the description that follows includes exemplary apparatus , methods , techniques , or instruction sequences that embody techniques of the inventive subject matter . however , it is understood that the described embodiments may be practiced without these specific details . presently preferred hydrogen sulfide scavengers to act as both a hydrogen sulfide scavenger and as a long term biocide include , but are not limited to triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine . generally useful hydrogen sulfide scavengers to act as both a hydrogen sulfide scavenger and as a long term biocide include , but are not limited to , alkanolamines such as monoethanolamine , diethanolamine , n - methyldiethanolamine , and diglycolamine . other hydrogen sulfide scavengers include but are not limited to triethanolamine , diisopropanolamine , 2 - amino - 2 - methyl - 1 - propanol , polyethylene glycol , n - methyl pyrrolidone , propylene carbonate , methanol , potassium carbonate , sulfolane , triazine , triazinine , meric amidines , maleimides , azodicarbonamides ; dimethylsulfates , diethylsulfates , nitrites , bicarbonates , carbonates , hydroxides , alkoxides , or the like , or mixtures or combinations thereof , including but not limited to ethylenediaminetetraacetic acid and hydroxyethylethylenediaminetriacetic acid ; ferric chelates such as n -( 2 - hydroxyethyl ); zinc chelates such as zinc carboxylate ; piperazinone alkyl substituted derivatives such as 1 , 4 - dimethylpiperazinone ; benzoquinones such as para - benzoquinone ; and nitrate solutions . presently the preferred short term or quick kill biocide is 2 , 2 - dibromo - 3 - nitrilopropionamide . other useful biocides include , but are not limited to calcium hypochlorite , aldehydes , quaternary phosphonium compounds , quaternary ammonium compounds , cationic polymers , organic bromides , metronidazole , isothiazolones , isothiazolinones , thiones , organic thiocyanates , phenolics , alkylamines , diamines , triamines , dithiocarbamates , and 2 -( decylthio ) ethanamine and its hydrochloride , hypochlorite and hypobromite and their salts , stabilized bromine chloride , chlorine dioxide , chloroisocaynurates , halogen containing hydantoins , hydrogen peroxide , and peracetic acid . each of the tests depicted below are conducted in tubes of culture media that is specifically formulated to promote the growth of anaerobic sulfate reducing bacteria . the medium contains reducing agents that maintain a low oxidation reduction potential and thus allows for maximum growth . when the anaerobic sulfate reducing bacteria grow in this medium , sulfate is reduced to sulfide and a black precipitate of iron sulfide is formed . the degree of blackening through the medium is directly proportional to the amount of sulfate reducer growth . table 1 below gives the numbers of sulfate reducing bacteria by appearance based upon the number of days that the test sample has incubated . fig1 depicts several test vials each having a sample of water that generates & gt ; 200 ppm of hydrogen sulfide in the overhead space as well as being contaminated with sulfate reducing bacteria were treated with 0 . 1 gallons per thousand ( gpt ) of a of a hydrogen sulfide scavenger triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine . the mixture was then allowed to sit for 24 hours . the mixture was then placed in test vials before additional biocide was added . each test vial was then allowed to sit for six days during which the test vials were inspected to determine the amount of sulfate reducing bacteria present in each vial . test vial 10 was not treated with a short term biocide and is used as a baseline . test vial 10 turned black after 4 days indicating that there were between about 10 4 - 10 3 sulfate reducing bacteria per ml present in test vial 10 after incubating for 4 days . test vial 12 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide as a short term biocide . test vial 12 also turned black after 4 days indicating that there were between about 10 4 - 10 3 sulfate reducing bacteria per ml present in test vial 12 after 4 days . test vial 14 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 2 gpt of a 50 % solution of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 14 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 14 after 6 days . test vial 16 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of a 25 % solution of glutaraldehyde as short term biocides . test vial 16 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 16 after 6 days . test vial 18 was treated with 0 . 75 gpt of 50 % solution of didecyl - dimethyl ammonium chloride and 0 . 2 gpt of 50 % solution of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 18 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 18 after 6 days . test vial 20 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of a solution of 27 % solution glutaraldehyde and 5 % solution of benzyl quat as short term biocides . test vial 20 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 20 after 6 days . test vial 22 was treated with 0 . 4 gpt of a solution of 27 % glutaraldehyde and 5 % benzyl quat as a short term biocide . test vial 22 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 22 after 6 days . fig2 depicts several test vials each having a sample of water that generates & gt ; 30 ppm of hydrogen sulfide in the overhead space and is contaminated with a sulfate reducing bacteria after having been treated with 0 . 2 gallons per thousand ( gpt ) of a of a hydrogen sulfide scavenger triazine based mixture having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine . the mixture was then placed in test vials previous additional biocide was added . each test vial was then allowed to sit for six days during which the test vials were inspected to determine the amount of sulfate reducing bacteria present in each vial . test vial 30 was not treated with a short term biocide and is used as a baseline . test vial 30 turned half black after 4 days indicating that there were between about 10 3 - 10 2 sulfate reducing bacteria per ml present in test vial 30 after incubating for 4 days . test vial 32 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide as a short term biocide . test vial 32 did not change its color and remained clear indicating that there were less than 10 sulfate reducing bacteria per ml present in test vial 32 after 6 days . test vial 34 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 2 gpt of 50 % solution of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 34 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 34 after 6 days . test vial 36 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of 25 % solution of glutaraldehyde as short term biocides . test vial 36 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 36 after 6 days . test vial 38 was treated with 0 . 75 gpt of a 50 % solution of didecyl - dimethyl ammonium chloride and 0 . 2 gpt of a 50 % solution of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 38 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 38 after 6 days . test vial 40 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of a solution of 27 % glutaraldehyde and 5 % solution of benzyl quat as short term biocides . test vial 40 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 40 after 6 days . test vial 42 was treated with 0 . 4 gpt of a solution of 27 % glutaraldehyde and 5 % solution of benzyl quat as a short term biocide . test vial 42 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 42 after 6 days . fig3 depicts several test vials each having a sample of water where the accumulation of hydrogen sulfide in the overhead space is 0 . 0 ppm as well as being contaminated with a sulfate reducing bacteria after treated with 0 . 5 gallons per thousand ( gpt ) of a of a hydrogen sulfide scavenger triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine . the mixture was allowed to sit for 24 hours . the mixture was then placed in test vials and an additional biocide was added . each test vial was then allowed to sit for six days during which the test vials were inspected to determine the amount of sulfate reducing bacteria present in each vial . test vial 50 was not treated with a short term biocide and is used as a baseline . test vial 50 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 50 after 6 days . test vial 52 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide as a short term biocide . test vial 52 did not change its color and remained clear indicating that there were less than 10 sulfate reducing bacteria per ml present in test vial 52 after 6 days . test vial 54 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 2 gpt of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 54 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 54 after 6 days . test vial 56 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of 25 % solution glutaraldehyde as short term biocides . test vial 56 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 56 after 6 days . test vial 58 was treated with 0 . 75 gpt of 50 % solution of didecyl - dimethyl ammonium chloride and 0 . 2 gpt of 50 % solution of tetrakis - hydroxymethylphosphonium sulfate as short term biocides . test vial 58 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 58 after 6 days . test vial 60 was treated with 0 . 75 gpt of a 5 % solution of 2 , 2 - dibromo - 3 - nitrilopropionamide and 0 . 4 gpt of a solution of 27 % glutaraldehyde solution and 5 % benzyl quat solution as short term biocides . test vial 60 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 60 after 6 days . test vial 62 was treated with 0 . 4 gpt of a solution of 27 % glutaraldehyde and 5 % benzyl quat as a short term biocide . test vial 62 did not change its color and remained clear indicating that there were between about less than 10 sulfate reducing bacteria per ml present in test vial 62 after 6 days . fig4 depicts a several test vials with flowback water in each of the test vials . test vial 70 was not treated and is used as a baseline . test vial 70 turned black after 4 days indicating that there were between about 10 4 - 10 3 sulfate reducing bacteria per ml present in test vial 70 after 4 days . test vial 72 was treated with 0 . 2 gpt of a 25 % solution of hydrogen peroxide solution as a short term biocide and 0 . 2 gpt of hydrogen sulfide scavenger triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine and 0 . 2 gpt of 12 . 5 % sodium hypochlorite as short term biocide . test vial 72 did not change its color and remained clear indicating that there were less than 10 sulfate reducing bacteria per ml present in test vial 72 after 6 days . test vial 74 was treated with 0 . 2 gpt of 25 % solution of hydrogen peroxide as a short term biocide and 0 . 2 gpt of hydrogen sulfide scavenger triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine and 0 . 5 gpt of 12 .% solution of sodium hypochlorite as a short term biocide . test vial 74 did not change its color and remained clear indicating that there were less than 10 sulfate reducing bacteria per ml present in test vial 74 after 6 days . test vial 76 was treated with 0 . 2 gpt of 25 % solution of hydrogen peroxide as short term biocide and 0 . 2 gpt of hydrogen sulfide scavenger triazine based material having about 30 % to 60 % alkanolamine / aldehyde condensate , 5 % to 10 % methanol , and 1 % to 5 % of monoethanolamine and 1 . 0 gpt of 12 . 5 % solution of sodium hypochlorite as a long term biocide . test vial 76 did not change its color and remained clear indicating that there were less than 10 sulfate reducing bacteria per ml present in test vial 76 after 6 days . this list of additives is not exhaustive and additional additives known to those skilled in the art that are not specifically cited above fall within the scope of the invention while the embodiments are described with reference to various implementations and exploitations , it will be understood that these embodiments are illustrative and that the scope of the inventive subject matter is not limited to them . many variations , modifications , additions and improvements are possible . plural instances may be provided for components , operations or structures described herein as a single instance . in general , structures and functionality presented as separate components in the exemplary configurations may be implemented as a combined structure or component . similarly , structures and functionality presented as a single component may be implemented as separate components . these and other variations , modifications , additions , and improvements may fall within the scope of the inventive subject matter .