EFFECT OF NAHCO<sub>3</sub> ADDITION INTO NaCl REGENERANT ON NITRATE-SELECTIVE ION EXCHANGE REMOVAL PROCESS

DUAN Shou-peng; ZHENG Shao-kui

doi:10.13205/j.hjgc.202011012

Volume 38 Issue 11

Apr. 2021

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DUAN Shou-peng, ZHENG Shao-kui. EFFECT OF NAHCO3 ADDITION INTO NaCl REGENERANT ON NITRATE-SELECTIVE ION EXCHANGE REMOVAL PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 72-77. doi: 10.13205/j.hjgc.202011012

Citation:

DUAN Shou-peng, ZHENG Shao-kui. EFFECT OF NAHCO₃ ADDITION INTO NaCl REGENERANT ON NITRATE-SELECTIVE ION EXCHANGE REMOVAL PROCESS[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(11): 72-77. doi: 10.13205/j.hjgc.202011012

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EFFECT OF NAHCO₃ ADDITION INTO NaCl REGENERANT ON NITRATE-SELECTIVE ION EXCHANGE REMOVAL PROCESS

doi: 10.13205/j.hjgc.202011012

DUAN Shou-peng,
ZHENG Shao-kui^,

MOE Key Laboratory of Water and Sediment Sciences&State Key Lab of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China

Received Date: 2020-03-04
Available Online: 2021-04-23
Publish Date: 2021-04-23

Abstract

Abstract

The nitrate removal performance from spent brine by electrolysis was investigated, with 10 g/L NaHCO₃ added into 6 g/L NaCl regenerant as a pH buffer. Besides a stable pH level (8.3~9.1) during 8 h electrolysis of spent brine, there was a higher nitrate removal efficiency (i.e., 96%) achieved by the addition of NaHCO₃ than those achieved by the addition of diluted HCl solution and even without pH adjustment. The addition of NaHCO₃ also protected Fe cathodic plate from attacks of aggressive ions (e.g., chloride) in regenerant. The increase in NaCl concentration in regenerant from 6 g/L to 36 g/L led to a remarkable decrease in nitrate removal by 20%. Subsequently, this study investigated the long-term operation performance (i.e., 13 cycles) of the nitrate-selective ion exchange-regeneration-spent brine electrolysis process for nitrate-ridden groundwater treatment, with the addition of 10 g/L NaHCO₃ into 6 g/L NaCl regenerant. There were no side effect on product water quality, resin nitrate selectivity, regenerant elution capacity, and nitrate accumulation characteristics in regenerant observed after the addition of NaHCO₃. Nitrate concentration in product water stably met the required water quality standards for drinking water throughout the experimental periods.
- groundwater,
- nitrate,
- selective ion exchange,
- regenerant,
- electroreduction

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