THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

Application of low-cost adsorbents for dye removal – A review

https://cyberleninka.org/article/n/999493.pdf

New trends in removing heavy metals from industrial wastewater

Activation of persulfate (PS) and peroxymonosulfate (PMS) and application for the degradation of emerging contaminants

Landfill leachate treatment: Review and opportunity

Ozone has a high oxidation level and is typically used to improve the removal of organic and inorganic components. In this study, we investigated the performance of ozone in the removal of COD and color from mature landfill leachate with low concentration of COD and different volumes of samples (2, 5, and 10 L). The highest removal of COD (22%) and color (88.3%) was obtained in the lowest volume of ozonated sample. We studied ozone decomposition during 1 h of reaction time and found increases in ozone decay with increasing sample volume. Ozone consumption for COD removal was calculated, and the highest amount of consumed ozone (0.54 Kg/ Kg COD) corresponded to the highest removal of COD in the lowest sample volume. Biodegradability, as measured by lab scale aeration, increased from 23% to 42% after ozonation of dilute leachate. Findings indicate that the performance of ozone improves with decreasing sample volume, and that biodegradability of stabilized leachate is improved by ozonation.

Performance of Ozone Reactor in Treating Stabilized Landfill Leachate: Efficiencies and Limitations

The objective of this paper is to presents and study a pre-review of Malaysian rice ash ask as a partial cement replacement in different percentage, grinding time and performance corrosion of RHA blended concrete The increasing demand for producing durable construction materials is the outcome of the fast polluting environment Supplementary cementitious materials prove to be effective to meet most of the requirements of durable concrete Rice husk ash is found to be greater to other supplementary materials like silica fume and fly ash Due to its high pozzolanic activity, both strength and durability of concrete are enriched Addition of rice husk ash to Portland cement not only improves the early strength of concrete, but also forms a calcium silicate hydrate gel around the cement particles which is highly dense and less porous This may increase the strength of concrete against cracking Previously, investigation on the corrosion performance of rice husk ash blended concrete is very limited Further researches are ongoing or have started recently by the authors to study the performance of RHA and corrosion of concrete mixes Various tests were carried out to evaluate durability of concrete made with 10, 20, 30 and 40% replacements of RHA by weight of cement Nevertheless, the results of compressive strength, absorption test and chloride penetration from previous investigation were presents in this study

/pdf/malaysian-rice-husk-ash-improving-the-durability-and-4p6n7fhsiz.pdf

Malaysian rice husk ash – improving the durability and corrosion resistance of concrete: pre-review

Large amounts of hydrocarbons are extracted, produced, refined and handled on land every year. Despite improvements in careful handling, transportation and containment, there is still the possibility that some may enter the environment. The accidental release of oil has been shown to cause serious damage to natural ecosystems when improperly managed. The catastrophic oil spill accidents have been occurred to marine environments and several methods have been suggested for petroleum clean up in aquatic ecosystems. This article briefly reviews the most recent development and advances of physical, chemical and biological techniques as well as data interpretation which are most frequently used in oil spill clean up studies, including dispersants, demulsifiers, cleaners, booming, low pressure flushing, bioremediation and several
other emerging techniques. The issue of how bioremediation are employed for cleaning sea waters is also addressed.

Oil spill cleanup techniques in the marine environment

Leachate is created, while water penetrates through the waste in a landfill, carrying some forms of pollutants. Sequencing Batch Reactor (SBR) is one of the biological methods for treating wastewater. The current research studied the removal of sulfide, phenols and hexavalent chromium from landfill leachate and domestic wastewater using Powdered ZELIAC (PZ), Powdered Activated Carbon (PAC) and powdered zeolite (PZE) augmented SBR process. The ZELIAC is a new adsorbent, which consists of zeolite, activated carbon, limestone, rice husk ash and Portland cement. Based on batch experiments and optimization experiments, powdered adsorbents dosage (PZ, PZE and PAC dosages = 3 g LG1), settling time (90 min) and leachate-to-wastewater mixing ratio (20%; v/v) were fixed. The results indicated that the PZ-SBR showed higher performance in removing phenols, sulfide and hexavalent chromium compared with SBR, PZE-SBR and PAC-SBR. And also the PZE-SBR showed higher performance in removing Cr (VI) compared with SBR and PAC-SBR. In the PZ-SBR, the removal efficiencies for phenols, sulfide and Cr (VI) were 67.71, 74.13 and 79.24%, respectively.

Sulfide, phenols and chromium (VI) removal from landfill leachate and domestic wastewater by ZELIAC, zeolite and activated carbon augmented sequencing batch reactor (SBR)

Palm oil wastewater treatment was investigated via a filtration process using raw and calcinated limestone. Column studies were conducted using different limestone sizes (4, 12, and 20 mm), calcination temperature (800 °C and 600 °C) and various filtration rates (20, 60, and 100 mL/min), and a comparison was made with raw limestone under similar conditions. The response surface methodology using central composite design was employed to optimize the process parameter. The experimental data was analyzed via the analysis of variance to identify the interaction between the parameters and the dependent parameter. The results showed that the colour removal increased with an increase in temperature (800 °C) for filtration rate of 20 mL/min, the retention time of 317 min and the smaller size (4 mm) of limestone, and decreased with an increase in the filtration rate and size of raw limestone. Based on the achieved results, the optimum condition for colour removal was at temperature 800 °C (61%), 600 °C (56%) and raw limestone (49%), respectively, with the same experimental setup (flow rate of 20 mL/min and limestone size of 4 mm). According to the statistical analysis, quadratic models demonstrated significant values (0.000) for the response (colour). Freundlich and Langmuir isotherms also provided good correlation coefficient for colour removal. The data conforms to the Langmuir isotherm with the best fit model (R2 = 0.7).

/pdf/performance-of-horizontal-roughing-filter-for-colour-removal-2lbrd98ikt.pdf

Hamidi Abdul Aziz

Papers

Performance of Ozone Reactor in Treating Stabilized Landfill Leachate: Efficiencies and Limitations

Malaysian rice husk ash – improving the durability and corrosion resistance of concrete: pre-review

Oil spill cleanup techniques in the marine environment

Sulfide, phenols and chromium (VI) removal from landfill leachate and domestic wastewater by ZELIAC, zeolite and activated carbon augmented sequencing batch reactor (SBR)

Performance of Horizontal Roughing Filter for Colour Removal of Palm Oil Mill Effluent Using Natural Adsorbent