精准加药系统在土工管袋固化清淤泥浆工程中的应用

Application of precision dosing system in geotextile bag solidification and dredging mud engineering

为提高土工管袋固化清淤泥浆工艺的可靠性,开发了泥浆固化精准加药系统,并应用于江苏省G湖清淤工程。结果表明,泥浆浓度为10%~15%时,最佳的PAC/干泥量之比为0.2%,PAM/干泥量之比为0.6‰。精准加药系统实时检测泥浆流量和浓度,计算出所需的加药量,指令加药计量泵准确投加所需的加药量,实际的加药量与计算加药量的误差在±5%左右。出水浑浊度、总氮、总磷、氨氮、高锰酸盐指数平均值分别为26.8 NTU、6.29 mg/L、0.19 mg/L、1.02 mg/L、5.04 mg/L;土工管袋内固化泥浆含水率迅速下降到70%,2周后下降到60%,5周后下降到50%。

In order to improve the reliability of the solidification and dredging mud technology for geotextile bags,a precise dosing system has been developed for mud solidification and applied to the G Lake dredging project in Jiangsu Province.The results showed that when the mud concentration was between 10%and 15%,the optimal PAC/dry mud ratio was 0.2%,and the PAM/dry mud ratio was 0.6‰.The precise dosing system detects the mud flow rate and concentration in real-time,calculates the required dosage,and instructs the dosing metering pump to accurately add the required dosage.The error between the actual dosage and the calculated dosage is about±5%.The average values of effluent turbidity,total nitrogen,total phosphorus,ammonia nitrogen,and permanganate index are 26.8 NTU,6.29 mg/L,0.19 mg/L,1.02 mg/L and 5.04 mg/L,respectively;The moisture content of the solidified mud inside the geotextile bag rapidly decreased to 70%,decreased to 60%after two weeks,and decreased to 50%after five weeks.