Method for pretreating residual activated sludge of refinery plant by using alkaline residues
A residual activity, pretreatment technology, applied in sludge treatment, biological sludge treatment, chemical instruments and methods, etc., can solve the problems of limiting the application of sludge pretreatment technology, high equipment investment, operating costs and reagent costs, etc. To achieve the effect of collaborative processing, improve processing effect and reduce pretreatment cost
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Embodiment 1
[0036] The processing method of the refinery surplus activated sludge provided by the present embodiment comprises the following steps:
[0037] Step 1. Send the surplus activated sludge from the refinery into the secondary settling tank for natural sedimentation and concentration. The water content of the concentrated refinery surplus activated sludge is 95.8%, and the SCOD concentration in the supernatant is 87.5mg / L. Sludge VS is 18550mg / L;
[0038] Step 2, the pH value of the residual activated sludge of the refinery after measuring concentration is 7.5, each gets the residual activated sludge of the refinery after 1L of concentration, adds the NaOH solution of alkali slag (pH value is 13.5) and 3mol / L respectively to make The pH value of the mixed system of the concentrated refinery residual activated sludge and lye is 12, and it is stirred at room temperature at a speed of 300 rpm for 1 hour, and a blank group is set at the same time, that is, the concentrated refinery a...
Embodiment 2
[0045] This example mainly explores the influence of the dosage of alkali slag and pretreatment time on anaerobic digestion during the pretreatment process, and optimizes the pretreatment conditions of alkali slag:
[0046] Step 1. Send the surplus activated sludge from the refinery to the secondary settling tank for natural sedimentation and concentration. The water content of the concentrated refinery surplus activated sludge is 95.8%, the VS is 18550mg / L, and the COD concentration in the supernatant is 87.5mg / L;
[0047] Step 2, the pH value of the residual activated sludge of the refinery after measuring the concentration is 7.5, respectively get the residual activated sludge of the refinery after 1L of concentration, add alkali slag 10, 10, 20, 30, 40 and 50mL, stir quickly and evenly, and measure the pH values of the mixed system of the refinery residual activated sludge and alkali slag after concentration in each group are: 10.0, 11.1, 12.1, 12.5 and 12.7, without adj...
Embodiment 3
[0054] This embodiment provides mainly to explore the impact of temperature on anaerobic digestion in the pretreatment process:
[0055] Step 1. Send the surplus activated sludge from the refinery into the secondary settling tank for natural sedimentation and concentration. The water content of the concentrated refinery surplus activated sludge is 95.6%, and the COD concentration in the supernatant is 88.3mg / L;
[0056] Step 2. Measure the pH value of the remaining activated sludge in the refinery to 7.2, take 1L of the remaining activated sludge in the refinery, add 30mL of alkali residue and stir quickly, and measure the concentrated activated sludge and alkali residue in the refinery The pH value of the mixed system is 12.3, and the mixed system is placed in a water bath at 80°C, and stirred at a speed of 300rpm for 2h with a stirrer;
[0057] Step 3, using 1 mol / L hydrochloric acid solution to adjust the pH value to the range of 7-7.5 to terminate the pretreatment reaction...
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