Teaching learning-based whale optimization algorithm for multi-layer perceptron neural network training.

This paper presents an improved teaching learning-based whale optimization algorithm (TSWOA) used the simplex method. First of all, the combination of WOA algorithm and teaching learning-based algorithm not only achieves a better balance between exploration and exploitation of WOA, but also makes whales have self-learning ability from the biological background, and greatly enriches the theory of the original WOA algorithm. Secondly, the WOA algorithm adds the simplex method to optimize the current worst unit, averting the agents to search at the boundary, and increasing the convergence accuracy and speed of the algorithm.

An improved spotted hyena optimizer for PID parameters in an AVR system.

In this paper, an improved spotted hyena optimizer (ISHO) with a nonlinear convergence factor is proposed for proportional integral derivative (PID) parameter optimization in an automatic voltage regulator (AVR). In the proposed ISHO, an opposition-based learning strategy is used to initialize the spotted hyena individual's position in the search space, which strengthens the diversity of individuals in the global searching process. A novel nonlinear update equation for the convergence factor is used to enhance the SHO's exploration and exploitation abilities.

Removal of nitrogen, phosphorus, and organic pollutants from water using seeding type immobilized microorganisms.

Objective: To study the possibility of removing nitrogen, phosphorus, and organic pollutants using seeding type immobilized microorganisms.

Methods: Lakes P and M in Wuhan were chosen as the objects to study the removal of nitrogen, phosphorus, and organic pollutants with the seeding type immobilized microorganisms. Correlations between the quantity of heterotrophic bacteria and the total nitrogen (TN), total phosphorus (TP), and total organic carbon (TOC) in the two lakes were studied.

Preparation of seeding type immobilized microorganisms and their degradation characteristics on Di-n-butyl phthalate.

Objective: To study the preparation of seeding type immobilized microorganisms and their degradation characteristics on di-n-butyl phthalate (DBP).

Methods: Diatomite, clinoptilolite, silk zeolite, and coal fly ash were chosen as reserved materials and modified. Their adsorption capacity and intensity in the bacteria were determined and the best carrier was picked out.

Experimental study on denitrification using coated electrode of immobilized denitrifying bacteria.

Objective: To develop a coated electrode of immobilized denitrificants and to evaluate the performance of a bioelectrochemical reactor to enhance and control denitrification.

Methods: Denitrifying bacteria were developed by batch incubation and immobilized with polyvinyl alcohol (PVA) on the surface of activated carbon fiber (ACF) to make a coated electrode. Then the coated electrode (cathode) and graphite electrode (anode) were transferred to the reactor to reduce nitrate.

[Biodegradation of dibutyl phthalate by diatomite adsorptive immobilized microorganism].

Objective: To study the biodegradation characteristics of seeding type immobilized microorganism on dibutyl phthalate (DBP).

Methods: The immobilized microorganism was made to adsorb DBP degradation dominant bacteria by using modified diatomite as carrier, then it degraded DBP under different primary concentration, vibration rate, pH, temperature and at the presence of metal compounds. The degradation kinetics was analyzed.

[Adsorptive properties of various carriers on dibutyl phthalate degradation bacteria].

Objective: Seeking cheap and effective carriers for adsorbing dibutyl phthalate (DBP) degradation dominant bacteria.

Methods: Diatomite, clinoptilolite, silk zeolite and coal fly ash were selected as reserve materials and modified. The adsorptive capacity and intensity of each carrier to DBP degradation bacteria were measured.

Biodegradation characteristics of environmental endocrine disruptor di-n-butyl phthalate.

Objective: The biodegradation characteristics of di-n-butyl phthalate (DBP), an environmental endocrine disruptor, were studied by the method of dominant bacteria and immobilized microorganisms.

Methods: Taking DBP as the only carbon source to acclimatize the collected activated sludge, the concentration of DBP increased progressively in the process of acclimatization. Plate streaking was used to separate 1 strain of the degradation dominant bacteria after acclimatization.

A study on arsenic removal from household drinking water.

Arsenic removal from household drinking water has been receiving considerable attention in the field of water supply engineering. To develop the optimal coagulation protocol, the effectiveness of several operation options such as coagulants, coagulant aids and additives, as well as flocs separation systems were investigated in this study through the use of orthogonal array experiment based on Taguchi method. Arsenic removal mechanism during household coagulation (via manual mixing) was also discussed.

Arsenic removal from household drinking water by adsorption.

Geogenic inorganic arsenic contamination in drinking water has been raising public health concern especially in developing countries. Cost-effective and stopgap arsenic removal method for household use (cooking and drinking) is very urgent. Several iron treated natural materials such as Fe-treated activated carbon (FeAC), Fe-treated gel beads (FeGB) and iron oxide-coated sand (IOCS), were investigated in this study for arsenic removal from dispersed household drinking water supply (scattered wells in the endemic arsenic poisoning areas).