Formaldehyde (HCHO) is a toxic organic compound with carcinogenic properties which is present in the furniture industry painting booth wastewater (PBW) and does not receive adequate treatment in its industrial environment. This effluent treatment commonly occurs by physicochemical processes that do not remove formaldehyde, while advanced treatment methods are costly for industrial scale application. This study assessed a system consisting of an anaerobic sequential batch reactor (ASBR) followed by an aerobic sequential batch reactor (SBR) for the PBW treatment. The system performance was evaluated by the gradual increase of HCHO concentration from 34 ± 5 to 232 ± 10 mg HCHO L⁻¹, and chemical oxygen demand (COD) from 585 ± 8.4 to 3960 ± 100 mg O₂ L⁻¹, performed with cycle time of 4 days in ASBR and 2 days in SBR, evaluating the formaldehyde potential toxicity on anaerobic biomass. The ASBR-SBR system removed 99% of COD and HCHO until initial concentration of 180 ± 7 mg HCHO L⁻¹. The HCHO concentration increase to 232 ± 10 mg L⁻¹ reduced the removal efficiency of organic matter to 72% in ASBR due to partial inhibition of microorganisms caused by formaldehyde toxicity. However, under these conditions, the SBR was efficient and removed the remaining organic matter by 98%. The performance of ASBR-SBR showed that this simple system was suitable for the PBW treatment at the evaluated concentrations.

甲醛（HCHO）是一种具有致癌特性的有毒有机化合物，存在于家具行业的喷漆房废水（PBW）中，并且在其工业环境中未得到适当的处理。这种废水处理通常是通过不去除甲醛的物理化学过程进行的，而先进的处理方法对于工业规模的应用而言是昂贵的。这项研究评估了一个由PBW处理的厌氧顺序分批反应器（ASBR）和好氧顺序分批反应器（SBR）组成的系统。通过将HCHO浓度从34±5逐渐增加到232±10 mg HCHO L ^-1和将化学需氧量（COD）从585±8.4增加到3960±100 mg O ₂ L ^-1来评估系统性能在ASBR中以4天为周期，在SBR中以2天为周期，评估甲醛对厌氧生物质的潜在毒性。ASBR-SBR系统去除了99％的COD和HCHO，直到初始浓度为180±7 mg HCHO L ^-1为止。HCHO浓度增加到232±10 mg L ^-1时，由于甲醛毒性所引起的微生物的部分抑制，使ASBR中有机物的去除效率降低至72％。但是，在这些条件下，SBR效率很高，并且将残留的有机物去除了98％。ASBR-SBR的性能表明，该简单系统适用于所评估浓度的PBW处理。