Yingchao Cheng

Kyoto University | Kyodai · Department of Environmental Engineering

In this study, a novel catalytic air oxidation (CAO) process is proposed based on a facilely synthesized nanocomposite catalyst. The catalyst was prepared using Cu single atoms (CuSA) embedded on multiwalled carbon nanotubes (CNTs), denoted as [email protected]SA, with mass ratio of CuSA up to 10.02%. Humic acid (HA) and other typical refractory co...

Humic acid (HA), a refractory organic pollutant, has always been a key obstackle in wastewater treatment (such as biochemical landfill leachate). And catalytic air oxidation is one of the most promising methods to degrade HA efficiently and economically. In this study, a novel high-loading Cu single-atom catalyst (TiZrO4@CuSA) was facilely synthesi...

In 2017, the Minamata Convention (MC) on mercury (Hg) control entered into force. However, whether the MC is effective and how it reshapes the global Hg flow remain unclear. In this study, we established a method to detect inconsistencies in data on global Hg trade, and calculated the gap between the demand and supply of Hg to the artisanal and sma...

The United Nations Environment Programme has specifically identified the main causes of mercury accumulation in surface soils and the oceans to be closely linked to anthropogenic mercury emissions and releases. While appropriate implementation of the Minamata Convention on Mercury (effective since 16 August 2017) is expected to reduce global supply...

We evaluated mercury (Hg) behavior in a full-scale sewage sludge torrefaction plant with a capacity of 150 wet ton/day, which operates under a nitrogen atmosphere at a temperature range of 250–350ºC. Thermodynamic calculations and monitoring results show that elemental Hg (Hg⁰) was the dominant species in both the pyrolysis gas during the torrefact...

The emissions from crematoria have been identified as a source of mercury not currently being remediated. However, the effects of changing the operational conditions by installing a fabric filter (FF) to remove mercury from the flue gas of a crematorium have not been examined in detail. In this study, the mercury concentrations of crematoria flue g...

We investigated the distribution of 18 elements including non-volatiles (Al, P, Ca, Fe, Mg, K, Mn, Cu, Na, Cr, and Ni), semi-volatiles (Zn, Pb, Ag, As, and Cd), and volatiles (Hg and S) and compared their behaviors in two types of full-scale sewage sludge mono-incinerators, namely, a step-grate stoker (GS) and two fluidized bed incinerators (F-type...

High-solids anaerobic digestion of sewage sludge is a promising technology, but blocked mass transfer is a key problem. However, the blockage process is difficult to quantify due to lack of direct evidence and data. In this study, a modified diffusion membrane cell was used to analyze the diffusion coefficients in high-solids sludge using iodide io...

High-solids anaerobic digestion of sewage sludge was a promising process, but high solid concentration negatively influenced methane production. The influencing mechanism was systematically analyzed in this study through a series of static anaerobic digestion experiments at total solids (TS) contents of 3%–15%. The results showed that TS 6% was the...

The characteristics of high-solids anaerobic digestion (AD) of sewage sludge were investigated by comparison with conventional low-solids processes. A series of batch experiments were conducted under mesophilic condition and the initial solid contents were controlled at four levels of 1.79%, 4.47%, 10.28% and 15.67%. During these experiments, bioga...