Solar driven device and method for treating wastewater and producing hydrogen by coupling

Abstract

The invention discloses a solar driven device and method for treating wastewater and producing hydrogen by coupling. The device comprises a stereocatalytic electrode reactor and photovoltaic, pipeline, water storage, and hydrogen collection systems, wherein the stereocatalytic electrode reactor comprises a monovalent cation exchange membrane and cathode and anode chambers, and cathode and anode plates are respectively arranged in the cathode and anode chambers; the cathode and anode chambers are respectively filled with supported activated carbon particles to form stereocatalytic electrode anode and cathode groups, and the photovoltaic system comprises a solar photovoltaic panel, a regulated power supply, and a single pole double throw switch; the pipeline system comprises a wastewater inlet and outlet pipe, a wastewater introduction pipe and pump, a wastewater return pipe, a wastewater outlet valve, a dilute alkali liquid introduction pipe and pump, a concentrated alkali liquid returnpipe, and a concentrated alkali liquid outlet pipe and valve, and the water storage system comprises wastewater and alkali liquid storage tanks; the hydrogen collection system comprises a hydrogen tank and an air duct. The solar energy is driven to treat wastewater, the COD removal rate of an effluent is 70% to 80%, and the hydrogen production amount is 1 to 2 L / h.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment / electrochemistry / new energy, and specifically relates to a solar-driven electrochemical system capable of synchronously treating refractory wastewater and producing hydrogen. Background technique [0002] In recent years, with the rapid development of petrochemical, plastic, synthetic fiber, coking, printing and dyeing industries, a large amount of refractory wastewater has been produced, including printing and dyeing wastewater, acrylic fiber wastewater, coking wastewater, etc. This type of water has a high content of organic pollutants , high chroma, high acidity and alkalinity, complex ingredients, large changes in water quality, poor biodegradability (B / C less than 0.3) and other characteristics. Therefore, advanced oxidation technologies, such as ozone, Fenton, and electrolysis technologies, are often required for pretreatment of refractory wastewater. However, although...

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Problems solved by technology

Therefore, advanced oxidation technologies, such as ozone, Fenton, and electrolysis technologies, are often required for pretreatment of refractory wastewater. However, although ozone has a strong oxidation effect, the selective oxidation of ozone molecules is not as good as oxidation ability and effect. Hydroxyl radicals, for which oxidation methods such as ozone / ultraviolet, ozone / H 2 o 2 The technology has been researched and developed, but the preparation of ozone has high energy consumption and low mass transfer efficiency, and the escaping ozone tail gas not only pollutes the surrounding atmospheric environment, but also brings serious acute or chronic health damage to operators

H in Fenton Technology 2 o 2 in Fe 3+ Under the action of a catalyst, a large number of hydroxyl radicals are generated, and the degradation effect on refractory wastewater is better, but this technology requires the use of a large amount of H 2 o 2 , the cost of wastewater treatment is high

In the traditional two-dimensional electrolysis technology, the impedance between the plates is large, so the voltage or current density between the plates needs to be large enough to achieve a better treatment effect, so the energy consumption is too large

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