搜索

生物电化学CO2捕获和存储废水处理

[复制链接]
学社技术 发表于 2019-9-2 12:24 | 显示全部楼层 打印 上一主题 下一主题
能量自给及处理过程零CO2排放,成为未来国际公认的未来污水处理发展方向,这方面的研究成为国际污水处理最热点的研究领域——没有之一!
' C% X+ j  C5 M3 w+ f. h
9 g1 }+ h' L, T( y美国科罗拉多大学的科学家们提出了一种新的污水处理耦合CO2捕获技术,此技术路线不但可以大幅度减少处理过程CO2等温室气体的排放量,同时利用此过程产生电能,采用此微生物点解CO2捕获技术,可以使污水厂变成“正能量”污水厂。这就意味着,不但将污水厂本身处理过程产生的CO2回收,甚至可以将城市的热电厂燃煤过程释放的CO2搜集起来用于污水处理过程的CO2捕获,并产生大量的清洁能源。# B( C( [' L/ @5 e& _$ h& G: ]6 |+ a  P2tech.cn
( \2 g! W7 P5 q" Q2tech.cn
这无疑也是革命性的。& T# W1 Z- y4 W5 U, U6 g9 `! j) w. T2tech.cn

  h" Z" O& y- xEngineers at the University of Colorado Boulder have developed an innovative waste water treatment process that not only mitigates carbon dioxide (CO2) emissions, but actively captures greenhouse gases as well.1 l2 b* p" B! }  z" |) I3 H0 J, @! \2tech.cn
/ i' N2 v! I2 v7 w1 ?. Z( ?2tech.cn
Microbial Electrolytic Carbon Capture (MECC)
# b; U; F8 ?, h0 X3 N" m' [The treatment method, known as Microbial Electrolytic Carbon Capture (MECC), purifies wastewater in an environmentally-friendly fashion by using an electrochemical reaction that absorbs more CO2 than it releases while creating renewable energy in the process.9 D! Y: F3 F  v1 [; d2tech.cn
“This energy-positive, carbon-negative method could potentially contain huge benefits for a number of emission-heavy industries,” said Zhiyong Jason Ren, an associate professor of Civil, Environmental, and Architectural Engineering at CU-Boulder and senior author of the new study, which was recently published in the journal Environmental Science and Technology.$ |1 S5 C& |2 C; e# I1 v# C2tech.cn
Wastewater treatment typically produces CO2 emissions in two ways: the fossil fuels burned to power the machinery, and the decomposition of organic material within the wastewater itself. Plus, existing wastewater treatment technologies consume high amounts of energy. Public utilities in the United States treat an estimated 12 trillion gallons of municipal wastewater each year and consume approximately 3 percent of the nation’s grid energy.) R. [4 b" k, t2tech.cn
Existing carbon capture technologies are energy-intensive and often entail costly transportation and storage procedures. MECC uses the natural conductivity of saline wastewater to facilitate an electrochemical reaction that is designed to absorb CO2 from both the water and the air. The process transforms CO2 into stable mineral carbonates and bicarbonates that can be used as raw materials by the construction industry, used as a chemical buffer in the wastewater treatment cycle itself or used to counter acidity downstream from the process such as in the ocean.. |8 U' d6 F3 v. C, N2tech.cn
The reaction also yields excess hydrogen gas, which can be stored and harnessed as energy in a fuel cell.
: p2 F  @  |$ ~6 v2 ~  s& ~5 |' u9 nThe findings offer the possibility that wastewater could be treated effectively on-site without the risks or costs typically associated with disposal. Further research is needed to determine the optimal MECC system design and assess the potential for scalability." W9 l4 |/ J" n, O( Q- C5 x) j  @; d2tech.cn
“The results should be viewed as a proof-of-concept with promising implications for a wide range of industries,” said Ren.6 W7 {  O% U  I( B% U, d2tech.cn
Power companies have many reasons to perk up at the possibility of a carbon-negative wastewater treatment solution. The Environmental Protection Agency’s Clean Power Plan, expected to take full effect in the year 2020, will require power plants to comply with reduced CO2 emission levels.* A% Y: B, \; J% }- d; v% d2tech.cn
The study may also have positive long-term implications for the world’s oceans. Approximately 25 percent of CO2 emissions are subsequently absorbed by the sea, which lowers pH, alters ocean chemistry and hence threatens marine organisms, especially coral reefs and shellfish. Dissolved carbonates and bicarbonates produced via MECC, however, could act to chemically counter these effects if added to the ocean./ `$ b  N0 E# w2tech.cn
“This treatment system generates alkalinity through electrochemical means and we could potentially use that to help offset the effects of ocean acidification,” said Greg Rau, a senior researcher at the Institute of Marine Sciences at the University of California Santa Cruz and a co-author of the study. “This is one of several environmentally-friendly things this technology does.”( N3 \3 d. @' F8 D; z2tech.cn
Many wastewater treatment plants are located on coastlines, raising the possibility that future MECC implementation in these facilities could couple both CO2 and ocean acidity mitigation.# l* y9 c# ]( V7 Q$ A! V2tech.cn
Energy and carbon neutral wastewater management is a/ ]4 B) H. J$ G; N9 S* e. j1 d2tech.cn
major goal for environmental sustainability, but current progress has only reduced emission rather than using wastewater for active CO2 capture and utilization. We present here a new microbial electrolytic carbon capture (MECC) approach to potentially transform wastewater treatment to a carbon negative and energy positive process. Wastewater was used as an' f/ @+ {6 w9 b3 @( {, i- b( g2tech.cn
electrolyte for microbially assisted electrolytic production of H2 and OH. at the cathode and protons at the anode. The acidity dissolved silicate and liberated metal ions that balanced OH., producing metal hydroxide, which transformed CO2 in situ into (bi)carbonate. Results using both artificial and industrial wastewater show 80.93% of the CO2 was recovered from both CO2 derived from organic oxidation and additional CO2 injected into the headspace, making the process carbon-negative. High rates and yields of H2 were produced with 91.95% recovery efficiency, resulting in a net energy gain of 57.62 kJ/mol-CO2 captured. The pH remained stable without buffer addition and no toxic chlorine-containing compounds were detected. The produced (bi)carbonate alkalinity is valuable for wastewater treatment and long-term carbon storage in the ocean. Preliminary evaluation shows promising  conomic and environmental benefits for different industries.
8 ^* p4 N- k* O' n" q! IEngineers at the University of Colorado Boulder have developed a wastewater treatment that captures CO2, produces energy, and could help reduce rising acidity in the oceans.
. n! }' \) b& K$ h3 V" x3 g
3 p# Q6 m/ V- D. d, ^/ a5 {) e 环境学社1.jpg . A+ m5 A0 S8 C, ^2tech.cn
- t: ~- ~& H2 ^  y7 f2tech.cn
Rotork at Amsterdam water treatment plant* F: m( z! c  f) H4 G. z& r- _2tech.cn
" Z  ]5 L" U2 _- n3 n" [2tech.cn
According to the research, published recently in the journal Environmental Science and Technology, Microbial Electrolytic Carbon Capture (MECC) involves an electrochemical reaction that absorbs more CO2 than it releases, creating a source of renewable energy in the form of hydrogen gas at the same time.+ P! E( B" ~- \3 Z. l! q2tech.cn
“This energy-positive, carbon-negative method could potentially contain huge benefits for a number of emission-heavy industries,” said Zhiyong Jason Ren, an associate professor of civil, environmental, and architectural engineering at CU-Boulder and senior author of the study.
/ y+ Q" g7 M6 s7 g7 R" X( q. \Traditional wastewater treatment contributes to CO2 emissions through both the decomposition of organic material, and the fossil fuels burned to power energy-intensive treatment machinery.
; t( }3 J1 U3 v+ H0 G0 DMECC uses the natural conductivity of saline wastewater to facilitate an electrochemical reaction designed to absorb CO2 from water and air. According to the team at CU-Boulder, the process transforms the CO2 into stable mineral carbonates and bicarbonates. These can then be used as raw materials in the construction industry, a chemical buffer in the wastewater treatment cycle itself, or to reduce acidity downstream of the process such as in the ocean. 1 n2 J0 P8 V$ a" u! P2tech.cn

3 J3 p& B; O/ }/ ^6 U, i; w( q( B 环境学社2.jpg
% F. y4 D. x2 Z0 }" w2 @5 w& o* H: @4 m8 R' i' A2tech.cn
Rising acidity in the oceans is a threat to marine life, particularly shellfish and coral.
# X  S: ]8 @* z- q9 J& V# N' Z4 y9 u2tech.cn
Ocean absorption of CO2 increases acidity and is a long-term threat to marine life. The researchers claim that the dissolved carbonates and bicarbonates produced via MECC could help chemically counter these effects.! t5 h* p, H$ H3 Y+ h% f' I4 [2tech.cn
“This treatment system generates alkalinity through electrochemical means and we could potentially use that to help offset the effects of ocean acidification,” said Greg Rau, a senior researcher at the Institute of Marine Sciences at the University of California Santa Cruz and a co-author of the study. “This is one of several environmentally-friendly things this technology does.”& j6 g5 o1 a" H, ~" a. V* \- \2tech.cn
The research raises hopes that wastewater could be treated on site rather than via the costly disposal methods currently used. However, further work is required to optimise the system as well as assess its scalability, according to the team.. C, r. `/ Y& U2tech.cn
“The results should be viewed as a proof-of-concept with promising implications for a wide range of industries,” said Ren.; f3 E2 O* L6 T5 K& t! H2tech.cn

! `3 u+ t7 ?) y& |& k相关论文摘要:Ambient CO 2 capture and storage in bioelectrochemically mediated wastewater treatment9 ~. t/ L3 h7 f2tech.cn
This study reports that wastewater can be used to capture and store CO 2 directly from ambient air and produce energy. The proof-of-concept system consisted of an ion exchange resin column that captures and concentrates ambient CO 2 using a moisture-driven cycle. The concentrated CO 2 was then transferred into a microbial electrochemical carbon capture (MECC) reactor for carbon sequestration and hydrogen production. Data from an average batch cycle showed that approximately 8 mmol/L CO 2 was captured in the MECC cathode when 0.14 g/L COD was removed in the anode. With 90% hydrogen conversion efficiency, the energy intensity and CO 2 absorption from the process could be 11.3 kJ/gCOD and 0.49 gCO 2 /gCOD respectively. If the proposed process is applied, over 68 million tons of atmospheric CO 2 can be captured yearly during wastewater treatment in the US, which equates to significant economic values if CO 2 taxes were to be implemented more widely.
) k( f% {) @, y% ^( p+ q
, Z3 \9 ]! d( R+ W! l

© 声明:本文仅表作者或发布者个人观点,与环保学社[2TECH.CN]无关。其原创性及陈述文字、内容、数据及图片均未经证实,对本文及其全部或部分内容、图片、文字的真实性、完整性、及时性本站不作任何保证或承诺,仅做参考并自行核实。如有侵权,请联系我们处理,在此深表歉意。

您需要登录后才可以回帖 马上登录 | 中文注册

本版积分规则

技术话题

关于我们
关于我们
友情链接
联系我们
帮助中心
网友中心
购买须知
支付方式
服务支持
资源下载
售后服务
定制流程
关注我们
官方微博
官方空间
官方微信
快速回复返回顶部 返回列表