Steel acid pickling wastewater treatment system

Abstract

The invention provides a steel acid pickling wastewater treatment system which comprises a raw water pump, a filter press, a cross flow organic tubular ultrafiltration membrane device, a mixed liquidcontainer, a booster pump, a reverse osmosis membrane device, a nanofiltration membrane device and a liquid conveying pipeline, wherein the raw water pump is used for feeding steel acid pickling wastewater needing to be treated; the filter press is used for primarily filtering raw water; the cross flow organic tubular ultrafiltration membrane device is used for ultrafiltration; the mixed liquid container is used for mixing the ultrafiltered raw water with reclaimed water generated by the nanofiltration membrane device; the booster pump is used for pumping the liquid in the mixed liquid container into the reverse osmosis membrane device; the reverse osmosis membrane device is used for performing reverse osmosis treatment and generating recyclable clear water; the nanofiltration membrane device is used for retreating concentrated water output by the reverse osmosis membrane device and generating recyclable acid water; and the liquid conveying pipeline is used for connecting all components. Compared with the prior art, the steel acid pickling wastewater treatment system has the advantages that the structure is simplified, the cost is reduced, and when the steel acid pickling wastewater treatment system is used, the production efficiency can be greatly improved, and energy is saved.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a steel pickling wastewater treatment system. Background technique [0002] In the production process of steel pipes and other steel products, it is generally necessary to pickle and then rinse with clean water. After the clean water is rinsed, it becomes pickling wastewater. The direct discharge of pickling wastewater is not allowed because it does not meet the environmental protection requirements. At the same time, it is directly discharged Also cause the waste of water resource. Therefore, the pickling wastewater needs to be treated accordingly. The traditional treatment methods for pickling wastewater usually use neutralization-coagulation-precipitation-press filtration-generation of filter cake-landfill. The existing problem is that the landfilled filter cake will still cause a certain degree of pollution to the soil, and the treatment cost High and long process time, ...

AI Technical Summary

Problems solved by technology

The traditional treatment methods for pickling wastewater usually use neutralization-coagulation-precipitation-press filtration-generation of filter cake-landfill. The existing problem is that the landfilled filter cake will still cause a certain degree of pollution to the soil, and the treatment cost High and long process time, the efficiency is not high enough

Its system is mainly composed of water inlet channel, bag filter as primary filter, ceramic ultrafilter as ultrafilter, booster pump, front-stage reverse osmosis equipment, rear-stage reverse osmosis equipment, graphite evaporator and reclaimed water , acid water reuse pipelines, etc. This set of steel pickling wastewater treatment system can theoretically realize the treatment and recycling of pickling wastewater. However, in production practice, it has the following problems and deficiencies: First, its The bag filter used in the primary filtration will be blocked by waste residue and needs to be replaced in about 10 hours of actual use, which is not economical and affects production efficiency; secondly, the ceramic ultrafilter used in the ultrafiltration itself has no The degreasing effect, if it is used continuously for about 1 hour, it will be blocked and needs to be flushed for cleaning. At the same time, the acid resistance to hydrofluoric acid and nitric acid in the wastewater is not strong and easy to be damaged; The concentration of acid water produced by the permeation equipment cannot meet the requirements for recycling. Therefore, it is necessary to use graphite evaporator to further evaporate the acid water to separate the acid water with a concentration that can be reused. However, the graphite evaporator needs to consume A large amount of electric energy or steam greatly increases the treatment cost of pickling wastewater

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