Landfill leachate sludge dewatering composite biological enzyme conditioner as well as preparation method and use method thereof

A composite biological enzyme, sludge dewatering technology, applied in water/sludge/sewage treatment, sludge treatment, polluted groundwater/leachate treatment, etc. , the difficulty of deep dewatering of landfill leachate sludge, etc., to achieve the effect of increasing the dryness of the sludge and increasing the filtration speed.

Pending Publication Date: 2022-02-11
苏州埃斯腾特生物科技有限公司
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, by adding flocculants, taking measures to increase dehydration pressure, ensure dehydration time, avoid rewetting, and reduce dehydration resistance, it is possible to use mechanical methods to filter primary sludge and blow off sludge from landfill leachate. The water content of the cake is less than 50%, but this method is aimed at the landfill leachate biochemical sludge and advanced treatment sludge, the water content of the filter cake can only reach less than 60%, this is because the landfill leachate biochemical sludge, The presence of microbial extracellular polymers in advanced treatment sludge seriously affects the deep dehydration of landfill leachate sludge. Microbial extracellular polymers are organic polymer mixtures with extremely high water content produced by microorganisms. The surface of the fine fibers and bacterial micelles in the leachate sludge is easy to adsorb the transition metal ions and anion garbage in the landfill leachate sludge, which not only makes it difficult to remove the moisture inside the microorganisms and themselves, but also hinders the removal of water in the sludge. The migration of free water makes the deep dehydration of landfill leachate sludge extremely difficult. Therefore, how to select a suitable landfill leachate sludge conditioning technology to make a large change in the structure, composition and distribution of microbial extracellular polymers in sludge, Improving sludge dewatering performance is a key issue to be solved when developing new landfill leachate sludge dewatering technology

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  • Landfill leachate sludge dewatering composite biological enzyme conditioner as well as preparation method and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Weigh the leachate sludge sample to be conditioned at 10m 3 In the plastic bucket, the sludge is taken from before entering the sludge thickening tank, add a certain amount of sludge conditioner, and stir continuously for 90-150 minutes under the condition of 30-50°C, and the stirring speed is 60-80 rpm. Then add a PAM solution with a concentration of 0.1% and continue to stir for 45-60 minutes. After precipitation, use laboratory filter press equipment to squeeze, the pressure is controlled at 0.5MPa, press filter for 5 minutes, and use 5000g of aqueous sludge for each experiment. The experimental results As shown in Table 1 below:

[0041] Table 1: Dryness of leachable sludge after adding sludge conditioner

[0042] serial number formula Conditioning agent ratio (%) PAM ratio (%) Dryness of sludge after press filtration (%) blank 0.5 34 1 A 0.005 0.5 46 2 B 0.005 0.5 47 3 C 0.005 0.5 47 4 A 0.01 0.5 52 ...

Embodiment 2

[0045] The leachate of a waste-to-energy plant supporting a mega city is treated by primary settling, air blowing, anaerobic digestion, aerobic biochemistry, and Fenton, and the sludge before entering the sludge concentration tank is treated at a rate of 0.01%. Add sludge conditioner in proportion, stir continuously for 90-150 minutes at 30-50°C, and stir at a speed of 60-80 rpm, then add PAM solution with a concentration of 0.1% at a ratio of 0.5% and stir continuously for 45-60 minutes , enter the sludge thickening tank after sedimentation, and then filter through the sludge filter press for 5 minutes. The experimental results are shown in Table 2 below:

[0046] Table 2: Dryness of leachable sludge after adding sludge conditioner

[0047] serial number formula Conditioning agent ratio (%) PAM ratio (%) Dryness of sludge after press filtration (%) blank 0.5 37 1 A 0.01 0.5 62 2 B 0.01 0.5 61 3 C 0.01 0.5 59

[0048] T...

Embodiment 3

[0050] The leachate of a waste-to-energy plant in a medium-sized city is subjected to primary settling, blown off, anaerobic digestion, aerobic biochemistry, and Fenton treatment, and the sludge before entering the sludge thickening tank is added at a ratio of 0.01%. Sludge conditioner, stir continuously for 90-150 minutes at 30-50°C, at a stirring speed of 60-80 rpm, then add 0.1% PAM solution in a proportion of 0.5% and continue stirring for 45-60 minutes, and precipitate Then enter the sludge thickening tank, and then filter through the sludge filter press for 5 minutes. The experimental results are shown in Table 3 below:

[0051] Table 3: Dryness of leachable sludge after adding sludge conditioner

[0052] serial number formula Conditioning agent ratio (%) PAM ratio (%) Dryness of sludge after press filtration (%) blank 0.5 38 1 A 0.01 0.5 62 2 B 0.01 0.5 63 3 C 0.01 0.5 62

[0053] The results in the above table s...

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Abstract

The invention relates to a landfill leachate sludge dewatering composite biological enzyme conditioner as well as a preparation method and a use method thereof. The conditioner comprises the following components in percentage by mass: 10-15% of cellulase; 5-8% of xylanase; 3-5% of laccase; 8-10% of pectinase; 12-18% of protease; 5-8% of chitosanase; 5-10% of lipase; 8-12% of fatty acid sorbitan; 10-15% of hexadecyl trimethyl bromide; 2-5% of sodium chloride; 1-3% of potassium sorbate; and 3-20% of deionized water. The components can be used for dewatering landfill leachate sludge after being mixed, extracellular polymeric substances in the sludge are extracted and damaged by the aid of the enzyme and the surfactant, so that water bound to the sludge is reduced, meanwhile, colloids and fine fibers in the sludge are modified and degraded by the conditioner, the filtering speed of water in the sludge is increased. The treated sludge is flocculated through a flocculating agent PAM, and finally, the dryness of the leachate sludge can be greatly improved through filter pressing and dewatering treatment, the dryness of the sludge after filter pressing can reach 55-65%, and the sludge can be directly incinerated together with garbage.

Description

technical field [0001] The invention relates to a biological enzyme preparation, in particular to a leachate sludge dehydration composite biological enzyme conditioner and a use method thereof. Background technique [0002] Leachate sludge is the terminal product discharged after leachate wastewater treatment in waste-to-energy plants, including primary sludge, biochemical sludge, blow-off sludge, and advanced treatment sludge. So far, the methods of leachate sludge disposal mainly include sea discharge, landfill, agricultural use and incineration. The premise of sludge composting, incineration or other resource utilization is to dehydrate the sludge to a certain degree of dryness. At present, there are many methods for dehydrating leachate sludge at home and abroad, including dry dehydration and mechanical dehydration. The energy consumption and comprehensive operation cost of dry dehydration are relatively high, and the mechanical method can make the sludge dryness meet t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148C02F11/147C02F11/122
CPCC02F11/122C02F11/147C02F11/148C02F2103/06
Inventor 孙新富武运佐
Owner 苏州埃斯腾特生物科技有限公司
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