Emergency pretreatment system of source water with excessive iron and manganese and treatment method thereof

Abstract

The invention discloses an emergency pretreatment system of the source water with excessive iron and manganese and a treatment method thereof, belonging to the source water treatment field. In the system of the invention, a water inlet pipe is connected with a calcium hydroxide solution preparation tank; a mixing and reacting region is communicated with a solid-liquid separation region; and the solid-liquid separation region is connected with a resin regeneration tank and a water outlet pipe. The treatment method comprises the following steps: calcium hydroxide solution is added in the water inlet pipe to perform coagulation reaction, the coagulation effluent is precipitated and treated in an inclined tube sedimentation tank, the effluent enters a complex reactor integrating ion exchange,solid-liquid separation and regeneration to remove residual manganese ions and calcium ions, a magnetic conveyor belt is used to separate magnetic cation exchange resin in the effluent from water, the conventional treatment of the effluent is performed, and magnetic cation exchange resin is regenerated in the regeneration tank by using diluted hydrochloric acid and sent back to the mixing and reacting region. The system of the invention is convenient to operate and the concentrations of iron and manganese in water can fast meet the water quality standard of the drinking source water. The system is stable to run and can fully utilize the original water purification equipment of the water plant.

Description

technical field [0001] The invention relates to emergency pretreatment equipment and methods for water source water, more specifically an emergency pretreatment system and treatment method for source water with iron and manganese exceeding standards. Background technique [0002] Excessive iron and manganese ions in the water will not only lead to changes in the color of the water body, but also increase the hardness. Drinking source water with excessive iron and manganese ions will cause diarrhea and digestive tract diseases. The concentration of iron ions in the source water should be lower than 0.5mg / L, and the concentration of manganese ions should be lower than 0.1mg / L. The main reasons for the excessive iron and manganese ions in the water body are as follows: 1) Iron and manganese are common heavy metal ions in soil and sediment. In some areas, iron and manganese content in soil and sediment are very high, and they are easy to be released under certain conditions. Fo...

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Problems solved by technology

[0003] At present, the methods for removing iron and manganese ions in water mainly include membrane filtration, chemical precipitation, electrochemical method and natural mineral adsorbent adsorption method. These methods have the following problems in the application process: 1) Membrane filtration is harmful to organic and inorganic Pollutants have a good removal effect, but the problem of membrane pollution has not been effectively solved so far, and the operating cost of membrane filtration is high, which is not suitable for large-scale promotion and application of large water plants; Ions have a good removal effect, but they are not suitable for the removal of low-concentration heavy metal ions; 3) The electrochemical method has the disadvantages of complicated operation and high energy consumption; 4) Although some water plants use manganese sand and other mineral adsorbents to filter , Adsorption and removal of iron and manganese ions in water, but in the process of research and practical application, it is found that the manganese sand filtration method has the disadvantages of low adsorption capacity, slow adsorption rate and difficult regeneration of iron and manganese ions, especially in the treatment of seasonal In the process of polluting source water, the manganese sand filter material is easily blocked by organic matter and some suspended solids in the water, which greatly affects the filtration performance

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