Publications by authors named "Run-dong Li"
[Net ecosystem carbon exchange and its affecting factors in a deciduous broad-leaved forest in Songshan, Beijing, China].
Ying Yong Sheng Tai Xue Bao
November 2020
Article Synopsis
- Forests are crucial for carbon cycling, but the carbon balance in temperate deciduous forests is not well understood.
- In a study conducted in a deciduous broad-leaved forest in Beijing, researchers measured net ecosystem exchange (NEE) and various environmental factors throughout 2019.
- The findings revealed that NEE showed a distinct "U" shape pattern throughout the day and different seasonal behaviors, indicating that the forest acts as a carbon sink during the day and a source at night, with various environmental factors influencing these dynamics.
Article Synopsis
- * Results indicated that smaller particle sizes (< 1 μm) have higher concentrations of leached heavy metals, particularly Zn and Cu, compared to larger sizes.
- * The research concluded that fly ash particles less than 10 μm are more toxic, and the leaching methods using TCLP and sulfuric/nitric acid were found to be more effective than European standards for assessing leaching.
Article Synopsis
- * Phosphate tailings can help immobilize these heavy metals during composting, making the compost safer for land reclamation, especially in abandoned mining areas.
- * The study found that adding phosphate tailings significantly reduces the leaching potential of harmful metals in the compost, enhancing the stability of these contaminants.
[Effects of ultrasonic pretreatment on drying characteristics of sewage sludge].
Huan Jing Ke Xue
November 2009
Article Synopsis
- The high water content in sewage sludge creates challenges for its treatment and disposal, prompting research into more efficient drying methods.* -
- Ultrasonic treatment shows promise in enhancing sludge drying by accelerating water evaporation and improving drying efficiency, particularly when adjusting parameters like power and temperature.* -
- Results suggest that using ultrasound for a short duration (like 3 minutes) at lower temperatures can yield superior drying characteristics, making this method a cost-effective solution for sludge management.*
An experimental work was carried out to investigate the effect of additives (clay and coal fly ash) and washing-pretreatment on the stabilization of critical heavy metals (Cd, Cu, Zn, Pb, Cr, Ni) during a sintering process of municipal solid waste incinerator (MSWI) fly ash. The proportions of the three constituents were varied to adjust the mixture compositions. The washing time were 8 h, 16 h and 24 h.
View Article and Find Full Text PDFA laboratory procedure is described for measuring methane potentials of source-separated bio-organic municipal waste (BMW). Triplicate reactors with about 20 grams fresh material were incubated at 37 degrees C with 300 mL inoculum from Shenyang wastewater treatment plant and the methane production was followed over a 50 d period by regular measurement of methane on a gas chromatograph. At 37 degrees C, the methane production efficiency of source-separated BMW and individual waste materials was: starch > BMW > protein > food oil > fat > paper.
View Article and Find Full Text PDF[PAHs of source separation household organic waste and composting production].
Huan Jing Ke Xue
March 2008
Composing treatments of source separation (SS) household bio-organic waste and straw mixed in 10:1, 16 kinds of PAHs in source separation household bio-organic waste and compost production were determined by gas chromatograph/mass spectrograph (GC-MS) according to U.S.EPA 8270 standard method.
View Article and Find Full Text PDFThe characteristics of heavy metals (Cd, Pb, Zn, Cu, Cr and Ni) were studied during pilot melting process of waste incineration fly ash, and it mainly focused on the solidification of those heavy metals in molten slag. The experiment factors include temperature (1290 degrees C, 1320 degrees C and 1360 degrees C), additive (10% glass powder), slag cooling mode(water or air cooling), whose influence on the heavy metals' solidification in the molten slag was studied. The result shows: the solidification of the heavy metals (Pb, Zn, Cu, Cr and Ni) increase on certain degree with temperature's increasing; Adding 10% glass powder makes the solidification of heavy metals increase greatly except Zn; For Zn, Cu, Cr and Ni, the solidification using air cooling mode is higher than that using water cooling mode.
View Article and Find Full Text PDFThe sintering process is used to stabilize the heavy metal in fly ash from municipal solid waste incinerator (MSWI). Migration characteristics of 6 targeted heavy metals (Cd, Pb, Cu, Ni, Cr and Zn) in the sintering process of MSWI fly ash were investigated by experiments. Effect of several factors including sintering temperature, residence time, molding pressure and particle diameter on the migration of heavy metals were discussed in details.
View Article and Find Full Text PDFArticle Synopsis
- * Chromium, lead, and zinc levels in the slag increase with the addition of LC at 1400 degrees C, while cadmium and copper levels decrease, indicating varying effects on different metals.
- * Melting for a shorter time (under 33 minutes) is effective for ensuring high binding efficiency of heavy metals, and the impact of the LC additive varies significantly among different types of heavy metals during the melting process.
Article Synopsis
- The study examined how different additives, specifically CaO and liquid ceramic (LC), affect the breakdown of harmful dioxins found in municipal solid waste incinerator (MSWI) fly ash during a melting process.
- Results showed that the decomposition efficiency of dioxins changed based on the atmospheric conditions; CaO improved dioxin removal in oxidative settings but worsened it in inert ones.
- The addition of liquid ceramic significantly enhanced dioxin decomposition, achieving a complete removal at lower temperatures (from 1460°C to 1100°C) when 10% LC was used.