||Wastewater has been a big issue for the environment. Carbohydrates, nitrogen, phosphorus, and other nutrients, when in the water, will cause algae to multiply, lead to low dissolved oxygen to produce an anaerobic environment. Under the action of anaerobic bacteria it will produce pollutants and odor substances. Then it will affect the quality of water and air. So this is an important issue of environment. |
The study notes constructed wetlands that can effectively reduce nutrient concentrations in domestic wastewater. Dapeng Bay National Scenic Area has many salt constructed wetlands to treat the domestic and aquaculture wastewater from surrounding communities, with a variety of wetland plants, animals and microorganisms in the different function of water treatment unit.
We selected a wetland in Dapeng Bay as study sites: Datam constructed wetland, with an inlet that is domestic wastewater. It also has shallow pond, swamp, sedimentation pond, deep pond and other areas. Sampling aspect is continuous sampling that takes a season for four days, and every six hours take a water sample for analysis. Through the experimental analysis of Suspended Solids, ammonia nitrogen, total Kjeldahl nitrogen, nitrite, nitrate, orthophosphate, total phosphorus, Biochemical oxygen demand, and total carbon water quality index. The aim is to investigate the concentration of pollutant-change and observe the different seasons of the contaminant reduction condition. This is so as to find out the environment and climate which can effectively reduce the concentration of pollutants in wastewater.
Spring has a better removal efficiency. Suspended solids removal efficiency of 43.3%, total phosphorus of 41.2%, total nitrogen of 35.6%, biochemical oxygen demand of 34%. Due to summer's high temperature accelerated microbial growth in the deep pool, resulting in wetland pollutant concentration increased. The results showed that the water quality of wetland and the total organic carbon and total nitrogen in soil were positively correlated with methane (CH4) and nitrous oxide (N2O) released from greenhouse gases, especially in summer.