Sweet potato starch wastewater (SPSW) is an industrial food-processing waste product, which is a significant pollution source due to its high chemical oxygen demand (COD), nitrogen, and phosphorus loads. The influence of hydrolytic acidification (HA) process on C, N, and P as well as other main parameters were evaluated. It is essential to treat these wastewaters with effective methods such as HA, a general pretreatment application. In this study, we investigate the scientific link between the changes of different fractions of C, N, and P with particle size distribution in response to the newly introduced HA process. Results showed that the levels of COD, TN, and TP remained ultimately stable; pH and suspended solids (SSs) decreased obviously. HA process exhibits excellent capability of reducing the larger particulars (with diameter of >5 μm) into smaller ones (with diameter of <0.1 μm). The most significant initial concentration contribution to COD, TN, and TP pollution came from particles and matter with a diameter of >5 μm, at 41.8, 57.3, and 43.5%, respectively. While the most significant contribution to COD, TN, and TP was resulting from micro-molecular size particles (<0.1 μm) after 48 h. The smallest particles (<0.1 μm) were the most dominant contribution to all pollutants measured, with COD, TN, and TP contributions of 63.2, 50.4, and 59.3%, respectively. While the contribution of larger particles (particle size >5 μm) reduced to 10.2, 15.3, and 7.1%, respectively.

中文翻译：

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水解酸化过程中红薯淀粉废水的粒径分数与碳，氮和磷的发生和转化有关。

甘薯淀粉废水（SPSW）是一种工业食品加工废品，由于其化学需氧量（COD），氮和磷含量较高，因此是重要的污染源。评估了水解酸化（HA）工艺对C，N和P以及其他主要参数的影响。必须使用有效的方法（例如通用预处理HA）来处理这些废水。在这项研究中，我们调查了C，N和P的不同部分的变化与粒度分布之间的科学联系，以响应新引入的HA过程。结果表明，COD，TN和TP的水平最终保持稳定。pH值和悬浮固体（SSs）明显下降。HA工艺具有出色的减少较大细节的能力（直径> 5微米）切成较小的直径（直径<0.1微米）。对COD，TN和TP污染最显着的初始浓度贡献来自直径> 5μm的颗粒和物质，分别为41.8、57.3和43.5％。而对COD，TN和TP的最显着贡献是由48小时后的微分子大小的颗粒（<0.1μm）引起的。最小的颗粒（<0.1μm）是所有所测污染物的最主要贡献，其中COD，TN和TP的贡献分别为63.2％，50.4和59.3％。而较大颗粒（粒径> 5μm）的贡献分别降低至10.2、15.3和7.1％。分别为41.8、57.3和43.5％。而对COD，TN和TP的最显着贡献是由48小时后的微分子大小的颗粒（<0.1μm）引起的。最小的颗粒（<0.1μm）是所有所测污染物的最主要贡献，其中COD，TN和TP的贡献分别为63.2％，50.4和59.3％。而较大颗粒（粒径> 5μm）的贡献分别降低至10.2、15.3和7.1％。分别为41.8、57.3和43.5％。而对COD，TN和TP的最显着贡献是由48小时后的微分子大小的颗粒（<0.1μm）引起的。最小的颗粒（<0.1μm）是所有所测污染物的最主要贡献，其中COD，TN和TP的贡献分别为63.2％，50.4和59.3％。而较大颗粒（粒径> 5μm）的贡献分别降低至10.2、15.3和7.1％。