cover
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
Waste Technology
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Education,
Arjuna Subject : -
Articles 97 Documents
Biogas production from bioethanol waste: the effect of pH and urea addition to biogas production rate Budiyono Budiyono; Iqbal Syaichurrozi; Siswo Sumardiono
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (463.532 KB) | DOI: 10.14710/1.1.1-5

Abstract

Anaerobic treatment is a good choice to treat bioethanol waste due to the high concentration of COD content for producing biogas as renewable energy. The purposes of this study were to study the effect of addition nitrogen source and pH control to biogas production. The laboratory scale-anaerobic digestions used in this experiment were operated in batch system and at room temperature. In determination of optimum pH, bioethanol waste and rumen fluid fed into digesters with initial pH 6.0; 7.0 and 8.0. Influent COD : N ratio (in form of urea) used in this study was 700:7 in compare to control.  The results showed that initial pH 7.0 produced the most biogas with total biogas 3.81 mL/g COD. While initial pH 6 and pH 8 had total biogas 3.25 mL/g COD and 3.49 mL/g COD respectively. At urea addition, biogas formed had 52.47% greater than that of at without urea addition (control variable). Controlled pH caused biogas was produced until 90-day investigation and might continue to be produced. Total biogas of control variable (without urea addition) and variable with ratio COD:N=700:7 influent were 11.07 mL/g COD and 11.41 mL/g COD respectively.Doi: http://dx.doi.org/10.12777/wastech.1.1.1-5Citation:  Budiyono, Syaichurrozi, I.  and Sumardiono, S. 2013. Biogas production from bioethanol waste: the effect of pH andurea addition to biogas production rate. Waste Technology 1(1):1-5. Doi: http://dx.doi.org/10.12777/wastech.1.1.1-5
Biodiesel Production from Microalgae by Extraction – Transesterification Method Nguyen Thi Phuong Thao; Nguyen Thanh Tin; Bui Xuan Thanh
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.488 KB) | DOI: 10.14710/1.1.6-9

Abstract

The environmental impact of using petroleum fuels has led to a quest to find a suitable alternative fuel source. In this study, microalgae were explored as a highly potential feedstock to produce biodiesel fuel. Firstly, algal oil is extracted from algal biomass by using organic solvents (n–hexan).  Lipid is contained in microalgae up to 60% of their weight. Then, Biodiesel is created through a chemical reaction known as transesterification between algal oil and alcohol (methanol) with strong acid (such as H2SO4) as the catalyst. The extraction – transesterification method resulted in a high biodiesel yield (10 % of algal biomass) and high FAMEs content (5.2 % of algal biomass). Biodiesel production from microalgae was studied through experimental investigation of transesterification conditions such as reaction time, methanol to oil ration and catalyst dosage which are deemed to have main impact on reaction conversion efficiency. All the parameters which were characterized for purified biodiesel such as free glycerin, total glycerin, flash point, sulfur content were analyzed according to ASTM standardDoi: http://dx.doi.org/10.12777/wastech.1.1.6-9Citation:  Thao, N.T.P., Tin, N.T., and Thanh, B.X. 2013. Biodiesel Production from Microalgae by Extraction – Transesterification Method. Waste Technology 1(1):6-9. Doi: http://dx.doi.org/10.12777/wastech.1.1.6-9
Assessment of potential greenhouse gas mitigation of available household solid waste treatment technologies Hoang Minh Giang; guyen Duc Luong; Luong Thi Mai Huong
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (690.933 KB) | DOI: 10.14710/1.1.10-16

Abstract

Current household solid waste treatment practices in most cities in Vietnam caused a great amount of direct greenhouse gas (GHG) emissions. Available solid waste treatment technologies should be seriously taken  into consideration as a wedge of GHG mitigation in waste sector base on presently Vietnamese economic conditions. This study aim to evaluate the potential amount of GHG mitigation from current domestic solid waste treatment technologies in Vietnam including landfills and composting from various management scenarios. In oder to use Tier 2 model of IPCC 2006 for GHG estimation from landfills, an analysis on current household solid waste management system of the city was obtained by using material flow analysis approach. A case study in Hanoi, the capital city of Vietnam was carried out in this research. As a result, there was a reduced of over 70% of the amount of CH4 emissions and  up to 53% of total GHG saving (CO2-eq) from avoiding organic waste to landfill. In addition, applying an energy recovery from LFG system to available landfills would lead to aproximately 75% of GHG saved compare to current emission of waste sector.Doi: http://dx.doi.org/10.12777/wastech.1.1.10-16Citation: Giang, H.M.,Luong, N.D., and Huong, L.T.M.2013. Assessment of potential greenhouse gas mitigation of available household solid waste treatment technologies. . Waste Technology 1(1):6-9. Doi: http://dx.doi.org/10.12777/wastech.1.1.10-16
Challenges for municipal solid waste management practices in Vietnam Nguyen Duc Luong; Hoang Minh Giang; Bui Xuan Thanh; Nguyen The Hung
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (214.361 KB) | DOI: 10.14710/1.1.17-21

Abstract

Municipal solid waste (MSW) management is currently one of the major environmental problems facing by Vietnam. Improper management of MSW has caused adverse impacts on the environment, community health, and social-economic development. This study attempts to provide a review of the generation and characterization, disposal and treatment technologies of MSW to evaluate the current status and identify the problems of MSW management practices in Vietnam. Finally, this study is concluded with fruitful recommendations which may be useful in encouraging the responsible agencies to work towards the further improvement of the existing MSW management system.Doi: http://dx.doi.org/10.12777/wastech.1.1.17-21Citation:  Luong, N.D., Giang, H.M., Thanh, B.X. and Hung, N.T.  2013. Challenges for municipal solid waste management practices in Vietnam. Waste Technology 1(1):6-9.Doi: http://dx.doi.org/10.12777/wastech.1.1.17-21
Observation of temperature and pH during biogas production from water hyacinth and cow manure Nurfitri Astuti; Tri Retnaningsih Soeprobowati; B Budiyono
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (252.884 KB) | DOI: 10.14710/1.1.22-25

Abstract

Biogas is generated from biological process of organic material by bacterial engaged. Biogas can be derived from manure, municipal waste, agricultural waste and other biomass resources. In addition to the use of cow manure as raw material for biogas production, it can also be derived from biomass containing cellulose which one is water hyacinth as an organic material that contains quite large cellulose. The abundance of water hyacinth found in Rawapening causing several negative impacts. The purpose of this study is to observe  temperature and pH on the biogas production generated from water hyacinth of Rawapening and cow manure. Biogas production process begins by chopping the leaves and stems of water hyacinth, and then mixed with cow manure and water. The results of substrate variation of water hyacinth, cow manure and water reaches optimally at 40:80:480 respectively, which produce the highest point of  biogas amounted 176.33 ml on the day 20 in 1L sized digester, the temperature of the biogas production is at 32°C.  At the initial fermentation, digester temperature of 30°C has increased over the course of the fermentation process, a peak at day 20 and then decreased to 27°C at the end of fermentation. There is a decrease in pH starting from initial fermentation at pH 6-7 and then the pH began to decline until the end of fermentation as amount of pH 5.Doi: http://dx.doi.org/10.12777/wastech.1.1.22-25Citation:  Nurfitri Astuti, N., Tri Retnaningsih Soeprobowati, T.R., and  Budiyono. 2013. Observation of temperature and pH during biogas production from water hyacinth and cow manure. Waste Technology 1(1):1-5. Doi: http://dx.doi.org/10.12777/wastech.1.1.22-25
Editorial (aim and scope, editorial board) wastech editor
Waste Technology Vol 1, No 1 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (62.149 KB) | DOI: 10.14710/1.1.i-iii

Abstract

editorial
Program Analysis and Implementation of Rice Organic Farming System in Semarang Regency Dwi Erlina Estuningtyas; Muniffatul Izzati; Hartuti Purnaweni
Waste Technology Vol 1, No 2 (2013)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1322.655 KB) | DOI: 10.14710/1.2.1-5

Abstract

The Republic of Indonesia Government through the Ministry of Agriculture has launched a program of “Go to Organic 2010” in order to accelerate the development of organic agriculture in some regions of Indonesia. This research aims to study the implementation of organic rice farming systems in District of Susukan, Semarang Regency. Specifically, the objectives of this study were (1) to analyze the program implementation of organic rice farming in the district of Susukan Semarang Regency, and (2) to evaluate the implementation of organic rice farming systems in terms of organic farming standards. The experiment was conducted in the Susukan District of Semarang Regency ranging from April to August 2013. Primary data were obtained from direct observations in the field using a questionnaire at predetermined sample area. Variables observed include correspondence between the implementation of organic rice farming in the community with organic farming criteria. The results showed that the farmers have implemented Organic Rice Farming Systems (ORFS) with a percentage of 83.3 percent and Conventional Farming Systems (CFS) 16.7 percent. The government has had a policy of organic rice farming, among others in the form of socialization in the development of organic rice farming and technical guidance in the development of organic rice farming. In general, community in the Susukan District of Semarang Regency has known environmentally farming of organic rice farming. In the rice farming community has grown organically and still need to be developed. Basically organic paddy cultivation in the district of Susukan District of Semarang Regency actually can not be said to be fully as organic rice farming, or more accurately called as semi-organic farming systems.
Fly Ash Slurry Transportation: Indian Scenario Md Aquil Ahmad; Zeeshan Ali; Md Emamul Haque
Waste Technology Vol 2, No 1 (2014)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (356.181 KB) | DOI: 10.14710/2.1.1-7

Abstract

Fly ash produced in pulverized form are menace to transport due to its powder form. Converting it to slurry form as the physical state change makes it technically viable to move from one place to other convenience to transport. In this paper we envisage the contemporary scenario of transportation of flyash including special focus on trouble related to flyash transportation whether to use in backfilling of mines or open area disposal the transport of these fine particle ash is an issue. Further suggestions and improvement for working of fly ash
EFFLUENT TREATMENT OF PHARMACEUTICAL INDUSTRY BY USING SUBSURFACE FLOW WETLAND SYSTEM Mega Anggraeni; Henna Rya Sunoko; Hadiyanto Hadiyanto
Waste Technology Vol 2, No 1 (2014)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (366.897 KB) | DOI: 10.14710/2.1.8-12

Abstract

Constructed wetland is one of the alternatives to increase water quality before it flowed into waterways. Sub Surface Flow Wetland System is one type of the constructed wetland for waste water treatment which is using symbiotic relation between water plants and microorganism around rooting system (rhizosphere) in media. Cyperus alternifolius and Canna indica, L. as well as gravel and sand media are plants and medias that can be used in constructed wetland. This research aimed to analyze the effectiveness of plant species between Cyperus alternifolius and Canna indica, L. as well as the effectiveness of gravel and sand media to decrease nitrite, ammoniak, BOD, and COD concentrations. Four reactors SSF-Wetlands with dimension of 120 cm x 30 cm x 50 cm were used in this research. The study was conducted over 12 days following the  acclimatization of plants for 7 days. Data analysis were performed by comparing the degradation coefficient (k) of BOD, COD, nitrite, and ammonia concentrations with retention time of the effluent. The results showed that  the degradation rate for the reactor with with gravel media and Cyperus alternifolius for nitrite variable was 0.60,  ammonia 0.49, BOD 0.45, and COD 0.36. Cyperus alternifolius have a higher effectiveness in reducing the concentration of nitrite, ammonia , BOD and COD than Canna indica , L. Reactors with gravel media have higher effectiveness in reducing BOD , COD , ammonia and nitrite concentration than sand media. Keywords : Canna indica. L. , Cyperus alternifolius, SSF - Wetland, , WWTP effluent of pharmaceutical industry
Phycoremediation of waste water from a plastic manufacturing industry with Chlorella pyrenoidosa H.Chick in laboratory study Kenanga Sari; Tri Retnaningsih Soeprobowati; Riche Hariyati
Waste Technology Vol 2, No 1 (2014)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2023.406 KB) | DOI: 10.14710/2.1.13-16

Abstract

Abstrack - The plastic industries has increased by 7-8% per year, it will cause a negative impact for the environment. The wastewater of plastic industrial contain many pollutants such as hazardous substances bensen, formaldehyde and heavy metals (Cd, Cu, Cr and Pb). Heavy metals Cu is the most dangerous heavy metals since Cu can inhibit enzyme systems, remediation are needed to reduce the pollutants in the environment. One effective way is by using Chlorella pyrenoidosa H.Chick as phycoremediation agent. This study aims to assess the percentage of population growth and decline of heavy metals Cu after inoculation with C. pyrenoidosa H.Chick. The method used is to cultivate C. pyrenoidosa H.Chick in plastic wastewater for 8 days and observed a decrease of percentage heavy metal Cu and population growh of C.pyrenoidosa H.Chick. Environmental factors such as temperature, salinity, pH, light intensity is maintained in order to remain stable. The data obtained with T test. After 8 days of the study turned out that C. pyrenoidosa H.Chick able to reduce Cu of 0.435 mg / l to 0.24 mg / l within 8 days and decrease percentage is 44.83%, thus meeting the criteria of the quality standard of waste according to the PP. 82 of 2001 in the amount of 0.2 ppm and safe for environment. Keywords: Chlorella pyrenoidosa, phycoremediation, water, plastic, copper.

Page 1 of 10 | Total Record : 97