A high efficiency biological system for treatment of coal gasification wastewater – a key in-depth technological research

Abstract

Wastewater treatment technology with a simple processing unit, easy management, low energy consumption, low sludge production and a cost of 0.135 $ per m3.

Self-doped N, S porous carbon from semi-coking wastewater-based phenolic resin for supercapacitor electrodes

“…For decades, the coal industry has remained a major source of wastewater ( Mz et al, 2020 ). In addition, numerous phenolic pollutants are present in coal chemical wastewater, which complicates its composition and water quality ( Ji et al, 2015 ; He et al, 2021 ; Bao et al, 2022 ). Particularly, semi-coking wastewater ( Liu et al, 2021 ), which is produced by the carbonization of coal at low (500–600°C) and medium (700–800°C) temperatures ( Bai et al, 2022 ), is contaminated with phenols, ammonia, hydrogen sulfide, carbon dioxide, and oil, etc.…”

Effect of NaOH Treatment on the Low-Temperature Oxidation Behavior of Lignite

“…Coal is an important basic energy source supporting the stable growth and sustainable development of the world economy. , With the excessive consumption of high-rank coal, more and more low-rank coal is currently being mined and applied. , In some countries, such as China and Australia, lignite has become a major resource used in industry. , As a typical low-rank coal, lignite itself is loose in texture, high in water content, and easily weathered in air. , Besides, lignite contains a large amount of volatiles and oxygen-containing functional groups, making it suffer from many disadvantages such as intense oxidation reactivity, a low ignition point, and high pollution when burned. Therefore, lignite is not easy to store and transport, which greatly limits the utilization of lignite and causes safety problems. , …”

“…3,4 In some countries, such as China and Australia, lignite has become a major resource used in industry. 5,6 As a typical lowrank coal, lignite itself is loose in texture, high in water content, and easily weathered in air. 7,8 Besides, lignite contains a large amount of volatiles and oxygen-containing functional groups, making it suffer from many disadvantages such as intense oxidation reactivity, a low ignition point, and high pollution when burned.…”

Advanced treatment of biologically pretreated coal gasification wastewater using a novel expansive flow biological intermittent aerated filter process with a ceramic filler from reused coal fly ash

“…Biologically pretreated coal gasication wastewater (CGW) could cause serious deterioration of the environment due to it containing a large number of various toxic and refractory compounds including phenolic compounds, long-chain hydrocarbons, nitrogenous heterocyclic compounds and ammonia. 1,2 What's worse, this wastewater exhibits poor biodegradability (BOD 5 /COD of 0.13), a low carbon/nitrogen ratio (COD/TN of 2.8) and toxicity to the microbes in the activated sludge process; the resulting water quality struggles to meet the standards for the reuse of water using conventional biological treatment methods. 3 Wastewater control has become a bottleneck for the development of the coal gasication industry, which has played a key role in the new clean and renewable energy market in recent years.…”