Some Pictures During The Project Implementation Process

Figure 4.24. Total P removal results in aquaculture wastewater from electrocoagulation tank

corresponding to U&I values ​​or current density 77

Figure 4.25. Inlet and outlet wastewater of electrochemical coagulation tank

and two USBF tanks (total retention time 10h) 80

Figure 4.26. SS removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 10h 81

Figure 4.27. COD removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 10h 82

Figure 4.28. BOD 5 removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 10h 82

Figure 4.29. TKN removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 10h 83

Figure 4.30. Total P removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 10h 83

Figure 4.31. Inlet and outlet wastewater of electrochemical coagulation tank

and two USBF tanks (total retention time 8h) 86

Figure 4.32. SS removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 8h 87

Figure 4.33. COD removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 8h 88

Figure 4.34. BOD 5 removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 8h 88

Figure 4.35. TKN removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 8h 89

Figure 4.36 Total P removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 8h 89

Figure 4.37. Inlet and outlet wastewater of electrocoagulation tank

chemical and two USBF tanks (total retention time 7h) 92

Figure 4.38. SS removal results in aquaculture wastewater of USBF tank

USBF tank without rack & rack with total retention time 7h 93

Figure 4.39. COD removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 7h 94

Figure 4.40. BOD 5 removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 7h 94

Figure 4.41 TKN removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 7h 95

Figure 4.42. Total P removal results in aquaculture wastewater of USBF tank with value

cling & USBF tank without cling with total retention time 7h 95

LIST OF TABLES

Page

Table 2.1. Suitable conditions for nitrification process 19

Table 2.2. Advantages and disadvantages of some types of 24-pin price

Table 3.1. Indicators to be monitored and how to analyze them 49

Table 4.1. Experimental results to determine the type of metal used for electrodes 52

Table 4.2. Experimental results to determine water retention time for electrochemical coagulation tank 55

Table 4.3. Results of experiments to determine the distance between two electrodes

for electrochemical flocculation tank 62

Table 4.4. Results of experiments to determine the area of ​​electrode 68

Table 4.5. Results of experiments to determine current values ​​(U and I) 75

Table 4.6 Concentrations of pollutants in input and output wastewater

KTĐH tank - 2 USBF tanks with retention time of 10h 81

Table 4.7. Concentrations of pollutants in input and output wastewater

KTĐH tank - 2 USBF tanks with total retention time of 8h 87

Table 4.8. Concentrations of pollutants in input and output wastewater

KTĐH tank – 2 USBF tanks with total retention time 7h 93


LIST OF APPENDIXES


APPENDIX 1: SAMPLE ANALYSIS RESULTS TABLE

Table 1. Input and output physical and chemical parameters, treatment efficiency, standard deviation


Page

of replicate experiments on retention time 15 min 104

Table 2. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on 30 min retention time 104

Table 3. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on retention time 45 min 104

Table 4. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on retention time 60 min 105

Table 5. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on retention time 75 min 105

Table 6. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on retention time 90 min 105

Table 7. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on retention time 105 min 106

Table 8. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments on retention time 120 min 106

Table 9. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the distance between the two electrodes is 1cm 106

Table 10. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the distance between the two electrodes is 2cm 107

Table 11. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the distance between the two electrodes is 3cm 107

Table 12. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of the repeated experiments on the electrode plate area is 100 cm 2107

Table 13. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of the repeated experiments on the electrode plate area is 200 cm 2108

Table 14. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of the repeated experiments on the electrode plate area is 300 cm 2108

Table 15. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the value of U and I of the current is 15V – 1.1A 108

Table 16. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the value of U and I of the current is 18V – 1.4A 109

Table 17. Input and output physical and chemical indicators, treatment efficiency, standard deviation

of repeated experiments on the value of U and I of the current is 24V – 1.6A 109

Table 18. Values ​​of physical and chemical indicators of input, output, treatment efficiency, standard deviation

of repeated experiments of USBF tank without cling film with retention time of 10h...109 Table 19. Values ​​of physical and chemical indicators of input, output, treatment efficiency, standard deviation

of replicate experiments of USBF tank with retention time of 10h 110

Table 20. Values ​​of physical and chemical indicators of input, output, treatment efficiency, standard deviation

of replicate experiments of the USBF tank without cling with 8h retention time 110

Table 21. Values ​​of physical and chemical indicators of input, output, treatment efficiency, standard deviation

of repeated experiments of USBF tank with clinging price with total retention time of 8h ...110 Table 22. Values ​​of physical and chemical indicators of input, output, treatment efficiency, standard deviation

of replicate experiments of the USBF tank without cling with 7h retention time 111

Table 23. Values ​​of input and output physical and chemical indicators, treatment efficiency, standard deviation

of replicate experiments of USBF tank with cling plate with total retention time of 7h ...111

APPENDIX 2: DATA RUNNING RESULTS

Table 1. Duncan analysis results of the retention times of the electrochemical flocculation tank 112

Table 2. Duncan analysis results for the distances between the two electrodes 112

Table 3. Duncan analysis results for electrode plate areas 113

Table 4. Duncan analysis results for U and I values ​​of current 113

Table 5. Duncan analysis results for USBF tanks with and without support

adhesion price with total retention time of 10h 113

Table 6. Duncan analysis results for USBF tanks with and without support

adhesion price with total retention time of 8h 114

Table 7. Duncan analysis results for USBF tanks with and without support

adhesion with retention time of 7h 114

APPENDIX 3: SOME PICTURES DURING THE PROJECT IMPLEMENTATION

Figure 1. Transformer used to convert alternating current into direct current 115

Figure 2. Electric meter used to measure electricity consumption 115

Figure 3. Electrodes (white electrode is Al, black electrode is Fe) 116

Figure 4. Model of electrochemical flocculation tank operating in batches 116

Figure 5. Sludge culture tank 117

Figure 6. 117 clinging rearing tank

Figure 7. Gas distribution unit 118

Figure 8. Aerator 118

Figure 9. Sludge recirculation machine 119

Figure 10. Mario jar 119

Figure 11. USBF tank without 120 support

Figure 12. USBF tank with 120 mount

LIST OF ABBREVIATIONS


EC

Electrocoagulation

Electrochemical capacitor

USBF

Upflow Sludge Blanket Filtration

Filter through suspended sludge layer

BOD

Biochemical Oxygen Demand

Biochemical oxygen demand

COD

Chemical Oxygen Demand

Chemical oxygen demand

DO

Dissolved Oxygen

Dissolved oxygen

F/M

Food/Microorganism

Food to bacteria ratio

MLSS

Mixed Liquor Suspended Solid

Suspended solids in

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Some Pictures During The Project Implementation Process

activated sludge

SS Suspended Solid

Environmental Engineering and Natural Resources

TKN Total Kjeldahl Nitrogen Total Kjeldahl Nitrogen

QCVN Vietnam Standards

Ministry of Natural Resources and Environment

Electrochemical Coagulation

Electricity consumption


CHAPTER I INTRODUCTION

Our country is on the path of integration and development, joining the World Trade Organization (WTO) is both an opportunity and a challenge for the country's economy. Since September 2008, the world economy has been in crisis and this has greatly affected our country's economy [1]. The economic growth rate decreased significantly in 2008. Specifically, GDP in 2008 increased by 5.5%, much lower than GDP in 2007 which increased by 8.44% [2; 3; 4]. Faced with this situation, our government has had a policy to revive the economy with economic stimulus packages worth a total of about 8.0 billion USD [5]. This support from the government along with the efforts of businesses has led to very positive signs of recovery in our country's economy in 2009 and 2010. All sectors achieved higher growth rates than the same period last year. In particular, GDP in the first 6 months of 2010 increased by about 6 - 6.1% [6].

Industries such as oil and gas exploitation, coal exploitation, textiles, rice export, seafood export, etc. are the industries that earn the most foreign currency for our country in the first 6 months of 2010. Specifically: oil and gas export reached 79.9 million USD, coal export reached 1.8 billion USD (first 4 months of 2010), textile export reached 4.65 billion USD, rice export reached 1.396 billion USD, seafood export reached 1.8 billion USD. Besides, industries, small-scale industry, trade - service also contribute significantly to the recovery of the economy [7; 8; 9; 10; 11].

Along with the economic recovery, factories and enterprises everywhere have resumed normal operations after a period of limited operation during the crisis and are increasingly expanding in scale. This is a good sign for the economy, but in return, our environment will be at risk of increasingly serious pollution. In particular, surface water is very susceptible to pollution due to untreated wastewater from industries or wastewater that is treated but does not meet the regulations in the QCVN system (specifically QCVN 24: 2009/BTNMT).

Among the types of wastewater, wastewater from seafood processing factories is one of the types with the highest potential to pollute surface water sources. Because this type of wastewater contains high levels of organic matter ( Lam Minh Triet - Nguyen Thanh Hung - Nguyen Phuoc Dan, 2006) . Besides, in all economic sectors of the country,

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