Wastewater Treatment
ระบบบำบัดน้ำเสีย ระบบกำจัดไขมัน และน้ำมัน ระบบบำบัดน้ำเสียด้วยวิธีทางเคมี (Chemical Treatment System) ระบบบำบัดน้ำเสียด้วยวิธีทางชีวภาพ (Biological Treatment System)
Trickling Filter
Trickling Filter is the most common choice of use in biological wastewater treatment plant. The filter system is consist of a media bed in which wastewater is continuously distributed. Trickling filters can be divided into different types mainly on the criteria based on the organic loading rates to the treatment plant system from low up to super-high rate trickling filters. Most of the time, two-stage filters are often designed and installed back to back in a series involving two sets of filters.
Low-rate trickling filter is a simple setup that will work in tandem with other device to produce effluent discharge with overall consistent quality. It can only take in wastewater influent with a certain degree of biological load and there is no recirculation of wastewater involved. Design of the filters can either be rectangular or circular in shape and hydraulic loading is controlled using pumps to a small sized dosing tank to achieve a consistent rate. In treatment plants with smaller capacity, extreme care must be applied to ensure that the efficiency of the whole process does not suffer due to long stagnant interval period of 1 to 2 hours. This is important in order to protect the biological slime that can degrade due to lack of moisture.
Low-rate trickling filters are also known to provide highly efficient BOD removal due to the design of the system. In the whole setup, only the top portion of the filter media are filled with biological slime while the lower part are usually populated by nitrifying bacteria. Presence of these bacteria is important in any wastewater system because it helps to oxidize ammonia to nitrite and then nitrate and thus an efficient treatment plant should have a well-established population. However, main disadvantage associated with low-rate trickling filters is the odor problem coming from stale wastewater because of its slower loading rate.
