The purpose of activated sludge systems is to remove the waste from the polluted water by means of microorganisms. Removing the waste appropriately is one aspect; removing the biosolids from the clean water is another challenge. Hence, the settling tank, in which bioflocs are separated from the liquid by gravity, is a crucial operation in biological wastewater treatment systems. If the settling...

Settling-thickening tanks are used to achieve separation of the liquid and solid fractions of faecal sludge (FS). They were fi rst developed for primary wastewater treatment, and for clarifi cation following secondary wastewater treatment, and it is the same mechanism for solids-liquid separation as that employed in septic tanks. Settling-thickening tanks for FS treatment are rectangular tanks,...

Introduction: Bioassay is necessary for assessment of pollution. Because physical and chemical taste are not enough for assessment of potential effects on water ecosystem. Bioassay tests have alot of scientific value inanition doing of them is easy and need less time, also need less space, laboratory equipment’s and expenditure. Therefor such tests have found special attention in water pollutio...

The aim of this contribution is partly to build consensus on a consistent modelling methodology (CMM) of complex real processes in wastewater treatment by combining classical concepts with results from applied mathematics, and partly to apply it to the clarification-thickening process in the secondary settling tank. In the CMM, the real process should be approximated by a mathematical model (pr...

Computational fluid dynamics simulations are employed to assess the effect of adding a vertical baffle at the feed section of a full-scale edimentation tank for the improvement of solids settling in potable water treatment. A general CFD-based simulation strategy is developed based n the specific features and conditions met in practice for potable water treatment. The linearity of the particle ...

This paper presents the design and modeling of State Feedback with integral controller to implement in a Non-linear Spherical Tank SISO process. By using state feedback, it controls the liquid level in the tank as desired .The aim of this paper is to compare the control performance between State feedback with integral controller with conventional ZN, Luyben Tyreus PI/PID, Controllers. The mathe...

2Associate Professor, JCDM college of Engineering, Haryana, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract The objectives of this paper are to design and comparatively analyze the P, PI, PID and Fuzzy Logic controller for coupled tank liquid level system. Simulink model for coupled tank s...