Online measurement instruments present a good opportunity to monitor such processes, as they enable constant determination of the conditions inside a digester. One such instrument is the online analyzer AnaSense*, which facilitates monitoring, controlling, optimising, and protecting the anaerobic process. This instrument measures the following parameters, namely, pH, VFA, bicarbonates, and total and partial alkalinity. It was tested by the Swedish Municipal Joint Stock
Company (VIVAB [Vatten & Miljö i Väst AB]) at three different sites and the same samples were analyzed using three different laboratory methods.

線上監測儀器為監測厭氧過程提供很好的機會，因為它可以持續監測消化槽內部的狀況。水中VFA線上分析儀AnaSense *(AppliTek EZ7200 VFA線上分析儀)監視，控制，優化和保護厭氧過程。 測量參數為: pH，VFA，碳酸氫鹽以及總鹼度和部分鹼度。瑞典市政股份公司（VIVAB [Vatten＆Miljo i Vast AB]）以此監測方法在三個不同地點分別進行測試，並且使用三種不同的實驗室方法來對相同的水樣進行了分析。

 

Various industries are located in the Falkenberg municipal area or next to this city. Owing to the unstable conditions of industrial wastewater, treatment of the water at the largest WWTP, Smedjeholmen, presents a significant challenge. In particular, the wastewater from the Carlsberg brewery requires specific pre-treatment. The outlet process water from the brewery is pre-treated in an anaerobic internal circular reactor (IC reactor) located in the southern part of the municipality of Falkenberg. VIVAB is responsible for the maintenance and operation of this facility. The process water is treated in the IC reactor mainly for two purposes, namely to enhance biogas production and to decrease the BOD load prior to treatment at the Smedjeholmen WWTP.

 

The WWTP at Ullared is located in the municipal area of Falkenberg. It treats mainly influent water from the prem ises at the shopping centre at Gekås, which houses shops, restaurants, and a camping site. Accordingly, drastic changes and fluctuations occur in the hydraulic and the BOD loads in the inlet water during shopping hours and holidays. The WWTP at Ullared has a treatment capacity of 518 kg BOD7/day, which is equivalent to 7,400 PE. The WWTP was constructed as a biological phosphorous-removal plant (BIO-P) and a recirculated activated sludge pro cess (ARP) for VFA production is used.
The wastewater treatment process at Ullared WWTP consists of three main steps, namely, mechanical treatment, followed by biological treatment, and, finally, treatment in the polishing ponds.

 

Conclusion 

使用AnaSense分析儀(EZ7200 系列線上 VFA)進行試驗的重點是確定分析結果是否可信，以及分析儀是否是監測污水處理廠程序的有效儀器。 對於儀器的評估顯示，線上測量值確實是準確的。 線上測量值和實驗室測量值之間的結果比較顯示出分析儀的測值是可靠的，且所有測量值都依循相同的趨勢。 根據這些結果可以得出即使是程序中微小的變化也可以被識別出來。 因此，有可能優化程序而沒有消化槽酸化的風險。 Getteröverket污水處理廠可以省略預濃縮來改善程序，這樣每年可節省多達150,000瑞典克朗（15,500美元）並降低污泥運輸成本。