Technology for using organic contaminated high salinity wastewater to produce industrial refined salt

A technology for high-salt wastewater and organic pollution, applied in the direction of water pollutants, water/sewage treatment, neutralized water/sewage treatment, etc., can solve problems such as no treatment process, not in line with environmental protection concepts, production hazards, etc., to reduce equipment Investment cost, solution to waste gas treatment problems, and significant environmental benefits

Active Publication Date: 2017-03-15
NANJING GW ENVIRONMENT ENG
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  • Abstract
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  • Claims
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Problems solved by technology

However, this process produces a new hazardous waste after wastewater treatment, and there is no subsequent treatment process, which does not conform to the concept of environmental protection. The process has huge defects and is not a complete treatment process.
[0007] Patent CN 201610072785.2 discloses an advanced oxidation-salt separation and crystallization combined system for high-salt industrial wastewater. This system discloses a process for treating high-salt wastewater with advanced ozone oxidation, multi-effect evaporation, and freeze crystallization. Can this process be traditional? The biochemical oxidation method is insufficient to remove COD; however, in the actual operation process, the work requirements of the ozone oxidation device are high, and there are certain dangers in the production process, and in the process, the organic matter is removed first, and then the brine without organic matter is treated. In the process of evaporation and crystallization, in the case of incomplete removal of organic matter, a small amount of organic matter will easily remain in the brine, which will affect the purity of the subsequent industrial salt. At the same time, after the treatment is completed, there will be certain pollution in the subsequent treatment.
[0008] Patent CN 201610072782.9 discloses a high-salt industrial wastewater salt-separation zero-discharge system. The system discloses a process for treating high-salt wastewater by using salt-separation nanofiltration, advanced oxidation, evaporation or freeze crystallization. The process mainly uses classification The nanofiltration process grades various inorganic salts in high-salt water, which achieves the characteristics of zero pollution discharge, but the salt-separation nanofiltration process itself is relatively cumbersome, and the efficiency of membrane separation operations for high-salt wastewater is low. ; Because its purpose is mainly to realize the classified treatment of various salts, the treatment effect is poor for organic waste water with only NaCl, and it cannot fully treat organic matter

Method used

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  • Technology for using organic contaminated high salinity wastewater to produce industrial refined salt
  • Technology for using organic contaminated high salinity wastewater to produce industrial refined salt
  • Technology for using organic contaminated high salinity wastewater to produce industrial refined salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The wastewater in this implementation example is taken from the high-salinity wastewater of a certain pesticide factory, and the main product is chlorpyrifos, and its initial data are as shown in Table 2:

[0036] Table 2 Raw water initial data

[0037]

[0038] It can be seen from the data in Table 2 that the salt content in the wastewater is very high, above 10%; the concentration of organic matter is very high, and the organic matter belongs to the toxic and harmful substances of pesticides. Other pollution indicators such as ammonia nitrogen and total phosphorus are also high. In the production process of wastewater generation, the use of heavy metals is not involved, so the content of heavy metals is not very high, and the index of heavy metals is not the research focus of this experiment.

[0039] Waste water in table 2 is produced according to technique of the present invention, and its concrete experimental effect is as shown in table 3:

[00...

Embodiment 2

[0044] Example 2: The wastewater in this implementation example is taken from a pesticide factory with high salinity wastewater, the main product is chlorpyrifos, and its initial data are shown in Table 2. The raw water in Table 2 was tested according to the experimental steps in Table 4, and the specific effects are shown in Table 4:

[0045] Table 4 Details of experimental steps and experimental results

[0046]

[0047]

[0048] It can be seen from the data in Table 4 that the sequence in the process is impurity removal, evaporation and crystallization. In the impurity removal process, the phosphorus, calcium magnesium, ammonia nitrogen, organic matter and other factors in the raw water are mainly removed. After the impurity removal, the removal effect on impurity ions is not ideal, especially for the removal of organic matter. . Evaporation and crystallization is carried out on the waste water after impurity removal, and a part of impurity ions are taken away in th...

Embodiment 3

[0051] Embodiment 3: The operation method of the thermal desorption step of hazardous waste salt in step 3 of the present invention is as follows (using a secondary rotary kiln):

[0052] 1) Send the hazardous waste salt into the first-level rotary kiln, and pass the hot air heated by domestic gas into the rotary kiln. The temperature of the hot air is in the range of 100-150°C, and the hazardous waste salt is dried in and out to increase the salt fluidity;

[0053] 2) Enter the hot air and volatile organic compounds at the outlet of the first-stage rotary kiln into the natural gas heating furnace, on the one hand, increase the temperature of the hot air to within the range of 300-600°C; The organic waste gas produced by the kiln is incinerated and oxidized without causing air pollution;

[0054] 3) Pass the hot air heated to 300-600°C into the second-stage rotary kiln, and oxidize the salt initially dried in the first-stage rotary kiln at high temperature again, fully oxidiz...

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PUM

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Abstract

The invention discloses a technology for using organic contaminated high salinity wastewater to produce industrial refined salt. The technology comprises the steps of conducting pretreatment and oil removal on the organic contaminated high salinity wastewater, afterwards, leading the pretreated organic contaminated high salinity wastewater into a secondary evaporation crystallizer in a multiple-effect evaporative crystallization system to be subjected to multiple-effect evaporation, obtaining risky waste salt particles after multiple-effect evaporation dewatering, leading the risky waste salt particles into a multi-stage ring kiln to be subjected to thermal desorption treatment, removing organic matter in the risky waste salt and obtaining solid particles, conducting dissolution and impurity removal on the solid particles, removing carbon dregs, phosphorous, ammonia nitrogen and calcium and magnesium in the solid particles to obtain a saline solution, leading the saline solution again into a primary evaporation crystallize in the multiple-effect evaporative crystallization system, and obtaining the industrial refined salt after evaporative crystallization. According to the technology for using the organic contaminated high salinity wastewater to produce the industrial refined salt, the technology is intact, resource utilization of the organic contaminated high salinity wastewater can be directly achieved, a set of evaporative crystallization device is saved, the problem of waste gas treatment in thermal desorption of the risky waste salt is effectively solved; meanwhile, the whole technological process is simple and automation of an operation can be achieved.

Description

technical field [0001] The invention relates to the technical field of treatment of salty wastewater, in particular to a process for preparing industrially refined salt from organically polluted high-salt wastewater. Background technique [0002] In the pesticide, chemical, printing and dyeing, pharmaceutical and other industries, a large amount of high-organic salt-containing wastewater will be generated, with a salt content of about 10% and an organic concentration of more than 10,000 mg / L. This kind of wastewater is not suitable for microbial growth, so biological treatment technology is not feasible; if it is treated by chemical methods, the high concentration of chloride ions in it will greatly reduce the oxidation effect of oxidants, so the use of chemical oxidation technology is not only expensive, but also the treatment effect is not good. . [0003] At present, the treatment technology for this kind of high-salt and high-organic waste water is to use evaporation cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01D3/14C02F101/30
CPCC01D3/14C02F1/048C02F1/66C02F2001/5218C02F2101/30
Inventor 韩正昌何建龙高小山孙在臣张良陈涛韩峰王云枫马军军高亚娟张寅丞朱伯淞陶志慧
Owner NANJING GW ENVIRONMENT ENG
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