This paper reported the pollutant removal performances of a hybrid wetland system for the treatment of aquaculture wastewater. The system consisted of two treatment stages: a subsurface vertical flow (VF) wetland, followed by a horizontal flow (HF). The aquaculture wastewater with the different concentrations such as eutrophy and mesotrophy was treated using hybrid constructed wetland. The expe...

We designed experiments to evaluate the fate of the addition of wastewater-borne nutrients injected into the shallow subsurface in the Florida Keys. During three different experiments, either bulk unlabeled phosphate, radio-labeled phosphate Ž 3y. Ž 1y. Ž PO , or bulk unlabeled nitrate NO was added simultaneously with conservative tracers sulfur hexafluoride and 4 3 . I-131 into a wastewater in...

Background: Investigating the performance of naturally operated treatment plants may be due to the fact that they cannot be operated as desired, or that they should be modified to achieve good performance e.g. for nutrients removal. The advantage of kinetic coefficient determination is that the model can be adjusted to fit data and then used for analyzing alternatives to improve the process. Th...

The enrichment of denitrifying phosphate accumulating organisms (DNPAOs) is the prerequisite for the denitrifying phosphate removal process. This study investigated the effect of nitrate concentration on the enrichment of DNPAOs was studied with batch experiments. The Sequencing Batch Reactor (SBR) was set-up with acetate as the sole carbon source. The addition of nitrate solution and the anoxi...

The radiolytic decomposition of oxytetracycline and effects of inorganic ions were studied. The removal efficiency of oxytetracycline , 30 mg/L, was 99% at the irradiation dose of 0.7 kGy. Chloride , sulfate , nitrite , nitrate and phosphate had effects on oxytetracycline degradation. Especially , nitrite and nitrate showed the significant inhibition effect on the radiolytic degradation of oxyt...

The use of algae to treat wastewater has been under investigation for decades. Laboratory experiments were performed to study the growth rate and nitrate and phosphate uptake of free and immobilized cells of saline tolerant, nitrogen fixing cyanobacterium Gloeocapsa gelatinosa. The immobilization was carried out in calcium alginate matrix. The immobilized cells were found to be highly effective...

Groundwater flow and nutrient transport were studied in a riparian meadow during a three-year period. The meadow is situated along a first order stream in the River Gjern catchment area, Jutland, Denmark. Field data included measurements of hydraulic head, hydraulic conductivity and soil characteristics. Groundwater sampled from piezometers was analysed for nitrate, ammonium and phosphate. Nitr...

Treated wastewater discharged from more than 400 onsite wastewater treatment systems (OWTS) near the Civic Center area of Malibu, California, 40 km west of downtown Los Angeles, composes 28% of the recharge to a 3.4 km(2) alluvial aquifer. On the basis of δ(18) O and δD data, the fraction of wastewater in some samples was >70%. Ammonium and nitrate concentrations in water from 15 water-table we...