Method for regulating stainless steel acid cleaning wastewater
A technology of pickling wastewater and adjustment methods, which is applied in the field of chemical treatment, can solve the problems of huge equipment investment, non-development, non-utilization, etc., and achieve the effects of improving economic benefits, realizing environmental protection, and improving filter press efficiency
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Embodiment 1
[0019] Using the pickling wastewater produced by a certain stainless steel as raw material, its pH was measured to be 1.4, and its operating temperature was 23°C; a comparative test is now carried out on it:
[0020] First of all, lime milk is used alone for first-level coarse adjustment. Although the pH of the water at the outlet of the coarse adjustment tank is controlled between 2.55 and 2.85, the pH fluctuation range of the clam at the outlet of the primary sedimentation tank is between 2.9 and 4.2.
[0021] according to figure 1 In the process shown, the same pickling wastewater as above is used as the raw material, and the pH is adjusted roughly with milk of lime to control the pH to about 2.7; , the fine-tuned base pH is 3.25; due to the hysteresis reaction of milk of lime, the effluent of the settling tank is just between pH 3.45 and 3.50; and the subsequent sludge pressure filtration speed is shortened from the previous 2.5h / plate. 1.5h / per plate after implementation...
Embodiment 2
[0023] according to figure 1 In the process shown, the pickling waste water from a stainless steel production enterprise is now used as the raw material. Its pH is 1.6 and the operating temperature is 25°C; under normal pressure, it is first roughly adjusted with milk of lime to control the pH to about 2.6. ;Then use milk of lime to carry out fine adjustment to the stainless steel pickling waste water of discharge and fine adjustment tank, the base pH of fine adjustment is 3.25; Because the hysteresis reaction of lime milk, the effluent of the settling tank is just in between pH3.45~3.50; Moreover, the speed of the subsequent sludge filter press was shortened from 2.5h / per plate before the implementation to 1.5h / per plate after the implementation. After measurement, the chromaticity of the effluent dropped from 180 times to 70 times, the residual chromium in the waste mud dropped from the original 1.2% (dry basis) to about 0.7%, and the residual nickel dropped from the origina...
Embodiment 3
[0025] according to figure 1 In the process shown, the pickling waste water of a stainless steel production enterprise is now used as raw material, and its pH is measured to be 1.3. First, it is roughly adjusted with lime milk to control the pH to about 2.8; then it is discharged and finely adjusted with lime milk. The stainless steel pickling wastewater in the pond is fine-tuned, and the base pH of the fine-tuning is 3.2; due to the hysteresis reaction of lime milk, the effluent from the sedimentation tank is just between pH 3.45 and 3.50; The previous 2.5h / per board will be shortened to 1.5h / per board after implementation. After measurement, the chromaticity of the effluent dropped from 180 times to 60 times, the residual chromium in the waste mud dropped from the original 1.3% (dry basis) to about 0.7%, and the residual nickel dropped from the original 0.80% to 0.45. %. It provides very favorable conditions for the subsequent stable compliance of wastewater treatment and ...
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