At present, industrial parks in Yangtze River Delta Region are facing multiple restrictions on water resources, water environment, water ecology and carbon emissions. The efficient utilization of water resources in the industrial parks is an important support for the high-quality development of the Yangtze River Delta Region, with the sewage resource utilization as a key way to achieve the goal. Based on the relevant research, practice and policy as well as the combination of the principles of comprehensive planning and systematic optimization, a strategy for the efficient utilization of water resources in the industrial parks was proposed with the five-level treatment and five-level reuse system as the core. Based on the “double carbon” strategy, a new idea for the efficient and low-carbon utilization of water resources in the industrial parks coupled with the sewage reuse, resource recovery, energy conservation and multi-energy complementary was proposed, which could promote the collaborative optimization of water conservation, pollution reduction and carbon reduction. It can also be found that the utilization of water resources in industrial parks in Yangtze River Delta Region should develop towards a low-carbon, regional, integrated and intelligent mode in the future.

Enhancement of the cometabolic biotransformation of 4-chlorophenol (4-cp) and phenol were studied using chemically and thermally granular activated carbons (GACs). It was found that both chemically activated and thermally activated GAC effectively adsorb phenol and 4-cp. More than 80% adsorped substrates were later desorpted, showing a reversible sorption behaviour in the GAC. For each activated carbon type, 4-cp was preferentially adsorbed over phenol and the desorption efficiencies of both phenol and 4-cp were found to increase linearly with the initial mass of adsorbate in the adsorbent. The biodegradation of 500 mg/L phenol by Pseudomonas putida took 24 h while the biodegradation of 4-cp took 32 h. Inhibitions during the cometabolic biodegradation of 4-cp and phenol were alleviated by the addition of the GACs. The system with chemically-activated coconut type GAC had better system stability over thermally-activated peat type GAC. The results show that GAC can be regenerated by the cells enhancement of the cometabolic biotransformation of 4-cp and phenol can be accomplished using chemically-activated coconut type GAC.