The Effect of Fe3+ on Microbial Growth and Physical and Chemical Properties of Activated Sludge

2013 ◽  
Vol 864-867 ◽  
pp. 1319-1322
Author(s):  
Shan Hong Lan ◽  
Rui Chen ◽  
Ping Ma ◽  
Cong Cong Li ◽  
Hui Xia Lan
Keyword(s):  
Activated Sludge ◽  
Microbial Growth ◽  
High Efficiency ◽  
Removal Rate ◽  
Chemical Properties ◽  
Lag Phase ◽  
Logarithmic Phase ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

The method of activated sludge has been widely used in the process of sewage treatment for its high-efficiency and low-consumption. The effect of Fe3+ on microbial growth and physical and chemical properties of activated sludge were studied to obtain relevant parameters for the running of activated sludge system in this paper. Firstly, study on the effect of Fe3+ on microbial growth was carried out. The experiment results showed that the lag phase of microbial growth was obviously reduced with the presence of Fe3+, obtaining advancing into the logarithmic phase. Whats more, the value of OD600 reached to the maximum of 0.615 at 12h when the concentration of Fe3+ was 30mg/L. Secondly, the effects of Fe3+ on the wastewater treatment and that of the performance index include SVI and MLSS were studied. The results indicated that SVI decreased with increasing the dosages of Fe3+,while MLSS and removal rate of COD obviously increased which reach to the maximum of 88.21% when the concentration of Fe3+ was 30mg/L.

Physical and chemical properties of waste-activated sludge after microwave treatment

2010 ◽  
Vol 44 (9) ◽  
pp. 2841-2849 ◽  
Author(s):  
Qiang Yu ◽  
HengYi Lei ◽  
Zhong Li ◽  
HuaLiang Li ◽  
Kai Chen ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Chemical Properties ◽  
Microwave Treatment ◽  
Waste Activated Sludge ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

scholarly journals Design and performance of urban sponges in red soil: improvement of physical and chemical properties

2020 ◽  
Author(s):  
Yunpeng Jing ◽  
Jian Li ◽  
Yimin Mei ◽  
Xiao Liu ◽  
Xuelan Yu ◽  
...  
Keyword(s):  
Removal Rate ◽  
Orthogonal Experiment ◽  
Chemical Properties ◽  
Soil Improvement ◽  
Physical And Chemical Properties ◽  
Sponge City ◽  
Coral Sand ◽  
Cod Removal Rate ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract This study investigated the physical and chemical properties of a single or combination of permeable materials which can be used as fillers in the Sponge City program in China. Four types of fillers, perlite, coral sand, vermiculite and ceramsite, were selected from six alternative fillers by an analytic hierarchy process. The optimal city sponge, which consists of vermiculite (10 cm), ceramsite (15 cm), perlite (15 cm), coral sand (20 cm) and Canna indica L, was found by the orthogonal experiment (L16(45)). The results of the simulated rainwater experiment of the optimal sponge showed that the permeability coefficient K10, NH3-N, TP and COD removal rate were 1.20 ± 0.23 mm/s, 96.6 ± 0.2%, 36.8 ± 0.07% and 9.6 ± 0.07% respectively. The results suggested that the optimal sponge had an excellent treatment effect on NH3-N in rainwater while ensuring rapid infiltration. It provided a simple, economical and effective method for rainwater treatment and the Sponge City program in the future.

scholarly journals Effect of Heat-Treatment Remediation on the Mechanical Behavior of Oil-Contaminated Soil

2020 ◽  
Vol 10 (9) ◽  
pp. 3174
Author(s):  
Meng-Chia Weng ◽  
Chiou-Liang Lin ◽  
Cheng-Hsi Lee
Keyword(s):  
Heat Treatment ◽  
Physical Properties ◽  
Contaminated Soil ◽  
Removal Rate ◽  
Chemical Properties ◽  
Total Petroleum Hydrocarbons ◽  
Size Analysis ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

The heat treatment of oil-contaminated sites is widely carried out for the purposes of remediation. However, heat treatment changes the physical and chemical properties of soil. Before the soil can be reused as a construction material in civil engineering, such as in backfill or road base materials, the changes to its physical properties must be understood. Therefore, this study investigates the changes in the physical and chemical properties of oil-contaminated soil after heat treatment. In this investigation, experimental samples of soil with added oil from a refinery plant are used to investigate the removal rate of total petroleum hydrocarbons (TPHs) by thermal desorption and incineration. The physical properties of the soil, including water permeability and mechanical properties, are compared before and after heat treatment. The results of this study are as follows. (1) Particle size analysis reveals that heat treatment makes soil particles finer. (2) In the burning reduction test, heat treatment at 900 °C removes more than 90% of THP. (3) In the direct shear test, the friction angle (ϕ) increases with the removal rate. (4) In the hydraulic test, as the removal rate increases, the permeability coefficient increases after heat treatment.

Study on Optimization of CMP Slurry for Tantalum in ULSI Based on Taguchi Method

2010 ◽  
Vol 129-131 ◽  
pp. 794-798 ◽  
Author(s):  
Hui Lai Mu ◽  
Sheng Li Wang ◽  
Zhen Xia Li ◽  
Wen Zhong Xu ◽  
Xia Xiang
Keyword(s):  
Taguchi Method ◽  
Chemical Mechanical Polishing ◽  
Surfactant Concentration ◽  
Removal Rate ◽  
Chemical Properties ◽  
Alkali Concentration ◽  
Physical And Chemical Properties ◽  
Oxidant Concentration ◽  
Physical And Chemical ◽  
And Chemical Properties

Chemical mechanical polishing (CMP) has become an essential technique in advanced ULSI process. The mechanism of Ta CMP is discussed in this paper. According to the physical and chemical properties of Ta, the alkaline polishing slurry and proper process parameters for Ta CMP are prepared. The paper optimized four key parameters-abrasive concentration, organic alkali, oxidant and surfactant concentration, obtained the comprehensive optimized slurry used in evaluating the removal rate using Taguchi method. The results indicate that: abrasive concentration is 10%, the organic alkali concentration is 15ml/L, the oxidant concentration is 10ml/L and the surfactant concentration is 10ml/L, higher removal rate can be obtained.

Ultra-Precision Polishing Methods for Sapphire

2014 ◽  
Vol 654 ◽  
pp. 20-23
Author(s):  
Hui Xue Bao ◽  
Qiang Liu ◽  
Xiao Qin Zhou
Keyword(s):  
Material Removal Rate ◽  
Material Removal ◽  
Removal Rate ◽  
Chemical Properties ◽  
Optical Field ◽  
Inert Material ◽  
Physical And Chemical Properties ◽  
Ultra Precision ◽  
Physical And Chemical ◽  
And Chemical Properties

Sapphire (Al2O3 crystal) is a hard and inert material with good mechanical, optical, physical and chemical properties that plays important roles in optics and electronics. The surface quality is the key element of sapphire components especially in optical field. This paper mainly introduces four methods of ultra-precision polishing, researches based on polishing theories and slurry. It can be a conclusion that traditional polishing methods can improve material removal rate assisted by ultrasonic.

scholarly journals Flow microreactor synthesis in organo-fluorine chemistry

2013 ◽  
Vol 9 ◽  
pp. 2793-2802 ◽  
Author(s):  
Hideki Amii ◽  
Aiichiro Nagaki ◽  
Jun-ichi Yoshida
Keyword(s):  
Organic Compounds ◽  
High Efficiency ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Chemical Substances ◽  
Fluorine Chemistry ◽  
Flow Microreactor ◽  
Fluorine Compounds ◽  
Physical And Chemical ◽  
And Chemical Properties

Organo-fluorine compounds are the substances of considerable interest in various industrial fields due to their unique physical and chemical properties. Despite increased demand in wide fields of science, synthesis of fluoro-organic compounds is still often faced with problems such as the difficulties in handling of fluorinating reagents and in controlling of chemical reactions. Recently, flow microreactor synthesis has emerged as a new methodology for producing chemical substances with high efficiency. This review outlines the successful examples of synthesis and reactions of fluorine-containing molecules by the use of flow microreactor systems to overcome long-standing problems in fluorine chemistry.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

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