scholarly journals The Effect in the Wastewater Treatment at Soybean Curd of Contact Time Modification of Artificial Wetland Using SSF by Using Schoenoplectus Corymbosus to Improve Water Quality

2018 ◽  
Vol 47 ◽  
pp. 04004 ◽  
Author(s):  
Arif Mahdiana ◽  
Asrul Sahri Siregar ◽  
C Sonny Januar ◽  
Norman Arie Prayogo
Keyword(s):  
Suspended Solids ◽  
Flow System ◽  
Negative Impact ◽  
Pollution Prevention ◽  
Surface Flow ◽  
Basic Medium ◽  
Artificial Wetlands ◽  
Soybean Curd ◽  
Wetland Construction ◽  
Research Procedure

Soybean curd industrial is rapidly growing industry. Characteristic of effluent from soybean curd industrial may contains a lot of organic materials and suspended solids that give negative impact to water. One of the soybean curd industry pollution prevention is a modification of artificial wetlands with sub surface flow system using recirculation by S. corymbosus plant to reduce the value of BOD, TSS and nitrate in soybean curd wastewater. Early of research procedure is prepare wetland construction consist of 8 part box container with a capacity of 75 L, then filled in the basic medium gravel 5 cm, clay 10 cm, and then planted a S. corymbosus by 30 pieces/construction, then drained soybean curd waste that has been diluted through the recirculation pipe for 16 days in the land of green house plant physiology. The result of optimal decline BOD occured on day 12th ie 99,7, TSS decline value optimal ie 89,3% on day 12th, and declined of optimal nitrate on day 12th ie 89,7%. The decline value of BOD, TSS and nitrate until day 16th has been standart quality unless TSS according to Perda Jateng no.5 tahun 2012 and PP no.82 tahun 2001.

Performance assessment of pilot horizontal sub-surface flow constructed wetlands for removal of diesel from wastewater by Scirpus grossus

2013 ◽  
Vol 68 (10) ◽  
pp. 2271-2278 ◽  
Author(s):  
Israa Abdulwahab Al-Baldawi ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Nurina Anuar ◽  
Fatihah Suja ◽  
Mushrifah Idris
Keyword(s):  
Constructed Wetlands ◽  
Suspended Solids ◽  
Flow System ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Surface Flow ◽  
Total Petroleum Hydrocarbon ◽  
Physical Parameters ◽  
Contaminated Water ◽  
Development Technology

One of the appropriate development technology options for the treatment of wastewater contaminated with diesel is constructed wetlands (CWs). Throughout 72 days of exposure, sampling was carried out for monitoring of physical parameters, plant growth and the efficiency of total petroleum hydrocarbon (TPH) removal, as an indication for diesel contamination, to assess the pilot-scale performance. Four pilot CWs with a horizontal sub-surface flow system were applied using the bulrush of Scirpus grossus. The CWs were loaded with different diesel concentrations of 0, 0.1, 0.2 and 0.25% (Vdiesel/Vwater). The TPH removal efficiencies were 82, 71, and 67% at the end of 72 days for diesel concentrations of 0.1, 0.2, and 0.25% respectively. In addition, the high removal efficiency of total suspended solids and chemical oxygen demand (COD) were 100 and 75.4% respectively, for a diesel concentration of 0.1%. It was concluded that S. grossus is a potential plant that can be used in a well-operated CW for restoring 0.1% diesel-contaminated water.

Effect of recirculation on organic matter removal in a hybrid constructed wetland system

2011 ◽  
Vol 63 (10) ◽  
pp. 2360-2366 ◽  
Author(s):  
S. Ç. Ayaz ◽  
N. Findik ◽  
L. Akça ◽  
N. Erdoğan ◽  
C. Kınacı
Keyword(s):  
Organic Matter ◽  
Constructed Wetland ◽  
Suspended Solids ◽  
Flow System ◽  
Pilot Scale ◽  
Surface Flow ◽  
Small Communities ◽  
Anaerobic Reactors ◽  
Wetland System ◽  
Anaerobic Pretreatment

This research project aimed to determine the technologically feasible and applicable wastewater treatment systems which will be constructed to solve environmental problems caused by small communities in Turkey. Pilot-scale treatment of a small community's wastewater was performed over a period of more than 2 years in order to show applicability of these systems. The present study involves removal of organic matter and suspended solids in serially operated horizontal (HFCW) and vertical (VFCW) sub-surface flow constructed wetlands. The pilot-scale wetland was constructed downstream of anaerobic reactors at the campus of TUBITAK-MRC. Anaerobically pretreated wastewater was introduced into this hybrid two-stage sub-surface flow wetland system (TSCW). Wastewater was first introduced into the horizontal sub-surface flow system and then the vertical flow system before being discharged. Recirculation of the effluent was tested in the system. When the recirculation ratio was 100%, average removal efficiencies for TSCW were 91 ± 4% for COD, 83 ± 10% for BOD and 96 ± 3% for suspended solids with average effluent concentrations of 9 ± 5 mg/L COD, 6 ± 3 mg/L BOD and 1 mg/L for suspended solids. Comparing non-recirculation and recirculation periods, the lowest effluent concentrations were obtained with a 100% recirculation ratio. The effluent concentrations met the Turkish regulations for discharge limits of COD, BOD and TSS in each case. The study showed that a hybrid constructed wetland system with recirculation is a very effective method of obtaining very low effluent organic matter and suspended solids concentrations downstream of anaerobic pretreatment of domestic wastewaters in small communities.

IDENTIFYING THE MOST SUITABLE AREAS FOR SURFACE FLOW WETLAND CONSTRUCTION IN LITHUANIA

2015 ◽  
Author(s):  
Antanas DUMBRAUSKAS ◽  
Nijolė BASTIENĖ ◽  
Petras PUNYS
Keyword(s):  
Constructed Wetlands ◽  
Ecological Status ◽  
Surface Flow ◽  
Gis Analysis ◽  
Proximity Analysis ◽  
Wetland Construction ◽  
The Mean ◽  
Two Phases ◽  
Terrain Features ◽  
Surface Flow Constructed Wetlands

GIS-based approach to find the suitable sites for surface flow constructed wetlands was employed for the Lithuanian river basins with low ecological status. According to the nature of the analysed criteria the flowchart consists of two phases. Criteria used include hydrographical network, soil properties, terrain features, land use, etc. Some of them have strictly defined values (constraints), and other ranges within certain limits (factors). Limited criteria were analysed using rejection principle and influencing factors using proximity analysis and overlay methods. Selecting the potential sites using standard GIS analysis tools there was estimated about 3286 sites for possible wetlands with the mean area of inflow basin about 4 km2 in the basins of water bodies at risk.

scholarly journals The Effectiveness of Organic Pollutants Removal in Constructed Wetland with Horizontal Sub-Surface Flow / Efektywność Usuwania Zanieczyszczeń Organicznych W Oczyszczalni Hydrofitowej

2015 ◽  
Vol 16 (1) ◽  
pp. 69-82 ◽  
Author(s):  
Anita Jakubaszek ◽  
Zofia Sadecka
Keyword(s):  
Wastewater Treatment ◽  
Organic Pollutants ◽  
Constructed Wetland ◽  
Suspended Solids ◽  
Research Work ◽  
Vegetation Period ◽  
Surface Flow ◽  
Seasonal Temperature ◽  
Work Related ◽  
Pollutants Removal

Abstract This paper presents the results of the research work related to the removal efficiency from wastewater organic pollutants and suspended solids at HSSF (horizontal subsurface flow) constructed wetland. The average effectiveness defined as loss of value COD in wastewater has reached 77%, for BOD5 - 80% and TOC - 82%. The effect of seasonal temperature changes and the period of plant vegetation and rest on the effectiveness of wastewater treatment were also analyzed. The results of the presented research showed a decrease in the efficiency of removing organic pollutants from wastewater and suspended solids in the autumn and winter. During the vegetation the object in Małyszyn has been characterized by the effectiveness of wastewater treatment at the level of 78% for COD, 82% for BOD5, and in the non-vegetation period the effectiveness has decreased up to 75% for COD and 74% for BOD5. During the plants growth the total suspension was removed in 88%, whereas during the plants rest efficiency of removing lowered to 69%.

scholarly journals A multi-functional and multi-compartment constructed wetland to support urban waterway restoration

2018 ◽  
Vol 13 (4) ◽  
pp. 764-770 ◽  
Author(s):  
T. M. Adyel ◽  
M. R. Hipsey ◽  
C. Oldham
Keyword(s):  
Constructed Wetland ◽  
Flow System ◽  
Surface Flow ◽  
Base Flow ◽  
Low Flow ◽  
Nutrient Loads ◽  
Storm Events ◽  
Flow Conditions ◽  
Storm Flow ◽  
Diverse Area

Abstract This study assessed the significance of a multi-functional and multi-compartment constructed wetland (CW) implemented to restore a degraded urban waterway in Western Australia. The wetland was initially constructed as a surface flow system, then modified through the incorporation of the additional laterite-based subsurface flow system, with the potential for operation of a recirculation scheme and groundwater top-up during low water flows in summer. The CW performance was assessed by comparing nitrogen (N) and phosphorus (P) attenuation during base flow, high flow and episodic storm flow conditions. The performance varied from approximately 41% total nitrogen (TN) and 66% total phosphorus (TP) loads reduction during storm events, increasing up to 62% TN and 99% TP during low flow and summer recirculation periods. In overall, the CW attenuated about 45% TN and 65% TP loads from being delivered to the downstream sensitive river between 2009 and 2015. The CW design proved to be not only highly effective at reducing nutrient loads, but also improved the ecological services of the urban waterway by providing a diverse area for habitat and recreational activities.

Remediation of PAHs-contaminated water and sand by tropical plant (Eleocharis ochrostachys) through sub-surface flow system

2020 ◽  
Vol 20 ◽  
pp. 101044 ◽  
Author(s):  
Nadya Hussin AL Sbani ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Mushrifah Idris ◽  
Hassimi Abu Hasan ◽  
Israa Abdulwahab Al-Baldawi ◽  
...  
Keyword(s):  
Flow System ◽  
Surface Flow ◽  
Contaminated Water ◽  
Tropical Plant

Optimizing environmental expenditures for maximizing economic performance

2016 ◽  
Vol 54 (10) ◽  
pp. 2544-2561 ◽  
Author(s):  
Nitish Singh ◽  
Jieqiong Ma ◽  
Jie Yang
Keyword(s):  
Economic Performance ◽  
Negative Impact ◽  
Positive Impact ◽  
Raw Materials ◽  
Pollution Prevention ◽  
Global Reporting Initiative ◽  
Resource Based View ◽  
Content Type ◽  
Product Stewardship ◽  
New Perspective

Purpose Corporate environmental expenditure has been a growing concern in recent years, yet mixed findings exist regarding its economic impact. The purpose of this paper is to explain the mixed relationship between environmental expenditure and economic performance from the natural-resource-based view. Design/methodology/approach Using Global Reporting Initiative survey data from 120 firms in 30 countries, this study uses PROCESS, a path-based analysis software, to test the moderation and mediation hypotheses in an integrated analytical model. Findings The findings show that environmental expenditure has a negative impact on economic performance through pollution prevention capability. In contrast, environmental expenditure has a positive impact on economic performance through product stewardship capability. Both effects are significantly strengthened when the firm is located in an environmentally munificent country. Practical implications This study intends to inform firm managers, especially those in environmentally munificent countries, to relocate their environmental expenditure to enhance firms’ economic performance. In particular, firms should focus more on the reduction of input, such as raw materials, energy, and water, instead of output, including emissions, effluents, and wastes. Originality/value The contrasting indirect effects of pollution prevention and product stewardship offer a viable explanation for the mixed findings in the existent literature on environmental expenditure from a new perspective.

scholarly journals SnO2Nanostructure as Pollutant Gas Sensors: Synthesis, Sensing Performances, and Mechanism

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Brian Yuliarto ◽  
Gilang Gumilar ◽  
Ni Luh Wulan Septiani
Keyword(s):  
Gas Sensor ◽  
Gas Sensors ◽  
Lithium Battery ◽  
Gas Adsorption ◽  
Negative Impact ◽  
Pollution Prevention ◽  
Oxide Semiconductor ◽  
Motor Vehicles ◽  
Waste Products ◽  
Battery Electrode

A significant amount of pollutants is produced from factories and motor vehicles in the form of gas. Their negative impact on the environment is well known; therefore detection with effective gas sensors is important as part of pollution prevention efforts. Gas sensors use a metal oxide semiconductor, specifically SnO2nanostructures. This semiconductor is interesting and worthy of further investigation because of its many uses, for example, as lithium battery electrode, energy storage, catalyst, and transistor, and has potential as a gas sensor. In addition, there has to be a discussion of the use of SnO2as a pollutant gas sensor especially for waste products such as CO, CO2, SO2, and NOx. In this paper, the development of the fabrication of SnO2nanostructures synthesis will be described as it relates to the performances as pollutant gas sensors. In addition, the functionalization of SnO2as a gas sensor is extensively discussed with respect to the theory of gas adsorption, the surface features of SnO2, the band gap theory, and electron transfer.

scholarly journals EKSISTENSI MEDIA CETAK PADA MASA PANDEMI COVID-19

2020 ◽  
Vol 9 (2) ◽  
pp. 127-134
Author(s):  
Bella Dwi Syahputri Ispriadi ◽  
Devy Anggita Putri ◽  
Prahasti Ken Dewani
Keyword(s):  
Digital Media ◽  
Print Media ◽  
Negative Impact ◽  
Media Industry ◽  
Media Companies ◽  
Printed Media ◽  
Research Procedure ◽  
Qualitative Descriptive ◽  
The Media ◽  
Descriptive Approach

Abstract. This article discusses the existence of print media during the Covid-19 pandemic. Now, many printed media have lost their readership significantly. The Covid-19 pandemic has become a disruption that has a negative impact on the print media industry. People choose to switch to digital media because it is easy and the information they need is faster. Changing the media used in conveying information will certainly have an impact on the future of the media itself. When the turnover of print media decreases, the print media company will go bankrupt / close and lay off employees and cut employee salaries. The method used in this article uses a qualitative descriptive approach by using a research procedure according to the latest available facts to solve a problem regarding the existence of print media during the Covid-19 pandemic. Based on the data obtained, it is explained that from 434 print media throughout January to April 2020, 71 percent of print media companies experienced a decrease in turnover of 40 percent when compared to the same period in 2019. Based on the data above, it can be seen that a decrease in media existence print during the COVID-19 pandemic. This decline certainly had an impact on the business turnover of advertisers, which resulted in a decrease in advertising budgets on various media platforms.Keywords: Covid-19, Existence, Print Media, PandemicAbstrak. Artikel ini membahas tentang eksistensi media cetak pada masa pandemi Covid-19. Saat ini, amat banyak media cetak yang kehilangan para pembacanya secara signifikan. Pandemi Covid-19 ini sudah menjadi disrupsi yang berdampak negatif bagi para industri media cetak. Masyarakat memilih beralih ke media digital karena mudah dan informasi yang dubutuhkan lebih cepat. Berubahnya media yang digunakan dalam penyampaian infromasi tentu akan memberikan dampak pada masa depan dari media itu sendiri. Ketika omzet media cetak turun maka perusahaan media cetak akan mengalami bangkrut/tutup serta terjadi pemecatan pegawai dan  pemotongan gaji karyawan. Metode yang digunakan dalam artikel ini dengan menggunakan pendekatan deskriptif kualitatif dengan menggunakan sesuatu tata cara riset sesuai fakta-fakta yang terdapat terbaru untuk memecahkan sesuatu permasalahan mengenai eksistensi media cetak pada masa pandemi Covid-19. Beradasarkan data yang diperoleh menjelaskan bahwa dari 434 media cetak disepanjang bulan Januari hingga bulan April 2020, terdapat 71 persen perusahaan media cetak mengalami suatu penurunan omzet dari 40 persen bila dibandingkan dengan periode yang sama pada tahun 2019. Bedasarkan data diatas maka dapat dilihat penurunan eksistensi media cetak selama pandemi covid 19. Penurunan ini tentunya berdampak pada omzet usaha dari para pengiklan mengalami penurunan yang mengakibatkan anggaran iklan pada berbagai platform mediapun menjadi semakin berkurang.Kata Kunci: Covid-19, Eksistensi,Media Cetak, Pandemi

scholarly journals Investigation of Filtration Capacity of Surface Wastewater Filters by Mathematical Modelling

2020 ◽  
Vol 27 (2) ◽  
pp. 241-255
Author(s):  
Eglė Marčiulaitienė ◽  
Laura Meškauskaitė ◽  
Natalija Pozniak ◽  
Leonidas Sakalauskas
Keyword(s):  
Heavy Metals ◽  
Suspended Solids ◽  
Negative Impact ◽  
Water Bodies ◽  
Total Carbon ◽  
Cleaning Efficiency ◽  
Carbon And Nitrogen ◽  
Car Traffic ◽  
Zinc Cadmium ◽  
Wastewater Pollutants

AbstractAs the urbanisation level increases, due to intensification of car traffic and increased areas of impermeable surfaces, pollution of surface wastewater and a negative impact on water bodies are increasing. Due to the increasing pollution of surface water bodies, the eutrophication process is taking place intensively. One of the technologies of surface wastewater treatment allowing reduction in the amounts of suspended solids (SS), heavy metals and other pollutants is surface wastewater filters. Filters with different fillers have been designed for the treatment of principal surface wastewater pollutants: suspended solids, heavy metals (zinc, cadmium, copper, lead), BOD5, total carbon and nitrogen. The Kriging method was adapted to test the efficiency of filters filled with construction waste and wood waste-derived biochar using distance matrices. The method developed makes it possible to model the characteristics of filters in relation to different fillers, using experimental results. The mathematical model is suitable for other filtrate characteristics, not only the ratio of fillers, but also the length of the filter life, its durability calculations, which allows optimizing filter cleaning efficiency up to 96.93 %.

Sign in / Sign up

Export Citation Format

Share Document