2020/1/1/ · Sewage sludge is the by-product during biological wastewater treatment process and usually accounts for 1%–2% of the treated wastewater volume. In recent years, the production of sewage sludge has been increasing year by year, and for example, reached about 6.5, 3.0, and 2.0 million tons dry solids annually in American, China, and
Electro-fermentation (EF) was combined with anaerobic fermentation (AF) to promote medium-chain fatty acid (MCFA) from sewage sludge. Results showed that EF at
2019/7/17/ · Abstract The high volumes of sewage sludge produced have raised interests for simultaneous treatment and clean energy production, e.g. in the form of hydrogen. Pretreatment of sewage sludge is required to enhance microbial degradation and in turn hydrogen yield from sewage sludge. The potential of five substrate pretreatments,
2023/8/21/ · Polyaluminum chloride (PAC) is used widely and increasingly in wastewater treatment plants, resulting in its inevitably high production in sludge. Previous studies have indicated that the production of short-chain fatty acids (SCFAs) is inhibited by the existence of PAC in sludge anaerobic fermentation, so it is necessary to study how
2023/5/15/ · Compared with the removal of ammonia nitrogen and phosphorus, extracting SCFAs directly from the sludge fermentation solution and then injecting them into the anoxic tank as a carbon source can not only reduce the nitrogen and phosphorus load of the mainstream wastewater, but also make the carbon injection more accurate
2023/12/1/ · A sedimentation tank with a working volume of approximately 6 m 3 was connected to the CSTR for sludge sedimentation, and the bottom sludge was returned to the CSTR through a submersible sewage pump. Each cycle of the NF-SBR lasted for 8 h and consisted of 5 periods: 40 min feeding, 1–3 h aeration, 40 min settling, 40 min
2014/10/1/ · In recent years, the recovery of VFA from the biological treatment of wastewater, sewage sludge, food and fermentation waste and lignocellulosic waste biomass through dark fermentation and
2021/4/1/ · 1. Introduction. Waste activated sludge (WAS) is an important by-product of biological treatment processes [1], WAS disposal generally accounts for 50 %–60 % of the total construction and operation costs of a wastewater treatment plant [2, 3].WAS contains elements such as N, P, K and rich organic matter, which can be used as a resource [4].In
2022/9/5/ · 3 Research status of organic wastewater fermentation hydrogen production process. Existing studies have studied hydrogen production in a variety of reactors, among which the most studied include (de Menezes and Silva, 2019) Continuous flow Stirred Tank Reactor (CSTR), Upflow Anaerobic Sludge Bed (UASB), Anaerobic
2018/7/1/ · Section snippets Outline of the full-scale sludge fermentation engineering. The full-scale work included the following four parts as shown in Fig. 1, sludge pretreatment system, sludge alkaline fermentation system, fermentation liquid separation system, and municipal wastewater treatment with an anaerobic-anoxic-aerobic (A 2 /O) process
2006/2/1/ · In the plants with EBPR, 12 plants had normal anaerobic tanks on the main stream for mixing return sludge and incoming wastewater, whereas 9 plants had side stream hydrolysis (SSH) instead of an
2022/9/6/ · 3 Research status of organic wastewater fermentation hydrogen production process. Existing studies have studied hydrogen production in a variety of reactors, among which the most studied include (de Menezes and Silva, 2019) Continuous flow Stirred Tank Reactor (CSTR), Upflow Anaerobic Sludge Bed (UASB), Anaerobic …
2018/7/1/ · A certain volume of fresh sludge was daily pumped from the thickener to the tank for sludge concentration adjustment (1.6 m 3) (TK1), in which the TSS is adjusted to about 7.0%.Then, the sludge was pumped into the thermal-alkaline pretreatment tank (1.9 m 3) (TK2), which was operated under 70 °C, pH-12 and 2 h for sludge pretreatment.The …
2020/8/1/ · Subsequently, fermentation of alkali + ultrasonication pretreated sewage sludge in a semi-continuous stirred tank reactor (CSTR) produced a maximum hydrogen yield of 0.1 mmol H2/g VS, three times