scholarly journals The Optimal Planting Coverage Rate and Wastewater Concentration for Water Spinach Floating Bed on Geese Wastewater Purification

2021 ◽  
Author(s):  
Xiaofeng Huang ◽  
Zhuping Chen ◽  
Zuolan Liu ◽  
Jiajia Xue ◽  
Ying Chen ◽  
...  
Keyword(s):  
Coverage Rate ◽  
Water Spinach ◽  
Wastewater Purification

Comparative study of domestic wastewater treatment efficiencies between facultative pond and water spinach pond

1995 ◽  
Vol 32 (3) ◽  
pp. 263-270 ◽  
Author(s):  
Seni Karnchanawong ◽  
Jaras Sanjitt
Keyword(s):  
Growth Rates ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Organic Content ◽  
Water Spinach ◽  
Removal Rates ◽  
Mass Removal ◽  
Loading Rates ◽  
Tropical Conditions ◽  
Average Water

Two pilot-scale studies were comparatively conducted under tropical conditions during December 1992 to September 1993. One study involved facultative ponds(FP) and the others water spinach ponds(SP). Four rectangular concrete ponds, 0.8 m × 2.4 m × 1.1 m (width × length × depth), were employed to treat the Chiang Mai University campus wastewater. Water spinach (Ipomoea aquatica) was planted in two of the ponds. The influent characteristics noted showed a low organic content, i.e. BOD 25.4-29.9 mg/l, with BOD:N ratio around 1:1. The investigations were conducted using the following hydraulic retention times (HRT): 1.6, 2, 2.7, 4, 8 and 16 d. The results showed that the BOD, COD and SS mass removal rates increased as the mass loading rates increased and the SP was significantly more effective in reducing the organic content than the FP. No relationship was found between TN mass removal and the loading rates. However, the TP mass removal rates in the SP and the FP were rather low and were considered to be insignificant. It was observed that SS accumulated in the water spinach root systems which tended to act as a strainer. This process led to plant growth inhibition and finally die-off. The average water spinach growth rates varied from 37 to 107 g wet wt./(m2.d) and no relationship was established between the growth rates and the HRT.

scholarly journals Potential Risk of Consuming Vegetables Planted in Soil with Lead and Cadmium and the Influence on Vegetable Antioxidant Activity

2021 ◽  
Vol 11 (9) ◽  
pp. 3761
Author(s):  
Wen-Lii Huang ◽  
Wei-Hsiang Chang ◽  
Shu-Fen Cheng ◽  
Huai-Yuan Li ◽  
Hsiu-Ling Chen
Keyword(s):  
Sweet Potato ◽  
Contaminated Soils ◽  
Vegetable Consumption ◽  
Accumulation Rate ◽  
Leafy Vegetables ◽  
Water Spinach ◽  
Potato Leaf ◽  
Cd Accumulation ◽  
Lead And Cadmium ◽  
Cd Exposure

Once in soil and water, metals can enter the food chain, and the consumption of contaminated crops can pose a serious risk to human health. This study used pot experiments to evaluate the accumulation of metal elements and their influence on levels of antioxidants in vegetables. The current study clearly demonstrates that metals accumulated in the five vegetables that were planted in the contaminated soils, especially so for water spinach. Cd accumulation of all of the vegetables planted in the contaminated soils was greater Cu. The low accumulation rate that was seen in sweet potato leaf, potato, and tomato indicated their suitability for planting in suspected contaminated soil, such as at farms nearby metal industries, in replacement of high accumulators, such as leafy vegetables. The non-carcinogenic HI of Cd exposure from water spinach and sweet potato were >1, whereas those for Cu were <1. This study suggests that residents may experience health risks due to vegetable consumption, and that children are vulnerable to the adverse effects of heavy metal ingestion.

scholarly journals Preparation of Zn-MOFs by microwave-assisted ball milling for removal of tetracycline hydrochloride and Congo red from wastewater

2021 ◽  
Vol 10 (1) ◽  
pp. 125-133
Author(s):  
Qinhui Ren ◽  
Fuhua Wei ◽  
Hongliang Chen ◽  
Ding Chen ◽  
Bo Ding
Keyword(s):  
Ball Milling ◽  
Congo Red ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Tetracycline Hydrochloride ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Wastewater Purification ◽  
Microwave Assisted ◽  
Metal Organic

Abstract In this study, we prepared Zn-MOFs as an ordinary, low-cost, and efficiency method taking advantage of zinc(ii) acetate monohydrate and 1,3,5-benzenetricarboxylic acid in microwave-assisted ball milling. The Zn-MOFs were measured via scanning electron microscopy, infrared spectrometry, X-ray diffraction, and thermogravimetry. We explored its use as a photocatalyst for the degradation of tetracycline hydrochloride and Congo red from aqueous solutions. The results demonstrate that the kinetic model was appropriate for the removal of organic pollutants. In general, it is feasible, inexpensive, and effective to use metal organic framework (MOF) to treat waste liquid. Therefore, our findings indicate that Zn-MOFs have broad application vista in wastewater purification.

Comparative assessment of bioactive compounds, antioxidant capacity and nutritional quality of red seaweeds and water spinach

2021 ◽  
pp. 101878
Author(s):  
Md. Solaiman Hossain ◽  
Saad Al-din Sifat ◽  
M. Afzal Hossain ◽  
Sazlina Salleh ◽  
Mofazzal Hossain ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Bioactive Compounds ◽  
Nutritional Quality ◽  
Comparative Assessment ◽  
Water Spinach ◽  
Red Seaweeds

scholarly journals A Comprehensive Review of Polymeric Wastewater Purification Membranes

2021 ◽  
Vol 5 (6) ◽  
pp. 162
Author(s):  
Rasmeet Singh ◽  
Mandeep Singh ◽  
Nisha Kumari ◽  
Janak ◽  
Sthitapragyan Maharana ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Pore Formation ◽  
Inorganic Materials ◽  
Special Focus ◽  
Nanocomposite Membranes ◽  
Wastewater Purification ◽  
Comprehensive Review ◽  
Synthetic Membranes ◽  
Purification Membranes ◽  
Thermal And Chemical Stability

Synthetic membranes are currently employed for multiple separation applications in various industries. They may have been prepared from organic or inorganic materials. Present research majorly focuses on polymeric (i.e., organic) membranes because they show better flexibility, pore formation mechanism, and thermal and chemical stability, and demand less area for installation. Dendritic, carbon nanotube, graphene and graphene oxide, metal and metal oxide, zwitter-ionic, and zeolite-based membranes are among the most promised water treatment membranes. This paper critically reviews the ongoing developments to utilize nanocomposite membranes to purify water. Various membranes have been reported to study their resistance and fouling properties. A special focus is given towards multiple ways in which these nanocomposite membranes can be employed. Therefore, this review provides a platform to develop the awareness of current research and motivate its readers to make further progress for utilizing nanocomposite membranes in water purification.

scholarly journals Electrodegradation of Acid Mixture Dye through the Employment of Cu/Fe Macro-Corrosion Galvanic Cell in Na2SO4 Synthetic Wastewater

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4580
Author(s):  
Mateusz Kuczyński ◽  
Mateusz Łuba ◽  
Tomasz Mikołajczyk ◽  
Bogusław Pierożyński ◽  
Agnieszka Jasiecka-Mikołajczyk ◽  
...  
Keyword(s):  
Electrochemical Techniques ◽  
Electrical Energy ◽  
Galvanic Cell ◽  
Synthetic Wastewater ◽  
Acid Mixture ◽  
Ac Impedance Spectroscopy ◽  
Wastewater Purification ◽  
Physical Chemical ◽  
Iron Anode ◽  
Biological Methods

Traditional wastewater purification processes are based on a combination of physical, chemical, and biological methods; however, typical electrochemical techniques for removing pollutants require large amounts of electrical energy. In this study, we report on a process of wastewater purification, through continuous anodic dissolution of iron anode for aerated Cu/Fe galvanic cell in synthetic Na2SO4 wastewater solution. Electrochemical experiments were conducted by means of a laboratory size electrolyzer, where electrocoagulation along with electrooxidation phenomena were examined for wastewater containing Acid Mixture dye. The above was visualized through the employment of electrochemical (cyclic voltammetry and ac impedance spectroscopy techniques) along with instrumental spectroscopy analyses.

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