Purifying biogas from CO 2 (carbon dioxide) and H 2 S (hydrogen sulfide) needs to be done to improve the quality of the biogas in the fuel. The presence of H 2 S in biogas can cause corrosive to the equipment, in addition to this, H 2 S is also dangerous for human and animal health. CO 2 contained in Biogas is also an impurity that can cause corrosive beside H 2 S so the contained in biogas is also an impurity that can cause corrosive, so the purification process needs to be done in order to qualify biogas as natural gas which environmentally friendly and safe for health. The basic ingredient of biogas purification using water scrubbers base ingredients are water, which flowed pressurized biogas purification column from the bottom, of the column in order to reduce CO 2 and H 2 S gases. The result of purification by using this method was that the levels of H 2 S in biogas reduced by 32.8 % while the CO 2 content decreased by 21.2 %. It can be concluded that the H 2 S gas more soluble in the water compared with CO 2 , as H 2 S gas has higher efficiency removal from CO 2 .

The aim of this work is to develop an integrated control of anaerobic digesters in wastewater treatment plants, to ensure optimal depollution performances. To achieve this goal, we have to summarise our knowledge in a mathematical model, which is an essential tool for control design.Various control strategies can be chosen, but their performances are very different (stabilisation, biogaz production,F F F). Each of them is evaluated through 3 criteria. Then we present an original linear model for process stability which take into account the input pollution (flow rate, concentration). We show with simulations how this model help us to select the appropriate control strategy and the improvement of depollution efficiency.

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The control strategies adopted in formulation and anaerobic digestion (AD) process of chicken manure (CM) for the control and enhancement of biogas production are reviewed. The existing limitations and future challenges in the production of biogas from AD of CM are briefly discussed. The control strategy adopted for formulation is pretreatment of CM (physical, chemical, biological, and thermal) while strategies for AD include selection of optimal parameters (pH, C/N ratio, organic loading rate (OLR), and temperature), co‐AD with other substrates, and addition of supporting materials. The pretreatment of CM, selection of optimal parameters, Co‐AD of CM with other substrates, and addition of supporting materials overall enhance biogas and methane production due to increase of hydrolysis and C/N and decrease of ammonia inhibition, CO2 and H2S contents. The implementation of developed control strategies in continuous plants, development of new strategies, and use of supporting materials in combinations of two or three for better performance are the future challenges in the AD of CM. The control strategies had a significant impact on the efficient use of CM and improved biogas and methane production.