Applied Mechanics and Materials Vols. 522-524

Abstract: This paper looked back on the current situation about simulation using PHREEQC of heavy metal transport in soil and the current situation of coupling with other value simulation software. On such a base, the feasibility, advantages and problems of heavy metal reactive solute transport in soil using PHREEQC were discussed.

Abstract: The characteristics of biological nutrient removal was investigated with aerobic granular sludge in an anaerobic/aerobic SBR system. The anaerobic/aerobic SBR system showed a very stable phosphorus, nitrogen and organic carbon removal performance. The average removal rate for NH₄⁺-N, total inorganic nitrogen (TIN), PO₄^3--P and CH₃COO^--C reached 97.8%, 89.7%, 96.8% and 98.8%, respectively, when dissolved oxygen concentration in the aerobic phase was controlled at 1~2mg/L, with 80~90min anaerobic phase followed by 240min aerobic phase during the SBR cycle. The nitrification, denitrification, aerobic phosphate uptake and anoxic phosphate uptake could occur simultaneously in aerobic granular sludge under aerobic condition. The microorganism population in the granular sludge has a diversification, the formed microecosystem is more stable and the ability to withstand shock loading and the self-regulation ability are stronger.

Abstract: Hair dyeing wastewater is produced in coloring process. Its composition is complicated,in which contains a large number of organic pollutants and high color. Hair dyeing wastewater treatment can be effectively treated by Fenton oxidation method. The experiment results show that hair dyeing wastewater is treated by Fenton oxidation in this thesis. Fenton reagent is affected by hair dyeing wastewater, pH reaction time and many other factors. When raw water COD is 3800mg/L and chroma is 1210 times, by using Fenton oxidation method determine best experimental conditions: concentration of H2O2 is 24.5ml（30%H2O2), pH value is 3.0, nH2O2/nFe2+ is 7, reaction time is 60 min. Under the reaction condition , experimental results show that COD and color removal rates were 91.2% and 93.2% in hair dyeing wastewater by Fenton oxidation.

Abstract: According to development environment of Diesel vehicle in recent years, emission situation, emission characteristics and treatment technologies of black carbon in diesel vehicle exhaust gas were investigated. Through comparative analysis of existing technologies, strategies and recommendations for resolving black carbon emissions were further presented so as to control or reduce the emissions of black carbon in diesel vehicle exhaust gas.

Abstract: Using the calculation methodology based on energy consumption, the amount of carbon emissions due to energy consumption in Shaanxi province were calculated from 2000 to 2010. The decreasing trends in carbon emission were analyzed in terms of energy structure, economic growth and industry structure. The increasing of carbon oxide emission of energy consumption of Shaanxi province was mainly drove by economic increasing. The carbon emission of the Secondary industry is the biggest one in energy consumption which is 60% in the gross carbon emission, then, the Tertiary industry is 20% of the gross carbon emission.

Abstract: Water pinch technology for the water system of enterprises is one of the focuses on water-saving and emission reduction research of enterprises in recent years. This technology is characterized by the design minimal fresh water consumption and waste water emissions minimum and aims to achieve economic benefit optimum process integration technology. The application of water pinch technology to integration and optimization of the water system was reviewed, and engineering application examples of water pinch technology were introduced. The water pinch technology is simple and intuitive. Besides, it could achieve optimal solution for a single impurity system. But for multiple contaminants system, this method will no longer apply. Taking into account its limitations, the possible optimization solutions to application of water pinch technology in combination with other types of analysis tools in enterprise water system were put forward.

Abstract: The paper introduces the research status and progress of domestic and overseas researches on the effects of heavy metal ions on activated sludge microorganisms. The analysis of the research results show that the effects of heavy metals on microorganism vary with metal type, form and concentration.

Abstract: The laboratory-made dicyandiamide formaldehyde polymer is used to study the effect of the flocculation treatment of simulated wastewater of You Li Su-hong EB. And the influencing factors mainly include flocculant dosage, pH and temperature. The experimental results show that when the dicyandiamide formaldehyde flocculant dosage is 8mL / L and pH is acidic or neutral, COD and color removal rate are the highest that have reached more than 70%. Besides, temperature has little effect on the flocculation treatment, and room temperature is enough to make the treatment effect good. Finally compared with the commonly used flocculant PAC, dicyandiamide formaldehyde polymer treatment effect is better with less addition.

Abstract: To explore new pathways of CO₂ geological storage, the mechanism of CO₂ stored in abandoned coal mine gob was analyzed through the investigation of the gobs exploitation current situation. Methods to calculate the capacity to store CO₂ was proposed based on establishing mathematical model. This paper presented suggestions about how to carry out research in the future. Research suggests that after the coal mine is abandoned, there are large underground spaces consisting of rock cavities of gob caving zone, rock fissures of fractured zone, and permanent residual laneways, which CO₂ can be stored, and there will be tremendous sequestration potential. Compared with deep aquifers storage, the space has the advantages of larger scale porosity, simpler storage mechanism, easier injection, more abundant geological data, etc. At the same time, the space also remains problems such as lower seal strength and failure of overburden strata easily causing CO₂ leaks, etc. This paper suggests that six aspects should be further researched in the future.

Abstract: Discharges from pumping stations to rivers have become an important issue in central Shanghai. Based on the analysis of the contaminant concentrations and the volume of discharged water in central Shanghai over the past five years, this research has identified that the discharges from pumping stations to watercourse were composed of DWDs and WWDs. The total annual discharges were approximately 155 to 202 million cubic meters. The contaminant concentrations in the DWDs were close to those in the local domestic wastewater (DW), while the WWDs usually had higher concentrations of the contaminants than the local DW. In central Shanghai, the total contaminant discharges (2008 to 2012) from pumping stations were 72,900-95,700 t·a^-1 for suspended solids (SS), 67,300-88,100 t·a^-1 for chemical oxygen demand (COD), 20,200-27,100 t·a^-1 for biochemical oxygen demand (BOD₅), 2,000-3,000 t·a^-1 for ammonia-nitrogen (NH₃-N), 4,100-5,900 t·a^-1 for total nitrogen (TN), and 800-1,300 t·a^-1 for total phosphate (TP).