Abstract
As the significant residuals in the sewage treatment system, sludge treatment and reuse play a pivotal impact on the environmental sustainability study in China. In this paper, two sewage sludge treatment systems have been investigated, calculated, and analyzed, including the conventional treatment system (Scenario A) and improved reuse system (Scenario B), respectively. The results demonstrate that (1) Compared to Scenario A, Scenario B is a comprehensive system, which integrates a sewage sludge treatment system and a brick production system for sludge recycling. (2) After considering the brick system (scenario B), on the one hand, the sludge treatment capacity has been enhanced and raised sludge utilization; on the other hand, negative influences have also generated due to the non-renewable resources input and several outputs. (3) In Scenario A and Scenario B, the input resources part reflects the main impact (about 59.6% in the entire emergy value). (4) In this new paper, the UEVs are 2.73E + 11sej/kg and 6.29E + 11sej/kg in Scenario A and Scenario B, respectively. (5) The emergy sustainability indexes (ESI) are 0.012292 and 0.00848, which express the weak comprehensive effects in Scenario A and Scenario B. (6) Scenario B has a more extensive range of change than Scenario A because of the more resource input for the sensitivity analysis. Given the all discussions, there are two effective approaches to be used for perfecting environmental sustainability in the Scenario A system and Scenario B system.
Highlights
A mass of sewage discharge was performed in order to satisfy economic development demand in China
There are two effective approaches to be used for perfecting environmental sustainability in the Scenario A system and Scenario B system
Three types of renewable energy were widely used in China, involving solar power, hydropower, and wind power, which can offer mature technical support
Summary
A mass of sewage discharge was performed in order to satisfy economic development demand in China. Lots of sewage sludge will generate after sewage discharge. Several related sludge studies were executed by some researchers on the basis on disparate views. There is only one or insufficient views to explain the sludge reuse process and results, which have inaccurate results. The negative effect will be generated for the sustainability of evaluated system. (4) Be short of a unified platform, consisting of resources, energy, labor, and reuse subsystem. Based on the above five drawbacks, the results of the environmental sustainability evaluation are subject to mistakes for some extent
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