Technique for treating industrial wastewater of containing sodium sulfate
A technology for industrial wastewater and treatment process, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. It can solve the problems of low treatment efficiency, insufficient cooling time, and increased downtime for maintenance. , to achieve the effect of high process efficiency and energy saving
Inactive Publication Date: 2009-01-07
PANZHIHUA GANGCHENG GROUP RUITONG REFRIGERATION EQUIP
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Problems solved by technology
When this process is running, due to the insufficient cooling time of the thick slurry solution in the existing facilities, the temperature drop is small, and the Na 2 SO 4 The crystallization is not complete, and the Na contained in the solution returned to the system for reprocessing 2 SO 4 The concentration is higher, the concentration of Na 2 SO 4 After the solution returns to the system, it increases the Na in the system 2 SO 4 Concentration, slightly lower temperature, Na 2 SO 4 After crystallization, the pipeline and delivery pump are blocked, resulting in very unstable system operation, low processing efficiency, and increased downtime for maintenance
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[0012] figure 1 The three-stage cooling treatment system of the present invention is shown, that is, the primary crystallization separation system, the intermediate crystallization separation system, and the final crystallization separation system. Each crystallization separation system includes crystallization tanks 4, 16, 34, centrifuges 7, 21 , 32, solution pools 13, 39, 26, the crystallization kettle, centrifuge, and solution pools in each system are arranged according to the upper, middle and lower positions and are connected to each other through pipeline systems 8, 12, 20, 23, 33, 29; primary crystallization The cooling pipeline in the crystallization tank of the separation system is connected to the primary crystallization tank cooling tower 1 through external piping systems 2 and 3 to form a cooling circulation pipeline; the primary solution pool 13 is directly connected to the intermediate crystallization tank 16 through piping systems 18 and 19 Interconnected; Inter...
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This invention discloses a process for treating sodium sulfate-containing industrial wastewater, which is composed of three-stage treatment systems. Each crystal separation system comprises: a crystallization kettle, a centrifugal separator, and a solution pool connected from top to bottom by pipelines. The cooling pipe of the primary crystallization kettle is connected with the cooling column of primary crystallization kettle to form a circulating pipeline of cooling. The primary solution pool is connected with the secondary crystallization kettle by pipeline. The secondary solution pool is connected with the final crystallization kettle by pipeline. The final solution pool is connected with the cooling pipe of secondary crystallization kettle by pipeline to form a circulating pipeline of cooling. The final crystallization kettle is connected with a refrigerator and an expansion water tank to form a circulating pipeline of cooling. The process has high efficiency and saved energy.
Description
technical field [0001] The invention relates to a waste water treatment process for vanadium product enterprises, in particular to a process for treating industrial waste water containing sodium sulfate by a low-temperature cooling method. Background technique [0002] In the process of producing vanadium products, the waste water generated by vanadium products enterprises is treated by the combination of sodium metabisulfite reduction-lye neutralization, plate and frame filter press and evaporation concentration. In the process of evaporation and concentration, a large amount of Na will be produced 2 SO 4 Thick slurry solution, in the thick slurry, Na 2 SO 4 The content reaches 50%-70%. Effectively and timely the Na in the thick slurry 2 SO 4 Crystallization is of great significance to the entire wastewater treatment and will bring significant economic and environmental benefits. Due to the Na discharged from the first-effect separator 2 SO 4 The temperature of the...
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IPC IPC(8): C02F9/02C02F1/58C02F1/38
Inventor 周道选
Owner PANZHIHUA GANGCHENG GROUP RUITONG REFRIGERATION EQUIP