Farklı atıkların anaerobik çürütülmesinin üst suyundan fosfor geri kazanımının incelenmesi

Due to depleting phosphorus reserves and the nonrenewable and irreplaceable nature of phosphorus with another substance, phosphorus recovery has become increasingly important so as one of the significiant problems awaiting emerging solution.. Phosphorus is one of the building blocks of cells and essential for the sustainability of agricultural land as well as it is crucial for the continuation of the life cycle. Beside of that phosphorus obtained from phosphorus rocks naturally, unnatural phosphorus cycle can also be considered as phosphorus source. Unnatural phosphorus cycle involves extensive applications in a variety of industries and products including detergents, fertilizers, paints, food and baverages, pharmaceuticals also human and animal excrement. Becausethis cycle is a valuable phosphorus resource, a significiant amount of phosphorus is recovered from this cycle as well as avoiding the excess phosphorus discharge to ecosystem. So, wastewater could be used as a major phosphorus resource. The aim of this study is to recover phosphorus from anaerobic digester supernatant. In particular, studies showed that high amount of phosphorus could be recovered from enhanced biological phosphorus removal wastewater treatment plants with anaerobic digestion reactor. Phosphorus recovery methods constitute the largest part of the crystallization process, which is addition of chemicals to the wastewater or sewage sludge, the precipitated phosphorus is provided. Product of recovered phosphorus has ability to be used as fertilizer on agricultural land. In this study, phosphorus is recovered from the supernatant of an anaerobic digester as sutrivite precipitate. In order to increase both the amount of phosphorus recovered and biogas efficiency, various wastes (sewage sludge, municipal organic waste and leachate) were digested together anaerobically. After anaerobic digestion, phosphorus is recovered as struvite precipitation through pH adjustment with 0,1 M NaOH without any chemical addition, . Phosphorus (total phosphorus and ortophosphate) and ammonia nitrogen were analyzed from anaerobic digester supernatant and struvite precipitate that is dissolved in acidic solution to measure the efficiency of recovered phosphorus,. 77 % phosphorus recovery with struvite precipitation is provided. Although reserves of phosphate rocks have been run out speedily and various studies have been conducted about phosphorus recovery from wastewater treatment plants, current recovery technologies can not cope with the mining the phoshate rocks in terms of price. As well as necessitation of developments at phosphorus recovery studies, restricting phosphorus use to essential uses, improving the efficiency of phosphorus use and increasing the phosphorus recycling in the economy should be done.