Bio-electro-Fenton processes for wastewater treatment: Advances and prospects

Abstract

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Bio-Electro-Fenton: a novel method for treating leachate in Da Phuoc Landfill, Vietnam

“…Both of case pH is too low and too high are effect to the efficiency of the Fenton process 4 also increases with increasing pH 7,8 . The accumulation of protons due to the slow and insufficient protons diffusion through membrane would cause a decrease of pH in anode chamber 6 . Therefore, the cathode electrode material as a source to self-regulate the supply of Fe 2+ under neutral conditions is necessary to reduce the cost of pH adjusting chemicals.…”

“…Besides, increasing the current too high will affect processing efficiency while wasting a significant amount of energy. In this case, optimized current intensity is usually chosen to attain the maximum H 2 O 2 production rate and yield, and its value quite depends on the cathode material used 6…”

“…Oxy is one of the key parameters in the BEF system, which is the electron acceptor in the cathode chamber to produce H 2 O 2 . High airflow rate could enhance the dissolved oxygen in solution and promote the oxygen mass transfer rate, and thus, is beneficial for H 2 O 2 production and accumulation in bioelectrochemical systems 6 . It is important to set the optimal airflow rate because if the speed is too low, it will not maintain enough dissolved oxygen and if the speed is too high, it will cost a lot of operating energy for the system.…”

“…COD treatment efficiency increased with increasing airflow rate and reached 68.20 ± 1.04 % (Figure 6) at the maximum airflow rate of 12 L air/minute. The reason is that the excessive high airflow rate could also disturb the mass transfer between catholyte and electrode and lead to a low catalytic efficiency for pollutants degradation by the Fenton process 6 . The ratio of BOD 5 /COD also increased significantly due to ( • OH) hydroxyl free radicals non-selectively reacts with POPs compounds to create more easily biodegradable compounds.…”

Harmless Treatment of Phenylhydrazine Hydrochloride Production Effluent: From Lab Scale to Pilot Scale

“…Various treatment technologies have been investigated, including physicochemical methods [6][7][8], incineration [9,10], and advanced oxidation processes [11][12][13][14]. The technology is available depending on the composition of wastewater [15][16][17]. Consequently, a promising treatment technology needs to be specific to a particular type of wastewater [10].…”