Mercury

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. Prevention of <strong>Mercury</strong> pollution • Improve traditional techniques, adopt substitute materials and reduce the use of mercury. • Sealed storage; prevent leaking when using; in case of dropping, cover with sulfur powder. • Treatment of waste water containing mercury Settling method :add sulfide to form HgS, through settlement and centrifugation. Ion-exchange method:pump in chlorine gas to transform elementary mercury into ionic mercury, then add chloride to change it into anionic complex compounds, and then remove it using anion exchange resin. Sometimes using cation exchange resin to treat waste water with a low concentration of Cl-.
Coagulation method:using alum, iron salts and limes, etc. as the coagulant Absorption method:Using active carbon or other natural macromolecular compounds with strong chelating power. Reduction method:ionic mercury is reduced to elemetary mercury and then filter the waste water. reducing agent: Al, Zn, SnCl2 etc. Ion-exchange method/ Coagulation method using iron salts or aluminum salts/ Absorption method using active carbon can reduced the concentration of dissolved mercury in the water to lower than 0.01 mg/L; The combination of Settling method using sulfide and Coagulation method can reduce the concentration of dissolved mercury to 0.02 mg/L;Reduction method is used when the concentration of mercury in the waste water is very low.
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 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 38 and 39: Degradation of PCBs • Substrate s
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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