Starch wastewater treatment required extensive optimization because of its high concentrations of organic compounds and concentrated emissions. An environmental friendly dual flocculant, composed of cationic chitosan and anionic poly-glutamic acid, was investigated. Initial mechanistic studies involving independent injections of chitosan and poly-glutamic acid revealed their primary mechanisms of charge neutralization and bridging respectively. The highest removal rates of turbidity by chitosan and poly-glutamic acid were 90.1% and 91.8%. Dosing pattern studies showed that initial chitosan dosing provided the highest removal rate and widest effective pH range. Mechanistic studies using zeta potential and floc measurements, confirmed that chitosan neutralized negative charges, while long-chained poly-glutamic acid aggregated particulates. The effects of wastewater quality storage time, compound ratio, and total dosage were studied, with optimization at 0 h, 1:1, and 80 mg L⁻¹, which outperformed traditional flocculants polyaluminium chloride and polyferric sulfate. The removal rates of chemical oxygen demand, total nitrogen, total phosphorus and turbidity were 44.8, 53.4, 28.1, and 98.3%. The sediment was detected containing 95% of organic matters and 5.6% of total nutrients making it an excellent organic fertilizer. This dual system is promising in starch wastewater treatment and resource recovery considering its eco-friendly and effective flocculation performance.

淀粉废水的处理由于其高浓度的有机化合物和高浓度的排放物而需要进行广泛的优化。研究了一种由阳离子壳聚糖和阴离子聚谷氨酸组成的环保型双重絮凝剂。涉及独立注射壳聚糖和聚谷氨酸的初步机理研究表明，它们分别是电荷中和和桥接的主要机理。壳聚糖和聚谷氨酸对混浊的去除率最高，分别为90.1％和91.8％。加药模式研究表明，最初的壳聚糖加药提供了最高的去除率和最宽的有效pH范围。使用zeta电位和絮凝物测量的机械研究证实，壳聚糖可中和负电荷，而长链聚谷氨酸会聚集颗粒。^-1优于传统絮凝剂聚氯化铝和聚硫酸铁。化学需氧量，总氮，总磷和浊度的去除率分别为44.8％，53.4％，28.1％和98.3％。检测到的沉积物含有95％的有机物和5.6％的总养分，使其成为极好的有机肥料。考虑到其生态友好和有效的絮凝性能，这种双重系统有望在淀粉废水处理和资源回收中发挥作用。