Biochemical oxygen demand BOD The BOD test gives
Biochemical oxygen demand (BOD) The BOD test gives an indication of the oxygen required to degrade biochemically any organic matter present in a water, as well as the oxygen needed to oxidize inorganic materials such(1. 1) as sulphides. Table shows the standards for the water quality parameters interested in drinking water. Parameter Aldicarb Aldrin + dieldrin Aluminuma *Antimonyb Arsenic *Atrazine + metabolites Azinphos-methyl Barium Bendiocarb Benzene Benzo[a]pyrene MAC (mg/L) 0. 009 0. 0007 0. 006 0. 010 0. 005 0. 02 1 0. 04 0. 005 0. 00001
*Boron 5 *Bromate 0. 01 Bromodichloromethane (BDCM) 0. 016 *Bromoxynil 0. 005 Cadmium 0. 005 Carbaryl 0. 09 Carbofuran 0. 09 Carbon tetrachloride 0. 005 Chloramines--total 3 Chlorate 1. 0 Chloride Chlorite 1. 0 Chlorpyrifos 0. 09 Chromium 0. 05 Colourd Copperb *Cyanazine 0. 01
Cyanide Cyanobacterial toxins. Microcystin-LRc Diazinon Dicamba 1, 2 -Dichlorobenzenee 1, 4 -Dichlorobenzenee *1, 2 -Dichloroethane 1, 1 -Dichloroethylene Dichloromethane 2, 4 -Dichlorophenol, *2, 4 Dichlorophenoxyaceti c acid (2, 4 -D) Diclofop-methyl *Dimethoate Dinoseb Diquat 0. 2 0. 0015 0. 02 0. 12 0. 005 0. 014 0. 05 0. 9 0. 1 0. 009 0. 02 0. 01 0. 07
Diuron 0. 15 Ethylbenzene Fluoride 1. 5 *Glyphosate 0. 28 Haloacetic Acids-Total (HAAs) 0. 080 Iron Leadb 0. 01 Malathion 0. 19 Manganese Mercury 0. 001 Methoxychlor 0. 9 Methyl tertiary-butyl ether (MTBE) *Metolachlor 0. 05 Metribuzin 0. 08 Monochlorobenzene 0. 08 Nitratef 45 Nitrilotriacetic acid (NTA) 0. 4 Odour No
*Paraquat (as dichloride)g 0. 01 Parathion 0. 05 Pentachlorophenol 0. 06 p. Hh 6. 2 -8 Phorate 0. 002 *Picloram 0. 19 Selenium 0. 01 *Simazine 0. 01 Sodiumi Sulphatej Sulphide (as H 2 S)
Taste No Temperature *Terbufos 0. 001 Tetrachloroethylene 0. 03 2, 3, 4, 6 -Tetrachlorophenol 0. 1 Toluene Total dissolved solids (TDS) Trichloroethylene 0. 005 2, 4, 6 -Trichlorophenol 0. 005 *Trifluralin 0. 045 Trihalomethanes-total (THMs)k 0. 100 Turbidityl <1 NTU *Uranium 0. 02 Vinyl chloride 0. 002 Xylenes—total Zincb
a. This is an operational guidance value, designed to apply only to drinking water treatment plants using aluminum-based coagulants. The operational guidance values of 0. 1 mg/L applies to conventional treatment plants, and 0. 2 mg/L applies to other types of treatment systems. b. Faucets should be thoroughly flushed before water is taken for consumption or analysis. c. The guideline is considered protective of human health against exposure to all microcystins that may be present. d. TCU = true colour unit. e. In cases where total dichlorobenzenes are measured and concentrations exceed the most stringent value (0. 005 mg/L), the concentrations of the individual isomers should be established. f. Equivalent to 10 mg/L as nitrate-nitrogen. Where nitrate and nitrite are determined separately, levels of nitrite should not exceed 3. 2 mg/L.
g. Equivalent to 0. 007 mg/L for paraquat ion. h. No units. i. It is recommended that sodium be included in routine monitoring programmes, as levels may be of interest to authorities who wish to prescribe sodium-restricted diets for their patients. j. There may be a laxative effect in some individuals when sulphate levels exceed 500 mg/L. k. Expressed as a running annual average. The guideline is based on the risk associated with chloroform, the ltrihalomethane most often present parameters and in forgreatest Refer to section on Guidelines for microbiological information related various treatment concentration in todrinking water. processes. Public acceptance of hardness varies considerably. Generally, hardness levels between 80 and 100 mg/L (as Ca. CO 3) are considered acceptable; levels greater than 200 mg/L are considered poor but can be tolerated; those in excess of 500 mg/L are normally considered unacceptable. Where water is softened by sodium ion exchange, it is recommended that a separate, unsoftened supply be retained for culinary and drinking purposes.
- Slides: 8