A method for the preparation of biodiesel by enhancing the microbial enrichment and lipid production of excess sludge
A technology for excess sludge and biodiesel, which is applied in the field of sludge recycling, can solve problems such as unsatisfactory efficiency, and achieve the effects of high added value and improved carbon source conversion rate.
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Embodiment 1
[0038] The invention discloses a method for preparing biodiesel by strengthening the enrichment and fat production of excess sludge microorganisms, the method comprising the following steps:
[0039] (1) Put the remaining sludge into the culture medium, add FeCl 3 Post-stirring fermentation: The influent of the sewage treatment plant is mainly domestic sewage, and some of it is industrial wastewater. The SBR process is adopted. The water quality indicators of the sewage treatment plant are as follows: COD cr =245.1mg / L, BOD 5 =86.1mg / L, SS=128.5mg / L, NH 3 -N=18.0 mg / L, COD / N=13.7, BOD / N=4.8, TP=2.22 mg / L, TN=30.0 mg / L. In the examples, after the sludge was sampled, it was sedimented and concentrated at 4°C for 24 hours and then the supernatant was removed. The MLVSS (Mixed Liquor Volatile Suspended Solids) of the sludge after sedimentation and concentration was about 20g / L. The initial MLVSS after inoculation into the fermentation medium is about 2.0-3.0g / L.
[0040] The f...
Embodiment 2
[0057] The method for preparing biodiesel by using the same method as in Example 1 to strengthen the enrichment of excess sludge microorganisms to produce fat, the difference is that the concentration of Fe in the culture medium before fermentation is 0.1mmol / L (as Fe 3+ count).
Embodiment 3
[0059] The method for preparing biodiesel by using the same method as in Example 1 to strengthen the enrichment of excess sludge microorganisms to produce fat, the difference is that the concentration of Fe in the culture medium before fermentation is 0.25mmol / L (as Fe 3+ count).
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