[SCIE web news, March 20th, 2017] Everyone knows that we should save water and treat wastewater carefully, but how many of us actually know how wasted water is treated? On 14th and 15th of March 2017, almost all of the G2 students in SCIE went to the chemistry filed trip to SZWG Yantian Waste Water Treatment Plant. As the treatment plant isn’t large enough, the students were divided into two groups; one group went to the filed trip on 14th march and the other group went to the filed trip on 15th march.
The bus carrying the students left SCIE at one o’clock in the afternoon sharp. After 50 minutes of travelling on the bus, the students reached the plant. The water treatment plant locates close to the sea. Despite it was already March, the sea fetch was still cold. After arriving the plant, students are divided into two groups according to their classes. The first group visited the gallery first, and after this they went to the treating section. The second group was the opposite. The workers in the water treatment plant explained the history and water treating method clearly to the students. They said that instead of using the traditional chemical-based water treating method, SZWG used microbe Modified Sequencing Batch Reactor (MSBR) water treating method, which is more substantial and environmentally friendly water treating method. After the briefing, workers in the plant took us to the filed where wasted water is treaded in practice.
In Shenzhen, domestic sewage (such as bath water and kitchen water) will pass through special sewage pipe and pump before reaching wastewater treatment plant. In order to prevent large particles’ blocking the system within the treatment plant, the sewage will pass through a filter before entering the plant.
Then, sedimentation is conducted to separate the precipitate such as sand. Then the sewage comes to the core procedure. Sewage will pass through oxygen enrichment and hypoxia conditions in order to kill aerobic bacteria and anaerobic bacteria. After this, specially cultivated flora will cling organic compounds together and then it will precipitates to the bottom of the tank.
At the end of the treatment sequence, the treated water will pass through a sequence of UV light emitter to sterilize the rest harmful bacteria.
Although some part of the treatment plant was filled with unpleasant smell, students are still fascinated by the wastewater treatment procedures. At half past three, students went back to SCIE, and this brings the interesting and educational chemistry filed trip to an end.
Thanks for the careful preparation done by chemistry office and let us express our acknowledgment to Shenzhen Water (Group) Co., LTD. Yantian Wastewater Treatment Plant.
By Grace and Tony