A Study on Water Hyacinth Purifying Effect on Different Levels of Eutrophic Water

2014 ◽  
Vol 955-959 ◽  
pp. 1899-1902
Author(s):  
Su Chen ◽  
Lei Chao ◽  
Ning Chen ◽  
Lin Shan Wang ◽  
Xin Liu ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Water Hyacinth ◽  
Removal Rate ◽  
Dry Weight ◽  
Total Biomass ◽  
Removal Rates ◽  
Initial Concentration ◽  
Eutrophic Water ◽  
Different Levels

In this experiment, water hyacinth presents a good purification effect in five kinds of eutrophic waters with initial total nitrogen (TN) and total phosphorus (TP) concentrations in between 8.34~20.45 mg/L and 0.78~1.51 mg/L. After two weeks of purification, TN and TP concentrations of eutrophic waters are reduced to 1.78~5.68 mg/L and 0.25~0.312 mg/L, and TN and TP removal rates are 72.22~78.65% and 67.95~79.34%. Water hyacinth’s TN removal rate decreases as TN initial concentration increases; TP removal rate increases as TP initial concentration increases. Water hyacinth’s average total biomass in eutrophic water has increased by 0.944~1.084 kg/m2, and the average bio-dry-weight has increased by 0.0470~0.0547 kg/m2. The average total biomass and average bio-dry-weight of water hyacinth increase as the eutrophication deepens.

Effects of pH and Illumination on Removing Nitrogen and Phosphorus in Eutrophic Water by Purple-Root Water Hyacinth

2013 ◽  
Vol 807-809 ◽  
pp. 1690-1694 ◽  
Author(s):  
Ju Hong Zhan ◽  
Qiang Li ◽  
Qian Cai ◽  
Yi Ran Ding ◽  
Ting Ting Zhao ◽  
...  
Keyword(s):  
Water Hyacinth ◽  
Theoretical Foundation ◽  
Removal Rate ◽  
Water Bodies ◽  
Nitrogen And Phosphorus ◽  
Removal Rates ◽  
Illumination Time ◽  
Eutrophic Water ◽  
Effects Of Ph

Phytoremediation is the most commonly selected option for decontaminating the nutrients in eutrophic water bodies in recent years. In the present study, the effects of pH and illumination time on removing nitrogen and phosphorus by purple-root water hyacinth were investigated. The results indicate that there would be a better removal rates of nitrogen and phosphorus under the condition of pH=6~7 and t=8~10 h. Both acid and alkali conditions would slow down the purification effects and increasing illumination time can not improve the removal rate remarkablely. Therefore, it provides an important theoretical foundation for the efficient use of purple-root water hyacinth to restore eutrophic water bodies.

Combining artificial aeration and biological zeolite mulch for nitrogen removal from eutrophic water bodies

2020 ◽  
Vol 15 (1) ◽  
pp. 151-159
Author(s):  
Cheng Lu ◽  
Wen Cheng ◽  
Min Wang ◽  
Zhiwei Zhou
Keyword(s):  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Removal Rate ◽  
Nitrogen Concentration ◽  
Combined Treatment ◽  
Ammoniacal Nitrogen ◽  
Nitrogen Species ◽  
Artificial Aeration ◽  
Total Nitrogen Concentration ◽  
Eutrophic Water

Abstract Endogenous nitrogen pollution can be a major cause of eutrophication. Nitrogen species release from sediments can be reduced by biologically-enforced zeolite mulch or water column aeration. This study was about their combined effects. Water and surface sediment samples from the Yangzhou ancient canal were aerated and biozeolite mulching was applied separately and in combination for 81 days, while the nitrogen species removal rate was recorded. The combination of aeration and biozeolite mulching removed >95% of the ammoniacal-nitrogen in 15 days. This was better than either the blank control or biozeolite mulch without aeration. The ammoniacal-nitrogen concentration was lowered faster by combined treatment than by aeration alone. Nitrate nitrogen was only detected during aeration between days 10 and18, and reached lower concentration in the presence of biozeolite. Nitrate was formed during aeration but its concentrations were higher and more variable in the absence of biozeolite; that is, mulching stabilized nitrate formation. The total nitrogen concentration reached its lowest levels after 81 days with biozeolite treatment alone, with 78% total nitrogen removal, whereas combined aeration with biozeolite achieved 41%. This shows that biozeolite mulching can remove nitrogen in eutrophic waters, even without aeration.

scholarly journals Aspergillus spp. and Bacillus spp. as Growth Promoters in Cotton Plants Under Greenhouse Conditions

2021 ◽  
Vol 5 ◽  
Author(s):  
Paola Andrea Escobar Diaz ◽  
Oniel Jeremias Aguirre Gil ◽  
Carlos Henrique Barbosa ◽  
Nicolas Desoignies ◽  
Everlon Cid Rigobelo
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Dry Matter ◽  
Respiratory Activity ◽  
Dry Weight ◽  
Lower Amount ◽  
Growth Promoters ◽  
Phosphorus Absorption ◽  
Aspergillus Brasiliensis ◽  
Cotton Plants

This study aimed to verify the potential of three Aspergillus and Bacillus species as growth promoters in cotton plants under greenhouse conditions. The experiment was conducted with a completely randomized design with seven treatments (six microorganisms plus one control) and five replicates until the flowering stage at 70 days after emergence. The inoculation of cotton plants with Bacillus velezensis (Bv188) and Bacillus subtilis (Bs248 and Bs290) had a positive effect on total nitrogen extraction (899.31, 962.18, and 755.41 mg N/kg dry matter, respectively) compared to the control (459.31 mg N/kg dry weight), total phosphorus extraction (121.94, 124.31, and 99.27 mg P/kg dry matter, respectively) compared to the control (65.10 mg P/kg dry matter), and total dry matter (41.08, 43.59, and 49.86 g/plant, respectively) compared to the control (26.70 g/plant), as well as biomass carbon (72.26, 35.18, and 14.7 mg/kg soil, respectively). Cotton plants inoculated with Aspergillus brasiliensis (F111), Aspergillus sydowii (F112), and Aspergillus sp. (versicolor section) (F113) had higher total nitrogen extraction (953.33, 812.59, and 891.62 mg N/kg dry matter, respectively) compared to the control (459.31 mg N/kg dry matter), a higher total phosphorus (122.30, 104.86, and 118.45 mg P/kg dry matter, respectively) compared to the control (65.10 mg P/kg dry matter), a higher total dry matter (37.52, 37.41, and 53.02 g/plant) compared to the control (26.70 g/plant), and greater respiratory activity (14.98, 10.43, and 7.11 mg CO2/100 g soil, respectively) compared to the control (3.5 mg CO2/100 g soil). The fungi A. brasiliensis (F111) and A. sydowii (F112) promoted higher phosphorus absorption by cotton plants, which was reflected by the lower amount of nutrients in the soil (7.10 and 16.96 g P/dm3 soil) than in the control (26.91 g P/dm3 soil). The results suggest that B. subtilis 248 promoted an increase in phosphorus extracted from the roots and total and phosphorous compounds from the root dry matter and increased the value of soil respiratory activity, and this bacterium could be used as an inoculant in cotton crops.

scholarly journals Seasonal dynamics of Zooplankton functional groups in relation to environmental variables in Xiquanyan Reservoir, Northeast China

2018 ◽  
Vol 54 ◽  
pp. 33
Author(s):  
Patteson Chula Mwagona ◽  
Ma Chengxue ◽  
Yu Hongxian
Keyword(s):  
Functional Groups ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Environmental Variables ◽  
Water Transparency ◽  
Functional Feeding Groups ◽  
Total Biomass ◽  
Top Down ◽  
Community Group ◽  
Filter Feeders

In this study, the concept of functional feeding groups was used to classify and model the seasonal variation of zooplankton functional groups in relation to environmental variables. A total of 48 zooplankton species were observed in the reservoir and grouped into 8 functional groups. Both environmental variable and the biomass of zooplankton functional groups vary spatially and seasonally. Water temperature, water transparency, total nitrogen and nitrates were significantly higher in summer, while chlorophyll-a and ammonium were higher in autumn and spring, respectively. Biomass of zooplankton was significantly higher in summer (245.81 μg/L), followed by autumn (196.54 μg/L) and spring (54.25 μg/L). Group RF (rotifer filter feeders) dominated in spring, accounting for 80% of the total biomass. In summer and autumn, group RC (rotifer carnivore) and SCF (small copepods and cladocerans filter feeders) were the dominant, respectively. Total nitrogen, total phosphorus, ammonium, chlorophyll-a and water transparency were the major factor influencing zooplankton community. Group RF was positively influenced by ammonium and total phosphorus, while RC, SCF and MCF (middle copepods and cladocerans filter feeders) were positively correlated with chlorophyll-a. Top-down control of phytoplankton by groups RC, SCF and MCF in Xiquanyan reservoir is not strong enough to produce negative effect. Increase in predator size biomass did not strengthen top-down control on prey. It is quite clear that the zooplankton function groups of Xiquanyan reservoir followed a predictable seasonal pattern. This therefore highlights the significance of environmental variables in structuring plankton composition in the reservoir.

Application of Anaerobic Fermentation Technology in Prevent and Control Pollution of Livestock and Poultry

2013 ◽  
Vol 850-851 ◽  
pp. 1176-1179
Author(s):  
Yu Kun Ji ◽  
Hong He
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Anaerobic Fermentation ◽  
Removal Rate ◽  
Pollutant Concentration ◽  
And Control ◽  
Fermentation Technology ◽  
Better Than

Analysis different kinds of anaerobic fermentation technology using in prevent and control of livestock and poultry. Comparing removal rate of COD, total Nitrogen, total Phosphorus of Mixed anaerobic fermentation technology (CSTR), upflow sludge bed reactor (USR) and simple anaerobic pool. Removal rate of CSTR and USR is obvious better than simple an aerobic pool, and removal rate is proportional to the pollutant concentration. Overall evaluations of investment, occupation of land and rate. Points out the problems exist in the using of anaerobic fermentation technology and put forward reasonable suggestions.

Removal of bisphenols by slow sand filtration

2009 ◽  
Vol 9 (3) ◽  
pp. 263-268 ◽  
Author(s):  
K. Katayama-Hirayama ◽  
S. Arai ◽  
T. Kobayashi ◽  
H. Matsuda ◽  
Z. Luo ◽  
...  
Keyword(s):  
Removal Rate ◽  
Molecular Orbital Calculation ◽  
Photocatalytic Reaction ◽  
Sand Filtration ◽  
Removal Rates ◽  
Sand Filter ◽  
Slow Sand Filtration ◽  
Initial Concentration ◽  
Slow Sand Filter ◽  
High Removal Rate

A compensating effect in the reduction of bisphenols (BPs) has been shown using biodegradation in slow sand filtration and advanced photocatalysis. We tried to remove 8 kinds of BP by slow sand filtration. Removal rates of BPA, BPB, BPE, BPF, BPS, thiobisphenol (TBP), and dihydroxybenzophenone (DHB) indicated a high removal rate up to more than 90% at an initial concentration of 100 μg/L, whereas the removal rate of BPP was only 30%. We also examined removal of BPs by Pt-loaded porous photocatalyst under visible light irradiation. Removal rates of BPA, BPB, BPE, BPF, BPP, and TBP showed high removal rates up to more than 90% at an initial concentration of 10 mg/L. Removal of BPS and DHB was relatively low at 20% and 30%, respectively. Removal of BPP was low in slow sand filtration, but Pt-loaded photocatalyst removed BPP effectively. Removal of BPS was low with Pt-loaded photocatalyst, but slow sand filtration removed BPS effectively. The combination of a slow sand filter and Pt-loaded photocatalyst may be helpful to degrade BPs. The magnitude of decomposition of BPs by photocatalytic reaction may be related to electrophilic frontier density. But the degradability of BPs in slow sand filtration is not the same as that in photocatalytic reaction with Pt-loaded titanium dioxide. The biodegradability of BPs by slow sand filtration cannot be explained by molecular orbital calculation.

Treating the Eutrophic Water by Ultrasonic – Flocculation Sedimentation

2013 ◽  
Vol 662 ◽  
pp. 445-448 ◽  
Author(s):  
Lin Zhuan Ma ◽  
Zhi Ying Wang ◽  
Jun Ming Guo ◽  
Qiong Fang Cui ◽  
Man Hong Liu ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Industrial Production ◽  
Living Standards ◽  
Dianchi Lake ◽  
Eutrophic Water ◽  
Better Than

With the development of industrial production and the improvement people's living standards, all kinds of discharged wastewater cause serious pollution for nitrogen and phosphorus.In this study, the water of Dianchi lake was treated by Ultrasonic – flocculation. The results show ultrasound-flocculation sedimentation is better than only flocculation sedimentation in removing the total phosphorus, total nitrogen and reducing COD, BOD and turbidity respectively increased 16.19%, 12.71%, 9.1%, 20%, 18.3%.

Experiences on dual media filtration of WWTP effluent

2011 ◽  
Vol 63 (10) ◽  
pp. 2462-2469 ◽  
Author(s):  
S. M. Scherrenberg ◽  
P. Postma ◽  
R. Neef ◽  
H. W. H. Menkveld ◽  
M. Bechger ◽  
...  
Keyword(s):  
Total Nitrogen ◽  
Total Phosphorus ◽  
Removal Rate ◽  
Treatment Plant ◽  
Phosphorus Concentration ◽  
Stable Operation ◽  
Total Phosphorus Concentration ◽  
Target Value ◽  
Wwtp Effluent ◽  
N Removal

This research is legislation driven by the European Water Framework Directive (WFD) and the Dutch Fourth Memorandum on Water Management. The objective of this research is to achieve the removal of total nitrogen and total phosphorus by Dual Media Filtration. The target value during this research for total nitrogen is 2.2 mg/L and for total phosphorus 0.15 mg/L. The results show that for NOx-N concentrations in the WWTP effluent up to 10 mg/L, a stable operation of the process can be reached with removal rates of 80% to 90%. The maximum nitrogen removal rate was 3.5 kg N/(m3.d). Above 10 mg/L a risk of filter bed clogging occurred. When the orthophosphorus concentration in the WWTP effluent exceeds the maximum of 0.3 mg/L, the total phosphorus concentration in the filtrate water will exceed the target value of 0.15 mg P-total/L. Temperature has a large impact in the phosphorus removal; the optimum temperature range is within 13°C–18°C. In conclusion, Dual Media Filtration is capable of producing reusable water with total phosphorus concentrations of <0.15 mg/L, under the condition that the wastewater treatment plant produces WWTP effluent with steady concentrations for orthophosphorus (<0.3 mg PO4-P/L). To reach total nitrogen concentrations in the filtrate water of <2.2 mg/L a NOx-N removal efficiency of nearly 100% is required.

The Analysis of Nitrogen Removal Performance for Eco-Ceramic Concrete Biofilm Reactors

2011 ◽  
Vol 418-420 ◽  
pp. 1002-1007
Author(s):  
Ming Yan Shi ◽  
Hai Liang Zheng ◽  
Jia Yu Liu ◽  
Can Qiang Xiao
Keyword(s):  
Water Temperature ◽  
Total Nitrogen ◽  
Nitrogen Removal ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Dry Weight ◽  
Unit Mass ◽  
Removal Rates ◽  
Biofilm Reactors ◽  
Good Ability

In order to achieve high efficiency of biofilm and removing nitrogen with low consumption, people have developed a new eco-ceramic concrete filler, used for the denitrification in treating municipal wastewater. When the water temperature is 25 ~ 30°C, the pH of influent is 7.0 ~ 7.5, the concentration of DO is 2.5 ~ 3.0mg /L, and the removal rates of COD, ammonia and total nitrogen are 78.6 ~ 91.8%, 83.4 ~93.6% and 63.4 ~ 73.8 % respectively. The removal of the pollutants mainly concentrates on the front and center of the reactor. We can also draw a conclusion from the experiment that, SOUR, the dry weight of biofilm and the thickness of biofilm present a pattern of diminishing along the corridor. The average decreasing ratio of each filler are 0.81%, 1.3% and 1.05%, respectively. And the activity of per unit mass of biofilm has increased along the corridor, and the end of it is 51.5% more than the front, which indicates that the system has good ability of resistance.

Study on the Rehabilitation of Eutrophic Water by Bacillus–Matrix–Plant Integrated System

2012 ◽  
Vol 599 ◽  
pp. 378-382 ◽  
Author(s):  
Xian Zhi Lu ◽  
Jian Chao Hao ◽  
Hui Fen Liu ◽  
Xiu Ping Tian
Keyword(s):  
Removal Efficiency ◽  
Removal Rate ◽  
Matrix Material ◽  
Integrated System ◽  
Ceratophyllum Demersum ◽  
Removal Rates ◽  
Iris Pseudacorus ◽  
Eutrophic Water ◽  
Significant Difference ◽  
The Matrix

Abstract. Caisson, which is composed of box, matrix and plant, plays an important role in the removal of SRP (solubility reaction phosphorus), NH4+-N and CODCr in eutrophic water. Bacillus can improve water quality effectively. Bacillus and caisson combination can further improve purification efficiency of wastewater. In this study, bacillus was added to the caisson to purify the aquaculture ponds water and removal efficiency of SRP, NH4+-N, CODCr was analyzed. The results showed that bacillus adding proportion had bigger effects on the removal rate of SRP than those of the matrix material and plant collocation, while, the matrix material had more removal efficiency on NH4+-N and CODCr than the bacillus adding proportion and plant collocation. The removal rates of SRP, NH4+-N and CODCr in the wastewater treated with 1‰ and1.5‰ bacillus were significantly higher than 0.5‰, but no significant difference was observed between1‰ and 5‰ bacillus treatments; among the three matrices of limestone, ceramsite and medical stone, the removal rate of SRP was highest in the treatment with medical stone, while the removal rates of NH4+-N and CODCr was highest in the treatment with ceramsite; there were significant differences in the removal rates of SRP, NH4+-N and CODCr between different plant configurations. The removal rate of SRP was up to 80.73% by the combination of bacillus (1‰), limestone, Cyperus alternifolius and Iris pseudacorus; the removal rates of NH4+-N and CODCr were 63.63% and 63.45% by the combination of bacillus (1.5‰), ceramsite, Ceratophyllum demersum and Iris pseudacorus respectively.

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