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Coking wastewater chloride ion removing pretreatment method
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A technology for coking wastewater and chlorine removal, which is applied in water/sewage treatment, chemical instruments and methods, neutralized water/sewage treatment, etc. Effect
Inactive Publication Date: 2017-05-10
ZHONGBEI UNIV
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When zero discharge of coking wastewater is achieved only by relying on wind blowing loss and leakage sewage, one quarter to one fifth of the supplementary water of circulating water is biochemically treated wastewater with high content of COD and various ions, and the conductivity is as high as 16000μs / cm, chloride ion 13000mg / L, total hardness up to 1650 mg / L, circulating water is reddish-brown, off-white, the whole process has the disadvantages of fouling and serious corrosion, and the packing of cooling tower is easily collapsed by sludge, which even affects the normal operation of the enterprise production; and as time increases, the chloride ions in the biochemical wastewater will gradually increase, and when the concentration of chloride ions in the wastewater entering the biochemical pool is too high, it will affect the effect of biochemical treatment, making the effluent unable to meet the discharge standard
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Embodiment 1
[0027] Select COD 3680 mg / L, conductance as high as 16000μs / cm, chloride ion as high as 13000mg / L, total hardness as high as 1650 mg / L, and pH around 9 for treatment. The steps are as follows:
[0028] Add phosphoric acid according to the chloride ion reduction target. For every 10% reduction, you need to add phosphoric acid 3.6g / L, a total reduction of 30%, that is, 10.8g / L, stir evenly, filter and measure the pH value of the first filtrate to 5.5; then add the filtrate to : 10 silicate and lime to adjust the pH of wastewater to 7, stir evenly, filter, and measure the pH value, conductivity, chloride ion, hardness, and COD value of the second filtrate again.
[0029] from figure 1 and figure 2 It can be seen from the comparison that while reducing the chloride ion, conductivity, and COD value, the color of the water also gradually decreases and becomes clear, from the purple of the raw water to light yellow or even colorless, indicating that the preferential adsorption of t...
Embodiment 2
[0031] Select COD 3680 mg / L, conductance as high as 16000μs / cm, chloride ion as high as 13000mg / L, total hardness as high as 1650 mg / L, and pH around 9 for treatment. The steps are as follows:
[0032] Add phosphate dicalcium hydrogen phosphate according to the chloride ion reduction target, stir evenly, filter and measure the pH of the filtrate to 6; add 1:9 silicate and lime to the filtrate to adjust the pH of the wastewater to 7.1, stir evenly, filter, and measure the filtrate again pH value, conductivity, chloride ion, hardness, COD value.
Embodiment 3
[0034] Select COD 3680 mg / L, conductance as high as 16000μs / cm, chloride ion as high as 13000mg / L, total hardness as high as 1650 mg / L, and pH around 9 for treatment. The steps are as follows:
[0035] Add phosphate calcium dihydrogen phosphate according to the chloride ion reduction target, stir evenly, filter and measure the pH of the filtrate to 6.5; add 1:8 silicate and lime to the filtrate to adjust the pH of the wastewater to 6.9, stir evenly, filter, and measure the filtrate again pH value, conductivity, chloride ion, hardness, COD value.
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Abstract
The invention discloses a coking wastewaterchlorideion removing pretreatment method, belongs to the technical field of wastewater treatment, and relates to coking wastewater treatment. The coking wastewaterchlorideion removing pretreatment method includes the steps: (1) adding phosphoric acid into coking wastewater, adjusting PH (potential of hydrogen) to range from 5.5 to 6.5, and precipitating and filtering the wastewater after uniform mixing; (2) adding silicate and lime into filtrate, adjusting the PH to range from 6.9 to 7.2, and precipitating and filtering the filtrate after uniform mixing. By adding the inorganic silicate, phosphate and the lime, chloride ions are precipitated, the hardness and electrical conductivity of the coking wastewater are reduced, particularly, wastewater COD (chemical oxygen demand) and chromaticity are reduced after refractory organics are precipitated, redundant phosphate can serve as a biological treatment wastewater nutrient, addition is omitted in a later period, subsequent biochemical treatment is facilitated, circulating water requirements are met, and the method is particularly applicable to concentration circulating water with high chloride ion content.
Description
technical field [0001] The invention belongs to the technical field of wastewater treatment, relates to the treatment of coking wastewater, in particular to a pretreatment method for removing chloride ions from coking wastewater. Background technique [0002] Coking wastewater is difficult-to-treat industrial wastewater containing volatile phenols, polycyclic aromatic hydrocarbons, and heterocyclic compounds such as oxygen, sulfur, and nitrogen. It has the characteristics of high CODcr, high phenol value, and high ammonianitrogen. There are three main sources of coking wastewater: one is residual ammonia water, which is the wastewater produced in coaldry distillation and gas cooling, and its water volume accounts for more than half of the total coking wastewater, which is the main source of coking wastewater; The waste water produced in the process, such as gas final cooling water and crude benzene separation water, etc.; the third is the waste water produced in the refini...
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