scholarly journals Study on treatment of domestic wastewater of an area in Tu Liem district, Hanoi, by water hyacinth

2014 ◽  
Vol 6 (2) ◽  
pp. 126-131
Author(s):  
Khanh Huy Pham ◽  
Pham Hong Lien Nguyen
Keyword(s):  
Water Hyacinth ◽  
Aquatic Plant ◽  
Agricultural Land ◽  
Domestic Wastewater ◽  
Treatment Method ◽  
Residential Areas ◽  
Natural Treatment ◽  
The Right ◽  
Autumn And Winter ◽  
Environmental Landscape

Domestic wastewater is one of the most interested environmental issues in Vietnam, especially in big cities and suburban residential areas. Most of the wastewater was not treated in the right way before discharging to environment. In this research, the author used water hyacinth as a main aquatic plant in aquatic pond model to treat wastewater. The experiment was operated continuously in 1 year with hydraulic retention time (HRT) is 11 and 18 days. Hydraulic loading rate (HRL) is 300 and 500 m3/ha/day, respectively. Treatment efficiency of the model for TSS is 90% (remaining 6 -12mg/l); COD, BOD5 is 63 - 81% (remaining 10 - 48mg/l); TP is 48 – 50% (remaining 3.5 - 9.8mg/l); TKN is 63 - 75% (remaining 8 - 17mg/l). Polluted parameters in effluent were lower than A and B levels of Vietnam standard QCVN 14: 2008/BTNMT and QCVN 40: 2011/BTNMT. The doubling time of water hyacinth in summer is 18days, and in autumn and winter is 28.5 days. Experiment results showed that we can use water hyacinth in aquatic pond to treat domestic wastewater with medium scale. We can apply this natural treatment method for residential areas by utilizing existing natural ponds and abandoned agricultural land with capacity up to 500m3/ha day. However, to get better efficiency we should combine with other aquatic plant species to treat wastewater and improve environmental landscape. Nước thải – xử lý nước thải sinh hoạt hiện đang là một trong những vấn đề môi trường được quan tâm tại Việt Nam nhất là tại các thành phố lớn và các khu dân cư. Hầu hết lượng nước thải chưa được xử lý đúng cách trước khi thải ra môi trường. Trong nghiên cứu này, tác giả sử dụng mô hình hồ thủy sinh và sử dụng cây Bèo lục bình để xử lý nước thải sinh hoạt của một khu dân thuộc huyện Từ Liêm, tại khu vực này nước thải bị thải trực tiếp vào sông Nhuệ. Thực nghiệm đã được tiến hành trong khoảng thời gian một năm, trải qua các mùa của khu vực miền Bắc với hai chế độ vận hành HRT là 18 và 11 ngày, tương ứng với tải trọng thủy lực HRL là 300 và 500 m3/ha/ngày. Kết quả cho thấy mô hình thủy sinh sử dụng cây bèo lục bình cho kết quả tốt, hiệu suất xử lý với các chất ô nhiễm đạt được như sau: chất rắn lơ lửng đạt 90%, COD, BOD5 đạt 63 - 81%, Phốt pho tổng giảm tới 48 - 50%, Nitơ tổng giảm tới 63 - 75%. Hàm lượng các chất ô nhiễm trong nước thải đầu ra của mô hình đều thấp hơn ngưỡng A và B của các tiêu chuẩn QCVN 14: 2008/BTNMT và QCVN 40: 2011/BTNMT. Bên cạnh đó tác giả cũng đã xác định định được tốc độ sinh trưởng của cây bèo tại khu vực miền Bắc là 18 ngày vào mùa hè và 28.5 ngày vào mùa thu đông. Kết quả nghiên cứu cho thấy có thể sử dụng bèo lục bình để xử lý nước thải sinh hoạt, với qui mô vừa và nhỏ và nên áp dụng cho các khu vực ven đô, nông thôn nơi có diện tích đất rộng hoặc tại các hồ sinh thái của các khu đô thị. Tuy nhiên, để hiệu quả tốt hơn ta cần kết hợp với nhiều loại thực vật thủy sinh khác để ngoài tác dụng xử lý nước thải mà còn tạo cảnh quan môi trường xung quanh.

The efficient role of aquatic plant (water hyacinth) in treating domestic wastewater in continuous system

2015 ◽  
Vol 18 (7) ◽  
pp. 679-685 ◽  
Author(s):  
Shahabaldin Rezania ◽  
Mohd Fadhil Md Din ◽  
Shazwin Mat Taib ◽  
Farrah Aini Dahalan ◽  
Ahmad Rahman Songip ◽  
...  
Keyword(s):  
Water Hyacinth ◽  
Aquatic Plant ◽  
Continuous System ◽  
Domestic Wastewater ◽  
Plant Water

Application of Three Step-Biological Pond with the Use of Aquatic Plant for Post Treatment of Petroleum Wastewater in Vietnam

1991 ◽  
Vol 23 (7-9) ◽  
pp. 1503-1507 ◽  
Author(s):  
L. M. Triet ◽  
N. T. Viet ◽  
T. V. Thinh ◽  
H. D. Cuong ◽  
J. C. L. van Buuren
Keyword(s):  
Dissolved Oxygen ◽  
Activated Sludge ◽  
Residence Time ◽  
Aquatic Plants ◽  
Water Hyacinth ◽  
Aquatic Plant ◽  
Post Treatment ◽  
Cod Removal ◽  
Sludge Treatment ◽  
Purification Efficiency

The effluent from activated sludge treatment of petroleum wastewater was treated with the aid of a ponding system using aquatic plants (Water Hyacinth, Chlorella, Reed). A good result was obtained in this study. Pilot pond system shows that the purification efficiency depends on the residence time of about 14 days. The petroleum removal waa 97-98 %, the COD removal was from 88-93 %. The dissolved oxygen amount (with Chlorella) increased from 0.7 mg/l to 9.8 mg/l and the pH increased from 6.9 to 8-8.6. The application of 3 step biological pond with the use of Water Hyacinth, Chlorella, Reeds for post treatment of petroleum wastewater is appropriate in Vietnam.

Green Route for the Removal of Pb from Aquatic Environment

2020 ◽  
Vol 23 (7) ◽  
pp. 587-598 ◽  
Author(s):  
Ahmed Refaat ◽  
Hanan Elhaes ◽  
Nabila S. Ammar ◽  
Hanan S. Ibrahim ◽  
Medhat Ibrahim
Keyword(s):  
Molecular Modeling ◽  
Sodium Alginate ◽  
Water Hyacinth ◽  
Aquatic Plant ◽  
Cost Effective ◽  
Important Process ◽  
Green Route ◽  
Homogeneous Structures ◽  
Different Sources ◽  
Water Hyacinth Root

Aim and Objective: Wastewater treatment/remediation is a very important process that has a great environmental and economic impact. Therefore, it is crucial to innovate different methods to remove pollutants of different sources from wastewater. This work was conducted in order to study the removal of lead (Pb+2) from wastewater using microspheres of composites of sodium alginate, cellulose and chitosan, as well as using a cost-effective green route through composites of sodium alginate and dried water hyacinth. Materials and Methods: Molecular modeling at B3LYP/6-31g(d,p) was utilized to study sodium alginate, cellulose and chitosan. Sodium alginate was cross-linked with calcium chloride to form microspheres, then both sodium alginate/cellulose and sodium alginate/chitosan were also crosslinked as 50/50 to form microspheres. The roots of the aquatic plant water hyacinth in dry form were added to the cross-linked sodium alginate for up to 70%. SEM and FTIR were employed to study the surface of the prepared microspheres and their structures respectively. Atomic absorption spectroscopy was used to study the levels of Pb. Results: Molecular modeling indicated that the blending of such structures enhances their ability to bind with surrounding molecules owing to their ability to form hydrogen bonds. SEM results indicated that homogeneous structures of cellulose and chitosan are deformed when blended with sodium alginate, and FTIR confirmed the proper formation of the desired blends. Microspheres from sodium alginate showed the ability to remove Pb+2 from wastewater. SEM indicated further deformation in the morphology with the roughness of sodium alginate/water hyacinth microspheres, while FTIR confirmed the uniform matrices of the microspheres. The removal of Pb+2 was enhanced because of the addition of dried water hyacinth's roots. Conclusion: Modeling, experimental and kinetic data highlight sodium alginate/water hyacinth root as a green route to remediate Pb+2 from wastewater.

scholarly journals People’s Avoidance of Neighboring Agricultural Urban Green Infrastructure: Evidence from a Choice Experiment

2021 ◽  
Vol 13 (12) ◽  
pp. 6930
Author(s):  
Shinsuke Kyoi
Keyword(s):  
Spatial Econometrics ◽  
Green Infrastructure ◽  
Urban Areas ◽  
Choice Experiment ◽  
Online Survey ◽  
Agricultural Land ◽  
Residential Areas ◽  
Urban Green ◽  
Ishikawa Prefecture ◽  
Urban Green Infrastructure

This study evaluates people’s preferences regarding the proximity of their residence to agricultural urban green infrastructure (UGI), such as agricultural land and satoyama, and discusses the availability of these types of land as UGI. UGI is vital for reducing the negative environmental impacts of urban areas, as these impacts are too large to ignore. In this study, we conducted an online survey and a choice experiment to investigate people’s perceptions regarding the proximity of their residence to agricultural UGI (AUGI). The respondents of the choice experiment were 802 inhabitants of Ishikawa Prefecture, Japan, which has rich agricultural resources. To examine explicitly the spatial autocorrelation of people’s preferences, in this study, we used the spatial econometrics method. The main empirical findings are that people prefer agricultural land far away from their residence—more than 1000 m, not within 1000 m—which reflects the not-in-my-backyard phenomenon. Meanwhile, people’s preferences regarding proximity to satoyama are complicated and their preferences are positively spatially autocorrelated. The results indicate that policymakers and urban planners should manage and provide AUGI far away from residential areas; otherwise, they must address people’s avoidance of neighboring AUGI.

Ustawowe i umowne prawo pierwokupu przysługujące dzierżawcy nieruchomości rolnych – wybrane problemy prawne

2021 ◽  
pp. 375-394
Author(s):  
Aneta Suchoń
Keyword(s):  
Real Estate ◽  
Agricultural Land ◽  
Third Party ◽  
Agricultural System ◽  
Business Activity ◽  
Legal Regulations ◽  
Legal Problems ◽  
Agricultural Support ◽  
The Right ◽  
In The Beginning

The article aimed to determine whether the legal regulations in the field of the statutory and contractual pre-emption right of a tenant of agricultural real estate provide adequate protection to dependent owners in terms of the possibility of acquiring such land and conducting business activity on it. Secondly, the paper indicated legal problems related to statutory and contractual pre-emption right of a tenant of agricultural real estate and suggested how those problems could be handled. In the beginning, the considerations focused on the statutory pre-emption right for agricultural real estate. It referred to a subjective and objective scope of the right in question, and an attempt was made to determine whether the leased land can be sold to a third party due to the obligation to run a farm in person (only the sale contract allows for exercising the pre-emptive right). Failure to perform the indicated obligations might result in the case being referred to the court by the National Center for Agricultural Support. The second part of the article discussed the contractual pre-emption right for agricultural real estate. The author pointed out the possible concurrence of the statutory pre-emption right of the National Support Centre for Agriculture and the contractual pre-emption right of the lessee. The paper also referred to the problems related to implementing this right due to the requirements that the buyer must meet. In summary, the author, among other things, pointed out the fact that the importance of the statutory pre-emption right of the tenant of agricultural real estate had been diminishing over the years. The position of the lessee of agricultural land in terms of purchasing agricultural land is weakening. Currently, in practice, tenants may rarely use the pre-emption right. The author proposed the introduction of a provision to the Act on Shaping the Agricultural System on an additional consent of the National Support Centre for Agriculture for the sale of real estate under a lease.

Pharmacognostical Investigation of Trapa natans L Leaves

2021 ◽  
pp. 4680-4684
Author(s):  
Chandana Majee ◽  
Rupa Mazumder ◽  
Alka N. Choudhary
Keyword(s):  
Aquatic Plant ◽  
Single Layer ◽  
Total Phenolic ◽  
Phytochemical Analysis ◽  
Trapa Natans ◽  
Microscopic Evaluation ◽  
Anomocytic Stomata ◽  
Physicochemical Evaluation ◽  
The Right ◽  
Who Guideline

Background: Trapa natans L., is annual aquatic plant generally kwon as Water caltrp, Water chest nut belonging to the Trapaceae or Lytraceae family. Trapa natans L is use for the treatment of wide no of diseases without proper standardization. Objective: To give the right pharmacognostical and photochemical information of the Trapanatan L leaves. In this study pharmacognostical investigation of the fresh leaves and powder drug were done to determine the macroscopical, microscopical, quantitative physicochemical and phytochemical property of the drugs. Method: Macroscopical, quantitative and qualitative microscopy, physicochemical evaluation, extractive value, florescence analysis and phytochemical analysis were done according to the WHO guideline. Result: Macroscopical analysis showed that, leaves are greenish to purplish color, rhomboidal shape; alternate, acute, margin is dentate, pinnate venation. Microscopic evaluation showed that leaf is dorsi ventral in nature, upper layer epidermis cells were covered with cuticle layer. Single layer of barrel shape cell were present bellow the upper epidermis layer. Trichomes are generally multicellular. Anomocytic stomata were observed in upper epidermis. From the experiment it was found that methanolic extract give the highest extractive value. Phytochemical analysis gives the evidence for the presence of carbohydrate, alkaloids, glycoside, steroids, flavonoids, tannin, and triterpenoids. Qualitative phytochemical analysis give the evidence for presence of high amount total phenolic content. Conclusion: Different pharmacognostical parameters assessed in this examination help to detection and standardization of Trapa natans L., leaves.

Denmark: experience of market turnover of agricultural land

Ekonomika APK ◽  
2021 ◽  
Vol 317 (3) ◽  
pp. 89-96
Author(s):  
Ihor Yurchenko
Keyword(s):  
Structural Model ◽  
Agricultural Land ◽  
Legal Framework ◽  
Empirical Method ◽  
Practical Significance ◽  
Agricultural Lands ◽  
Logical Scheme ◽  
Logical Method ◽  
Danish Experience ◽  
The Right

The purpose of the article is to reveal the experience of the functioning of the market circulation of agricultural land in Denmark, in order to further implement in Ukrainian practice, the positive and avoid negative aspects of this experience. Research methods. The study used an empirical method (comprehensive assessment of the modern model of market turnover of agricultural land in Denmark); generalization and systematization (construction of the concept and logical-structural model of economic turnover of lands); abstract-logical method (theoretical generalizations and formulation of conclusions). Research results. It was found that the tightly regulated market turnover of agricultural land in Denmark was changed to a more liberal one, with permission to buy land for foreigners, but this not only did not attract investment as expected, but on the contrary, led to even more negative and crisis phenomena in country. The main tools, mechanisms and conditions of land turnover in agriculture of this country are determined. Scientific novelty. The main purpose of regulating the market turnover of land in Danish agriculture has been established. The legal framework of Denmark for regulating the market circulation of agricultural land has been studied. The structural and logical scheme of market circulation of agricultural lands is formed. The provisions on the Ukrainian model of regulating the market turnover of agricultural lands were further developed, taking into account the experience of the studied country. Practical significance. The results of the study of the experience of the Kingdom of Denmark on the market turnover of land, in terms of granting non-residents access to the right to purchase agricultural land, is a clear practical answer and a caveat that should undoubtedly be taken into account in Ukraine. The application of the Danish experience should help to build an effective model of market turnover of agricultural land in our country. Tabl.: 1. Figs.: 1. Refs.: 18.

scholarly journals Upgrading Slum Area, Development and Hidden Inequality (Case Study: Kampung Warna-Warni and Kampung Tridi)

2020 ◽  
Vol 18 (2) ◽  
pp. 70-79
Author(s):  
Faqih Alfian ◽  
◽  
Taufik Akbar ◽  
Keyword(s):  
Residential Area ◽  
Living Environment ◽  
Urban Life ◽  
Slum Area ◽  
Equal Rights ◽  
Residential Areas ◽  
State Recognition ◽  
Qualitative Descriptive ◽  
The Right ◽  
Slum Areas

The existence of injustice and inequality in access to the development results of the city. Slum areas have become one of the problems that exist in urban life. This automatically occurs as a result of a normal process called urbanization and development. Where many residents end up occupying non-residential areas due to their limited access. Seeing from the perspective of the access theory, how people live in the area is a form of their right to be able to utilize natural resources. One of these uses is used as a place to live. This study used a qualitative descriptive method, by taking several samples as a source of interviews. The arrangement of the slum area is now moving to another dimension, which is no longer forced evictions, but how to organize and change the residential area to be habitable. There are several indicators used in seeing a residential area that is said to be unfit for habitation. Upgrading slum areas have been able to change areas that were previously unfit to be better and able to meet indicators of the feasibility of residential areas in general. This step is also how the community continues to strive to gain access to the area. Kampung Jodipan and Kampung Tridi have changed their appearance, and have improved the quality of their living environment, with tidier, cleaner, and more affordable access to public services. Apart from the results of this research, there are still some problems, one of which is the uncertainty of land rights, so that they will not know the future of the area they live in now. The guarantee of land ownership is important to fight for equal rights to state services, state recognition, and the right to live in the area.

scholarly journals PENGELOLAAN PENDIDIKAN LINGKUNGAN BERBASIS PESANTREN

2018 ◽  
Vol 19 (1) ◽  
pp. 73-88
Author(s):  
Rihlah Nur Aulia ◽  
Izzatul Mardhiah ◽  
Dian Bagus ◽  
Ade Gunawan ◽  
Dian Elvira Nanda Sari
Keyword(s):  
Environmental Management ◽  
Agricultural Land ◽  
Boarding School ◽  
Environmental Damage ◽  
Residential Areas ◽  
Know How ◽  
The Past ◽  
Industrial Plantation ◽  
Field Notes ◽  
Rapid Pace

This research is backgrounded by some environmental problems which increasingly worries day plus the problem of management of natural resources that are not friendly and tend to be greedy. The rapid pace of development and population growth in the past decade has led to the conversion of forest and agricultural land into industrial, plantation and residential areas, resulting in degradation of uncontrolled environmental damage and pollution. The main purpose of this research is to know how environmental management conducted by Pondok Pesantren SPMAA Lamongan, East Java. In addition, the purpose of this study to find out how the implementation of environmental management conducted by the boarding school as a mirror of concern for the surrounding environment. This research uses qualitative approach. This means that the data collected is not a number, but the data comes from interviews, personal documents, memo notes, field notes, and other official documents. So that the purpose of this study is to describe the empiric reality behind the phenomenon in depth, detailed, and thorough. This research concludes that every pesantren has its own characteristic in running the concept of ekopesantren that exist, and in this pesantrenen pesantren SPMAA ekopesantren understood as pesantren that can coexist with nature and full of lesson will utilize resources wisely and wisely. Although this boarding school has not fully implemented ekopesantren. This is seen from ecopesantren indicator that has been fulfilled and that has not been fulfilled.      

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