Treatment method of lead-containing wastewater

Abstract

The invention discloses a treatment method of lead-containing wastewater. The treatment method sequentially comprises the steps of: (1) respectively adding a membrane surfactant at a volume ratio of 3%-5% and a flowing carrier at the volume ratio of 4%-10% to a membrane solvent at the volume ratio of 85%-93% and stirring at a low speed for 10-15 min to prepare a membrane phase; (2) slowly adding an internal water phase medicament having the same volume as the membrane phase to the membrane phase and stirring at a high speed for 10-30 min to prepare a water-in-oil type emulsion; and (3) adding the prepared emulsion to the wastewater at a lead concentration of 10-1000 mg / L until the pH of an external water phase is 3.0-5.5, standing for laying after stirring at a high speed for 30-60 min, breaking the emulsion obtained after the layering through a high-voltage electric field, and separating out an oil phase and an internal water phase, wherein the discharged water can reach the national discharge standard. The treatment method of the lead-containing wastewater disclosed by the invention is fast, efficient, energy-saving and free from phase change, purifies water quality, gathers and recycles heavy metal ions and has simple equipment, convenient operation, a lead removal rate of more than 99.9% and unprecedented application foreground in the field of heavy metal wastewater treatment.

Description

technical field [0001] The invention relates to a treatment method for lead-containing waste water, which relates to the removal of lead in waste water in industries such as storage battery production, ore dressing, petroleum processing, lead smelting, and recycling of waste lead-acid storage batteries, and belongs to the field of waste water treatment in environmental protection. Background technique [0002] Lead is a widely distributed element in nature and one of the elements commonly used in industry. It mostly exists in the form of sulfide in nature, and only a small amount is in the state of metal, and often coexists with zinc, copper and other elements. Lead and its compounds are non-degradable environmental pollutants, which can flow into the environment in large quantities through waste water, waste gas, and waste residues, and directly or indirectly enter the human body through the food chain, soil, water, and air, causing damage to the hematopoietic system, causin...

AI Technical Summary

Problems solved by technology

The chemical precipitation method has simple equipment, convenient operation, and good treatment effect. At present, it is widely used in the treatment of high-concentration and large-flow lead-containing wastewater, but the cost is high, the treatment capacity is small, the selectivity is poor, the sludge volume is large, and the sludge is not easy to process. Disposal, easy to cause secondary pollution

The ion exchange method has the advantages of small footprint, convenient management, high lead ion removal rate, and proper treatment can make the regeneration liquid be recycled as a resource, which will not cause secondary pollution to the environment, but the one-time investment is large and the operating cost is high. Susceptible to pollution or oxidation failure, frequent regeneration, and certain difficulties in regeneration

The electrolysis process is mature, has a high removal rate, no secondary pollution, and the precipitated heavy metals can be recycled. It has strong adaptability to the change of wastewater quality and short reaction time, but it consumes a lot of energy and electrode metal when treating a large amount of wastewater. , not suitable for high concentration wastewater

The liquid membrane method purifies the water quality and enriches and recovers heavy metals, which has double effects. However, due to the difficulty of the liquid membrane technology, the surfactants used to prepare the emulsifier liquid membrane have few varieties, poor performance, and unqualified demulsification technology, etc. , hindering the industrialization of the law

The biological adsorption method does not use chemicals, the amount of sludge is very small, there is no secondary pollution, the discharged water can be reused, the metal in the bacteria sludge can be recovered and the bacteria sludge can be used as fertilizer, and the microbial treatment effect on lead ions is good at low concentrations , but it is easily affected by many factors such as pH value, temperature, metal ion concentration, biofilm culture conditions, coexisting heavy metal ions, etc.