Study on purification effects of nitrogen and phosphorus by constructed wetlands system in Xi’an

2015 ◽  
pp. 49-54
Keyword(s):  
Constructed Wetlands ◽  
Nitrogen And Phosphorus

scholarly journals Effectiveness of wastewater treatment from the fruit and vegetable industry in the vertical flow-type constructed wetlands

2018 ◽  
Vol 44 ◽  
pp. 00149 ◽  
Author(s):  
Monika Puchlik
Keyword(s):  
Wastewater Treatment ◽  
Organic Compounds ◽  
Constructed Wetlands ◽  
Total Nitrogen ◽  
Organic Substance ◽  
Treatment Plant ◽  
Phosphorus Compounds ◽  
Vertical Flow ◽  
Fruit And Vegetable ◽  
Nitrogen And Phosphorus

The purpose of the work was to determine the effectiveness of wastewater treatment from the fruit and vegetable industry in constructed wetlands supported by a bio-preparation. An increase in the efficiency of organic substance purification expressed as BOD5 and COD by 8% in deposit with the addition of bio-preparation in relation to the control bed (without the addition of bio-preparation), was found. The efficiency of the total suspension, total nitrogen and total phosphorus increased respectively by 19.5%, 10%, and 27% in relation to the bed without addition of bio-preparation. Constructed wetlands treatment plant ensures high removal of organic compounds expressed as BOD5 and COD, as well as guarantees reduction in the concentration of nitrogen and phosphorus compounds.

scholarly journals A Study on the Improvement of Treatment Efficiency for Nitrogen and Phosphorus in Livestock Treatment System Using Constructed Wetlands

2011 ◽  
Vol 44 (3) ◽  
pp. 434-441 ◽  
Author(s):  
Dong-Cheol Seo ◽  
Jong-Hwan Park ◽  
Ah-Reum Kim ◽  
Sung-Hun Kim ◽  
Seong-Tea Lee ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Treatment System ◽  
Treatment Efficiency ◽  
Nitrogen And Phosphorus

scholarly journals Nitrogen and Phosphorus Discharge during Spring Regeneration of Constructed Wetlands at a Commercial Nursery

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 764A-764
Author(s):  
Milton D. Taylor* ◽  
Stephen J. Klaine ◽  
Ted Whitwell
Keyword(s):  
Constructed Wetlands ◽  
Nitrate Removal ◽  
Nitrogen And Phosphorus ◽  
Nursery Production ◽  
Production Area ◽  
Nursery Runoff ◽  
Nitrite Nitrate ◽  
Area Monitoring ◽  
Net Export ◽  
Stage Efficiency

Mitigation of offsite movement of nutrients in nursery runoff is a serious concern for commercial nurseries with container-grown plants. Wight Nurseries, Cairo, Ga. has operated 3.77 ha of planted constructed wetlands since 1996 to remediate nutrients from runoff. The wetlands receive drainage from a 48.6 ha nursery production area. Monitoring by nursery staff had suggested net export of nitrogen and phosphorus may occur during spring regeneration. Intensive monitoring was conducted between early March and mid-May 2003. There was no net export of nitrogen during the study. Nitrite nitrogen removal remained at 100% in the 1st stage wetland throughout March but declined in April to 89.6% as loading increased 5-fold. However, the 2nd stage wetland removed 100% of the remaining nitrite. Nitrate removal in the 1st stage wetland was high through early April (97.6%) but low in 2nd stage wetlands (16%) until loading increased 10-fold when efficiency rose to 94.9%. Nitrate removal by the 1st stage declined during mid-April but 2nd stage efficiency remained above 95%. For phosphorus, there was net export during March from both stages. However, during April, the wetlands removed phosphorus although loading tripled during the month. In May, net export of phosphorus from the wetlands recommenced with peak 1st stage export of 130% and 2nd stage uptake declining until mid-May when export began again. Neither water temperature nor rainfall appeared correlated with wetland efficiency. While phosphorus was exported by the wetlands during parts of the study, neither nitrate nor nitrite was exported as spring progressed and decomposition of last year's growth accelerated.

scholarly journals Bacterial community shift and effects of the inclusion of a mixed psychrotrophic bacteria strain for sewage treatment in constructed wetland in winter seasons

2021 ◽  
Author(s):  
xiaoyan xu ◽  
Jie Jiang ◽  
Zhinan Guo ◽  
Lianglun Sun ◽  
Meizhen Tang
Keyword(s):  
Low Temperature ◽  
Constructed Wetlands ◽  
High Throughput Sequencing ◽  
Sewage Treatment ◽  
High Capacity ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Nitrogen And Phosphorus ◽  
Degradation Kinetic ◽  
Psychrotrophic Bacteria

Abstract The mechanism of wastewater treatment based on psychrophilic strains to improve the denitrification efficiency of constructed wetlands at low temperatures has already become a new hotspot. In this study, three mixed psychrophilic strains (Psychrobacter TM-1, Sphingobacterium TM-2 and Pseudomonas TM-3) with high capacity of denitrification were added into a vertical-flow constructed wetlands (CWs), and the effect of the mixed strains on CWs sewage treatment was evaluated. The removal efficiency of chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), total nitrogen (TN) and total phosphorus (TP) was quantified to establish the degradation kinetic model and determine the best dosage of the mixed strains. The effect mechanism of the mixed strains on indigenous microbial community and the change of sewage treatment performance in low temperature constructed wetlands was clarified by high-throughput sequencing technology. The results showed that the mixed strains can effectively remove the organic pollutants (nitrogen and phosphorus) and the optimum dosage of the mixed strain was 2.5%,with average removal rates of 1.52, 2.12, 2.07 and 1.29 times than those of the control. Meanwhile, the dominant strains in the CWs were Proteobacteria (31.23–44.34%), Chloroflexi (12.04–19.05%), Actinobacteria (10.6-20.62%), Acidobacteria (8.23–11.65%), Firmicutes (2.23–15.95%) and Bacteroidetes (4.01–18.9%). These findings provide a basis for the removal of pollutants in constructed wetlands at low temperature.

scholarly journals Role of different plants on nitrogen and phosphorus removal at low temperature in lab-scale constructed wetlands

2019 ◽  
Vol 118 ◽  
pp. 01023 ◽  
Author(s):  
Liwei Xiao ◽  
Hong Jiang ◽  
Chao Shen ◽  
Ke Li ◽  
Lei Hu
Keyword(s):  
Constructed Wetlands ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Sichuan Basin ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Relative Growth ◽  
Stems And Leaves ◽  
Removal Efficiencies

In this study, plant growth and nitrogen and phosphorus removal efficiency in lab-scale CWs by five plants (H. vulgaris, N. peltatum, N. tetragona, N. pumilum, S. trifolia) in winter in Sichuan basin was evaluated. H. vulgaris and N. tetragona would well adapt to the winter wetland environment, and the relative growth at the end of the experiment was 89.83% and 66.85%, respectively. In winter, H. vulgaris kept growing with accumulated stems and leaves, while growth of N. tetragona was mainly caused by the growth of roots and stems underwater. In addition, during the winter, removal efficiencies were 66.29%, 57.47%, 54.78%, 55.47%, 41.66% of TN and 62.40%, 69.75%, 69.97%, 65.65%, 76.55% of TP for each planted CWs respectively. The results indicated that the removal of nitrogen and phosphorus from CWs was mainly achieved by substrate, while a small portion was attributed by plant. However, plants like H. vulgaris and N. tetragona, in the CWs in winter can play the role of landscaping. Thus, H. vulgaris could be considered as a suitable and effective nutrient removal plant for treatment of nitrogen and phosphorus water in winter wetlands in Sichuan basin.

Nutrient removal from piggery effluent using vertical flow constructed wetlands in southern Brazil

2003 ◽  
Vol 48 (2) ◽  
pp. 129-135 ◽  
Author(s):  
P.H. Sezerino ◽  
V. Reginatto ◽  
M.A. Santos ◽  
K. Kayser ◽  
S. Kunst ◽  
...  
Keyword(s):  
Constructed Wetlands ◽  
Pilot Plant ◽  
Vertical Flow ◽  
Southern Brazil ◽  
Environmental Legislation ◽  
Swine Production ◽  
Nitrogen And Phosphorus ◽  
Piggery Wastewater ◽  
Vertical Flow Constructed Wetlands ◽  
P Removal

Santa Catarina State, southern Brazil, has the greatest swine breeding activities of Latin America. Generally, the piggery wastewater is treated in pond systems that are able to remove organic material according to local environmental legislation. However, these systems do not remove nitrogen and phosphorus efficiently. This work deals with a post-treatment system, using vertical flow constructed wetlands. The experiment was conducted in a swine production farm which has 45,000 animals. Although the pond system was able to partially remove the content of nutrients, their concentration in the effluent was high for environmental disposal. A four-bed vertical flow constructed wetland pilot plant, using Typha spp., was built. The pilot plant operated for 280 days for beds 2-4 (sand 2). However, the experiments with beds 1-3 (sand 1) were stopped after 111 days of operation, when a reduction in the wastewater drainage was observed. The beds with sand 2 showed a 33% COD removal, and about 49% of nitrification was observed from 111 days until the end of the operation. PO4-P removal was 45% with a loading rate of around 1.36 g m-2 d-1.

Subsurface-flow constructed wetlands treatment in the plains: five years of experience

2001 ◽  
Vol 44 (11-12) ◽  
pp. 375-380 ◽  
Author(s):  
M.F. Dahab ◽  
R.Y. Surampalli
Keyword(s):  
Constructed Wetlands ◽  
Fecal Coliform ◽  
Subsurface Flow ◽  
Operating Conditions ◽  
Cod Removal ◽  
Variable Loading ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Sand Filter ◽  
Subsurface Flow Constructed Wetlands

This paper documents the performance of a subsurface-flow constructed wetlands system during its initial five years of operation under variable loading and operating conditions associated with a northern midwestern US climate. The results indicate that effective and sufficient CW seasonal removals of TSS, VSS, CBOD5, COD, and fecal coliform were achieved. Wastewater temperatures seemed to affect CBOD5 and COD removal rates. Nitrogen and phosphorus reductions were not as effective and varied seasonally, as well as with wastewater temperature. The addition of a sand filter, to aid in further nitrification and disinfection following CW treatment, markedly improved the performance of the wetlands system. After a few years of operation, the remarkable performance of the CW system was dampened by apparent clogging and subsequent eruption of wastewater at the head-end of the treatment cells. While clogging was partially caused by biomass build-up in the wetlands substrate, visual observations suggest that excessive vegetation coupled with relaxed maintenance may also be responsible for clogging.

Preliminary investigation of the potential of four tropical emergent macrophytes for treatment of pre-treated pulp and papermill wastewater in Kenya

2003 ◽  
Vol 48 (5) ◽  
pp. 223-231 ◽  
Author(s):  
M.A. Abira ◽  
H.W. Ngirigacha ◽  
J.J.A. van Bruggen
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Preliminary Investigation ◽  
Dry Weight ◽  
Batch Reactors ◽  
Nitrogen And Phosphorus ◽  
Emergent Macrophytes ◽  
Paper Mills ◽  
Plant Nitrogen ◽  
Appropriate Treatment

The potential of four aquatic macrophytes for treatment of wastewater in constructed wetlands was investigated in bucket mesocosms at Pan African Paper Mills (E.A) Limited. The buckets were operated as semi-continuous batch reactors with reversed vertical flow for a period of 3 months. Four treatments were applied involving two hydraulic retention times (HRT) and two wastewater concentrations. Plants appeared healthier and greener in treatments at HRT5 than at HRT10. Cyperus immensus and Typha domingensis had higher biomass gain compared to the other two species. Plant nitrogen and phosphorus content, based on dry weight, was lower at the end of the experiment than at the beginning in all treatments for all species. The removal efficiency achieved for COD ranged from 10 to 55% for planted buckets at HRT5 and 15 to 65% at HRT10 for similar buckets. The mean percentage COD removal in unplanted buckets was significantly lower than in planted ones. TSS removal efficiency ranged from 44-86%. Buckets planted with Typha exhibited the highest removal efficiency in all treatments. Those at HRT5 showed significantly higher removal efficiencies than those at HRT10 for all species. The results indicate that the plants are suitable for use in constructed wetlands for treatment of the wastewater provided the appropriate treatment is applied.

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