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Abstract This study used fly ash, cement and three types of desulfurization wastewater with different water qualities from coal-fired power plants, and the wastewater includes the raw water produced by the desulfurization tower, the effluent of the raw water after three-box treatment and the high-salt water from evaporation of the effluent compared with the deionized water, which were used in the preparation of fly ash-based products (for example, fly ash brick). Under the water-binder ratio of desulfurization wastewater and fly ash-cement composite powder of 0.28 condition, two fly ash-cement ratios of 7:3 and 9:1were used to prepare samples, which were cured for 28 days. The influences of cement content and different water quality on its compressive strength and flexural strength were studied. The results show that the compressive strength and flexural strength of the samples with fly ash-cement ratio of 7:3 are higher than 9:1, and the strengths of the samples using high salt water are the lowest, which is consistent with the expectation. In the aspect of flexural strength, the sample using raw water of two different fly ash-cement ratios is the highest, which has no obvious difference with the deionized water, and is higher than the effluent, and far higher than the high salt water. In the aspect of compressive strength for the fly ash-cement ratio of 7:3, the sample using effluent is the highest, and it is higher than raw water, which has no obvious difference with deionized water. At the fly ash-cement ratio of 9:1, the strength of fly ash-based products with raw water is the highest, and it is higher than the effluent, the effluent is higher than the deionized water. According to the strength grade requirements of the JC239—2001, fly ash-based products were prepared by using fly ash and desulfurization wastewater with different water quality as raw materials and appropriate cement dosage can meet the strength requirement of MU10 and achieve the goal of using waste (fly ash) to treat waste (desulfurization wastewater).
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Published: 31 October 2024
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2024, Vol. 0 
