剩余活性污泥和厨余垃圾续批式混合中温消化试验研究

Mesophilic co-digestion of waste activated sludge and kitchen garbage: batch study

将加碱水解和未水解剩余活性污泥与厨余垃圾混合后进行序批式中温厌氧消化,对生化产甲烷势(BMP)进行了测定。剩余活性污泥的水解通过添加NaOH进行,合理的NaOH投量为40mmol/L,在25℃和35℃下经过6h的水解后SCOD水解率分别提高27.4%和31.1%。厨余垃圾、25℃和35℃下水解污泥的最终甲烷产量分别为607、284、312mL/g(VS),两种水解污泥比未水解污泥分别高出43%、57.6%,水解污泥和厨余垃圾混合消化的可降解能力要优于未水解污泥和厨余垃圾的混合进料。

Biochemical methane potential （BMP） tests have been carried out to determine the anaerobic digestibility of the waste activated sludge （WAS）, the sludge pretreated by NaOH （PWAS）, and kitchen garbage. The optimal NaOH dosage was determined to be 40 mmol/L. The maximum COD solubilization was 27.4%和 31.1% at the temperatures of 20 ℃ and 35 ℃ respectively after 30 days. The final methane yield of kitchen garbage was 607 mL/g（VS）, and those of PWAS was 284 and 312 mL/g（VS） at the temperatures of 20 ℃ and 35 ℃, respectively. The figures were 43% and 57.6% higher than those of WAS. The anaerobic digestibility of the mixed feed of kitchen garbage and the PWAS is higher than that of the feed of kithen garbage with the WAS.