An alternative way to remove CO2 from biogas is the use of photosynthetic microorganisms, such as microalgae. This can be achieved by operation an open photobioreactor, connected with a mass transfer column, counterflow column. technology provides up-graded high quality. The microalgal uptake in columns generates pH changes microalgae culture. To clarify potential effect these dynamic condition...

The pH control process has been used in industry in a wide number of applications. Its dynamics are highly nonlinear. The pH control process is subjected to uncertainties of mathematical model describing the kinetics changes of chemical process and the external disturbances. The pH control process using the PID control technique will be investigated in this paper. The setting and adjustment of ...

This paper presents an indirect adaptive control scheme for a pH process, which is diicult to control due to its nonlinear dynamics with uncertainties. A nonlinear controller is designed using a backstepping technique which can deal with a large class of nonlinear systems with parametric uncertainty. The nonlinear controller is combined with a parameter estimator to estimate the concentrations ...

1 Introduction pH control is the process of adding acid or base to opposing solutions aiming to achieve a solution of pH 7, defined as neutral solution. The function of the controller is to achieve a neutral output of the system. This in itself is not an easy problem to solve as pH control of a neutralisation process is a difficult non-linear control problem. This is largely due to the inherent...

The aim of this paper is to present approximated model of pH process applicable for simulation and control. The highly nonlinear dynamical properties of the pH value to the addition of acid or base make the pH control very difficult. Changes in process sensitivity with pH makes difficult to design conventional controllers. Proposed pH model approximation allows formulating advanced control algo...

In pH reactors, determination and control of pH is a common problem concerning chemical-based industrial processes due to the non-linearity observed in the titration curve. We introduced a modified multiregional fuzzybased control system to overcome the complexity of precise control of pH. In order to compensate for the experimental inaccuracies in measurements of pH in-situ values; an observer...

This paper presents an artificial intelligence approach on modeling highly nonlinear processes with application to pH neutralization process. The hybrid neuro-fuzzy technique is applied to model the titration curve from a weak acid with a strong base. This titration curve has three major parts that describe the system behavior: above the equivalence point, near equivalence point and under equiv...

Sundberg, C. 2005. Improving compost process efficiency by controlling aeration, temperature and pH. Doctoral dissertation. ISSN 1652-6880, ISBN 91-576-6902-3 Biowaste composting is rapidly increasing, and many composting plants in Scandinavia have had problems with low pH during the process. The aim of this thesis was to develop methods to improve process efficiency in large-scale composting. ...