The effluents of the gelatin acidification process are highly complex and difficult to treat, especially in the presence of high concentrations of Cl⁻, which not only pollute the environment, but also seriously hamper the development of bone gelatin enterprises. In this study, a novel cleaner production process for recycling the highly concentrated calcium and chloride ions is proposed to basically solve the problem of acidification wastewater management in the gelatin industry. In this process, wastewater from the acidification process is firstly reacted with sulfuric acid to generate calcium sulfate and then the effluent is further treated by distillation. The outcomes demonstrate that the concentration and recycling rate of hydrochloric acid in the distillate could reach close to 6.1% and 75% under the optimal conditions, and the recycled hydrochloric acid could be reused in the acidification process. Meanwhile, the emission of wastewater could be reduced about 70%. The purity (98%) and composition (calcium sulfate hemihydrate) of the calcium sulfate were explored by X-ray photoelectron spectrometer and X-ray diffraction. The output of CSH was 75 kg per tonne of wastewater (11.5T per tonne of gelatin). Additionally, analyzing the operational cost of this process shows that about the operational costs could be halved. In conclusion, this novel process minimizes the wastewater discharge and achieves the cleaner production in gelatin industry.

明胶酸化过程的流出物是高度复杂和难以治疗，尤其是在高浓度的Cl的存在下^-不仅污染环境，而且严重阻碍骨明胶企业的发展。在这项研究中，提出了一种用于回收高浓度钙和氯离子的新型清洁生产工艺，以从根本上解决明胶工业中酸化废水管理的问题。在此过程中，酸化过程中的废水首先与硫酸反应生成硫酸钙，然后将废水通过蒸馏进一步处理。结果表明，在最佳条件下，馏出液中盐酸的浓度和回收率可以分别达到接近6.1％和75％，回收的盐酸可以在酸化过程中再利用。同时，废水排放量可减少约70％。用X射线光电子能谱仪和X射线衍射仪研究了硫酸钙的纯度（98％）和组成（硫酸钙半水合物）。CSH的产量为每吨废水75千克（每吨明胶11.5吨）。另外，分析此过程的运营成本表明，大约可以将运营成本减半。总而言之，这种新颖的工艺可以最大程度地减少废水排放，并在明胶工业中实现更清洁的生产。