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The emission standards of non-methane total hydrocarbon were tightened from 120 mg/m³ to 10 mg/m³ for Chinese industries in 2012. Despite the investment into environmental treatment, many factories have since been struggling to hit the emission reduction target. Emissions from various production processes have the characteristics of low concentration and intermittency, so the conventional ventilation systems relying on high flow rates to collect and exhaust the low-concentration pollutants often result in large scale, high economic and energy consequences, but poor performance. In this study, a novel circulating system was proposed to concentrate pollutants and reduce the exhaust air volume using a rubber refining process as an example. Firstly, a circulating ventilation model based on the mass balance was established to predict the variation of pollutant concentration within the system, and two control …