A kind of starch and polylactic acid blend and its preparation method and application
A polylactic acid and blend technology, which is applied in the field of starch and polylactic acid blends and their preparation, can solve the problems of low denitrification rate and high cost, and achieve reduced denitrification cost, strong adaptability, and denitrification rate. accelerated effect
Inactive Publication Date: 2016-04-06
TSINGHUA UNIV
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Problems solved by technology
These carbon sources have certain defects, such as low denitrification rate, high DOC, chroma, and total number of bacteria in the effluent water at the initial stage of operation, or high cost, etc.
Method used
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Embodiment 1
[0020] 44g of cornstarch, 45g of polylactic acid (molecular weight: 40,000), 10g of water and 1g of KH-550 silane coupling agent were stirred evenly, and extruded and granulated in a twin-screw extruder at 150°C.
Embodiment 2
[0022] 50g of tapioca starch, 33g of polylactic acid (molecular weight: 80000), 15g of water and 2g of KH-560 silane coupling agent were stirred evenly, and extruded and granulated in a twin-screw extruder at 165°C.
Embodiment 3
[0024] After stirring 30 g of cornstarch, 55 g of polylactic acid (molecular weight: 40,000) and 15 g of water evenly, extrude and granulate in a twin-screw extruder at 175° C.
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The invention discloses a starch-polylactic acid blend and a preparation method and application thereof, and belongs to the technical field of environmental protection. The blend is prepared by uniformly stirring starch, polylactic acid, water and a silane coupling agent, and extruding and granulating in a double-screw extruder at the temperature of between 150 and 175 DEG C. The starch-polylactic acid blend is used as a denitrifying microbial carbon source in water treatment and a biofilm carrier simultaneously, so that the defect that the addition amount of a liquid carbon source adopted in the conventional denitrifying process is difficult to control is overcome, and the blend has high adaptability to the dissolved oxygen (DO) and pH of inlet water.
Description
technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a blend of starch and polylactic acid, a preparation method and application thereof. Background technique [0002] The main pollution indicators of the seven major river systems in my country including the Yangtze River, Yellow River, Pearl River, Songhua River, Huaihe River, Haihe River and Liaohe River include ammonia nitrogen, and the main pollution indicators of national key lakes also include total nitrogen. In groundwater, nitrate, as a major pollution indicator, has a prominent content in groundwater in all regions of the country, and it has been a pollution indicator whose content has generally increased year after year. However, the low organic pollution in surface water or groundwater cannot meet the carbon source demand of biological denitrification and denitrification, so an additional carbon source must be added. The conventional biologi...
Claims
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IPC IPC(8): C08B31/00C02F3/28
Inventor 王建龙沈志强
Owner TSINGHUA UNIV
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