Desulfurization wastewater pretreatment system based on ceramic membrane

Abstract

The invention discloses a desulfurization wastewater pretreatment system based on a ceramic membrane. The system mainly comprises a medicine feeding device, a reaction sedimentation tank, a filter press, an ultrafiltration membrane tank, a ceramic ultrafiltration membrane assembly, a fiber membrane nanofiltration assembly and the like. Desulfurization wastewater firstly passes through the NaOH adding device, the Na2CO3 adding device, the PAC adding device and the PAM adding device in sequence, and is subjected to reaction and precipitation in the reaction precipitation tank. Lower-layer sludge in the reaction sedimentation tank enters a filter press for sludge dewatering, and supernatant overflows to the ultrafiltration membrane tank. Part of Ca < 2 + >, Mg < 2 + > and suspended matters in the wastewater treated by the reaction sedimentation tank can be removed, and the problems of blockage, scaling and the like in an ultrafiltration process are greatly reduced. The ceramic ultrafiltration membrane assembly is immersed in the ultrafiltration membrane pool, negative pressure provided by the ultrafiltration water production pump serves as driving force, part of COD and most suspended solids in wastewater treated by the ceramic ultrafiltration membrane can be removed, and the problems of corrosion, blockage and the like of the nanofiltration process are solved. Ultrafiltration produced water enters a nanofiltration membrane assembly after being pressurized, monovalent salt and divalent salt can be separated, and most of COD can be removed.

Description

technical field [0001] The invention relates to a desulfurization wastewater pretreatment system based on a ceramic membrane, and belongs to the field of environmental engineering. Background technique [0002] As my country's primary energy structure determines that coal-fired power generation will continue to occupy a dominant position in China's power structure for a long time to come. However, there is a spatial and temporal mismatch between coal reserves and water resources in my country, and the spatial distribution of power demand and energy supply centers is also uneven, which undoubtedly poses a huge challenge to my country's electricity-water relationship. my country's environmental protection requirements are becoming more and more stringent, and wastewater discharge standards are constantly improving. The realization of wastewater discharge standards and water resource recycling is of great significance to my country's sustainable development. [0003] More than...

AI Technical Summary

Problems solved by technology

The existing pretreatment process is mainly based on chemical precipitation. Although it is easy to reduce hardness ions, it is difficult to manage and operate under the optimal chemical dosage, especially in the face of large changes in the quality of desulfurization wastewater and secondary pollution due to the consumption of chemicals. And a large amount of sludge makes the operation cost high, and it is difficult to separate the first and second ions, which increases the difficulty of the subsequent evaporation and concentration process, and ultimately reduces the quality of the effluent