fieldtrip report di an water treatment plant

This report cover also what we have seen at Di An Water Treatment Plant, it is from this plant where water used in Binh Duong province comes from, where we saw how water from Tan An stat

INTERNATIONAL UNIVERSITY DEPARTMENT OF ENVIRONMENTAL

ENGINEERING

FIELDTRIP REPORT

Instructor: Dr.Tran Tien Khoi

Class: Water Treatment

Student and ID name: Bui Thi Uyen Uyen (EVEVIU18060)

Date of field trip: 26/11/2020

Grade:

Comment:

Table of Contents

I.INTRODUCTION 3

II DI AN WATER TREATMENT PLANT 4

2.1 INTRODUCTION 4

2.2 INTAKE 4

2.3 COURSE SCREEN 5

2.4 RAW WATER PUMPS 5

2.5 COAGULATION AND FLOCCULATION 5

CHEMICAL MIXING TANK 5

CHEMICAL REACTION TANK 6

2.6 SEDIMENTATION TANK 8

2.7 FILTRATION AND DISINFECTION 9

FILTRATION PROCESS (SAND FILTER) 9

DISINFECTION 10

BACKWASHING 10

2.8 PUMPING SYSTEM 10

2.9 CONCLUSION AND RECOMMENDATION FOR DI AN WATER TREATMENT TRIP 11

I.INTRODUCTION

Di An Water Treatment Plant (DAWTP) is making steady progress in improving access to safe water We conduct a field trip and we make its report

This document concern a report of our field trip done on 11 December 2020 at th

DAWTP where we saw the water treatment system This report cover also what we have seen at Di An Water Treatment Plant, it is from this plant where water used in Binh Duong province comes from, where we saw how water from Tan An station- Dong Nai river is treated by following steps: cascade aeration, coagulation addition, flocculation, sedimentation, filtration, storage and pumping systems DAWTP is located at Thu Dau Mot town in Binh Duong province The company was established in April 1997, as a governmental company

Di A Water Treatment Plant (DAWTP) is one of seven WTP plants being claimed

by BIWASE The plant was built in 2000 and its activity started in 2004 DAWTP

is situated at A Phu ward, Thuan A locale, which imparts the outskirt to Ho Chi Minh City DAWTP has a limit of 30,000 m3/day and the crude water wellspring

of this treatment plant is Dong Nai River which is the longest stream in Vietnam Dong Nai River is the hotspot for Tri A lake from where the crude water is siphoned for DAWTP This lake capacities to balance out the progression of Dong Nai River in both dry and rainy seasons

Table: Overrall information of Di An Water Treatment Plant

Design capacity (m3/d) 30,000

Treated water standard ACVN 01:2009/BTNMT

Date of access of the source

information

22 August 2015

Primary pumping station is located at Tan Uyen district and it pumps raw water from Dong Nai River The raw water is pumped to the secondary pumping station located in the main treatment plant Treatment facilities lies at higher elevation to avoid the surface flow entering the WTP The clean water is supplied to the residents of Di An ward and the industrial park located near the WTP

II DI AN WATER TREATMENT PLANT

2.1 INTRODUCTION

Di An water treatment plant started working in 2004 Now it has capacity to treat 30,000 m per day.Its intake is near water treatment plant from Dong 3

Nai River Di An treatment plant as other water treatment plant treat water

by the following steps:

1 Intake

2 Course Screen

3 Raw Water Pumps

4 Coagulation (Mixing chamber)

5 Flocculation

6 Sedimentation

7 Filtration

8 Disinfection

9 Pumping system

This process of water treatment plant:

Raw water extraction (Dong Nai River) →Bar screen → Primary raw water pumping station→ Chemical mixing tank → Reaction tank → Horizontal sedimentation → Rapid filtration tank → Clean water tank->Secondary pumping station->Distribution network

2.2 INTAKE

Di An water treatment plant takes water from Dong Nai river, specially Tan

An commune, Thai Hoa ward, Tan Uyen district, Binh Duong province Dong Nai river intake is located at 5km of water treatment

2.3 COURSE SCREEN

The raw river water passes through a bar screen system (which is installed higher than the surface water level by 0.5 m) to remove the coarse size suspended solid (mainly plastic bags)

2.4 RAW WATER PUMPS

There are 5 submerged pumps with following specification: motor power=

155 kW, capacity= 700 m /h and total head = 70 m 3

The raw river water passes through a bar screen system (which is installed higher than the surface water level by 0.5 m) to remove the coarse size suspended solid (mainly plastic bags) Then two pipes, each with the diameter of 500 mm and length of 45m, transfers water into the vertical sand sedimentation well (L = 2.5 m, W = 1,6 m, H = 10 m) The pumping station

is automatic and keeps running all the time The flow and pumping pressure depends on the demand of the main treatment site The chlorine is injected at this primary station at the dosage of 1 g/m3, to prevent the algae and microorganisms growth

2.5 COAGULATION AND FLOCCULATION

CHEMICAL MIXING TANK

Poly-aluminium chloride (PAC) is added in the water pump from the primary pumping station in this tank The SCADA (Supervisory Control and Data Acquisition) system receives the signal from pH and Turbidity meter (installed directly in this tank) and then automatically calculates and apply the chemical dose The water is then transferred to the coagulation and flocculation unit through the distribution tank

The PAC mixing tank

CHEMICAL REACTION TANK

This process is called flocculation and Coagulation to support settling of the particles Flocculation is way water passed form shican mixed with coagulant and lime goes in order to mixed in order to favorite the formation

of flocs The mixing is done by electrical mechanical mixer At the inlet of flocculation tank they are small flocculation tank equipped with pipe There are two reaction tanks, each with the dimensions of 9mx13mx5.5m (WxLxH) The hydraulic retention time is 1 hour The effluent of this tank is then transferred to the horizontal sedimentation tank with the velocity (theory required)

The chemical mixing tank

Distribution tank

Chemical reaction tank

Chemical reaction tank

2.6 SEDIMENTATION TANK

The sludge generated from sedimentation tank is collected and treated by sludge drying beds They have large amounts of suspended particles, those particles after flocculation in flocculation tank water is conveyed to sedimentation tank where small flocs become bigger and as its density are greater than the density of water settle at the bottom of sedimentation tank and flocs of less density float

The horizontal sedimentation tank is divided into three working states: State 1: Receiving the water from the chemical reaction tank (after coagulation-flocculation process)

State 2: Settling zone The length of the tank is occupied by this zone Hence, normally particles settle in the first half of the tank The sludge will

be removed in the bottom of tank

State 3: Settled water The clean water is collected by a weir system This equipment is installed from the middle of the horizontal tank, below the surface level of water

There are 2 sedimentation tanks, each with the dimension of: L x W x H= 39

x 6 x 3.5 (m)

Tricking filter

2.7 FILTRATION AND DISINFECTION

FILTRATION PROCESS (SAND FILTER)

There are 5 rapid sand filters The filter media contains: 0.3 m of course stone layer at the bottom and 1.2 m of fine sand (effective diameter of 0.8-1.2 mm) The filtration rate is in the range from 5 – 15 m/h There are two basic types of filter backwashing system: fluidized-bed backwash with surface wash and air scour and water backwash Adopted backwash method is water backwash with air scour, using backwashing pump The average filter run time is around 2 days

The weir that collected clean water after sedimentation process

After sedimentation process at it outlet they are a small chamber with a small pipe in order to conduct a solution of chlorine to water come from sedimentation tank This chlorine is used to disinfect water

BACKWASHING

The backwash water from both filters (each with the capacity of 15000 m3/d) is sent back to the chemical mixing tank

2.8 PUMPING SYSTEM

The SCADA system ensure this pumping station is operated 24/24 h.This is

a secondary pumping process that included distribution pump and backwash pump There are 5 pumps (3 operating, 2 standby) with the technical

information as follows:

- Motor: Capacity= 160 kW, Q= 700 m /h 3

The rapid filtration tank The filtration tank with water spray to clean the wall

2.9 CONCLUSION AND RECOMMENDATION FOR DI AN WATER TREATMENT TRIP

As your knowledge, water is second requirement for human life so the water need be treated and to be honest untreated water is the most source of communicable diseases All the water quality parameters must be under the national standard for drinking water (QCVN 01:2009/ BTNMT)

III.REFERENCES

Binh Duong Water Supply Sewerage Environment Limited Company (BIWASE) Retrieved on 6 December, 2015, from

http://biwase.com.vn/english/XNCN-DA.aspx

Di An Water Treatment Plant (2014) Annual Report in 2014 Binh Duong Vietnam Nhung, H.T.H (2015) Internship Report of Di An Water Treatment Plant Thu Dau Mot University, Vietnam