The traditional Pu'er tea fermentation is uses the man-power to moisten naturally in the workshop piles the fermentation, this fermentation way cannot guarantee that in the Pu'er tea fermentative process the humidity uniformity, produces the workshop and the Fermentation plant to the Pu'er tea carries on the design and the research, the microorganism technology, the machine-finishing technology and the electric control technology merges into one organic whole, causes the Pu'er tea the production standardization, and has the scientific nature. The Pu'er tea fermented the clear purification workshop to unify the technology which the tradition fermented, used modernized the examination control technology and the equipment, by humidity sensor, PLC master control equipment, computer constitutions and so on processing system, Canadian wet equipment and supervisory system. This article through constructs the Pu'er tea to ferment the clear purification workshop, carries on the controlto the workshop ambient humidity, causes the Pu'er tea to be stable in fermentative process environment, and has carried on the production testing under this kind of environment, obtains the experimental correlation data and carries on processing, discovers the Pu'er tea fermentation humidity from the tentative data to form the influence to the Pu'er tea quality some rules, ferments the formalization production for the Pu'er tea to provide the corresponding scientific parameter.

This paper carried out the research on Pu'er fermentation automatic control process, using engineering and biotechnology and the application of parameters in the critical link of Pu'er tea quality formation. Pu'er tea fermentation plant design were optimized; the tide proportion before Pu'er tea fermentation had been carried out accurate quantitative and automatic control study; the temperature and humidity of Pu'er fermentation plant and inside the heap had been real time on-line automatic detected and control using PLC in Pu'er tea fermentation process; the series of projects such as structure and materials of Pu'er tea fermentation container had been carried out research and development. The applications of research results in the production improved the quality of our products and production efficiency.

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Recently, ultraviolet-visible (UV-vis) absorption spectrometry has garnered considerable attention because it enables real-time and unpolluted detection of chemical oxygen demand (COD) and plays a crucial role in the early warning of emerging organic contaminants. However, the accuracy of detection is inevitably constrained by the co-absorption of organic pollutants and turbidity at UV wavelengths. To ensure accurate detection of COD, it is necessary to directly subtract the absorbance caused by turbidity from the overlaid spectrum using the principle of superposition. The absorbance of COD is confined to the UV range, whereas that of turbidity extends across the entire UV-vis spectrum. Therefore, based on its visible absorbance, the UV absorbance of turbidity can be predicted. In this way, the compensation for turbidity is achieved by subtracting the predicted absorbance from the overlaid spectrum. Herein, a straightforward yet robust exponential model was employed based on this principle to predict the corresponding absorbance of turbidity at UV wavelengths. The model was used to analyze the overlaid absorption spectra of synthetic water samples containing COD and turbidity. The partial least squares (PLS) method was employed to predict the COD concentrations in synthetic water samples based on the compensated spectra, and the corresponding root mean square error (RMSE) values were recorded. The results indicated that the processed spectra yielded a considerably lower RMSE value (9.51) than the unprocessed spectra (29.9). Furthermore, the exponential model outperformed existing turbidity compensation models, including the Lambert-Beer law-based model (RMSE = 12.53) and multiple-scattering cluster method (RMSE = 79.34). Several wastewater samples were also analyzed to evaluate the applicability of the exponential model to natural water. UV analysis yielded undesirable results owing to filtration procedures. However, the consistency between the compensated spectra and filtered wastewater samples in the visible range demonstrated that the model is applicable to natural water. Therefore, this proposed method is advantageous for improving the accuracy of COD measurement in turbid water.