CURRENT SITUATION OF DRAINAGE SYSTEM AND STRATEGY

CURRENT SITUATION OF DRAINAGE SYSTEM
AND STRATEGY FOR WASTEWATER
MANAGEMENT OF DA NANG CITY
MAIN CONTENT
1. General introduction about Da Nang city
2. Current situation of wastewater drainage system
3. Current situation of wastewater treatment plant
4. Shortcomings of drainage system
5. Policy and strategy for wastewater management
DA NANG MASTER PLANNING TO 2030 & VISION TO 2050
1. GENERAL INTRODUCTION ABOUT DA NANG
 Is Grade 1 urban and centrally controlled municipality, the hub of the Central
Vietnam and Highland, with a strategic location for national urban development.
 Center of marine economy development, priorities for development of industry,
trade, service, tourism, banking and finance at national level.
The port city, an important national, regional, and international transportation and
telecommunications hub.
 Center of culture and sport, education and training, science and technology in the
Central Vietnam.
 One of the important strategic locations in national defense and security of the
South Central region, the Central Highlands and the whole country.
 Area: 1,255 km2
 Including 6 urban districts: Hai Chau, Thanh Khe, Lien Chieu, Cam Le, Son Tra,
Ngu Hanh Son
 And 1 rural district &
Year
Total population
1 archipelago district:
2000
687934
- Hoa Vang
2010
926018
- Hoang Sa
2013
967800
 Population size:
2030
2500000
2. HIỆN TRẠNG MẠNG LƯỚI THOÁT NƯỚC THẢI
 Sewage disposal system in Danang is mostly common drainage system. The
city's wastewater is collected in coastal interceptor sewers, river, lake margins
through the diversion wells (CSOs) at the outlets. Only a very small part of the
newly planning region has separate collection system to the waste water
treatment plant.
 Sewerage system: 15.7 km of gravity pipe, 19.4 km of the pressure line from the
pump station, 18 pumping stations, 60 diversion wells, most of the spillway
elevation + 0.6m above the sea level and the river level.
 Most households have septic tanks. For households with septic tanks, only a
small percentage of effluent was directly connected to the drainage system, and
the rest to seep directly into the ground from septic tanks.
 The quality of effluent from the septic tank BOD5 concentration is low, on
average about 100 mg / l.
 For wastewater from kitchen, bathing, washing, about 46% of households have
connection to the sewer system to the wastewater treatment plant.
 For wastewater from septic tanks, 8.7% of households have connection to the
sewer system to the wastewater treatment plant.
 Wastewater flow is about 75% of water flow (129 l / day).
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Layout of drainage and sewerage system
Pumping line
Wastewater treatment plants
(4)
WWTPs
(17,6 km)
River,
Sea
Pumping stations
(18)
Storm water
Combined Sewer Overflow CSO
(82)
Source
Tertiary sewers
(~300 km)
Storm water
From septic tank
Overflow waste water
Septic
Tank
Septic Tank
Combined Sewerage
System
Secondary Sewer
& trunk sewer (~400km)
Sewerage System
CSOs: 82
Gravity pipe: 17 km
Force mains: 17,6 km
Pumping Station: 18
WWTP: 4
The Existing Drainage & Wastewater System
Septic tank
Septic
tank
Overflow
Diversion chamber
Wall against tide, top +0.60 m
River/sea
Screen
Floor grit
Pumping
station
Drainage pipe
Flap valve
Septic tank
Wastewater pipe
Raising main
Rainwater
Rainwater
Septic tank
Gas to flaring
Rainwater
Septic tank
Screenings to landfill
Rainwater
Septic tank
Sludge to landfill
WWTP
Anaerobic lagoons
Sludge to landfill
River
sewage diversion structure
WW LAGOON
PUMP STATION
MODEL AND PRINCIPLE OF OPERATION
Pump station –
Board
Controller
steel-enforced
concrete, ĐK
(2.4-6.0)m
Pump
tube
Alarm level
Pump 2
Pump 1
Backup pump
Highest operating
water level
Wastewater
Wastewater
Operating
water level of
pump 2
Operating
water level of
pump 1
Lowest operating
water level
Pump machine
– 30-250 l/s
- Pumping stations were placed underground.
- Automatic operation according to pre-set programming.
PUMP STATION
SOME PHOTOS
3. CURRENT SITUATION OF WASTEWATER TREATMENT PLANT
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3. CURRENT SITUATION OF WASTEWATER TREATMENT PLANT
 Domestic wastewater: 4 wastewater treatment plants with anaerobic
technology (old technology)
+ Hoa Cuong WWTP: Area 4.5 ha - Capacity 36,000 m3/day
+ Phu Loc WWTP: Area 4.5 ha - Capacity 33,000 m3/day
+ Son Tra WWTP: Area 2 ha - Capacity 15,000 m3/day
+ Ngu Hanh Son WWTP: Area 1.6 ha - Công suất 11.500 m3/day
 Industrial wastewater:
* Industrial zones (IZ) with WWTP:
+ Hoa Khanh IZ (Lien Chieu district): Capacity 5,000 m3/day
+ Da Nang IZ (Son Tra district): Capacity 2,500 m3/day
+ Da Nang Fisheries IZ (Son Tra district): Capacity 2,500 m3/day
+ Hoa Cam IZ (Cam Le district): Capacity 2,000 m3/day
+ Lien Chieu IZ (Lien Chieu district): Capacity 2,000 m3/day
* Industrial Zone without WWTP:
+ Extended Hoa Khanh IZ (Lien Chieu district)
 Hospital wastewater:
+ About 40% of hospitals in Da Nang have WWTPs, in which a few
hopsitals have standard WWTPs.
+ Most big hospitals have WWTPs.
WW TREATMENT PLANT
Channel
Gas collector
Saved in 3 days
Effluent pipe
HDPE liner
7m
Influent pipe
OPERATION PROCESS
5m
Concrete layer
GCL layer
Compacted soil layer
3. CURRENT SITUATION OF WASTEWATER TREATMENT PLANT
(ESTIMATED OUTPUT QUALITY OF 4 DOMESTIC WASTEWATER TREATMENT PLANTS IN 2013)
Influent = Inf
Effluent = Eff
4. SHORTCOMINGS OF DRAINAGE SYSTEM AFFECTING
ENVIRONMENTAL SANITATION
 The city's wastewater is collected in coastal interceptor sewers, river, lake margins
through the diversion wells (CSOs) at the outlets. These outlets are frequently
affected by tides, sand filled CSOs, wastewater is often discharged to the sea,
rivers, lakes causing pollution.
 Current technology of wastewater treatment plants is backward (treated with
anaerobic technology), treated wastewater is not ensured with regulation before
discharge into the environment, bad odor in the treatment plants.
 Common sewerage system is downgraded, groundwater infiltration into the sewer
flow to the wastewater treatment plant.
 The percentage of household connections to the city’s sewer system is not high.
5. POLICY AND STRATEGY FOR WASTEWATER MANAGEMENT







Following the roadmap of wastewater management strategy of Da Nang towards
2020 and orientation towards 2040, Environmental City Plan towards 2020 has
approved the main points as follows :
100% wastewater of industrial and export processing zones with ensured quality
Construction of centralized wastewater treatment systems meeting
environmental standards in all industrial zones to reduce environmental
pollution caused by wastewater from IZs
100% domestic wastewater of all districts will be collected and processed to
ensure environmental standards
50% construct completely separate drainage system
Upgrading 4 existing urban wastewater treatment plants, building Hoa Xuan and
Lien Chieu wastewater treatment plants with advanced technology, complete
water collection pipelines along coastal areas, rivers, lakes, canals to collect the
whole city’s wastewater to the treatment plant
100% damaged culverts will be renovated or newly replaced
Perfecting mechanisms and policies, building capacity for the management and
operation of sewerage systems to achieve the highest efficiency ...
Thank you