Effect of Co-Composting of Kitchen Waste and Agricultural Waste on H2S and NH3 Emission

2013 ◽  
Vol 448-453 ◽  
pp. 741-745
Author(s):  
Hong Yu Zhang ◽  
Guo Xue Li ◽  
Jin Bing Yang ◽  
Qing Yuan Yang
Keyword(s):  
High Temperature ◽  
Oxygen Content ◽  
Organic Waste ◽  
Agricultural Waste ◽  
Nutrient Content ◽  
Agricultural Wastes ◽  
Kitchen Waste ◽  
Odor Pollution ◽  
High Temperature Stage

NH3 and H2S emissions not only reduced the nutrient content of compost, and caused odor pollution during organic waste composting. In this study, composting kitchen waste, agricultural waste and co-composting kitchen waste and agricultural waste were conducted. The temperature, oxygen content and the typical odors emission were analyzed in all treatments. The results indicated that Co-composting kitchen waste and agricultural wastes significantly improve the pile temperature and shorten the mesophilic stage. Poor O2 transfer and pile temperature were the main reason for H2S production during waste composting. H2S release occurred mainly within 15 days in this study for all treatments. The highest concentration of H2S was observed in the treatment of T2. The productions of H2S were reduced by 24.8%, 42.3% and 55.1% for T1, T3 and T4 that compared to T2, respectively. The NH3 had a similar trend to that of H2S. About 66.4%-72.0% of the total NH3 released in the high temperature stage for all treatments. The highest concentration of NH3 was observed in the treatment of T4.The productions of NH3 were reduced by 36.5%, 19.8% and 21.3% for T1, T2 and T3 that compared to T4, respectively. In terms of H2S control, it is suitable to co-composting of kitchen waste and agricultural waste. In terms of NH3 control, it is better to compost kitchen waste and agricultural waste independently.

Removal of nutrients from Organic Liquid Agricultural Waste using filamentous algae.

2020 ◽  
Author(s):  
Gonzalo Flores-Morales ◽  
Mónica Díaz ◽  
Patricia Arancibia-Avila ◽  
Michelle Muñoz-Carrasco ◽  
Pamela Jara-Zapata ◽  
...  
Keyword(s):  
Organic Waste ◽  
Low Cost ◽  
Organic Liquid ◽  
Agricultural Waste ◽  
Filamentous Algae ◽  
Tertiary Treatment ◽  
Nutrient Reduction ◽  
Algae Removal ◽  
Algae Growth ◽  
Waste Effluents

Abstract A feasibility analysis of tertiary treatment for Organic Liquid Agricultural Waste is presented using filamentous algae belonging to the genus Cladophora sp. as an alternative to chemical tertiary treatment. The main advantages of tertiary treatments that use biological systems are the low cost investment and the minimal dependence on environmental variables. In this work we demonstrate that filamentous algae reduces the nutrient load of nitrate (circa 75%) and phosphate (circa 86%) from the organic waste effluents coming from dairy farms after nine days of culture, with the added advantage being that after the treatment period, algae removal can be achieved by simple procedures. Currently, the organic wastewater is discarded into fields and local streams. However, the algae can acquire value as a by-product since it has various uses as compost, cellulose, and biogas. A disadvantage of this system is that clean water must be used to achieve enough water transparency to allow algae growth. Even so, the nutrient reduction system of the organic effluents proposed is friendly to the ecosystem, compared to tertiary treatments that use chemicals to precipitate and collect nutrients such as nitrates and phosphates.

PROSPECTS FOR OBTAINING GAS MOTOR FUEL FROM BIOGAS OF ANAEROBIC DIGESTION OF AGRICULTURAL WASTE

2021 ◽  
Vol 3 (144) ◽  
pp. 22-31
Author(s):  
Viktor S. Grigor’yev ◽  
◽  
Il’ya V. Romanov
Keyword(s):  
Anaerobic Digestion ◽  
Gas Hydrates ◽  
Process Model ◽  
Organic Waste ◽  
Agricultural Waste ◽  
Motor Fuel ◽  
Hydrate Formation ◽  
Research Purpose ◽  
Industrial Complex ◽  
Mixed Gas

The ability of gas hydrates to concentrate gas into a solid chelate structure and the properties of self-preservation of gas hydrates at negative temperatures allows us to consider the possibility of developing a method for the utilization of biogas, environmentally safe storage and transportation of biomethane. (Research purpose) The research purpose is in substantiation the technological possibilities of obtaining synthetic mixed gas hydrates of biogas components, their storage and transportation based on the analysis of the existing regularities of the formation of gas hydrates in time, temperature and external pressure. (Materials and methods) The article presents the accumulated results of studies of the process of obtaining artificial hydrates of natural gas and methane- containing gas mixtures at various initial static pressures and temperatures. The object of research to substantiate the parameters of artificial creation of gas hydrates is biogas obtained during anaerobic thermophilic fermentation of organic waste at an existing experimental biogas plant. Mixed feed SK-8 with a humidity of 90-92 percent was used as an organic substrate of constant composition. The composition of biogas was studied using the Optima-7 Biogas gas analyzer. (Results and discussion) The article presents a process model and a technical appearance of an installation for producing gas motor fuel from the biogas of anaerobic digestion of organic waste of the agro-industrial complex. The hydrate formation time depends on the increase in the interfacial surface and the movement of gas bubbles relative to the liquid, which can be regulated by acting on the hydrate formation zone (shock wave, electromagnetic, mechanical, chemical, temperature). (Conclusions) The research results can be used in modeling processes in two-phase media during the formation of gas hydrates and the creation of installations for their production.

Effects of ultra-high-temperature (UHT) processing and of subsequent storage on the vitamin content of milk

1969 ◽  
Vol 36 (3) ◽  
pp. 447-454 ◽  
Author(s):  
J. E. Ford ◽  
J. W. G. Porter ◽  
S. Y. Thompson ◽  
Joyce Toothill ◽  
J. Edwards-Webb
Keyword(s):  
Ascorbic Acid ◽  
Folic Acid ◽  
High Temperature ◽  
Oxygen Content ◽  
Raw Milk ◽  
Vitamin B ◽  
Vitamin Content ◽  
Residual Oxygen ◽  
Subsequent Storage ◽  
Ultra High Temperature

SummaryThe vitamin content of ultra-high-temperature (UHT) processed milk was compared with that of the original raw milk. Three processes were used. In the first, which caused no change in oxygen content, the milk was heated and cooled in a plate-type heat exchanger. In the second, the milk was again heated indirectly and then evaporatively cooled, leaving in the milk about one-third of the initial oxygen content. In the third process the milk was heated by direct steam injection and cooled by evaporation and contained little or no residual oxygen.On processing and during subsequent storage for 90 days there was no loss of vitamin A, carotene, vitamin E, thiamine, riboflavine, pantothenic acid, biotin or nicotinic acid. There was little or no loss of vitamin B6or vitamin B12on processing, but up to 50% of each of these vitamins was lost during 90 days' storage. All the dehydroascorbic acid (DHA) and about 20% of the ascorbic acid (AA) was lost on processing. There was no further loss of AA during 90 days’ storage when no residual oxygen was present, but in milks containing more than about 1 ppm oxygen all the AA was lost within 14 days. About 20% of the folic acid was lost on processing; thereafter, as with ascorbic acid, the extent of the loss on storage depended on the residual oxygen content of the milk: in the absence of oxygen the folic acid was stable.

scholarly journals Sustainable Management of Organic Wastes in Sharjah, UAE through Co-Composting

2020 ◽  
Vol 3 (4) ◽  
pp. 76
Author(s):  
Md Maruf Mortula ◽  
Aqeel Ahmed ◽  
Kazi Parvez Fattah ◽  
Ghina Zannerni ◽  
Syed A. Shah ◽  
...  
Keyword(s):  
United Arab Emirates ◽  
Sustainable Management ◽  
Organic Waste ◽  
C:N Ratio ◽  
Nutrient Content ◽  
Organic Wastes ◽  
Long Run ◽  
Green Areas ◽  
High Nutrient ◽  
Minimal Treatment

Daily human activities and vast green areas produce substantial amounts of organic wastes that end up in landfills with minimal treatment. In addition to the problems associated with landfills, disposal through this method is unsustainable in the long run and does not allow recovering materials from the waste. This paper focuses on the co-composting of different organic wastes produced in The Emirate of Sharjah, United Arab Emirates (UAE), to optimize mixing proportions of three different kinds of wastes—sewage sludge (SS), green waste (GW), and food waste (FW). All three organic wastes were analyzed to determine their chemical composition and the mixing proportions. Ten different mixing proportions as a function of carbon:nitrogen (C:N ratios) were determined and mixed in a NatureMill composter. Compost samples were tested for pH, salinity, conductivity, moisture content, organic matter, organic carbon, phosphorus, total nitrogen, and final C:N ratio after 6 weeks. Results indicate that a period of 5–6 weeks is sufficient for the compost to stabilize. The varying mixing proportions produced a good-quality compost (C:N up to 20:1) with high nutrient content. The study reaffirms that co-composting can be a potential sustainable organic waste management option for the United Arab Emirates.

scholarly journals Comparison of Household and Communal Biogas Digester Performance to Treat Kitchen Waste, Case Study: Bandung City, Indonesia

2018 ◽  
Vol 73 ◽  
pp. 01019
Author(s):  
Elisabeth Rianawati ◽  
Enri Damanhuri ◽  
Marisa Handajani ◽  
Tri Padmi
Keyword(s):  
Organic Waste ◽  
Open Space ◽  
Biogas Production ◽  
Daily Basis ◽  
Kitchen Waste ◽  
Anaerobic Digesters ◽  
Disposal Area ◽  
Input And Output ◽  
Biogas Productivity

Bandung City is one of the big cities in Indonesia that grappled with waste problem. There is 1,500 ton of waste produced daily, of which 65% is organic. In addition, the water content of the waste could reach 80% during rainy season, given that the waste is commonly collected in open space before transported to the final disposal area. In order to tackle this issue, the municipality of Bandung has started to implement anaerobic digesters to treat kitchen waste since 2013 in an attempt to reduce organic waste. There are three scales of bio-digesters that have been implemented: city 2 ton, communal (20-1000 kg) and household scale (20 kg), which comprise of 1 unit, 15 units and 100 units respectively. This study evaluate the efficiency and biogas productivity of each bio-digesters type. We analyzed 30 unit and 14 unit of household and communal biodigesters respectively. The waste input, slurry output and biogas production were estimated based on average of daily basis. Both the input and output of the biodigesters were characterized (TS, VS, COD) to gain further understanding. This study provide facts and figures to improve the further implementation of household bio-digesters in Bandung City.

INVESTIGATION ON CHARACTERISTICS OF POME BLENDED DIESEL ENGINE

2015 ◽  
Vol 75 (8) ◽  
Author(s):  
Helmisyah Ahmad Jalaludin ◽  
Mohd Ruysdi Ramliy ◽  
Nik Rosli Abdullah ◽  
Salmiah Kasolang ◽  
Shahrir Abdullah ◽  
...  
Keyword(s):  
High Temperature ◽  
Combustion Chamber ◽  
Fuel Consumption ◽  
Oxygen Content ◽  
Diesel Fuel ◽  
Alternative Fuels ◽  
Sudden Increase ◽  
Compression Ignition ◽  
Compression Ignition Engine ◽  
Complete Combustion

The sudden increase in fuel prices due to diminishing petroleum resources and the pollution resulting from its use has resulted in research into alternative fuels such as biodiesel. In addition, the faster combustion and high temperature in the combustion chamber which results from petroleum diesel fuel leads to higher nitrogen oxide (NOx) and Particulate Matter (PM) emissions. Therefore, this research was conducted to investigate the effect of using palm oil methyl ester (POME) blends as alternative fuels on the performance and emission of a compression ignition engine. The performance of POME blends and diesel were compared by manipulating the load of the engine at 1800 rpm. The results obtained show that fuel consumption rate is higher for the POME blends compared to the diesel fuel and increases as the POME concentration increases. The increment of brake specific fuel consumption and the reduction of CO emission exhibit a relation to the increase in percentage of POME. This is mainly contributed by the higher oxygen content of POME which promotes complete combustion of the blends. However, efficient combustion from the blends as compared to diesel fuel resulted from higher oxygen content and cetane number leads to significant increase in exhaust temperature. This in turn increases NOx emissions since using POME blends is highly related to high temperature of combustion chamber. The experimental results proved that POME in compression ignition engine is a possible substitute to diesel.

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