Abstract:

Cellulose bearing wastewater from pulp black liquor(COD 6 000～8 000 mg/L) is difficult to be treated microchemically. The design and effect of microbial hydrolysis on the pulp black liquor treatment have been analyzed. It is indicated in practice that the sludge concentration in hydrolysis pond is 6. 5～7. 6 g/L, the volume load reaches 4. 2 kg/(m³·d), and the COD, SS removal rate can be up to 28%～38%, 54%～68%. The increment in VFA is 3. 4～4. 7 times, and in BOD/COD is 13%. Compared with coagulating deposition, microbial hydrolysis has the same effect, but the biochemical capacity of the wastewater is improved to a certain extent and the running expense is lessened by 93%.

Key words: microbial hydrolysis, pulp black liquor, cellulose-bearing wastewater

摘要：

浆粕黑液含短小纤维、木质素、纤维素、半纤维素、蜡质、果胶及其分解产物 (糖、脂肪酸、醇等 ), COD7000mg/L左右, 属含纤维素废水, 较难生物处理。在试验研究基础上设计了 3000m³ 完全混合式生物水解池, 对高分子有机物进行了预分解并提高了废水的可生化性。生产运行表明 :水解池污泥质量浓度 6.5～7.6 g/L, COD容积负荷达 4.2kg/(m³·d), COD、SS去除率分别为 28%～ 38%、54 %～ 68%, VFA提高 3.4～ 4.7倍, BOD/COD提高 13%。水解与混凝沉淀法比较, 处理效果相同, 还一定程度改善废水可生化性, 运行费用减少 93%。

关键词: 生物水解, 浆粕黑液, 含纤维素废水

CLC Number: 

• X703.1