Comparative evaluation of low cost materials as constructed wetland filling media

2017 ◽  
Author(s):  
Henrique J. O. Pinho ◽  
Mafalda M. Vaz ◽  
Dina M. R. Mateus
Keyword(s):  
Constructed Wetland ◽  
Comparative Evaluation ◽  
Low Cost

Treatment of wastewater by constructed wetland in small settlements

2000 ◽  
Vol 41 (1) ◽  
pp. 69-72 ◽  
Author(s):  
S.Ç. Ayaz ◽  
I. Akca
Keyword(s):  
Environmental Pollution ◽  
Constructed Wetland ◽  
Pilot Plant ◽  
Low Cost ◽  
Experimental System ◽  
Suspended Solid ◽  
Loading Conditions ◽  
Treatment Performance ◽  
Per Capita ◽  
One Year

The constructed wetland is a low-cost technology to control environmental pollution. The system is especially suitable for small settlements. An innovative constructed wetland technology is described in this paper. A pilot plant was used to assess the performance of the system. The experimental system consists of two serial connected tanks that settled up with fillers and Cyperus as treatment media. Wastewater is recycled periodically upward and downward between the two tanks. The treatment performance was monitored in different loading conditions in a one-year period. The average COD removal efficiency of 90% was observed at 122 g COD/m2.day average loading conditions. Other average removal values in the same conditions are as follows: suspended solid 95%, TKN 77%, total nitrogen 61%, PO4-P 39%. The land requirement for this system will be 0.82 m2 per capita when applying as full-scale system.

scholarly journals Comparative evaluation of artificial rupture of membranes and spontaneous rupture of membranes on course of labour and feto-maternal outcomes

2020 ◽  
Vol 9 (10) ◽  
pp. 4160
Author(s):  
Anjali Chauhan ◽  
Bani Sarkar ◽  
Kritika Tanwar
Keyword(s):  
Apgar Score ◽  
Spontaneous Rupture ◽  
Comparative Evaluation ◽  
Low Cost ◽  
Mode Of Delivery ◽  
Cost Effective ◽  
Maternal Outcomes ◽  
Group Outcomes ◽  
Significant Difference ◽  
Nicu Admission

Background: Present study was undertaken to do a comparative evaluation of artificial rupture of membrane (ARM) and spontaneous rupture of membrane (SRM) on the course of labour and feto-maternal outcome.Methods: It was prospective interventional randomized comparative study including 120 primigravidae (60 in ARM and SRM group each) with cervical dilatation ≥3 cm and intact membranes. Amniotomy was performed in ARM group after enrolment while no intervention in SRM group. Outcomes noted were duration of labor, mode of delivery, APGAR score, NICU stay.Results: Significant reduction seen in duration of labour in ARM group (p=0.0001). Mean duration of labor was 5.24 hours in ARM group while 6.94 hours in SRM group. No significant difference noted in mode of delivery (p=0.082). No significant adverse feto-maternal outcomes were seen with amniotomy. APGAR score and NICU admission had no significant difference among the two groups.Conclusions: ARM can be opted as an intervention with shorter duration of labour without adversely affecting the feto-maternal outcomes. It is safe, reliable and cost effective modality when employed in primigravida and may be considered as a low-cost accessible intervention to reduce prolonged labour and its associated complications. 

scholarly journals Effect of oxygen states in horizontal subsurface flow constructed wetlands on the removal of organic matter, nutrients, some metals and octylphenol

2019 ◽  
Vol 20 (K9) ◽  
pp. 45-52
Author(s):  
An Truong Nguyen ◽  
Tam Minh Thi Le ◽  
Viet Quoc Tran ◽  
Viet Ngoc Truong ◽  
Luan Thanh Nguyen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nitrogen Removal ◽  
Constructed Wetland ◽  
Low Cost ◽  
Subsurface Flow ◽  
Ho Chi Minh City ◽  
Design Parameters ◽  
Endocrine Disrupting Chemical ◽  
University Of Technology ◽  
Horizontal Subsurface Flow

Constructed wetland is a low cost, effective technology and it is still in the state of improvement to enhance the treatment efficiency, especially in nutrient and trace elements treatment. This study investigated the effect of aerobic and anoxic conditions in Horizontal Subsurface Flow Constructed Wetland (HSFCW) on nutrient, organic, metal and Octylphenol - OP (Endocrine disrupting chemical) treatment. Two HSFCWs were constructed: HSFCW1 with three aerobic compartments; HSFCW2 with two aerobic compartments, one anoxic compartment. The two HSFCWs had the same design parameters (fiters, plants), except oxygen conditions. The results showed that aerobic and anoxic HSFCW may increase the efficiency of Nitrogen removal by 10%, but decreased by 11% in the efficiency of OP treatment (one of the EDCs). The efficiency of treatment of pollutants, including NH4+-N, COD, TP, Mn, Fe, Al and Cu between two HSFCWs were not significantly different; the average efficiency was 99%, 84%, 97%, 96%, 96%, 72% and 73%, respectively. Therefore, the anoxic compartment of HSFCW still provided the effective removal of organic matter, Manuscript received September 29th, 2017; accepted 24th December, 2017 This study was funded by CARE RESCIF under grant number Tc-TTC-2017-05. An Truong Nguyen, Tam Minh Thi Le, Viet Quoc Tran, Trang Huyen Thi Nguyen are with the CARE, Ho Chi Minh City University of Technology, VNU-HCM, Vietnam ([email protected], [email protected], [email protected]) Viet Ngoc Truong, Luan Thanh Nguyen, Phi Hoang Tan Nguyen are with the Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology, VNU- HCM, Vietnam ([email protected]) metals and octylphenol, but it also improved nitrogen removal efficiency by up to 92%.

Comparative Evaluation of New Low-Cost Particulate Matter Sensors

2021 ◽  
Author(s):  
Ishan Patwardhan ◽  
Spanddhana Sara ◽  
Sachin Chaudhari
Keyword(s):  
Particulate Matter ◽  
Comparative Evaluation ◽  
Low Cost

Comparative Evaluation of Efficiency of Metal-Cutting Tool by Method of Pendulum Scribing

2015 ◽  
Vol 798 ◽  
pp. 452-456 ◽  
Author(s):  
Boris Y. Mokritskii ◽  
Dmitriy A. Pustovalov ◽  
Alexey Anatolevich Vereschaka
Keyword(s):  
Material Properties ◽  
Comparative Evaluation ◽  
Metal Cutting ◽  
Cutting Tool ◽  
Low Cost ◽  
Tool Material ◽  
Maximum Width ◽  
Tool Materials ◽  
Metal Cutting Tool ◽  
The Relationship

Method of pendulum scribing was investigated in terms of the possibilities of using this method as a simple-to-use way with a relatively low cost for rapid evaluation of tool material properties. It has been established that by using this method the conditions of loading of the tool material are closest to the real conditions in which the tool operates. Was revealed the relationship between the maximum width and length of the track pendulum scribing and physico-mechanical properties of tool materials. Application of the proposed methodology allows passing to predicting the performance properties of the tool, such as tool life under the specified conditions.

scholarly journals Study on the efficiency of continuous flow-based constructed wetland system for grey water treatment

2017 ◽  
Vol 3 (5) ◽  
pp. 52
Author(s):  
Rengaraj Chithra Devi ◽  
Nirmaladevi D. Shrinithivihahshini ◽  
Rajendran Viji
Keyword(s):  
Water Treatment ◽  
Water Resources ◽  
Fresh Water ◽  
Constructed Wetland ◽  
Continuous Flow ◽  
Low Cost ◽  
Oxygen Demand ◽  
Total Alkalinity ◽  
Grey Water ◽  
Wetland System

Water is inevitable for our life. Due to the population growth, there is a tremendous pressure on the existing fresh water resources such as surface water and ground water. Increasing water demand and improper usage of potable water lead to scarcity of fresh water resources. Globally, treating grey water is a real constraint to minimize the problem of water scarcity. The continuous flow-based constructed wetland system for grey water treatment is a technique for reusing the domestic grey water and it is a low-cost method. The current study was aimed to evolve a suitable user-friendly treatment system for handling the household grey water. In the present study, grey water has been collected from the Bharathidasan University and it has been treated with biofiltration and rhizhodegradation techniques using continuous flow-based constructed wetland system. The system has been found as more effective for treating the Physico-chemical parameters such as suspended solids, pH, electrical conductivity, TS, TDS, DO, BOD, COD, TOC, CO3, HCO3, SO4, NO3, PO4, Ca, Mg, Na, K, total hardness, calcium hardness, chloride, and total alkalinity. The results reported the reduction in the biological oxygen demand (89%), chemical oxygen demand (81%), DO (95%), carbonate (100%), sodium (65%), and potassium (85%).It also examined the benefits and risks associated with the results in the reuse of domestic grey water for the purpose of vegetable gardening, irrigation, and toilet flushing. Consequently, this biofiltration method is natural, simple, and low cost-effective treatment in a holistic manner.

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