Search Results

You are looking at 41 - 50 of 109 items for :

  • "sewage sludge" x
  • All content x
Clear All
Free access

Mondher Bouden and Jacques-Andre Rioux

Large spaces are required to eliminate waste by burying and this method is very costly. The horticulture use of waste seems to be one of the best optional methods of disposal. This study was performed to evaluate the effects of fresh bio-filters (FBF), composted sewage sludges (CSS), and composted de-inked sludges (CDS) on growth of three woody ornamental species (Spiraea japonica `Little Princess', Spiraea nipponica `Snowmound', and Physocarpus opulifolius `Nanus') produced in containers. Three fertilization regimes (N at 200, 400, and 600 mg·L–1 in the form of soluble fertilizer 20–20–20) were applied weekly onto containers during 3.5 months. Plants were potted in 10 substrates. The control substrate contained 4 peatmoss: 5 composted conifer bark: 1 fine crushed gravel (by volume). In the other nine substrates, peatmoss was partially substituted by one of the three organic residues (10%, 20%, or 30% of FBF, CSS, or CDS). The experimental design was a split-split-plot with four replicates and two samples by treatment. Chemical analysis of the organic residues proved that the fertilization value of CSS was greater than the other residues and heavy metals are below the undesirable limits for the three residues. The amount of available major mineral elements in these residues is too low to satisfy the mineral nutrient needs of plants. In addition, there is a linear effect of the fertilization on plant growth. The CDS required a high dose of the fertilizer (600 mg·L–1) which may be due to the immobilization of N. The 10% proportion of FBF and CDS, combined with the other materials, was the most adequate proportion and did not reduce the growth of plants (height, aerial, and root dry matter). However, CSS can be used with a high proportion (20%) especially for Spiraea japonica `Little Princess'.

Free access

Ugur Bilgili, F. Olcay Topac-Sagban, Irfan Surer, Nejla Caliskan, Pervin Uzun, and Esvet Acikgoz

available nutrients in sewage sludges. The color of turfgrass produced from composted-sewage sludge amendments was comparable to that of turfgrass fertilized with ammonium nitrate ( Angle, 1994 ; Markham, 1998 ). Moreover, if turfgrass receives adequate

Full access

Michael Raviv

Compost is organic matter that has undergone partial thermophilic, aerobic decomposition. This environmentally safe process is called composting. The combination of raw materials and the chosen composting method yields a wide range of characteristics, such as organic matter (OM) content, nutrient content, potential for disease suppressiveness and other physical, chemical, and biological properties. The objectives of this review are describing the horticultural outlets for composts, defining compost characteristics important for the above uses, and describing composting procedures and raw materials leading to these characteristics. The two main horticultural uses of composts are as soil amendment and as an ingredient in container media. Soil-applied composts improve soil fertility mainly by increasing soil organic matter (SOM) that activates soil biota. Compost's nutrient content, and especially that of nitrogen (N), should be high (>1.8%). Composts having these characteristics are produced of raw materials rich in both OM and N, while minimizing their loss during composting. Typical raw materials for this purpose include animal manures, offal, abattoir residues, sewage sludge, and grass clippings. Various composting methods can yield the required results, including turned windrows, aerated static piles, and in-vessel composting. Composts are also used for substrates as low-cost peat substitute, potentially suppressive against various soilborne diseases. These composts must be stable and non-phytotoxic. Physical properties of compost used as substrate are important. Hydraulic conductivity, air porosity, and available water should be high. Reconciling the physical and biological demands may be difficult. Materials such as softwood bark, wood shavings, various types of shells or hulls, and coconut coir are characterized by good physical properties after composting. However, being relatively resistant to decomposition, these materials should be subjected to long and well-controlled composting, which may be shortened using N and N-rich organic matter such as animal manures. High temperatures [>65 °C (149.0 °F)] may cause ashing, which leads to reduced porosity. In addition to ligneous materials, composts serving as growing media may be produced from numerous organic wastes, such as manures, food industry wastes, etc. These materials are better composted in aerated static piles, which tend to minimize physical breakdown. Animal excreta are of special value for co-composting as they contain large, diverse populations of microorganisms, which accelerate the process.

Full access

Monica Ozores-Hampton

temperature must remain between 131 and 170 °F for 3 d in an in-vessel or static aerated pile; or 15 d in windrows, which must be turned at least five times during this period ( USDA, 2016 ). The application of sewage sludge or biosolids is prohibited, whether

Free access

Zhihui Chang, Laiqiang Zhuo, Fangfang Yu, and Xunzhong Zhang

Biosolids are treated sewage sludge that have strict requirements for pollutant concentrations as well as reduction of pathogens and vector attractions ( USEPA, 1993 ; Virginia Department of Health, 1997 ). Biosolids are valued as a source of plant

Full access

Stephanie Burnett, Neil Mattson, Brian Krug, and Roberto Lopez

industry in Maine HortTechnology 19 743 747 Chaney, R.L. Munns, J.B. Cathey, H.M. 1980 Effectiveness of digested sewage sludge compost in supplying nutrients for soilless potting media J. Amer. Soc. Hort. Sci. 105 485 492 Dennis, J.H. Lopez, R.G. Behe, B

Full access

Rita L. Hummel, Craig Cogger, Andy Bary, and Robert Riley

al., 2010 ). Tagro mix is a garden amendment made from Class A biosolids from the City of Tacoma (50%), screened sand (25%), and sawdust (25%). Biosolids are a residual product of wastewater treatment (sewage sludge) that has been treated to meet U

Full access

Mohammed El-Sayed El-Mahrouk, Yaser Hassan Dewir, and Salah El-Hendawy

. Canet, R. Ibanez, M.A. Pomares, F. Garcia, J. 1998 Use of MSW compost, dried sewage sludge and other wastes as partial substitutes for peat and soil Bioresour. Technol. 63 123 129 Jahromi, M.G. Aboutalebi, A. Farahi, M.H. 2012 Influence of different

Full access

Yuqi Li and Neil S. Mattson

) systematically studied the chemical and physical properties of charcoal, coffee husk, pine bark, cattle manure, chicken manure, coconut fiber, sewage sludge, peat, and vermiculite. Results showed that coffee husk, sewage sludge, chicken manure, and cattle manure

Free access

Brian A. Kahn, Niels O. Maness, Donna R. Chrz, and Lynda K. Carrier

higher phenolic concentrations for pak choi ( Brassica rapa L. Chinensis group) compared with conventional fertilization with mineral fertilizers. The application of sanitized sewage sludges to pepper ( Capsicum annuum L.) plants improved yield without