Zero-discharge industrial wastewater treatment is an inevitable goal that enterprises seek for the green and sustainable development. However, the generation and treatment of mixed salt present an enormous challenge. This study, taking the practical case of coking wastewater treatment, analyzes the influencing factors of salt and proposes a load salt reduction strategy. The results show that chemical oxygen demand (COD) is the main factor for the change in salt content. When the influent COD of coking wastewater is 3863.93 ± 466.61 mg/L, the relationship between salt reduction (y) and the COD change rate (x) in the treatment process follows the ExpGro1 natural exponential function: y = −2.2378 × exp (-x/17.0839) + 2.2570, with a fitting degree of 0.9938. In the case where the economic and environmental benefits of this strategy are positive (with a maximum COD reduction of 0.5796 kg/m³), every 1.0 kg/m³ reduction in COD will result in a reduction of 2.5002 ± 0.2980 mS/cm·m³ in salinity, 3.7391 ± 0.9245 CNY/m³ in operating costs, and 1.4989 ± 0.6509 kg CO₂/m³ in carbon emissions. Moreover, this study proves that the adsorption - oxic/hydrolytic & heterotrophic denitrification/oxic (A-OHO) process can effectively reduce the load salt. Other salt reduction strategies (technology salt reduction and cycle salt reduction) and the concept of strategic cooperative operation are also further explored.

中文翻译：

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典型工业废水处理过程中的盐暴露和减排策略


工业废水零排放处理是企业追求绿色可持续发展的必然目标。然而，混合盐的产生和处理带来了巨大的挑战。本文以焦化废水处理的实际案例为研究对象，分析了盐的影响因素，提出了负荷减盐策略。结果表明：化学需氧量 （COD） 是影响盐含量变化的主要因素。当焦化废水进水COD为3863.93 ± 466.61 mg/L时，处理过程中减盐量（y）与COD变化率（x）的关系服从ExpGro1自然指数函数：y = −2.2378 × exp （-x/17.0839） + 2.2570，拟合度为0.9938。如果该策略的经济和环境效益为正（最大 COD 降低 0.5796 kg/m³），则 COD 每降低 1.0 kg/m³，将导致盐度降低 2.5002 ± 0.2980 mS/cm·^{m 3}，运营成本降低 3.7391 ± 0.9245 CNY/m³，± 1.4989 0.6509 kg CO₂/m³在碳排放方面。此外，这项研究证明，吸附 - 氧化/水解和异养反硝化/氧化（A-OHO）过程可以有效地减少盐的负荷。其他减盐策略（技术减盐和循环减盐）和战略合作运营的概念也得到了进一步的探索。