Assessment report



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7.5. Quality of Service

7.5.1. Quality of influent at WWTPs


The quality of influent is presented in Table 7.6. Quality of Influent. As results, there are some comments as below:

  • In general, concentrations of the contaminants in the influent are relatively low.

  • The influent in the combined and partially separated sewers: some criteria in the many stations did not pass Column B of Standards (QC 14 and QCVN 40) as: COD in Bac Ninh. Da Nang and Soc Trang WWTPs; TSS - Phu My Hung

The main reason for this is that the domestic wastewater is preliminary treated in septic tanks and then collected into sewer system together with storm water.

7.5.2. Quality of effluent (after treatment):


The quality of effluent is presented in Table 7.7. Quality of effluent

As results, it presents some comments as below:



  • In general, the quality of effluent met requirements. even where the requirements specified in column A (Binh Duong);

  • The percentage of tested samples that passed the relevant standard are shown in Table 7.8 and found that almost of utilities as of 100% excluding Quang Binh (96%). HCMC (83%).

Figure 7.4: Percentage of tested samples that passed the relevant standard by DoNRE



Figure 7.5: Percentage of tested samples that passed the relevant standard by Utility


7.5.3. Quality control


Table 7.8 summaries the quality control of the Utilities. As results, it presents some comments as below:

  • Quality management system according to ISO 9001: Only 4/13 complied with as including Hanoi. Dak Lak. HCM City and Binh Duong. The remaining utilities (9/13) should consider to develop a quality management system.

  • The number of complaints about wastewater treatment that received in the year: all utilities excluding Soc Trang reported that they did not receive any complaints. However, the data seem to be considered as reference as the people did not send written complaints as practices. In fact, the media has reflected people's reactions relating to the odors generated from wastewater treatment stations using covered anaerobic lagoon in Da Nang and the remedial measures has been taken.

  • Staff training: Only 2/13 utilities including Da Nang and Soc Trang with training costs for staff. The utilities needs to pay much attention to the staff training on regular basis as in fact the staffs in WWTPs always changed by leaving of the skilled staffs.

Table 7.6 - Quality of influent water conveyed into the WWTPs

Utility

(WWTP)

Total of influent

Outside sludge

pH

BOD5

COD

TSS

N-NH4

T-N

T-P

Coliform

m3/year

m3/year




mg/l

mg/l

mg/l

mg/l

mg/l

mg/l

MPN/ 100ml

Combined sewers system/Partially separated sewers, rivers, lakes

Ha Long URENCO JSC (Ha Khanh)

3,221,232

940

5-9

60-200

200-600

120-200

4-6

15-20

4-8

3,000-4,800

Bac Giang UDPC

3,300,000




6.5 - 8

150-320







0.14- 0.52

0.3-3.5

0.66-9




Ha Noi HSDC

4,280,095




7.2-7.3

65-165

118-190

55-108




32-45

4.5-6.8




Bac Ninh DWT Co. Ltd (Bac Ninh City)

1,963,941




7-7.35

26-66.7

44-99.7

13.5-26.2




16.6-41

1.03-3.1




Hai Duong UWM JSC

1,800,000




7.20

96.00

182.00

113.00













Quang Binh EUD Co. Ltd

1,366,543




7.13-8.05

184-193

243-388

200-420

9.5-34.6

11.3-36.3

0.54-3.39




 Da Nang SDC (Hoa Cuong)

42,648,745




7.1-7.7

54-164

25-143

46-202




4.5-55.8

0.6-5

75,103-15,106

HCMC UDC (Binh Hung)

56,510,410







23-156

41-173

20-440




8.1-29.9

0.7-4.5




Phu My Hung Corp

1,984,438




6.5-6.96

100-145

220-250

36-75

12-15

24-33

2.8-3.15




Soc Trang UWC

2,310,508




6.86-7.02

99.8-129.5

138.5-164.3
















Separated sewers system































Dak Lak UMENCO

1,861,500

4,953

6.3 - 7.1

197 -718

312 - 1362

215 - 428

14.7 - 32.5

54.2 - 124.2

15.7 - 53.8




LAWACO

2,900,603

734




124.57-431.88

176.92-861.54

105-913

13.84-99.17










Phu My Hung Corp

1,984,438




6.5-6.96

100-145

220-250

36-75

12-15

24-33

2.8-3.15




BIWASE

1,944,820

6.311

6.7-7.3

60-150

140-350

100-200

20-40

25-55

42,125



Table 7.7 - Quality of effluent at WWTP



Indicator’s Utility

(WWTP)

pH

BOD5

COD

TSS

N-NH4

T-N

T-P

Coliform




mg/l

mg/l

mg/l

mg/l

mg/l

mg/l

MPN/ 100ml

Effluent quality passed QCVN - Column B

Ha Long URENCO JSC (Ha Khanh)

7-8

20-50

20-50

40-100

1.5-3

4-8

1-3

1,000-1,500

Bac Giang UDPC




42,193

10.6- 50




0.12-0.31

1.01 -14.2

0.4-5.3




Ha Noi HSDC

7.2-7.3-7.5

6.6-9.6-13

13-16.3-19.3

3-5-8




8.3-12.3-15.6

0-0.4-0.9

0-5-40

Bac Ninh DWT Co. Ltd (Bac Ninh city)

6.4-6.7-7

3.4-6.1-9.4

13-15.6-21.7

0.5-2.1-3.4

NI

11.3-20.3-36

0.58-1.4-2.8

NI

Hai Duong UWM JSC

7.30

59

107

45













Quang Binh EUD Co. Ltd

7.58-8.23-9.0

9.5-26-32.4

22.4-40.2-58

1.58-9.63-12

0.65-5.63-10.2

1.58-9.63-12

0.11-2.66-5.2

1,013-1,957-2,900

 Da Nang SDC (Hoa Cuong)

6.5-8.5

47

77

62

NI

17

1.9

162.000

Đak Lak UMENCO

7.2 - 7.3 - 7.4

25.6 - 42 -62.8

25.3-56.0-73.6

23.1-32.6 -43.2




11.4-14.0 -16.5

4.3 - 6.2 - 7.5

4,200-4,600-5,000

LAWACO




1.72-14.31

3.85-90

22-187

4.34-28.42







2,300-2,400

HCMC UDC (Binh Hung)

6.17-7.1

3-9-21

10-22-31

2-8-64

NI

5.3-13.5-28.8

0.2-0.58-2.3

0-200

Phu My Hung Corp

5.8-6.7

4-9




6-21

0.1-6.57

2.63-18.3

0.48-2.45

0-46

Soc Trang UMC

7.07-7.09

103.7-126.3

151.4-170.7

23.4-40













Effluent quality passed QCVN - Column A

BIWASE

6.3-6.5-6.8

3-8-10

8-15-20

5-10-15

0.1-0.5-1.5

3-5-9

0.5-1.5-2.5

100-300-1,000

Table 7.8 - Quality Control

Name of Utility

Number of WWTPs with “Management and operation Contract”

Ratio of tested samples that passed the relevant standard

Complaints/ 1.000 people


ISO 9001

Audit energy

Customer survey

by DoNRE (%)

by Utility (%)

Code

C39

C3.4

C3.5

C3.6

A14

A15

A16

Ha Long URENCO JSC

4

100.0

100.0

0










Bac Giang UDPC




N/I

N/I

0










Ha Noi HSDC

3

100.0

100.0

0

Yes

No

No

Bac Ninh DWT Co. Ltd

1

100.0

100.0

0

No

Yes

Yes

Hai Duong UWM JSC

1

100.0

100.0

0

No

No

Yes

Quang Binh EUD Co. Ltd

1

66.7

95.9

0

No

No

No

 Da Nang SDC




100.0

100.0

0

No

No

No

DakLak UMENCO

1

N/I

100.0

0

Yes

No

Yes

LAWACO

1

100.00

0

0

No

No

No

HCMC UDC




N/I

83.33

0

Yes

No

Yes

Phu My Hung Corp




N/I

100.00

0

Yes

No

No

BIWASE

1

100.00

100.00

0

Yes

Yes

Yes

Soc Trang UWC

1




100.00

35.95

No

No

No





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