Synergistic anaerobic treatment method of thermal alkali pretreatment of municipal sludge and kitchen waste
A technology of thermal alkali pretreatment and municipal sludge, which is applied in the direction of biomass pretreatment, biological sludge treatment, biomass post-treatment, etc., can solve the problems of reducing inhibition effect, low gas production efficiency, and many inhibitory factors, and achieves The effect of reducing inhibition effect, increasing methane production, and broad application prospects
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Embodiment 1
[0029] The characteristics of the municipal sludge in the thermal alkali pretreatment stage of the present invention are shown in Table 1-1.
[0030] Table 1-1 Basic characteristics of experimental sludge
[0031]
[0032] Single factor experiment: Control the reaction pH to 10, the time is 40min, and the temperature gradient is 50°C, 60°C, 70°C, 80°C, 90°C to study the effect of different temperatures on the effect of sludge cracking; under the optimal temperature conditions, Adjust the pH to 10, set the reaction time to 40, 60, 80, 100, and 120 minutes, and obtain the optimal reaction time; under the conditions of optimal treatment temperature and reaction time, adjust the pH value to 8, 9, 10, 11, 12, research to get the optimal pH value. Add about 100mL of sludge into 250mL Erlenmeyer flasks, add 4mol / L KOH solution to adjust the pH to the experimental set value, and then place them in a water bath constant temperature oscillator for anaerobic digestion. The results o...
Embodiment 2
[0042] The characteristics of municipal sludge, kitchen waste and inoculation sludge in the two-phase anaerobic digestion acid production stage of the present invention are shown in Table 1-3.
[0043] Table 1-3 Basic physical and chemical properties of matrix
[0044]
[0045] Before carrying out two-phase anaerobic digestion, adopt the optimal process condition that embodiment 1 draws to carry out thermal alkali pretreatment to municipal sludge, specific implementation conditions are as follows: add the municipal sludge of about 2L in 2.5L beaker, use 4mol / L KOH solution to adjust the pH to 12 and place it in a 90°C water bath constant temperature oscillator for pretreatment. During the treatment process, stir for 5 minutes every half hour. After the pretreatment, take it out and cool it to room temperature for use.
[0046] Next, a 1L Erlenmeyer flask was used for batch anaerobic digestion experiments, and the TS percentages of food waste were added at 0%, 20%, 40%, 60%...
Embodiment 3
[0054] The characteristics of the municipal sludge, kitchen waste and inoculum sludge when studying the effect of residence time on two-phase anaerobic digestion in this example are shown in Tables 1-4.
[0055] Table 1-4 Basic physical and chemical properties of materials
[0056]
[0057] The sludge and kitchen waste after thermal alkali pretreatment were mixed according to the TS ratio of 2:3 and then used as the fermentation substrate of the acid-producing phase reactor. A 1L Erlenmeyer flask was used as the anaerobic digestion tank, respectively numbered T2, T3, T4, T5, T6, the hydraulic retention time is 2d, 3d, 4d, 5d, 6d respectively, the substrate concentration is 50g / L (calculated as TS), and the mixed material and acid-producing inoculation sludge are carried out according to the TS ratio of 1:1. Inoculate, add distilled water to make the volume to 500mL, use 1mol / L HCL solution to adjust the pH to 6, purge with nitrogen gas for 2min, seal with a rubber stopper a...
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