Advanced Materials Research Vols. 955-959

Abstract: With rapid economic development in China, the frequency of that new buildings replace old buildings increases gradually in rural areas, which inevitably results in the emergence of a large amount of waste clay brick. The processing of construction waste takes up a lot of land resources and worsen the existing rural environmental pollution situation. using waste clay brick to prepare recycled coarse aggregate concrete not only can effectively eliminate construction waste and reduce the consumption of original coarse aggregate and thus the cost of buildings, but also solves a series of environmental problems—it conforms to the concept of "green building" and stands in line with the strategic objectives of sustainable development. This paper researched on the influence of recycled coarse aggregate gradation and water cement ratio to the strength of recycled concrete at first, then experimentally verified the application feasibility of recycled coarse aggregate self-compacting concrete.

Abstract: Abstract: In this paper, according to the domestic large dairy farms waste gas energy environment engineering technology research, forecasts the market application prospect of biogas technology, and analyzes the two kinds of biogas engineering technology characteristics and how to correctly choose the biogas production process.

Abstract: A model to predict the wastewater emission in China was established with comprehensive factor analysis, combining the ARMA and OLS methods. Applied the model, the wastewater emission from 2013 to 2015 in China was predicted. Industry characteristics of wastewater emission between the whole nation and Haihe River basin were analyzed using the 1999 and 2002 water conservancy input-occupancy-output (IOO) tables. The results showed that the national wastewater emission of 2013-2015 will reach 72998, 76897 and 81071 million tons respectively, and industries like paper printing and educational goods manufacturing, chemical industry, discharged a large amount of wastewater and their wastewater emission by unit value added were also very high. In the meantime, wastewater by unit value added of metal smelting and rolling processing industry went down largely from 1999 to 2002, which revealed that the strict supervision had positive effects on reducing wastewater emission.

Abstract: Silver sulfate in waste liquid of COD determining could be recycled by NaCl-H2SO4 technology, the recovery rate could be reached 80.5 %. Make a comparison between recyclable Ag2SO4 and commercially available Ag2SO4, and make seven kinds of wastewater COD experiment. The result of basic statistic analysis showed that recyclable Ag2SO4 could be recycled available for the determination of COD in water. The sulfuric acid in COD waste liquid (except silver) could be recycled by acid retardation technology, the recovery rate could be reached 91.7 %. Ag2SO4 and sulfuric acid in COD waste liquid was effectively recycled by NaCl-H2SO4-acid retardation coupling technology.

Abstract: With the rapid implementation of polymer flooding in Bohai oil field, the produced liquid includes large amount of polymer-containing oily sludge reversed increases year by year. The polymer-containing oily sludge accumulates at the terminal processing plant, which not only obviously degrades the performance of sewage treatment instruments and blocks the oil/water separators, but also has a bad impact on environment. Using thermal chemical treatment technology with dynamical separating agent and optimizing separation conditions, the completed processing technology is obtained as follow: thermal chemical reaction, separation on standing, crude oil recovery and recycling of waste water. The recovery rate of crude oil from the samples treatment is over 94%. The obtained technology plays an important role in recycling of source, environment protection and technical support of increasing produced liquid.

Abstract: According to the decision attributes of green manufacturing and requirements of remanufacturing, an evaluation index system of waste product recycling ability was established, the weight of every level index was determined by using analytic hierarchy process, according to the fuzziness and uncertainty of evaluation index, the recycling ability was evaluated by applying the fuzzy comprehensive evaluation and an example was given. The result shows that the method is simple, accurate and has a good application.

Abstract: In this study, sludge reduction by ultrasound combining anaerobic-anoxic-oxic system (AAO) was developed and examined. Compared with AAO process, 38.07, 46.07 and 50.98% of excess sludge reduction could be obtained by ultrasonic combining AAO system (sludge return ratios of 40%, 60%, and 80%). When the sludge return ratio is 60%, ultrasound combining AAO system can achieve the best sludge reduction effect. Chemical oxygen demand (COD) removal rates of ultrasound combining AAO system were 88.21, 89.77, and 90.31%, respectively. The introduction of sludge disruption by ultrasound pretreatment did not affect the COD removal ability of the AAO system, whereas increased in the COD removal efficiency. This combined biological treatment system could realize sludge reduction and improve nutrient removal efficiencies.

Abstract: The characteristics such as pH, dry matter, carbon concentration, the total solid and volatile solid of kitchen wastes produced by a canteen in Guangzhou were measured. The anaerobic digestion process performances were evaluated through the examination of operational conditions like activated sludge inoculation, temperature on SS, biogas production, COD concentration and pH in the reactor. When the proportion between kitchen wastes to seed sludge inoculation was 1:1, the biogas production reached the peak at 45 °C. The kitchen waste pH decreased at the first four days then increased adversely after 4 days digestion, but COD concentration showed the opposite variation.

Abstract: In this article, Fenton oxidation treatment technology was employed to the improving of quality of post treated wastewater from pulp & paper mills in order to increase the recycling ratio of final treated wastewater. The reaction conditions were optimized through single-factor experiments and the removal of color were tested for the optimizing. It was found in this study that the color of Fenton oxidation treated water was variegated with the extending of settling time. The optimized conditions were: Dosage of H₂O₂ was 682.1mg/L(30% m/m), 1.5 times theoretical consumption, 205mg/L FeSO₄7H₂O (H₂O₂:FeSO₄=15:1), the initial pH and the reaction time were 4.5 and 40min, respectively. The removal of the color and COD were 51.3% and 80% after Fenton treatment. GC-MS analysis shown that the contents of organic extracts and most of organic compounds reduced significantly after the oxidational treatment.

Abstract: Sludge-based Activated Carbon(SAC) was carried out on the method of chemical activation and high temperature pyrolysis, using municipal sludge as the main raw materials, mixed with a small amount of corn straw. Through the analysis of characterization of activated carbon, the best quality blending ratio of straw is 10% ; the dynamic adsorption results of tail liquid of landfill leachate show that SAC can effectively remove most of harmful substances in the tail liquid of landfill leachate and the effluent reached the vertical ground surface standard of the standard for pollution control on the landfill site for domestic waste .