Cranfield University, College Road, Cranfield, Bedford MK43 0AL, United Kingdom; Thames Water, Reading STW, Island Road, RG2 0RP Reading, United Kingdom.
Thames Water, Reading STW, Island Road, RG2 0RP Reading, United Kingdom.
Sci Total Environ. 2021 Feb 10;755(Pt 1):142684. doi: 10.1016/j.scitotenv.2020.142684. Epub 2020 Oct 6.
The benefits of deammonification to remove nitrogen from sidestreams, i.e., sludge dewatering liquors, in municipal wastewater treatment plants are well accepted. The ammonia removal from dewatering liquors originated from thermal hydrolysis/anaerobic digestion (THP/AD) are deemed challenging. Many different commercial technologies have been applied to remove ammonia from sidestreams, varying in reactor design, biomass growth form and instrumentation and control strategy. Four technologies were tested (a deammonification suspended sludge sequencing batch reactor (S-SBR), a deammonification moving bed biofilm reactor (MEDIA), a deammonification granular sludge sequencing batch reactor (G-SBR), and a nitrification suspended sludge sequencing batch reactor (N-SBR)). All technologies relied on distinct control strategies that actuated on the feed flow leading to a range of different ammonia loading rates. Periods of poor performance were displayed by all technologies and related to imbalances in the chain of deammonification reactions subsequently effecting both load and removal. The S-SBR was most robust, not presenting these imbalances. The S-SBR and G-SBR presented the highest nitrogen removal rates (NRR) of 0.58 and 0.56 kg N m d, respectively. The MEDIA and the N-SBR presented an NRR of 0.17 and 0.07 kg N m d, respectively. This study demonstrated stable ammonia removal from THP/AD dewatering liquors and did not observe toxicity in the nitrogen removal technologies tested. It was identified that instrumentation and control strategy was the main contributor that enabled higher stability and NRR. Overall, this study provides support in selecting a suitable biological nitrogen removal technology for the treatment of sludge dewatering liquors from THP/AD.
从市政污水处理厂的侧流（即污泥脱水液）中去除氮的脱氨作用的好处已被广泛接受。从热水解/厌氧消化（THP/AD）中产生的脱水液的氨去除被认为具有挑战性。许多不同的商业技术已被应用于从侧流中去除氨，其在反应器设计、生物量生长形式和仪器仪表和控制策略方面有所不同。测试了四种技术（脱氨悬浮污泥序批式反应器（S-SBR）、脱氨移动床生物膜反应器（MEDIA）、脱氨颗粒污泥序批式反应器（G-SBR）和硝化悬浮污泥序批式反应器（N-SBR））。所有技术都依赖于不同的控制策略，这些策略作用于进料流量，从而产生不同的氨负荷率。所有技术都显示出性能不佳的时期，这与脱氨反应链的不平衡有关，随后影响负荷和去除。S-SBR 最为稳健，不会出现这些不平衡。S-SBR 和 G-SBR 的氮去除率（NRR）最高，分别为 0.58 和 0.56 kg N m d。MEDIA 和 N-SBR 的 NRR 分别为 0.17 和 0.07 kg N m d。本研究从 THP/AD 脱水液中稳定地去除了氨，并且在测试的氮去除技术中没有观察到毒性。研究发现，仪器仪表和控制策略是实现更高稳定性和 NRR 的主要因素。总的来说，本研究为选择适合 THP/AD 污泥脱水液处理的生物脱氮技术提供了支持。
