Harmless treatment method for excess sludge
A treatment method and technology for excess sludge, applied in biological sludge treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of low cost and large application potential
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[0032] The present invention has no special requirements for the cultivation method of the inoculated sludge containing bioleaching strains, and the method of enrichment and domestication well known to those skilled in the art can be adopted. In the present invention, the described bioleaching strains containing The preparation method of seed sludge preferably comprises the following steps:
[0033] The excess sludge and elemental sulfur are premixed, and a pre-biological leaching reaction is carried out to obtain the initial inoculum sludge;
[0034] Mixing the initial inoculation sludge, elemental sulfur and excess sludge, and performing a bioleaching reaction to obtain primary inoculation sludge;
[0035] The biological leaching reaction is carried out by circulating the once inoculated sludge until the inoculated sludge containing the biological leaching strains is obtained.
[0036] The invention premixes excess sludge and elemental sulfur, and performs prebiological lea...
Embodiment 1
[0051] Measure the remaining sludge (pH value is 5, solid content rate 2%) in the 0.2L sewage plant sludge storage tank in the Erlenmeyer flask, wherein the content of each heavy metal in the remaining sludge is as shown in Table 1; Add 5g / L of elemental sulfur powder, placed in a constant temperature shaking box with a temperature of 26°C and a rotation speed of 180r / min, measure the pH and ORP value of the remaining sludge every day, and wait until the pH of the remaining sludge is 500mV When, pipette 0.02L sludge and join in the fresh excess sludge according to 10% (v / v) ratio, and repeat above-mentioned steps 3 times to obtain the inoculation sludge containing bioleaching strain;
[0052] Table 1 Contents of heavy metals in the remaining sludge in the sludge storage tank of the sewage plant
[0053]
[0054] Get a cylindrical uncapped container (volume is 5L), add 3L of residual sludge (heavy metal Zn content is 883.17mg / kg, Cu content is 199.17mg / kg, Mn content is 391...
Embodiment 2
[0065] The preparation method of the inoculated sludge containing the biological leaching strain is the same as in Example 1;
[0066] Take a transparent cylindrical reactor (5L), add 3L of excess sludge (pH value is 8, solid content rate is 6%), ensure that the sludge solid content rate is 2%, and according to 10% (v / v) Proportionally add inoculated sludge (pH value 1.5) containing biological leaching strains, add 2g / L elemental sulfur powder, and aerate the sludge at the same time to ensure that the dissolved oxygen solubility is 3mg / L, and use a rotation speed of 100r The stirring paddle of / min keeps the sludge in a uniform mixing state, regularly supplements the water lost due to evaporation during the reaction process, and the reaction time is 7 days. The content of heavy metals in the sludge and the changes of sludge MLSS and MLVSS are measured. The test results are as follows: Table 2 and Table 3 are shown.
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Abstract
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