TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The sulfide-consuming chemical is a chlorite salt and the nitrate compound is a nitrate salt and with the amount of nitrate compound being in excess of the sulfide-consuming chemical. The chlorite salt is sodium chlorite present in about 0.01-0.39 % and the nitrate compound is sodium nitrate and is present in about 40-80 %. The metal or alkali metal salts comprises magnesium hydroxide, calcium hydroxide, magnesium oxide and/or calcium oxide. The enzyme blend is comprised of those enzymes produced by nitrate reducing, sulfide-oxidizing bacteria and the enzyme blend is comprised of sulfide dehydrogenase.Preferred Process: The sulfide consuming chemical is alkali metal salts of hypochlorite, chlorite, nitrite, peroxide, percarbonate, perborate, or ferrous or ferric iron salts, peroxy monosulfuric acid, chlorine, hydrogen peroxide or chlorine dioxide and their mixtures (preferably an alkali metal chlorite). The alkali metal chlorite is sodium chlorite, calcium chlorite and/or potassium chlorite. The nitrate salt is sodium nitrate, calcium nitrate, potassium nitrate, ammonium nitrate and/or aluminum nitrate.In the process, a mixture of ammonium nitrate and other nitrate salts is selected to achieve a desired crystallization temperature. The aluminum nitrate is one of the nitrate salts in the blend and is fed so that the aluminum has the benefit of reducing phosphate in the downstream wastewater plant. The bacterial consortia are comprised of a mixture of nitrate reducing and sulfide-oxidizing bacteria. The enzymes are those enzymes produced by nitrate-reducing, sulfide-oxidizing bacteria. The bacterial consortia consists mainly of sulfide oxidizing nitrate reducing bacteria such as Thiobacillus denitrificans. The bacterial enzyme is sulfide dehydrogenase. The composition is in the form of an aqueous solution or a dry solid.The composition is added to provide sulfide consuming chemical in the ratio of 2-10 parts sulfide-consuming chemical per part sulfide to accomplish removal of sulfide and to provide nitrate ion in the ratio of 10-30 parts nitrate ion per one part sulfide ion by weight. The aluminum nitrate is one of the nitrates in the blend and is fed so that the aluminum has the benefits of both consuming sulfide and reducing phosphate in the downstream wastewater plant.The pH elevating salt comprises metal or alkali metal salts of carbonate ion or hydroxide ion or of metal or alkali metal oxides, which react with water to form hydroxide ion. The composition is added to provide sulfide consuming chemical in the weight ratio of 1-10 parts by weight of sulfide consuming chemical per part by weight of sulfide to accomplish removal of sulfide or to provide nitrate ion in the weight ratio of 10-30 parts nitrate ion per million parts by weight of water to prevent biogenic generation of sulfide or to provide pH-elevating salt in the weight ratio of 10-100 parts pH-elevating salt by weight per million parts by weight of waste. (I) is added to provide nitrate ion in the weight ratio of 10-30 parts nitrate ion per million parts by weight of water to prevent biogenic generation of sulfide.