Sewerage Systems Office-Sewage Treatment Plants-Neihu Sewage Treatment Plant Introduction

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Neihu Sewage Treatment Plant Introduction

The construction of the Neihu Sewage Treatment Plant started in February 1998. After completion and successful function test in May 2003, the plant entered formal service and operations in 2004. The design capacity of Phase-1 construction was 150,000CMD; after completion of the Phase-2 construction in 2016, the design capacity increased to 240,000CMD.

It mainly functions for handling the sewage of Neihu and Dazhi areas and part of New Taipei City’s Xizhi area, and for regulating sewage flow of the Xizhi-Nangang Trunk; via the cross Keelung River connection pipeline, it also exerts an interactive flow regulation with the Dihua Plant by sending sludge to Dihua Plant for centralized treatment and for lowering the cost.

The Neihu Plant adopts Class-2 Biotreatment, where treated water is discharged into the Keelung River after sodium hypochlorite disinfection; part of treated water is recycled for re-use after passing through a mechanical filter system and Ultrafiltration (UF) system, used for washdown and irrigation within the plant as well as for civilian plantations and street washdowns.

A sports park of 3.8 hectare area is established, facilities include public arts, water pools, rock climbing field, extreme sports setup, etc.

Plant Address: No.2, Jiuzong Road Sec. 2, Neihu District, Taipei City
Tel: (02)87919494
Fax: (02)87919746

Sewage Treatment Flowchart

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After entering the plant, the sewage passes through a Bar Screen and Sedimentation Pool for removing debris, sand and gravel from the water protecting pumps; it then enters the Primary Clarifier for removing part of organic substances and most suspended solids from the water.
The supernatant from the Primary Clarifier then enters the Class-2 Biotreatment Unit (in Stepped VIP) and then the Secondary Clarifier, for sedimentation; after that, the treated water is disinfected with sodium hypochlorite to remove germs and becomes the effluent before being discharged into the Keelung River.
Effluent from the Class-2 biotreatment is disinfected with sodium hypochlorite; part of it is filtered by automatic filters and the Ultra-Filtration System for recycled use in the plant, as well as for external use, for maximum recycling .
Starting from 2007, sludge separated from the primary and secondary clarifiers have been incorporated into the process of the Dihua Sewage Treatment Plant via a dedicated pipeline and sieve dregs are hauled to incinerators for incineration.
In order to prevent odors of hydrogen sulfide and ammonia from affecting operators in the plant and causing air quality and environmental issues to nearby residents, the exhaust gas is collected with ducts and treated by wet chemical cleansing and odor removal facilities before being released into the atmosphere, thereby complying with air quality requirements of the environment.

Facility Floorplan
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Main Treatment Facilities List

Item	Facility Name	Quantity	Description
1	ADM Building	1	L 52m, W 25m, above ground H 14m 3 levels above ground, 1 level underground
2	Mechanical Coarse Bar Screen	4	Horsepower: 5 HP Pitch: 50/38 mm Channel Width: 2.2 m Voltage: 3-ph, 380 V, 60 Hz Type: Rack-type and rotary type bar
3	Intake Pump	5	Horsepower: 500 HP (350 kW) Lift: 18.5 M Flow Rate: 83.4 M3/min Rotation Speed: 710 RPM Voltage: 3-ph, 6.9 KV, 60 Hz
4	Bypass Pump	2	Horsepower: 500 HP (350 kW) Lift: 18.5 M Flow Rate: 83.4 M3/min Rotation Speed: 710 RPM Voltage: 3-ph /6.9 KV /60 Hz
5	Mechanical Fine Bar Screen	5	Horsepower: 5 HP Pitch: 6 mm Channel Width: 2.2 m Voltage: 3-ph /380 V/60 Hz Type: Rotational self-clean bar type
6	Primary Clarifier	8	Pool Size: L 56m, W 11.5m, D 4m Overflow Rate: 47.6CMD/㎡ Each pool has longitudinal chain scraper and scum collection device
7	Centrifugal Blower	8	Horsepower: 600 HP（450 kW） Rated air flow: 270 m3/min Rated pressure: 765 mbar Rotation Speed: 3550 RPM Voltage: 3-ph/6.9 KV/60 Hz
8	Roots Blower	3	Horsepower: 150HP Rated air flow: 70 m3/min Rated Pressure: 0.6 kg/cm2 Rotation Speed: 1450 RPM Voltage: 3-ph/ 380 V/60 Hz
9	Bioreactor	12	Pool size: L 58m, W 6m, D 6.5m Step VIP method is used Hydraulic retention time 5.7h
10	Secondary Clarifier	16	Pool Size: L 50m, W 11.5m, D 5m. Overflow Rate: 33 CMD/㎡ Solid load rate: 3.9 kg/㎡/h Each pool has longitudinal chain scraper and scum collection device
11	Chlorination Disinfector	2	Contact Chamber Canal: L 120m, W 3.5m, D4m Contact chamber canal: L 120m, W 3.5m, D4m Dosing Tank: RC tank x3, 8m×4m×3.5m Hydraulic Retention time: 0.8min (mixing tank), 30min(Contact Chamber Canal) Dosing Tank Capacity: 120m3
12	Effluent Pumping Station	1	Wet Well L 14.5m, W 14.2m, D 4.7m Pump x4, 120,000CMD each Gate x3, moisture-proof tongue valve
13	Effluent Pump	4	Horsepower: 350 HP Lift: 11.7 M Flow Rate: 83.4 M3/min Rotation Speed: ≦1200 RPM Voltage: 3-ph/6.9KV/60Hz
14	Recycle Pumping Station	1	Wet Well L 20.8m, W 20.5m, D 6m Pump x5, 2,000CMD each Automatic Filter x2
15	UF System	2	Design Flow: 100 CMD Pore Dia.: 0.04 uM Voltage: 3-ph/380 V/60 Hz
16	Sludge Thickener	3	Each with belt-filter concentrator, belt width 2m Operating Method: Continuous 16h/d Concentrate Sludge: SS content≧50,000mg/L Solid Capture Rate: ≧95%
17	Sludge Dehydrator	3	Each with belt-filter concentrator, belt width 2m Operating Method: Continuous 16h/d Dehydrated sludge cake: SS content ≧200,000mg/L Solid Capture Rate: ≧95%
18	Deodorizing Chamber	2	Deodorization Chamber (I): L 26.3m, W 18.3m, H 18.6m Remove all the organic and inorganic odor produced in the plant area 2-stage horizontal cross-flow scrubber x2
19	Sub-station and Power Generator Room	1	L 40.8m, W 24.7m Diesel Generator x4 For providing emergency power and lighting in the plant area Diesel Generator in parallel connection, (1500kW 6.9kV 60Hz)

Carbon Footprint Label

Neihu Sewage Treatment Plant obtained a Product Carbon Footprint Label Certificate issued by Environmental Protection Administration, Executive Yuan on February 24, 2023, carbon emission is 280g CO2e/m3, manifesting the endeavors made for protecting the environment and reducing carbon emission, with an overall expectation to achieve the goal of 10% carbon reduction within the 5-year life span of sewage treatment.