电化学脱水干化技术在环保疏浚底泥中的应用

Application of electrochemical dehydration drying technology in environmental dredging sediment

针对环保疏浚底泥含水率高、压缩性大、脱水时间长、纳泥场地供给不足等技术难题,进行电化学脱水干化方法的研究。将场区分成4个单元,即单向真空、单向电化学、双向真空和双向电化学单元,开展现场平行对比试验。结果表明,电化学单元较真空预压单元脱水效果明显,考虑到电能功耗和脱水效果,中电压(30~60 V)是最优外加电压值。双向排水结构对电化学脱水干化技术起到很好的加强作用,可实现多批次高效固定场地的异位脱水处理,对土地资源有限的城区具有一定的工程推广意义。

Regarding the technical problems of high-water content, high compressibility, long dehydration time and insufficient supply of slime field in environmental dredging sediment, we study the electrochemical dehydration drying technology. The field area is divided into four units, namely the unidirectional vacuum, the unidirectional electrochemical, the double direction vacuum and the double direction vacuum electrochemical units, and the parallel comparison test is carried out. The results show that the dehydration effect of the electrochemical unit is more obvious than that of the vacuum preloading unit. Considering the power consumption and dehydration effect, the medium voltage(30 V to 60 V)is the optimal applied voltage value. In addition, the bidirectional drainage structure plays a good role in strengthening the electrochemical dehydration drying technology, which can realize the ectopic and efficient dehydration of multiple batches at fixed sites, and has certain engineering promotion significance for the urban areas with limited land resources.