Research on landfill leachate treatment by ozonation method - 2

with the influence of reaction time 86

Table 3.14. Treatment efficiency of organic substances in leachate by single ozone and Perozo

..........................................................................................................................................87

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Table 3.17. O 3 consumption in the Ozone/ceramic pad experiment with a specific surface of 728 m 2 /m 392

Perozon/ceramic cushion 94

Table 3.20. O 3 and H 2 O 2 consumed in the Perozon/ceramic pad experiment with a specific surface of 728 m 2 /m 396

Table 3.23. O 3 consumption in the Ozone/manganese ore experiment 500 mg/l 104

Table 3.26. Average consumption of O 3 and H 2 O 2 after experiment with Perozon system/manganese ore 500 mg/l 109

Table 3.28. Experimental conditions for studying the kinetics of COD treatment of leachate 111

Table 3.29. Summary of leachate treatment results 112

Table 3.30. Summary of results of calculating pseudo-first order reaction rate constant k* of COD treatment process in leachate by Ozone systems 114

Table 3.31. Pseudo-first-order reaction rate equation for COD treatment of leachate using ozone process 115

Table 3.32. Summary of results of calculating pseudo-first order reaction rate constant k* of COD treatment process of leachate of Perozon 116 systems

Table 3.33. Pseudo-first order reaction rate equation for COD treatment of leachate using Perozon 116 process

LIST OF IMAGES

Figure 1.1. Water balance components in landfill cell 6

Figure 1.2. Indirect and direct ozonation models 18

Figure 2.1. Experimental diagram of leachate coagulation 45

Figure 2.2. Lin 4.10L 46 ozone generator

Figure 2.3. Experimental diagram of leachate treatment using single Ozone or Perozone 47

Figure 2.4. Experimental diagram of leachate treatment using Ozone, Perozone, Ozone/ceramic pad, Perozone/ceramic pad, Ozone/manganese ore 48

Figure 2.5. Experimental pilot treatment of leachate using single Ozone and Perozone 49

Figure 2.6. Experimental diagram of leachate treatment using Ozone combined with ceramic pad 54

Figure 2.7. SEM image of manganese ore sample used in study 56

Figure 2.8. Experimental diagram of leachate treatment using catalytic ozone 57

Figure 3.1. Effect of PAC on COD of leachate after treatment 64

Figure 3.2. Effect of PAC on the color of leachate after treatment 65

Figure 3.3. Effect of PAC on suspended solids in leachate after treatment 65

Figure 3.4. Effect of pH on color after treatment with single ozone 67

Figure 3.5. Effect of pH on COD after treatment with single ozone 67

Figure 3.6. Effect of pH on TOC after treatment with single ozone 67

Figure 3.8. Effect of reaction time on color after single Ozone treatment 73

Figure 3.9. Effect of reaction time on COD after single ozone treatment 73

Figure 3.10. Effect of reaction time on TOC after single ozone treatment 73

Figure 3.11. Effect of reaction time on BOD5 / COD after treatment with single Ozone 75

Figure 3.12. Effect of pH on color after treatment with Perozon 76

Figure 3.13. Effect of pH on COD after treatment with Perozon 76

Figure 3.14. Effect of pH on TOC after treatment with Perozon 77

Figure 3.16. Effect of H 2 O 2 on color after treatment with Perozon 81

Figure 3.17. Effect of H 2 O 2 on COD after treatment with Perozon 81

Figure 3.18. Effect of H 2 O 2 on TOC after treatment with Perozon 82

Figure 3.20. Effect of reaction time on color after treatment with Perozon 84

Figure 3.21. Effect of reaction time on COD after treatment with Perozon 85

Figure 3.22. Effect of reaction time on TOC after treatment with Perozon 85

Figure 3.36. Oxidation pathway of organic substances when O 3 combines with catalyst 102

Figure 3.37. Mechanism of adsorption on catalyst and oxidation of organic substances adsorbed by O 3 and OH •102

Figure 3.38. Reaction mechanism for generating hydroxyl radicals (OH • ) or other radicals by the reaction

Reaction of O 3 with reduced metals of catalyst 103

Figure 3.39. Effect of manganese ore on color after treatment with Perozon/manganese ore 105

Figure 3.40. Effect of manganese ore on COD after treatment with Perozon/manganese ore 105

Figure 3.41. Effect of manganese ore on TOC after treatment with Perozon/manganese ore 106

Figure 3.43. Decomposition of H 2 O 2 on the surface of catalyst 108

Figure 3.44. Kinetic graph of COD treatment of leachate by Ozone systems 112

Figure 3.45. Kinetic graph of COD treatment of leachate of Perozon 113 systems

Figure 3.46. Graph for determining the pseudo-first-order reaction rate constant k* of the COD treatment process of leachate using Ozone 114

Figure 3.47. Graph for determining the pseudo-first-order reaction rate constant k* of the COD treatment process of leachate using Perozon 115 systems

Figure 3.48. Proposed technological flow chart for leachate treatment 124

Urgency of the topic:

INTRODUCTION​​

Leachate generated from solid waste landfills is one of the causes of serious environmental pollution around landfill areas.

leachate properties vary not only with the type of solid waste but also with the age of the landfill and with the season of the year .

at the age of the song

classify water into : water​​​​​​​​

In Vietnam, most provinces and cities collect and bury domestic solid waste. However, solid waste in many areas has not been classified, and landfilling has not really followed sanitary landfill techniques. The composition of buried solid waste is very diverse, containing both organic substances that are difficult to biodegrade and toxic. Therefore, the problem of leachate treatment is still a difficult problem to solve in many areas. The leachate treatment system in many landfills, although in operation, has not really brought about the desired results. Many systems have had to be renovated many times after a period of operation [5]. Therefore, finding new and effective treatment methods needs to be studied to overcome the disadvantages of old technologies.

and humic acid . 2) Inorganic pollutants in leachate, mainly ammonia (NH 3 )

in the form of ammonium ions (NH 4 + ) in leachate has a very high content. This is the "key" to determining the efficiency of leachate treatment.

In recent years, to treat difficult organic pollutants, people have

Advanced oxidation processes have been applied, in which ozone is one of the oxidants .

(major oxidant) is widely used. This method is considered a new scientific achievement in the field of water and wastewater treatment in the last two decades.

in the world [12]. Ozone agent is

used to oxidize organic compounds in

oxidizing agents

Other advanced chemistry studies have demonstrated effective COD or TOC removal in leachate [27,

61, 77, 78, 82, 92, 100, 103]. Ozone oxidation processes of organic substances have great prospects in water and wastewater treatment technology in the 21st century [12, 70, 94].

In our country, initial research on the application of Ozone or Perozone has been carried out.

Research and application of leachate treatment. The efficiency of leachate treatment by Ozone and Perozone can be improved if combined with catalysts or treated in a reactor containing buffer materials. In particular, materials of natural origin containing many metal oxide radicals are quite common in Vietnam and act as catalysts for the ozone reaction. These materials promise to significantly improve the efficiency of treating organic substances in leachate by the catalytic ozonation process. However, studies on its application as a catalyst for the ozone process in leachate treatment are still very limited. Therefore, in

In this thesis , catalytic ozone processes are applied to improve the efficiency of treating difficult - to - decompose organic substances in wastewater treatment .

optimized for the treatment of organic matter in wastewater​​​​​​

Single ozone (O 3 ) and Perozone (O 3 /H 2 O 2 ).

2. Improve the efficiency of treating organic substances in discharged water with Ozone and Perozone combined with ceramic pads .