Cleaner production of monosodium glutamate in China

Monosodium glutamate (MSG) is frequently used in Chinese cuisine, and China produces approximately 80% of the MSG used worldwide. The MSG industry has long been receiving increased attention from the government and the public because of its wastewater discharges. In this study, a comprehensive review of the MSG industry development from 2005 to 2015 in China was conducted. The results revealed great progress in cleaner production (CP) promotion based on significantly reduced energy and water consumption. Moreover, the findings showed that implementation of the best available techniques (BAT) for pollution prevention by the MSG industry played a key role in these improvements. Indicators of energy and resources consumption and pollution production were also reviewed and their potential for CP was clarified. The influence mechanisms were classified into external and internal factors for CP promotion in the MSG industry, while the external compulsory mechanisms combined with supportive policy had a great influence on CP promotion. It also acted to stimulate concern regarding the environment and encourage research and improved management for the MSG industry. The internal mechanisms driven by external influences have helped the MSG industry make great progress in CPMoreover, integrated utilization of the tail liquid, unorganized emitted waste gas and excess sludge disposal are still challenges faced by the MSG industry in China.