Method for biologically drying sludge by using rice hull as additive

A technology of biological drying and additives, applied in biological sludge treatment and other directions, to achieve the effect of uniform mixing, stable operation and high efficiency

Pending Publication Date: 2018-09-14
SHENYANG ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves making use of rice hulls (a type of plant fiber) instead of traditional materials like crop residue or lignocellulosic fibers used in paper production processes. By utilizing this new source of raw material, these techniques are more effective than other sources while also being easier to dispose of due to their dispersibility, consistency, ease of collectance, shipping convenience, and storagage space requirements compared to existing methods that require high temperatures during processing. Additionally, because they have better properties when mixed together, there're less chance of recombined seams after long periods of usage. Overall, this innovative approach provides an environmentally friendly solution for producing useful products from rice hulks without causing environmental concerns over conventional ways of treating them.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to use rice hulls (a type of plant fiber) instead or mix them into other products that have better properties than regular synthetic fibers like polypropylene terephthalate).

Method used

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  • Method for biologically drying sludge by using rice hull as additive
  • Method for biologically drying sludge by using rice hull as additive
  • Method for biologically drying sludge by using rice hull as additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Rice husk is used as a co-matrix auxiliary material to participate in the evaluation of the biological drying effect.

[0029] This experiment was divided into three groups, the first group was corn stalk as co-substrate; the second group was corn stalk + rice husk as co-substrate, the mass ratio was 1:1; the third group was rice husk as co-substrate. The material ratio (sludge: co-substrate: backmixing material) is 1:0.01:1.2, and the aeration control parameters are 2min / h for section A; 5min / h for section B; 15min / h for section C; 15min / h for section D; E section 15min / h; F section 10min / h. Record the initial moisture content, and ferment for 22 days after fully mixing, record the discharge moisture content, the results are shown in Table 1:

[0030]

[0031] The experimental results in Table 1 show that the average moisture content of the sludge in the third group when the rice husk is used as the co-matrix is ​​47.47 ± 6.07%, which is slightly ...

Embodiment 2

[0032] Example 2: Evaluation of the effect of different material ratios on biological drying.

[0033] This experiment was divided into 5 groups, and the ratio of sludge, rice husk, and back-mixed materials from the first group to the fifth group was set as 1: 0.048: 0.89, 1: 0.048: 1.1, 1: 0.09: 1.93, 1:0.12:0.88, 1:0.15:0.65, the initial moisture content of the mixture from the first group to the fifth group was 56.76%, 57.14%, 64.37%, 59.95%, 55.84%, the exposure of the six fermentation stages Gas control parameters are 2min / h for section A; 5min / h for section B; 5min / h for section C; 15min / h for section D; 15min / h for section E; 10min / h for section F.

[0034] The experimental results show that further reducing the addition of rice husk (1:0.048) is not conducive to the fermentation process, and the moisture content is 39.15±2.5 and 39.28±1.6 respectively. When it reaches 1:0.88~1:0.65, the fermentation effect is ideal, the average moisture content is about 36%, and the c...

Embodiment 3

[0035] Example 3: Evaluation of the effect of aeration parameter control on sludge biological drying.

[0036] Control the ratio of sludge, rice husk, and back-mixed materials to 1:0.15:0.6, and turn over once a day. The first group is the aeration parameters before optimization, and the second group is the aeration parameters after optimization. The aeration parameters are set as shown in Table 2:

[0037] Aeration time

[0038]By measuring the moisture content (%) of the output material, the results show that the moisture content of the output material is 34.37 ± 1.84% with optimized aeration parameters, which is significantly lower than the 39.97 ± 2.24% of the aeration parameters before optimization. Therefore, the optimized aeration parameters have It is beneficial to the rapid progress of the biological drying process. Compared with the parameters before optimization, the microbial activity in the heating stage of section A is higher. At this stage, oxygen sup...

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Abstract

The invention discloses a method for biologically drying sludge by using rice hull as an additive. The method comprises the following steps: S1, conveying the rice hull, sludge and a return mixed material; S2, mixing the rice hull, the sludge and the return mixed material; S3, conveying the obtained mixed material to the front end of a fermentation tunnel trough by means of a belt conveyor, and unloading the mixed material at the front end of the fermentation tunnel trough; S4, after the mixed material enters a fermentation section, turning over the fermented material by using a pile overturning machine; S5, after fermentation is carried out for 21-22 days, conveying the fermented material to a clinker chamber by means of the belt conveyor from the fermentation section F of the fermentation tunnel trough so as to obtain the dried sludge product. The method adopts the rice hull as biomass for co-substrate fermentation; the rice hull is good in dispersing degree, uniform in mixing, recyclable, convenient to collect and transport and easy to store, thus being suitable for large-scale concentrated sludge treatment; the method can be used for rapidly and efficiently biologically dryingthe sludge, and the sludge drying process is enabled to be efficiently and stably carried out.

Description

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Claims

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Application Information

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Owner SHENYANG ACAD OF ENVIRONMENTAL SCI
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