NOVELTY - Preparing water lettuce deodorant, by inoculating microbial mixture comprising lactic acid bacteria, nitrifying bacteria and Bacillus on to cell culture medium, performing culturing process, performing static culturing process, measuring total viable count of microorganism, obtaining five different types of deodorizing liquid by processing digested sewage, adding lettuce crushed product and solid medium, adding deodorant liquids, stirring mixture evenly and performing fermentaiton to obtain lettuce deodorant.    USE - The method is useful for preparing water lettuce deodorant used for reducing ammonia content and hydrogen sulfide content of air and eliminating odor of farm.    ADVANTAGE - The water lettuce deodorant effectively reduces ammonia content and hydrogen sulfide content of air to eliminate odor of farm. The preparation method is simple and cost-effective.    DETAILED DESCRIPTION - Method for preparing water lettuce deodorant, involves (a) inoculating microbial mixture comprising lactic acid bacteria, nitrifying bacteria and Bacillus in a ratio of 2:1:1 on to cell culture medium, performing culturing process under shaking condition at 180 revolutions per minute (rpm) and 28 degrees C for 8 hours, further performing static culturing process at room temperature for 48 hours, and taking predetermined amount of each culture solution periodically for measuring total viable count of the microorganism, where when number of viable cells reaches 100000000 cells/ml after stationary phase, desired culture liquid is obtained, (b) diluting digested farm sewage by adding water in an amount 25 times that total volume of sewage, further adding culture liquid obtained in the step (a) in an amount 10 times the total volume of obtained mixture, sufficiently shaking the mixture, adding 10 ml mixture to clean test tube, adding 1 ml culture liquid to the mixture in test tube, shaking the test tube for 3 minutes, incubating otbained solution at 28 degrees C for 48 hours, observing the solution every 24 hours after the incubation process, measuring number of microbial cells in the culture liquid, where when number of cells reaches 100 million bacteria/ml, liquid without any odor is obtained, the pH of the liquid is 4-5 and primary culture liquid is incubated at room temperature for 72 hours, (c) mixing digested farm sewage and culture liquid in a weight ratio of 1:99 to obtain mixed medium, adding culture medium to the primary culture liquid in a weight ratio of 5:95, stirring solution for 5 minutes, incubating solution at 28 degrees C for 48 hours, observing the culture solution every 24 hours, determining number of cells in the liquid, where when measured number of cells reaches 100 million cells/ml, an odorless liquid is obtained, adding and mixing obtained cell culture medium and effluent in a weight ratio of 2:98 to obtain two mixed media, adding deodorant liquid to obtained solution, adding and mixing both deodorizing liquids in a ratio of 5:95, stirring culture liquid for 5 minutes, incubating the culture liquid at 28 degrees C for 48 hours, observing liquid every 24 hours, where when measured number of cells reaches 100 million cells/ml two deodorant liquids are obtained, adding and mixing culture media and effluent in a weight ratio of 4:96 to obtain culture medium mixture, adding culture medium mixture to resulting two liquid deodorants, adding and mixing liquid deodorants in a weight ratio of 5:95, stirring solution for 5 minutes, incubating the solution at 28 degrees C, observing the solution after every 48 hours, measuring number of cells, where when measured number of cells reaches 100 million cells/ml odorless liquid is obtained, adding sewage and cell culture medium in a weight ratio of 6:94 to obtain deodorant liquids, adding deodorant liquids in weight ratio of 5:95, stirring solution for 5 minutes, incubating liquid at 28 degrees C for 48 hours, obsercing the liquid every 24 hours, measuring number of cells, when number of cells reaches 100 million cells/ml 4 deodorant liquids are obtained, taking the sewage and cell culture medium mixed in a weight ratio of 10:90 to form 5 mixed media, addign liquid to the 4 deodorization media mixed in a weight ratio of 5:95, stirred solution for 5 minutes, incubating solution at 28 degrees C for 48 hours, observing the solution every 24 hour, calulating number of cells, when measured number of cells reaches 100 million cells/ml, 5 deodorant liquids are obtained, finally taking all the 5 strains mixed with 5 deodorant liquid mixed in a weight ratio of 95:5, incubating the mixture at 28 degrees C under sealed conditions, observing number of cells, where when number of cells reaches 100 million cells/ml, yellow colored and sour liquid alcohols are obtained, (d) picking and cleaning fresh lettuce, performing rotational drying process at 240 rpm until no natural surface water on the lettuce is present, crushing dried lettuce into coarse product of 1.5 plus minus 1.5 cm, and (e) adding crushed product and solid medium obtained in the step (d) in a weight ratio of 1:3, placing the lettuce plants in wet mixer, adding obtained mixture to deodorized liquid, adding strains of ultimate deodorant liquid mixer for total weight of 5% with respect to the liquid, stirring mixture evenly, sealing tank and performing fermentaiton at 28 degrees C for 48 hours, observing fermentation process, where when fermentated product turns brownish in color, sour in taste, and has moisture content of 35%, and number of colonies being 100 million colony forming units (CFU) or more to obtain the lettuce deodorant.