Processes and Mechanisms in Sludge Treatment Wetlands

Stefanakis, Alexandros I.; Akratos, Christos S.; Tsihrintzis, Vassiliοs A.

doi:10.1016/b978-0-12-404612-2.00011-8

Cited by 4 publications

(2 citation statements)

References 24 publications

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“…The dewatering can be regarded as a solid-liquid separation mechanism to reduce the volume of raw septage, where the water content is diminished through drainage and evapotranspiration [6]. The presence of vegetation is found to be advantageous in enhancing the dewatering efficiency [7]. The remaining organic matter in the dewatered septage at the wetland surface are stabilised through microbial decomposition, which is the so-called mineralisation [8].…”

Section: Introductionmentioning

confidence: 99%

Dewatering and Treatment of Septage Using Vertical Flow Constructed Wetlands

Tan

Tang

et al. 2017

Technologies

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Abstract:The vertical flow constructed wetland (VFCW) has become an attractive decentralised technology for septage treatment. One of the main purposes of the septage treatment is to reduce the volume of raw septage through dewatering, where the solids content is retained in the wetland bed and the water content is released. The retention of solids forms a layer of sludge deposit at the wetland surface, and the drained water, the so-called leachate, typically contains a lower solids content. This article reports the performance of dewatering and filtration of a pilot-scale VFCW designed for septage treatment. A comparison between two feeding strategies, hydraulic loading rate (HLR) and solids loading rate (SLR), is presented. The dewatering efficiency through drainage was found to be dependent on the solids load. The removal of total solids (TS) and chemical oxygen demand (COD) were excellent as the quality of leachate showed that more than 90% of TS and COD were retained in the system. This study reveals that the feeding based on SLR delivered a more sustainable performance for dewatering and solids removal. The build-up of sludge deposit significantly deteriorated the dewatering efficiency through drainage, but it tended to improve the filtration capacity.

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Section: Introductionmentioning

confidence: 99%

Dewatering and Treatment of Septage Using Vertical Flow Constructed Wetlands

Tan

Tang

et al. 2017

Technologies

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“…Since plants require nitrogen to grow, so, they can remove it from the wastewater (26). However, other researchers have proven that nitrification and denitrification are the major mechanisms for nitrogen removal in the wetland system (27,28). To remove nitrogen, wetland ecosystems need a proper functioning of the system and suitable conditions such as temperature and, etc.…”

Section: Discussionmentioning

confidence: 99%

Removal efficiency of nitrate, phosphate, fecal and total coliforms by horizontal subsurface flow-constructed wetland from domestic wastewater

Kalankesh

Rodríguez‐Couto

Shahama

et al. 2019

Environ Health Eng Manag

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Background: Constructed wetlands are systems designed based on the utilization of natural processes, including vegetation, soil, and their associated microbial assemblage to assist in treating different types of wastewater. Methods: Two local Appalachian plants (Louis latifolia and Phragmites australis) were planted into smallscale constructed wetlands to treat domestic wastewater in the North of Iran. The influent wastewater and the effluent from each wetland were sampled daily for 120 days. Experiments were conducted based on the mean ± standard deviation (SD) by analysis of variance (ANOVA). Results: It was found that nitrate, phosphate, fecal and total coliforms were reduced by 84.4%, 94.4%, 96.3%, 93.9% for P. australis and 73.3%, 64.0%, 94.4%, 92.1% for L. latifolia, respectively. Conclusion: According to the results, by using the HF-CW technology with L. latifolia and P. australis plants, the treated wastewater fully meets the wastewater discharge parameters of WHO standards.

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Preliminary investigation on the effect of earthworm and vegetation for sludge treatment in sludge treatment reed beds system

Chen

et al. 2016

Environ Sci Pollut Res

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Sewage sludge treatment is becoming one of the most significant challenges for domestic wastewater management. Optimization of sludge management for reducing sludge handling cost in wastewater treatment plant is highly demanded. Sludge treatment reed bed system (STRB) is an eco-environmentally friendly technology which has a low investment input and reduced costs for operation and maintenance. The objective of this study is to evaluate the effect of earthworm assistant STRB in terms of sludge dewatering and stabilization of surplus sludge. The results show that draining and evapotranspiration (ET) take the main role for sludge dewatering; with maximum of 77 and 43 % water was removed through draining and ET, respectively. Plants improved ET rate up to 13.1 % in the planted STRB compare with the unplanted STRB. The combination of plants and earthworms increased ET rate of 20.9 % more than the control STRB (unplanted without earthworms). The planted STRB with earthworm reached the lowest water content in accumulated sludge of 46 %. There was a systematic increase of total solids (TS) concentration from 0.5 % in the influent to 25-54 % in the accumulated sludge. Earthworms enhanced the sludge stabilization dramatic with the ratio of volatile solids (VS)/TS decreased from 49 % in the influent to 18 % in the accumulated sludge in the earthworm assistant STRB. The results demonstrated a good efficiency for sludge dewatering and stabilization with the assistant of earthworms in STRBs, which can be an alternative technology for sludge treatment in wastewater treatment plants.

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Processes and Mechanisms in Sludge Treatment Wetlands

Cited by 4 publications

References 24 publications

Dewatering and Treatment of Septage Using Vertical Flow Constructed Wetlands

Dewatering and Treatment of Septage Using Vertical Flow Constructed Wetlands

Removal efficiency of nitrate, phosphate, fecal and total coliforms by horizontal subsurface flow-constructed wetland from domestic wastewater

Preliminary investigation on the effect of earthworm and vegetation for sludge treatment in sludge treatment reed beds system

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