality in 2018
The results of testingwater quality from• 59 majors rivers• 6 standing water sources

5Current Situation of Domestic Wastewaterin Thailand
Pollution Sources : Residential, Markets, Offices, Hotels etc.
7,852 Local Governments
Quantity 9.50 million (100%) m3/day

7,761 Local Governments

91 Local Governments6.30 million (66.32%) m3/day

3.20 million (33.68%) m3/day

105 Central Domestic WTP
Water Bodies

Water Bodies

6

On-Site Treatment Facilities
and Central Domestic WTP

Water Bodies
 Water Quality
Standard

Central Domestic Wastewater
Treatment Plant
Grease Trap

Grit Chamber Water Quality
Standard

Kitchen

Water Bodies

ToiletSeptic Tank

Public Sewer Pipe

 Water Quality
Standard
7

Capacity of Septic Tank

lpcd = litre per capital per day
Sources : Aqua Nishihara Corporation limited

8

Wastewater Management Authority (WMA)
State enterprise established under the Royal Decree Establishing theWastewater Management Authority B.E. 2538 (1995) on 15th August 1995
The organization previously operated under the Ministry of Science, Technologyand Environment (MOSTE) and was transferred to the Ministry of NaturalResources and Environment (MONRE) on 3rd October 2002.
Recently, WMA is administered under the Ministry of Interior (MOI) since 23rd
November 2018.

WMA vision
Manage domestic wastewater to meet the water quality standard withsustainability within the year 2026
9WMA Projects(1) Long term project to provide wastewater treatment system rehabilitation andmanagement to 25 local governments. (26 of 105 existing Central Domestic
Wastewater Treatment Plants)(2) Construction and management of 19 small scale wastewater treatment systems.
(19 local governments)(3) Operation and management of wastewater treatment system in the project areas
under Royal Initiatives. (7 systems of 4 local governments and 1 organization)

10

WMA Projects
Pollution Sources : Residential, Markets, Offices, Hotels etc.
7,852 Local Governments
Quantity 9.50 million (100%) m3/day

7,761 Local Governments

91 Local Governments

6.30 million (66.32%) m3/day

3.20 million (33.68%) m3/day

(2)
(3)

WMA Projects(1)
105 Central Domestic WTP

Water Bodies

Water Bodies

11Small Scale Wastewater Treatment System
Conceptual Designระบบบําบัดนําเสี ย Public acceptance Appropriate budget forconstruction, operateand maintenance Water Quality Standard Water reuse DecentralizedSequential Batch Reactor (SBR)
Pumping Station
Influent

Underground Structure

Bar Screen(2) Mixing (Denitrification)(1) Filling(3) Aerate (Nitrification)

TreatedWater(5) Discharge
Wastewater Pump

(4) Settle
13

Activated Sludge/Fixed Film
Pumping Station
Influent

Underground Structure
TreatedWater

Bar Screen(1) Equalization Tank

(2) Aeration Tank

(3) Sedimentation Tank

Return Sludge
Wastewater Pump14

WMA FutureSteps(1) Expand Wastewater
Management Area.
(2) Construction andManagement of 764 small
Scale Wastewater treatment
Systems. (448 local
governments )15