混合碱和沸石联用对初沉污泥厌氧发酵性能的影响

在初沉污泥厌氧发酵过程中，以NaOH作为碱剂调节污泥pH，虽能有效提高发酵液中有机物浓度，但同时发酵液中的氮、磷等副产物的含量也增加，且发酵后污泥脱水性能较差。为解决上述问题，通过小试实验，考察了NaOH与Ca（OH）2混合碱和沸石联用的强化方式对发酵液性质及污泥脱水性能的影响。实验结果表明：采用NaOH与Ca（OH）2比值为1 : 3的混合碱液调节初沉污泥pH至10，且同步投加80 g·L-1沸石时，具有较好的强化发酵及控制氮、磷副产物的产生的特性，同时发酵后污泥具有较好脱水性能。在此条件下，发酵液的TVFA、SCOD、NH4+-N和PO43--P分别为2 898.1、4 960、106.1和3.1 mg·L-1，具有作为反硝化碳源的潜力，同时发酵后污泥CST值为273.9 s，具有较好脱水性能，有利于污泥的后续处理。

Effect of combined use of alkali and zeolite on anaerobic fermentation performance of primary sludge

During the anaerobic fermentation process of primary sludge, although NaOH using as alkaline agent to adjust the sludge pH could effectively improve the organic concentration in the fermented broth, it resulted in increasing concentrations of the byproducts such as nitrogen and phosphorus, and poor dewatering performance of fermented sludge. To solve these problems, a series of lab-scale experiments were conducted to investigate the effects of the combined use of the NaOH/Ca(OH)2 blended system and zeolite on the fermented broth characteristic and the sludge dewatering performance. The results indicated that intensifying fermentation, generation control of nitrogen and phosphorus, and excellent dewatering performance of fermented sludge could be acheieved when primary sludge pH was kept at 10 by dosing the mixed alkaline with the NaOH to Ca(OH)2 volume ratio of 1 : 3, and the dosage of zeolite added simultaneously was 80 g·L-1. Under this condition, the corres-ponding concentrations of TVFA, SCOD, NH4+-N, and PO43--P were 2 898.1,4 960,106.1,3.1 mg·L-1, respectively, indicating great potential as the carbon source for denitrification. And the fermented sludge with the CST value of 273.9 s exhibited good dewatering performance, resulting in the benefit to the follow-up treatment.