首页|低热-NaOH联合处理破解浓缩活性污泥释放碳源的试验研究

低热-NaOH联合处理破解浓缩活性污泥释放碳源的试验研究

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以低热-NaOH联合处理破解剩余活性污泥,考察NaOH投加量、加热温度、反应时间对污泥破解释放碳源的影响,通过总氮去除率分析污泥破解液代替生物脱氮外加碳源的效率,并研究该方法对污泥减量化的效果.结果表明:SCOD溶出率随NaOH投加量、加热温度和反应时间的增加而增大;当NaOH投加量为3.0 g/L、加热温度为70 ℃、反应时间为24 h时剩余活性污泥的破解效果最佳,污泥上清液中SCOD浓度可达1.829× 104mg/L,总氮、氨氮、硝酸盐氮和总磷浓度分别达到943、419、487、204 mg/L;污泥破解前后固体残渣中TSS含量由61.70 g/L下降至29.25 g/L,VSS含量由31.95 g/L下降至6.95 g/L,生物减量化效果非常显著;污泥破解前后中值粒度D50分别为30.2、8.7μm,污泥破解过程中产生了大量的粒径为0.15μm左右的超细颗粒;扫描电镜结果显示污泥絮体和微生物细胞被破坏;在反硝化试验中,以最佳破解条件下释放的污泥破解液作为反硝化试验的补充碳源,结果显示COD利用率为83.4%,总氮的去除率为60.1%,脱氮的效果显著.低热-NaOH联合处理可在较低能耗下实现剩余活性污泥的碳源充分释放,且污泥减量化和资源化的效果优异,可为优化热碱法预处理剩余活性污泥提供依据.
Experimental study on low heat-NaOH combined treatment for the release of carbon source from cracked concentrated activated sludge
This study investigated the cracking of residual activated sludge using a low heat NaOH combined treatment method.The effects of NaOH dosage,heating temperature and reaction time on the carbon source released from sludge cracking were studied,and the efficiency of using sludge cracking solution as a re-placement for biological nitrogen removal and carbon source was evaluated by analyzing the total nitrogen removal rate.The effect of this method on the sludge reduction was also examined.The results show that the dissolution rate of SCOD increases with increasing NaOH dosage,heating temperature,and reaction time;the best cracking effect is achieved with a NaOH dosage of 3.0 g/L,heating temperature of 70 ℃,and the reaction time is 24 hours,where the SCOD concentration of the sludge supernatant reaches 1.829× 104 mg/L,and total nitrogen,ammonia nitrogen,nitrate nitrogen,and total phosphorus concentration reaches 943,419,487,and 204 mg/L,respectively.The sludge reduction effect is significant with a decrease in TSS content from 61.70 g/L to 29.25 g/L,and VSS content from 31.95 g/L to 6.95 g/L.The biological reduc-tion effect before and after sludge cracking is very significant;the median diameter size is 30.2 μm and 8.7μm,respectively before and after sludge disintegration and a large number of ultrafine particles with a size of around 0.15 μm were generated.SEM results show that sludge flocs and microbial cells are destroyed.In the denitrification experiment,the sludge cracking solution under the best conditions was used as a supple-mentary carbon source,resulting in a COD utilization ratio of 83.4%and a total nitrogen removal ratio of 60.1%,indicating that the nitrogen removal effect was significant.This study demonstrates the potential of using the low heat NaOH combined method for sludge cracking and reduction,and as a replacement for bio-logical nitrogen removal and the carbon source.The sludge reduction and resource utilization are excellent,which can provide a basis for optimizing the thermal alkali pretreatment of residual activated sludge.

low heat-NaOH combined treatmentactivated sludgerelease carbon sourcereductionresource utilizationdenitrification experiment

马雪雨、唐玉朝、蔡丽丽、伍昌年、薛莉娉、黄显怀、刘俊、宋永莲

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安徽建筑大学环境污染控制与废弃物资源化利用安徽省重点实验室,安徽 合肥 230601

安徽中环环保科技股份有限公司,安徽 合肥 230071

低热-NaOH联合处理 活性污泥 释放碳源 减量化 资源化 反硝化试验

国家自然科学基金项目安徽省自然科学基金项目

519780032208085US20

2024

安全与环境工程
中国地质大学

安全与环境工程

CSTPCD北大核心
影响因子:1.03
ISSN:1671-1556
年,卷(期):2024.31(1)
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