Abstract
The recycling of waterworks sludge has become a trending issue because it not only solves the problem of difficult disposal but also saves land resources. This paper aimed to provide a new idea for the utilization of waterworks sludge to form ceramsite and to purify sewage. The specific surface area, average pore size, and pore volume of the made ceramsite were 8.15 m2/g, 8.53 nm, and 1.88 cm2/g, respectively. The made ceramsite was applied in a vertical-flow constructed wetland, and the removal efficiency of nitrogen, phosphorus and organic matter in sewage were investigated under the conditions of different start-up periods, hydraulic retention times, matrix filling heights and water quality. The removal rates of chemical oxygen demand (COD), ammonia nitrogen (NH3-N), and total phosphorus (TP) in the constructed wetlands were stable at 70%, 60%, and 79%, respectively. This constructed wetland with a ceramic matrix has certain advantages in the total amount of denitrifying microorganisms, with a proportion of 14.92%. The results prove the feasibility of preparing ceramsite from waterworks sludge and applying it as a matrix in a constructed wetland to purify sewage.
Highlights
Drinking waterworks sludge, which is the by-product of drinking water treatment processes, is considered water industrial waste
The main objective of this paper study the feasibility of preparing ceramsite the sewage sludge of a water supply plantwas and to using it as a matrix in constructed wetlands
This study focused on investigating the removal efficiency of chemical oxygen demand (COD), NH3 -N and total phosphorus (TP) under different
Summary
Drinking waterworks sludge, which is the by-product of drinking water treatment processes, is considered water industrial waste. In China, the dry sludge amount reached 6.25 × 106 tons in. Sludge usually consists of inorganic salts, heavy metals, pathogenic microorganisms and a small amount of organic contaminants [2]. Waterworks sludge can pose a serious threat to the ecological environment and human activities. Waterworks sludge is mainly disposed of by sanitary landfill, incineration, ocean discharge, building materials and land applications [3]. No methods are ideal in terms of cost and application. In this sense, the harmlessness and resourcefulness of the use of the waterworks sludge has become a great challenge and has attracted widespread attention
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