Technologies for reducing sludge production in wastewater treatment plants: State of the art

Wang, Qilin; Wei, Wei; Gong, Yanyan; Qian, Yu; Q, Li; Sun, Jing; Yuan, Zhiguo

doi:10.1016/j.scitotenv.2017.02.203

Cited by 146 publications

(124 citation statements)

References 145 publications

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“…Activated bacterial sludge processes in stirred ponds are the most widely used WWT technologies, especially for municipal and industrial wastewater. However, as introduced, activated sludge is limited regarding the sufficient N and P removal or elimination of heavy metals without using chemical precipitation . The usage of microalgae in WWT is associated with additional technological requirements regarding photobioreactor (PBR) systems.…”

Section: (Photo‐)bioreactor Systems For Algae‐based Wwtmentioning

confidence: 99%

Microalgae wastewater treatment: Biological and technological approaches

Wollmann

Dietze

Ackermann

et al. 2019

Engineering in Life Sciences

262

108

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Current global environmental issues raise unavoidable challenges for our use of natural resources. Supplying the human population with clean water is becoming a global problem. Numerous organic and inorganic impurities in municipal, industrial, and agricultural waters, ranging from microplastics to high nutrient loads and heavy metals, endanger our nutrition and health. The development of efficient wastewater treatment technologies and circular economic approaches is thus becoming increasingly important. The biomass production of microalgae using industrial wastewater offers the possibility of recycling industrial residues to create new sources of raw materials for energy and material use. This review discusses algae‐based wastewater treatment technologies with a special focus on industrial wastewater sources, the potential of non‐conventional extremophilic (thermophilic, acidophilic, and psychrophilic) microalgae, and industrial algae‐wastewater treatment concepts that have already been put into practice.

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Section: (Photo‐)bioreactor Systems For Algae‐based Wwtmentioning

confidence: 99%

Microalgae wastewater treatment: Biological and technological approaches

Wollmann

Dietze

Ackermann

et al. 2019

Engineering in Life Sciences

262

108

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“…Currently, activated sludge (residual product of the biological section of wastewater treatment) is being investigated as alternative feedstock, due to availability and suspected high lipid contents (Edeh, ; Huynh, Nguyen, Ho, & Ju, ). Although, it can be used to produce bioenergy from gasification, incineration, combustion, and anaerobic digestion, the process usually involves emission of toxic substances (like in gasification and incineration) or high capital and operational cost or is limited by being constrained to laboratory scale applications as in anaerobic digestion (Monnet, ; Şahinkaya & Sevimli, ; Wang et al, ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the efficacy of subcritical water to enhance the lipid fraction from activated sludge for biodiesel and oleochemicals production

Edeh

Overton

Bowra

2019

J Food Process Engineering

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Activated sludge is currently being investigated as a potential feedstock to produce biodiesel. Reports have shown that its lipid yield is usually low, compared to the commercially available feedstocks, such as soybean, sunflower, and rapeseed oils. The current work is geared toward investigating the potential of enhancing the total lipid yield (neutral and phospholipid) by the application of subcritical water. The results show that subcritical water treatment increased the total lipid yield by 145% at the optimum conditions 280°C, 40 min, 15 mL of water and biomass loading of 5%. The lipid classes identified were waxes, acylglycerol, sterol, free fatty acid, and phospholipids. The results of the fatty acid methyl esters analysis revealed palmitic acid as the predominant fatty acid. Practical applications The practical applications of the results are informed from the improved lipid yield obtained, suggesting that subcritical water treatment is essential if activated sludge were to be a viable feedstock for biodiesel, renewable diesel, and oleochemicals productions. This will serve as a sustainable activated sludge disposal strategy.

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“…The utilization of biological methods in wastewater treatment has been a dominant technology worldwide for some time now [1]. Despite its effectiveness in removing organic compounds, the biological aerobic wastewater treatment process's main drawbacks are the large amounts of generated excess sludge and the costs of disposing it [1].…”

Section: Introductionmentioning

confidence: 99%

“…Despite its effectiveness in removing organic compounds, the biological aerobic wastewater treatment process's main drawbacks are the large amounts of generated excess sludge and the costs of disposing it [1]. According to the report for the European Commission [2] the amount of sludge generated in the EU countries will reach 13,047,000 Mg TS by the year 2020.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Excess Sludge Ultrasonic, Mechanical and Hybrid Pretreatment in Relation to the Energy Parameters

Skórkowski

Zielewicz

Kawczyński

et al. 2018

Water

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Anaerobic digestion is the most common stabilization process at large sewage treatment plants. To improve its effects, a sludge pre-conditioning process called disintegration is recommended. The aim of the presented study was to compare the direct effects of various types of mechanical disintegration, performed for the same excess sludge, in relation to the energy parameters and effectiveness of the process. Four different disintegration methods were used: mechanical disintegration in semi-technical and laboratory scale homogenizing mixers, ultrasonic disintegration (US) and combined (hybrid) process. The disintegration was performed for volumetric energy E V = 4.67-100 kWh m −3 , the results were evaluated based on dispersion (kd COD , kd CST ), lysis (kd SCOD ), acidification (kd VFA ) and nutrient release (kd TN , kd TP ) disintegration indicators. The statistical analysis of the results indicates the influence of disintegrator type (mixer/US/hybrid), scale (laboratory/semi-technical) and energy input on the direct results of disintegration. Hybrid disintegration delivered better direct results than two pre-treatment processes used separately. The efficiency of the hybrid process defined as the increase of the indicator (disintegration products-∆FCOD, ∆SCOD) per unit of energy was considerably higher than for a single stage disintegration process.

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Technologies for reducing sludge production in wastewater treatment plants: State of the art

Cited by 146 publications

References 145 publications

Microalgae wastewater treatment: Biological and technological approaches

Microalgae wastewater treatment: Biological and technological approaches

Evaluation of the efficacy of subcritical water to enhance the lipid fraction from activated sludge for biodiesel and oleochemicals production

Assessment of Excess Sludge Ultrasonic, Mechanical and Hybrid Pretreatment in Relation to the Energy Parameters

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