CONTENT Situation of industrial wastewater management Treatment Technological Needs 2

Transcription

1 WASTEWATER MANAGEMENT AND TECHNOLOGY NEEDS IN VIETNAM MR. NGUYEN MINH CUONG, DEPUTY DIRECTOR, DEPARTMENT OF INTERNATIONAL COOPERATION AND SCIENCE, TECHNOLOGY (ISD) VIETNAM ENVIRONMENT ADMINISTRATION (VEA) 1

2 CONTENT Situation of industrial wastewater management Treatment Technological Needs 2

3 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT Status of discharging Industrial zones: Total wastewater is m3/day/night, projected m3. Treatment capacity: m3 Industrial complexes: 610/660 operating complexes. Craft Environmental villages: Science Institute - ESI ~ 500 villages, no data of wastewater 3 discharging 3

4 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT Status of treatment Industrial zones: 75% of operating industrial zones (212/283) completed centralised wastewater treatment system (treated 60% of total wastewater discharged by 212 industrial zones) Industrial complexes: 5% of operating industrial complexes have centralised wastewater treatment system Craft villages: few have wastewater treatment system installed Environmental Science Institute - ESI 4 4

5 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT Automatic monitoring system Industrial zones: 38,6% of industrial zones have automatic monitoring system Industrial complexes: No automatic monitoring system installed Craft villages: No automatic monitoring system installed Environmental Science Institute - ESI 5 5

6 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT 6 6

7 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT 7 7

8 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT INDUSTRIAL WASTEWATER STANDARDS This Regulation QCVN 40:2011/BTNMT provides for the maximum values of pollution parameters of industrial wastewater being discharged into receiving waters. Consists of 2 columns of limit values and 33 parameters. 8 8

9 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT INDUSTRIAL WASTEWATER STANDARDS 9 9

10 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT INDUSTRIAL WASTEWATER STANDARDS 10 10

11 SITUATION OF INDUSTRIAL WASTEWATER MANAGEMENT 2) INDUSTRIAL WASTEWATER STANDARDS: OTHER QCVN ON WW No Waste water quality standards No of standards 1 QCVN 60- National Technical Regulation on waste water of ethanol fuel MT:2015/BTNMT production 2 National Technical Regulation on Textile dyeing industrial QCVN 13- wastewater MT:2015/BTNMT 3 National Technical Regulation on Paper and pulp industrial QCVN 12- wastewater MT:2015/BTNMT 4 National Technical Regulation on seafood processing industrial wastewater QCVN 11- MT:2015/BTNMT 5 National Technical Regulation on natural rubber processing QCVN 01- industrial wastewater MT:2015/BTNMT 6 National Technical Regulation on Steel processing industrial QCVN wastewater 52:2013/BTNMT 7 National Technical Regulation on medical wastewater QCVN 28:2010/BTNMT 8 National Technical Regulation on petrol warehouse and stores wastewater QCVN 29:2010/BTNMT 9 Environmental National Science Technical Institute - ESI Regulation on offshore oil and gas works QCVN 11 35:2010/BTNMT 10 National Technical Regulation on the effluent from livestock QCVN MT:2016/BTNMT

12 TREATMENT TECHNOLOGICAL NEEDS 1. Wastewater treatment technology dealing with low C/N ratio in the incoming wastewater flow 92% OF WW CONVEYED BY USE OF COMBINED SEWERAGE SYSTEMS (CSS) CHALLENGES: LOW INFLUENT BOD ( mg/l: Range of annual average flows, vs. 50 mg/l NATIONAL CLASS B STANDARD FOR EFFLUENT BOD) 6 12

13 TREATMENT TECHNOLOGICAL NEEDS 2. Removal of organic matters from surface water - Coagulation Flocculation Sedimentation Rapid sand filtration is a conventional water treatment technology. - Conventional treatment process can remove 30-50% of organics. Powered activated carbon, Granular activated carbon seem not suitable in terms of cost. Biological carbon filtration (BCF) pretreatment does not give good results. - Inexpensive technology for retrofitting/ upgrading existing treatment plant is needed

14 TREATMENT TECHNOLOGICAL NEEDS 3. Equipment to control incoming wastewater low features for CETPs - Operator of CETP required factories to treat their own wastewater to avoid overloading of CETP treatment processes. - Number of CETPs is facing problem of shock loading of hazards. Failure of CETP operation leads to damage of system, exceeding effluent standard limit, and possible fines. - On-line monitoring of wastewater flows discharged from factories seems expensive. - Adequate control measures are needed

15 TREATMENT TECHNOLOGICAL NEEDS 4. Technology for decentralized wastewater treatment with small foot-print reactor and shallow reaction zone Decentralized wastewater treatment stations built for hospitals, hotels, apartments, commercial points in urban areas andresorts Installed in the basement or ground floor of the building. Limited foot print, and limited height of floor (around m)

16 TREATMENT TECHNOLOGICAL NEEDS 6. Technology to improve treatment performance of existing biological CETPs receiving non-degradable substances in incoming flows Non-degradable or slowly degradable substances appearing in incoming wastewater flows from such industries as printing ink, traditional medicine materials, cosmetics, paper and pulp, textile, etc. Chemically enhanced clarification - Biological treatmentprocesses? Measures to remove those substances before, during or after biological treatment steps are needed 15 16

17 TREATMENT TECHNOLOGICAL NEEDS 7. Pre-treatment of organic fractions of municipal waste, industrial waste and agro-waste before anaerobic digester for biogas recovery Pre-treat of waste fractions to convert them into easily degradable substrates before anaerobic digestion. Various materials, forms, sizes, shapes, and characteristics of different wastes make their pretreatment processes like separation, sorting, chopping, maceration, etc. difficult 17 17

18 TREATMENT TECHNOLOGICAL NEEDS 8. Energy efficient technology for sludge dewatering from water treatment plants - Conventional methods for sludge treatment are sludge thickening in a gravity thickener, followed by dewatering in sludge drying beds, or mechanical dewatering in machines such as centrifuge, filter press, belt press, etc. - Energy efficient sludge dewatering technology is needed in most of water treatment plants in Vietnam treating both ground and surface waters 18 18

19 TREATMENT TECHNOLOGICAL NEEDS 9. TREATMENT OF SLUDGE GENERATED FROM COMBINED SEWERAGE AND DRAINAGE SYSTEM DREGDED SLUDGE FROM SEWERAGE AND DRAINAGE NETWORK SEWAGE SLUDGE FROM WWTP Dumping is a most common method. Composting Anaerobic Digestion

20

21

22

23

24