| 摘要 |
#CMT# #/CMT# Preventing deposits in drainage systems of underground work, comprises intermittently adding a biodegradable conditioning agent to the water of the drainage system, which at least partially prevents and/or degrades precipitation-related organic and/or inorganic deposits, where the conditioning agent is added at intervals and in a subsequent second time interval no conditioning agent is added. #CMT#USE : #/CMT# The method is useful for preventing deposits in the drainage systems. #CMT#ADVANTAGE : #/CMT# The method is reliable, economical, safe and environmentally friendly, makes use of the biodegradable conditioning agents (lactic acid) to prevent the formation of biofilms, thus it avoids problems associated with the biofilms. #CMT#ENVIRONMENT : #/CMT# Preferred Method: The length of the second time interval is chosen such that existing biofilm layers are reduced, disappeared and/or no new biofilm layers are formed. Preferred Components: The first time interval is 1-100 days, preferably 5-15 days, and the second time interval is 3-100 days, preferably 5-15 days, or the first time interval and the second time interval is 5-10 days, respectively. The drainage system is located in a tunnel or is connected to a tunnel. #CMT#INSTRUMENTATION AND TESTING : #/CMT# Preferred Method: The intervals are controlled by a timer, which defines the switch-on and switch-off operating phases. #CMT#ORGANIC CHEMISTRY : #/CMT# Preferred Method: The method includes optionally adding a biocide to the water of the drainage system at least within the second time interval. The method includes adding the conditioning agent having a concentration of 0.5-50000 g/m 3>, preferably 1-10000 g/m 3> to the water to be treated. The method includes adding lactic acid (alone or in admixture with other fruit acids, polyaspartic acid, or polycarboxylic acid) as the conditioning agent, where only 80-95% aqueous solution of lactic acid is used. The conditioning agents in liquid, preferably aqueous solution form is added to the accessible portion of the drainage system using a dosing system for the controlled intervals, where optionally an active substance is introduced in to the inaccessible portion of the drainage system through recirculation system. Preferred Components: The conditioning agent prevents the formation of new organic and/or inorganic encrustations in the form of lime deposits, and/or induces or promotes the elimination of existing organic and/or inorganic encrustations in the form of lime deposits. The concentration of the conditioning agent at the feeding point is greater than 100 g/m 3>, and decreases to less than 20 g/m 3> at the end of the drainage system. #CMT#EXAMPLE : #/CMT# No suitable example given. |
