Sludge reduction by a micro-aerobic hydrolysis process: A full-scale application and sludge reduction mechanisms

2018 ◽  
Vol 268 ◽  
pp. 684-691 ◽  
Author(s):  
Lu-Man Jiang ◽  
Zhen Zhou ◽  
Cheng Cheng ◽  
Jinmin Li ◽  
Chao Huang ◽  
...  
Keyword(s):  
Full Scale ◽  
Sludge Reduction ◽  
Hydrolysis Process ◽  
Reduction Mechanisms

Evaluation of Sludge Reduction Mechanisms in ‘Sonolysis-Cryptic Growth’ Wastewater Treatment System

2015 ◽  
Vol 768 ◽  
pp. 108-115
Author(s):  
Pan Yue Zhang ◽  
Tian Wan ◽  
Guang Ming Zhang
Keyword(s):  
Wastewater Treatment ◽  
Organic Load ◽  
Sludge Reduction ◽  
Excess Sludge ◽  
Operation Condition ◽  
Reduction Mechanisms ◽  
Residual Sludge ◽  
Cryptic Growth ◽  
Load Increase

‘Sonication - cryptic growth’ technology can reduce 30-80% excess sludge in wastewater treatment systems. Various mechanisms contribute to the sludge reduction but the role of each one is unclear. This paper quantitatively studied the potential mechanisms in ‘sonication - cryptic growth’. The operation condition was: every day 20% sludge was sonicated under 1.2 Wml-1 for 15 min and then returned to the wastewater treatment reactor for cryptic growth. The results showed that under such conditions, ‘sonication - cryptic growth’ reduced the excess sludge by 57.3% and the effluent met the national discharge standard. Multiple mechanisms were involved in the process. Detailed analysis showed that the ‘lysis-cryptic growth’ mechanism was the most important one and accounted for 49.1% of sludge reduction. Biodegradation of residual sludge was the second important one and contributed 19.5%. Other potential mechanisms included the altered microbial community, longer sludge retention time, and accumulation of persistent materials. But organic load increase had virtually no impact.

scholarly journals The effects of a full-scale anaerobic side-stream reactor on sludge decay and biomass activity

2019 ◽  
Vol 79 (6) ◽  
pp. 1081-1091 ◽  
Author(s):  
V. F. Velho ◽  
G. Andreottola ◽  
P. Foladori ◽  
R. H. R. Costa
Keyword(s):  
Activated Sludge ◽  
Mass Balance ◽  
Oxygen Demand ◽  
Full Scale ◽  
Sludge Reduction ◽  
Solid Mass ◽  
Anaerobic Conditions ◽  
Side Stream ◽  
Biomass Activity ◽  
Heterotrophic Biomass

Abstract A full-scale anaerobic side-stream reactor (ASSR) for sludge reduction was monitored in terms of sludge production and compared with the previous conventional activated sludge configuration (CAS). A detailed solid mass balance was calculated on the whole full-scale plant to estimate the sludge reduction associated with the ASSR. The activity of the biomass, which undergoes alternation of aerobic and anaerobic conditions, was investigated by the respirometric test. The ASSR promoted a reduction of heterotrophic biomass activity and the substrate consumption rate in the activated sludge implemented with ASSR (AS + ASSR) was 36% smaller than in the CAS period. The solid mass balance indicated a sludge reduction of 28%. During the 270-day operation, the observed sludge yield passed from 0.438 kgTSS/kgCOD in the CAS to 0.315 in the AS + ASSR configuration. The solubilization of chemical oxygen demand (COD), NH4+-N and orthophosphate were verified under anaerobic conditions. The results suggest that the possible mechanisms of sludge reduction were the increase of the system sludge retention time (SRT) by ASSR addition, and the reduction in heterotrophic biomass activity added to the organic compounds' hydrolysis.

Simultaneous sludge reduction and nutrient removal (SSRNR) with interaction between Tubificidae and microorganisms: A full-scale study

2011 ◽  
Vol 102 (24) ◽  
pp. 11132-11136 ◽  
Author(s):  
Juqing Lou ◽  
Peide Sun ◽  
Maoxin Guo ◽  
Ge Wu ◽  
Yingqi Song
Keyword(s):  
Nutrient Removal ◽  
Full Scale ◽  
Sludge Reduction

The investigation of the sludge reduction efficiency and mechanisms in oxic–settling–anaerobic (OSA) process

2016 ◽  
Vol 73 (10) ◽  
pp. 2311-2323 ◽  
Author(s):  
Özlem Demir ◽  
Ayşe Filibeli
Keyword(s):  
Control System ◽  
Volume Index ◽  
Endogenous Respiration ◽  
Sludge Reduction ◽  
Capillary Suction ◽  
Term Operation ◽  
Effluent Quality ◽  
Conventional Activated Sludge ◽  
Reduction Mechanisms

This paper aims to provide a full understanding of the sludge reduction mechanisms in the oxic–settling–anaerobic (OSA) process and presents an evaluation of the sludge reduction efficiencies and sludge characteristics in this process compared to the conventional activated sludge process. Fifty-eight percent reduction in observed yield in the OSA process was achieved compared to the control system at the end of the operational period with no deterioration of effluent quality. The settleability of sludge in the OSA process was also found to be better than that of the control system in terms of sludge volume index. In long-term operation, capillary suction time and specific resistance to filtration values confirmed that the OSA process showed good filterability characteristics. The results of batch experiments showed that higher endogenous respiration in the systems might lead to lower sludge production and that energy uncoupling had only a limited impact on sludge reduction.

scholarly journals Effects of post anaerobic digestion thermal hydrolysis on dewaterability and moisture distribution in digestates

2019 ◽  
Vol 80 (7) ◽  
pp. 1338-1346 ◽  
Author(s):  
Oda K. Svennevik ◽  
Odd Egil Solheim ◽  
Greeley Beck ◽  
Geir H. Sørland ◽  
Kjell R. Jonassen ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Raw Materials ◽  
Free Water ◽  
Full Scale ◽  
Moisture Distribution ◽  
Thermal Hydrolysis ◽  
Water Fraction ◽  
Solids Concentration ◽  
Hydrolysis Process ◽  
The Impact

Abstract Organic waste fractions such as sewage sludge, food waste and manure can be stabilized by anaerobic digestion (AD) to produce renewable energy in the form of biogas. Following AD, the digested solid fraction (digestate) is usually dewatered to reduce the volume before transportation. Post-AD treatments such as the Post-AD thermal hydrolysis process (Post-AD THP) have been developed to improve the dewatering, but the mode of action is not well understood. In this study, samples from 32 commercial full-scale plants were used to assess the impact of Post-AD THP on a broad range of raw materials. Maximum dewatered cake solids after Post-AD THP was predicted by thermogravimetric analysis (TGA). Post-AD THP changed the moisture distribution of the samples by increasing the free water fraction. A consistent improvement in predicted dewatered cake solids was achieved across the 32 samples tested, on average increasing the dry solids concentration by 87%. A full-scale trial showed that dewatering Post-AD THP digestate at 80 °C improved dewatered cake solids above the predictions by TGA at 35 °C. In conclusion, dewatered cake solids were significantly improved by Post-AD THP, reducing the volume of dewatered cake for disposal.

Sludge Reduction through Ozonation: Effects of Different Specific Dosages and Operative Management Aspects in a Full-Scale Study

2015 ◽  
Vol 141 (12) ◽  
pp. 04015043 ◽  
Author(s):  
P. Romero ◽  
M. D. Coello ◽  
C. A. Aragón ◽  
P. Battistoni ◽  
A. L. Eusebi
Keyword(s):  
Operative Management ◽  
Full Scale ◽  
Sludge Reduction
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