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Method for processing saponified sewage

A treatment method and saponification technology, which are applied in the field of solid-liquid separation of lime milk residue, can solve the problems of high labor intensity, high concentration of suspended solids, and the influence of the period of sludge cleaning in treatment facilities, so as to prolong the cleaning period of sludge, The direct economic benefits are obvious and the indirect economic benefits are considerable.

Active Publication Date: 2007-08-15
BALING PETRO CHEM CO LTD SINOPEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The natural sedimentation speed in the sedimentation tank is slow, the sedimentation effect is poor, a large amount of lime residue cannot be effectively precipitated and separated, and the content of suspended solids in the effluent of saponification water is at the lowest when it is 1000mg / L, Ca 2+ When the content is the lowest, there are still 9000mg / L
Going directly to the next link will have a great impact on the sludge cleaning cycle of its treatment facilities;
[0007] (2) The use of grab buckets to manually dig slag cannot meet the needs of continuous slag discharge of the device. During non-working hours, especially at night, due to excessive sediment, the sedimentation and separation capacity of the sedimentation tank is reduced, and the concentration of suspended solids in the discharged wastewater is high (the content of suspended solids in the effluent reaches 10000mg / L), the slag content is larger;
[0008] (3) The water content of the mud slag is more than 90%, which not only increases the transportation cost, but also causes secondary pollution to the environment after the burial because the water in the mud slag contains pollution sources such as organic matter;
[0009] (4) The acidity and alkalinity of sewage cannot be effectively controlled, and it can only be controlled within the range of pH 7-12
[0012] (1) No flocculant is used, and the settling effect is poor;
[0013] (2) The plate and frame filter press needs to be backwashed, and the operation cannot be continuous and automatic;
[0014] (3) The plate and frame filter press takes a lot of labor and is labor intensive

Method used

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  • Method for processing saponified sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Polyaluminum chloride is selected as the flocculant, configured as a 0.1% aqueous solution, stored in the flocculant tank (4), the average treatment water volume of saponified sewage is 300t / h, SS is 6200mg / L, and the addition of the flocculant aqueous solution The amount is 30Kg / h (the addition of flocculant is about 10mg / h Kg污水 ), enter the mechanical acceleration clarifier (1) after being mixed by the mixer I (6), the effective residence time of the control treated water in the mechanical acceleration clarifier is 30 minutes, and the mud settled in the mechanical acceleration clarifier (1) enters the decanter (2) Carry out centrifugal dehydration, and the mud cake after centrifugal dehydration is landfilled with automobiles, and the separated sewage is returned to the mechanical acceleration clarifier (1) for circular clarification; the supernatant in the mechanical acceleration clarifier (1) is mixed with hydrochloric acid The hydrochloric acid sent from ...

Embodiment 2

[0033] Example 2: The flocculant selects polyacrylamide with a solid molecular weight of 14 million, configures it into a 0.2% aqueous solution, and stores it in the flocculant tank (4). The average treatment water volume of saponified sewage is 200t / h, and the SS is 6500mg / L. The addition amount of flocculant aqueous solution is 30Kg / h (the addition amount of flocculant is about 30mg / h Kg污水 ), enter the mechanical acceleration clarifier (1) after being mixed by the mixer I (6), the effective residence time of the control treated water in the mechanical acceleration clarifier is 45 minutes, and the mud settled in the mechanical acceleration clarifier (1) enters the decanter (2) Carry out centrifugal dehydration, and the mud cake after centrifugal dehydration is landfilled with automobiles, and the separated sewage is returned to the mechanical acceleration clarifier (1) for circular clarification; the supernatant in the mechanical acceleration clarifier (1) is mixed with hydroc...

Embodiment 3

[0036] Embodiment 3: Sodium polyacrylate is selected as the flocculant, configured as a 0.5% aqueous solution, stored in the flocculant tank (4), the average treatment water volume of saponified sewage is 200t / h, SS is 6300mg / L, and the addition amount of the flocculant aqueous solution 30Kg / h (the addition of flocculant is about 75mg / h Kg污水), enter the mechanical acceleration clarifier (1) after being mixed by the mixer I (6), the effective residence time of the control treated water in the mechanical acceleration clarifier is 45 minutes, and the mud settled in the mechanical acceleration clarifier (1) enters the decanter (2) Carry out centrifugal dehydration, and the mud cake after centrifugal dehydration is landfilled with automobiles, and the separated sewage is returned to the mechanical acceleration clarifier (1) for circular clarification; the supernatant in the mechanical acceleration clarifier (1) is mixed with hydrochloric acid The hydrochloric acid sent from the tan...

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Abstract

The present invention ptovides saponified sewage treating method, and the method is one mechanical speeded clarification plus horizontal screw centrifugal machine separation plus neutralization method. The method has the functions of smooth running, high economic property, high controllability and high separation effect.

Description

technical field [0001] The invention relates to a treatment method for saponified sewage, in particular to a treatment method for solid-liquid separation of lime dregs in saponified sewage produced in the production process of epichlorohydrin and propylene oxide. Background technique [0002] Saponification sewage is the alkali slag wastewater discharged from the saponification process, mainly containing CaCl 2 , Ca(OH) 2 , CaCO 3 , chloropropane, glycerin, trichloropropane, etc.; the average solid content is 0.63%; the normal water temperature is 85°C; the pH value is about 13. Due to the large amount of alkali slag, Ca 2+ and OH - , if discharged directly, it will cause the COD value and PH value of the sewage to exceed the standard seriously, causing pollution to the water body and the atmosphere. Therefore, it must be treated to remove the lime milk slag and organic residues and adjust the pH value before it can be discharged. [0003] The processing method of sapo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52B01D21/01B01D21/26C02F1/66
Inventor 唐光斌梁晓年何茶生刘继军阳谦尚
Owner BALING PETRO CHEM CO LTD SINOPEC
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