Mercury

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Degradation of PCBs • Substrate sludge contains more PCBs with less Cl content while upper sludge contains more PCBs with more Cl content, because in the upper strata active soft soil, PCBs with less Cl content are easily degraded by microorganizm while PCBs with more Cl content are relatively stable. • Water solubility is also a factor. PCBs with higher solubility are easily biodegraded. • There is a marked concentration of PCBs when it comes to biodegradation, which is the lowest required concentration of PCBs for them to be biodegraded.
Treatment of PCBs • Mainly include sealing and storage, hightemperature treatment, chemical treament and biodegradation, etc. • Combustion at high temperature is a developed treatment way for PCBs which will be degraded completely in 2 seconds at 1200 o C but needs to prevent the production of dioxins, a significant canceroge. • Sealing and storage is a temporary way of treatment and can’t solve the problem of PCBs pollution fundamentally.
Page 1 and 2: Environmental Chemistry Part 5 Typi
Page 3 and 4: • Typical organic pollutants PAHs
Page 5 and 6: Mercury (Hg) 1. Source and Distribu
Page 7 and 8: 2. Transport and Transformation of
Page 9 and 10: Mercury in the air • come from vo
Page 11 and 12: 4) Hg 2+ can easily form complex co
Page 13 and 14: Mercury in the soil • Over 95% of
Page 15 and 16: The methylation process of mercury
Page 17 and 18: Dimethyl mercury Under anaerobic co
Page 19 and 20: Transport and Transformation of Mer
Page 22 and 23: . Hazards of Mercury Pollution •
Page 24 and 25: . Prevention of Mercury pollution
Page 26 and 27: Environmental Chemistry Part 5 Typi
Page 28 and 29: asic characteristics of PCBs 1) Hig
Page 30 and 31: Transport and transfomation of PCBs
Page 32 and 33: The atmosphere is purified of PCBs
Page 34 and 35: The transport of PCBs in water •
Page 36 and 37: The transformation ways of PCBs in
Page 40 and 41: 1) Sealing and storage • To seal
Page 42 and 43: Fusion medium method( 熔融介
Page 44 and 45: 4) Biodegradation • A potential m
Page 46 and 47: surface active agent • Definition
Page 48 and 49: Classification and properties of su
Page 50 and 51: 2. Cationic surfactant • The hydr
Page 52 and 53: 4. Nonionic surfactant • Nonionic
Page 54 and 55: 2) the relative position of hydroph
Page 56 and 57: 4) hydrophobic groups • The order
Page 58 and 59: 2. hazards 1) Surface active agent
Page 60 and 61: 4) The sterilization of high-concen
Page 62 and 63: 1. Bio-degradation of surface activ
Page 64 and 65: 4) Oxidation of aromatic compounds
Page 66 and 67: 2) Anionic surfactant • Anionic s
Page 68 and 69: The relationship between molecular
Page 70 and 71: 3 steps for the photocatalysic degr
Page 72: One of the key points in the resear

Mercury

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