ANALYSIS OF RECYCLING APPLICATION AND RISK CONTROL OF BOTTLE WASHING WASTEWATER IN CHINESE BAIJIU INDUSTRY

To guarantee the safe and efficient recycling of bottle washing wastewater for the Chinese baijiu industry, wastewater characteristics were analyzed, the risk types and factors of different recycling pathways were identified, and then the control methods also were proposed.Resultsdemonstrated that bottle washing wastewater was with a low level of contamination, and the concentration of pollutants was slightly higher than the corresponding water quality standard. Suspended solids, organic matters, and bacteria were the main risk factors, which could trigger some risks for each recycling situation, such as food safety, health risks from microorganisms, nozzles clogging and damaging equipment, etc. The main reason for the differences in risk is that different recycling pathways have different protection targets and focus on different characteristic pollutants. Suspended solids removal was the necessary control measure for bottle washing wastewater recycling. Removal of organic matters and nutrients, and control of bacterial counts were the key control points for each situation respectively. Bottle washing wastewater should be reused for agriculture irrigation as a priority, followed by industrial cooling, washing and production, miscellaneous use in cities, environmental use in landscapes, and reuse in bottle washing processes. The strategies and measures for bottle washing wastewater reuse for Luzhou were proposed. In the future, we should focus on the full process control of the risk of recycling bottle washing wastewater, broaden the ways of wastewater recycling, and integrate it into the urban water ecological cycle cascade utilization. This paper can provide the theoretical basis and technical reference for the safe recycling of bottle washing wastewater.