Advanced Materials Research Vols. 726-731

Abstract: It is estimated that there are 0.33 billion tons of hazardous waste per year over the world. the scientific management of hazardous waste, effective guidance on the whole process and effective utilization become necessary. From this point, this thesis takes China’s Dalian Xizhong Petrochemical Park as the research object, using Multi-level evaluation model of grey system of hazardous waste processing project evaluation, then setting up Xizhong Island Petrochemical Park optimization of hazardous waste processing and disposing methods.We innovatively construct the combination of open type and closed type of hazardous waste disposal and management bus system, which is of great significance to achieve efficient management of hazardous waste.

Abstract: Taking granular sludge, the anaerobic granular sludge and the aerobic granular sludge were treated by IC reactor. According to the changes of COD, SS and so on removal rate of out-flow water, the granular sludge was judged to turn into particles degree. The result indicate that when the influent organic load upgrade 385.7g COD/d eventually after 8 times, the HRT reaches 5h, the reflux is 1.4L/h, removal rate of COD is 84.7%. The SS concentration of out-flow water fluctuated largely throughout the experiment. During the experimentation, it was found that if the water content was higher and the density was lower in the micro-aerobic, the anaerobic granular sludge disintegrated seriously, particle size showed a narrowing trend and a large number of fragments fell and suspended in reactor.

Abstract: In order to treat dyeing-printing wastewater, the experiment took reflux tank, self-regulating control valve making of medical infusion, air flow meter, dissolved oxygen instrument, aerator pumps and aeration equipment under the micro-aerobic condition by IC reactor. The result indicates that the concentration of dissolved oxygen at 0.3 ~ 0.5 mg/L, increasing the load of mixed water and in-flow water by 25% and 7% separately in turn, the experiment is feasible. When COD load reached 2188.2 mg/ L in the mixed wastewater, the components in printing and dyeing wastewater are poisonous and repressive to the grown of granular sludge, which also illuminates that the function of micro-aerobic granular sludge treating printing and dyeing wastewater is limitary. When the influent load reached 4655.1mg / L or so, dissolved oxygen was 0.3 ~ 0.5mg / L, HRT was 6h, the reactor worked best, this moment, the removal rate of COD could reach 85.8%.

Abstract: The solid waste and sludge from the expressway service area was mixed and composted. The changes of temperature, pH and total carbon, total nitrogen, humic matter, and the toxicity for the seed were investigated. The results indicated that: the temperature above 55°C was more than 6 days, which could meet the harmless standard. The pH value quickly increased and then decreased, stabilized in the neutral range. The total carbon decreased obviously and the nitrogen also decreased significantly high to 33%in the first 12 days, which indicated the activity of the microorganism was strong and the degradation of organic matter was quickly, the ammonia was produced much, and the high temperature phase made the loss of nitrogen. The increases of fulvic acid and humic acid showed the conversion of organic matters to humus. Composting decreased the matters inhibiting seed germination and weakened the toxicity for the plant, and the sample reached maturity through composting. This study is a beneficial way of ecological application in expressway service solid waste treatment.

Abstract: Along with the acceleration of urbanization in Beijing, the waste systems in place they have now, cannot meet its growing population, living standards and a better environment. This paper investigates the operation of the waste logistics process from the perspective of green logistics. The paper discusses the problems that exist relating to collection, classification, transportation and final disposition in Beijing. It also lays out the format of green logistics relating to municipal household waste.

Abstract: This paper studies the preparation of baking-free brick using the tailings of flue gas desulfurization of pyrolusite slurry, aiming to explore the optimal technological conditions. Experimental results show that the particle size of the tailings of flue gas desulfurization of pyrolusite slurry with the concentration up to 95% is below 80μm, which are the appropriate material for the preparation of baking-free bricks. "Byproduct tailings of flue gas desulfurization of pyrolusite slurry - cement cementitious materials - water" system is a relatively good ingredient program. The test results indicate that the flexural and compressive strength of the baking-free brick sample increases with the rise of forming pressure. Appropriately adding the dosage of binder could improve the flexural and compressive strength of the baking-free brick sample, but when it is added to a certain degree, the strength will decrease instead. To sum up, the optimal parameters of the baking-free brick product are shown as follows: desulfurization tailings: cementitious materials = 5:1, the forming pressure is 20 MPa, the moisture content is 10% and the natural curing time is controlled in the range of 7-28 days.

Abstract: In this study, the contents of polycyclic aromatic hydrocarbons (PAHs) in sewage sludge (SS) and solid residue (SR) from supercritical water gasification of SS were analyzed and the pollution degree and human health risk with PAHs in SS and SR samples were determined. SR samples were collected from different reaction condition, according to different reaction temperature, time and water content. The results show that the contents of PAHs in SR samples were increased after gasification reaction, ranging from1541 to 8234.8μg/kg, and that the PAHs with 4-6 rings are major pollutants in the SR samples. Based on Nemero Index P, the classification evaluation shows that the SR samples almost exceed the light polluted. While, the health risk assessment according to Benzo [pyrene total potency equivalents present that the health risks from PAHs are acceptable for children and adults using the SR sample for agricultural land.

Abstract: Liquid organic radioactive waste is one kind of wastes from the use of radioisotopes in research centres, medical and industrial applications and also in nuclear power plants. Effective management of these liquid organic wastes is necessary in order to ensure their safe handling, processing, storage and disposal. Cementation for Tri-N-Butyl Phosphate/Odorless Kerosene (TBP/OK) solvents was studied. Emulsifiers were selected and compared. Calcium sulfoaluminate cement (SAC) was used in TBP/OK solidification. A prescription containing 20% (v/v) TBP/OK was obtained. And the compressive stretch is above 10MPa. The leach rates of Sr²⁺, Cs⁺, Co²⁺ were studied. Monolithic solids were formed.

Abstract: Nanchong city has a history of more than 2200 years. Nanchong city has a population of 795000 people in 2010, and the city Gas utilization rate is 96.03% .city sanitation department of life garbage disposal way as the focus on sanitary landfill. This document explains and demonstrates how to predict city solid waste, based on solid waste amount , from 2011 to 2015 , per month fee rates are 11.75 to 16.71 yuan/family by polluters pay principle (PPP).

Abstract: It is the first time to remove sodium from the fly ash red mud by soda-lime sintering process to determine whether the fly ash red mud can be used in cement production. This paper studies the effects of the reaction time, the reaction temperature, the ratio of liquid to solid, and the amount of sodium removal agent on the removal of milk of lime method of fly ash red mud in sodium. The optimal reaction conditions are that: the reaction time is 120min, the reaction temperature is 90°C, the ratio of liquid to solid ratio is 6:1, and the ratio of sodium removal agent Ca (OH) ₂ to the red mud of Na₂O use ratio is 9:1. Under this condition, the sodium removal rate (Na₂O, the same below) to 57.2%, the total sodium content in fly ash red mud decreases from 4.7% to 1.8% after sodium removal, achieving the expected goal.